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20080868 Ver 2_2020_Ponar_Tables_I-33_thru_I-94_20210701
Table 1-33. Raw data from benthic ponar grab samples collected in May 2020 at each station in all 15 creeks in the PCS study. Benthic organisms were not counted beyond 100 individuals in any sample. Taxonomic hierarchy Broomfield Creek SCUT1 (control) Jacks Creek Little Creek (control) Jacobs Creek PA2 (control) Drinkwater Creek Long Creek (control) Tooley Creek Muddy Creek (control) Huddles Cut Porter Creek DCUT11 DCUT19 (control) Duck Creek (control) Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Annelida Clitellata Enchytraeidae sp. Naididae Naididae sp. Naididae sp. w/ hair Naididae sp. w/o hair Limnodrilus hoffineisteri Paranais litoralis Tubificoides heterochaetus Polychaeta Ampharetidae Amphicteis floridus Capitellidae Heteromastus filiformis Mediomastus ambiseta Phyllodocida Eteone heteropoda Nereididae Neanthes succinea Laeonereis culveri Spionidae Marenzelleria viridis Polydora cornuta Streblospio benedicti - - - - - - - - - - - - - - - - - - - - - 2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 - - - - - - - - - - - - - - - - - - - - 44 5 69 - - - - - - - - - 2 - 1 - - - - - - 8 - - - - - 3 - - 24 7 5 - - - 1 - - - - 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 3 - - - - - - 2 - - 3 - - - - - - 3 - 1 - 3 - 18 1 9 9 5 1 7 63 10 22 3 4 - - - - - - - 13 1 13 - 1 78 126 - - - - - - - - - 1 - - 2 - - 1 - - 1 - - 55 18 - - - - - 36 - - - 3 - - - 22 - 39 - 19 - 3 - 36 10 21 6 187 2 - 105 - - 399 - - - 3 - 331 - - - 3 4 16 - 19 10 32 - 2 2 28 27 4 5 4 8 6 7 14 13 11 8 11 9 18 - 6 - - - - - - - - - - - 1 - - 1 1 - 1 1 2 22 18 - - - - - - - - - - - - - - - - - - 4 1 2 - 1 - - - - - 3 - - - - - 2 - - - - - - - - 1 - - - - - - - 1 - - 4 - - - - 6 - 2 - - - 9 - 1 - - - - - 2 - 1 1 1 - - - 4 - - - - - - 1 - - - - - 4 6 - - 3 8 - 11 - 26 - 41 7 3 13 1 - 71 12 22 6 21 10 4 5 - 9 41 3 4 4 12 - 54 Arthropoda Insecta Coleoptera Hydrophilidae Berosus sp. Haliplidae Peltodytes sp. Diptera Ceratopogonidae Bezzia/Palpomyia complex Dasyhelea sp. Chironomidae Apedilum sp. Chironomus decorus - - - - - - - - 1 - 2 - 6 - - - - - - - - - - - 12 2 - 3 2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 - - - 2 - 3 - 3 - - 1 2 - - - - - - - 7 - 2 - 35 26 13 9 5 - - - - - - - 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10 - 43 4 - - - - - - - - - - - - - - 2 3 - - - 2 - 3 35 18 - 10 31 3 28 2 36 5 3 - 5 17 - 1 6 - 3 11 31 90 28 6 - 17 1-39 Table 1-33. (continued). Taxonomic hierarchy Broomfield Creek SCUT1 (control) Jacks Creek Little Creek (control) Jacobs Creek PA2 (control) Drinkwater Creek Long Creek (control) Tooley Creek Muddy Creek (control) Huddles Cut Porter Creek DCUT11 DCUT19 (control) Duck Creek (control) Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Coelotanypus sp. Cryptochironomus sp. Dicrotendipes nervosus Endochironomus sp. Goeldichironomus devineyae Glyptotendipes sp. Orthocladiinae sp. Parachironomus sp. Tanypus neopunctipennis Tanytarsus sp. Tabanidae sp. Chrysops sp. Tabanus sp. Hemiptera Corixidae Corixidae sp. Trichocorixa calve Trichocorixa sexcinta Odonata Coenagrionidae Enallagma sp. Libellulidae Perithemis tenera Malacostraca Amphipoda Corophiidae Apocorophium lacustre Apocorophium louisianum Apocorophium sp. Gammaridae Gammarus mucronatus Gammarustigrinus Haustoriidae sp. Lepidactylus dytiscus Talitridae Uhlorchestia uhleri Decapoda Panopeidae Palaemonetes pugio Rhithropanopeus harrisii - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2 - - - - - - - - - 2 - - - - - - - - - - - 97 320 4 6 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 3 - 18 2 1 - - - 1 - - - 2 1 17 14 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6 - - - - - - - 3 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 - 28 1 5 - - 2 2 - - - 1 - - - - - - - 3 1 9 - - - - 2 - 1 - - - 10 - - - - - - - - - - - - - - - - - - - - - - 1 - - - - - 2 1 - - - 2 - - - - - - - - - 4 1 106 218 5 6 - - - - - - - - - - - - - - - - - - - - - - - - - - - 4 - - 2 - - - - - - - - - - - - - - - - - - - - - - - - - 2 - 2 - - - - - - - 12 - - - 14 - 15 5 2 4 - - - - - 1 - - - - - - 2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 - - - - 1 1 - 1 - - - - - - - - - - - - - - - - - - - - - - - - - - 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3 - - - - - - - - - - 5 - 10 3 - - - - 1 - - - - 1 - - - - 2 55 387 - - - 1 - - - - - 11 - 16 - 23 20 - 20 18 22 - - - 7 - - - 78 - - - 15 48 - - - 2 - 2 3 96 - 112 33 162 76 39 46 88 144 - 6 6 58 3 1 - 130 3 236 438 128 344 1 2 - - - - - 6 - 5 2 33 - - - 8 32 1 - - - 1 - - - - - - - - - 1 14 105 222 34 18 223 45 34 24 51 19 21 64 48 123 5 3 2 7 21 - - 172 26 396 500 22 435 28 11 - - - - - - - - - - - - - - - - - - - - - 34 - - - - - - - - - - - - - - - - - - - - - 1 1 - - - - - - - - - - - - - - - - - - - - 2 - - - - - - - - - - - - - - 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2 - - - - - - - - - 1-40 Table 1-33. (concluded). Taxonomic hierarchy Broomfield Creek SCUT1 (control) Jacks Creek Little Creek (control) Jacobs Creek PA2 (control) Drinkwater Creek Long Creek (control) Tooley Creek Muddy Creek (control) Huddles Cut Porter Creek DCUT11 DCUT19 (control) Duck Creek (control) Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Isopoda Anthuridae Cyathura polity Idoteidae Edotia montosa Erichsonella filiformis Sphaeromatidae Cassidinidea lunifrons Mysida Mysidae Americamysis almyra Leptocheliidae Hargeria rapax Ostracoda Candonidae Candonidae sp. Cytherideidae Cyprideis littoralis - - - - - 1 - 1 - 1 - - - 1 - - 1 - - - - 2 - - - 4 - 36 - - - - - - - - - - 2 3 - 5 4 - 1 - - 4 - 2 - 1 - - - - - - - - - - - - - - - - - - - - 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3 - - 6 - - - 2 - - - - - 5 - - - - - - 2 - - 1 2 1 - 2 2 - - - - - - - - - - - - - - - 1 18 - - - 23 3 - - 2 - - - - 2 1 - - 24 500 - - - - - 10 34 1 - - 4 - 8 1 - - - - - - 97 3 - - 22 1 9 - 35 6 20 - - - - 11 11 2 10 4 2 - - - - 1 - - 3 - - 1 2 - 7 6 118 57 12 6 22 7 Mollusca Bivalvia Bivalvia sp. Dreissenidae Mytilopsis leucophaeata Mactridae Mulinia lateralis Rangia cuneata Mytilidae Geukensia demissa Tellinidae Macoma tents Gastropoda Hydrobiidae Littoridinops tenuipes Nemertea sp. Platyhelminthes sp. Total taxa - - - - - - - - - - - 1 - - - - - - - - - - - - - - - - - - 1 6 2 - - - - - - - - - - 1 - - - - - - - - - - - - - 6 - - - - - - - - - - - - - - - 2 - 2 - 1 - 4 - 2 - - - - 1 - - - - - - - - - - - - - - - - - - - - 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8 - - - - - - - - - - - - - - - 3 - - - 3 - 13 1 18 3 3 11 - - 11 - 7 - 3 - 3 - - 1 - 18 29 - 20 8 3 64 40 14 33 8 - 9 7 2 6 3 - 13 13 389 20 83 72 6 5 - - - - - - - - - - - - - - - - - - - - - - - 1 - - - - - 1 - - - - - 1 - 2 - - - - - - - - - - - - - - - - - - - - - - 5 10 7 8 12 19 6 17 21 18 15 18 15 23 19 9 12 16 12 15 17 11 14 17 18 16 20 25 9 15 — = Species not collected at station 1-41 Table 1-34. Taxa collected from benthic ponar grab samples collected in May 2020 in all 15 creeks in the PCS study. Taxa for which EBI was calculated are shown with a * and other are shown with a V. Taxonomic hierarchy Broomfield Creek SCUT1 (control) Jacks Creek Little Creek (control) Jacobs Creek PA2 (control) Drinkwater Creek Long Creek (control) Tooley Creek Muddy Creek (control) Huddles Cut Porter Creek DCUT11 DCUT19 (control) Duck Creek (control) Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Annelida Clitellata Enchytraeidae sp. Naididae Naididae sp. Naididae sp. w/ hair Naididae sp. w/o hair Limnodrilus hoffineisteri Paranais litoralis Tubificoides heterochaetus Polychaeta Ampharetidae Amphicteis floridus Capitellidae Heteromastus filiformis Mediomastus ambiseta Phyllodocida Eteone heteropoda Nereididae Neanthes succinea Laeonereis culveri Spionidae Marenzelleria viridis Polydora cornuta Streblospio benedicti - - - - - - - - - - - - - - - - - - - - - * - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * - - - - - - - - - - - - - - - - - - - - * * * - - - - - - - - - * - * - - - - - - * - - - - - * - - * * * - - - * - - - - * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * * - - - - - - * - - * - - - - - - * - * - * - * * * * * * * * * * * * - - - - - - - * * * - * * * - - - - - - - - - * - - * - - * - - * - - * * - - - - - * - - - * - - - * - * - * - * - * * * * * * - * - - * - - - * - * - - - * * * - * * * - * * * * * * * * * * * * * * * * * - * - - - - - - - - - - - * - - * * - * * * * * - - - - - - - - - - * * * - * - - - - - * - - - - - * - - - - - - * - - - - - - - * - - * - - - - * - * - - - * - * - - - - - * - * * * - - - * - - - - - - * - - - - - * * - - * * - * - * - * * * * * - * * * * * * * * - * * * * * * - * Arthropoda Insecta Coleoptera Hydrophilidae Berosus sp. Haliplidae Peltodytes sp. Diptera Ceratopogonidae Bezzia/Palpomyia complex Dasyhelea sp. Chironomidae Apedilum sp. Chironomus decorus - - - - - - - - * - * - * - - - - - - - - - - - * * - * * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * - - - * - * - * - - * * - - - - - - - * - * - * * * * * - - - - - - - * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * - * * - - - - - - - - - - - - - - * * - - - * - * * * - * * * * * * * * - * * - * * - * * * * * * - * 1-42 Table 1-34. (continued). Taxonomic hierarchy Broomfield Creek SCUT1 (control) Jacks Creek Little Creek (control) Jacobs Creek PA2 (control) Drinkwater Creek Long Creek (control) Tooley Creek Muddy Creek (control) Huddles Cut Porter Creek DCUT11 DCUT19 (control) Duck Creek (control) Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Coelotanypus sp. Cryptochironomus sp. Dicrotendipes nervosus Endochironomus sp. Goeldichironomus devineyae Glyptotendipes sp. Orthocladiinae sp. Parachironomus sp. Tanypus neopunctipennis Tanytarsus sp. Tabanidae sp. Chrysops sp. Tabanus sp. Hemiptera Corixidae Corixidae sp. Trichocorixa calve Trichocorixa sexcinta Odonata Coenagrionidae Enallagma sp. Libellulidae Perithemis tenera Malacostraca Amphipoda Corophiidae Apocorophium lacustre Apocorophium louisianum Apocorophium sp. Gammaridae Gammarus mucronatus Gammarus tigrinus Haustoriidae sp. Lepidactylus dytiscus Talitridae Uhlorchestia uhleri Decapoda Palaemonidae Palaemonetes pugio Rhithropanopeus harrisii * - - * - - - - - - - - - * * * * * - - - - - - - - - - - * * - * * * - - - * - - - * * * * - - - - * - - - - - - - ✓ - - - - - * - * * * - - * * - - - * - - - - - - - * * * - - - - * - * - - - * - * - - - - - * * - - - * - - - - - - - - - * * * * * * - - * - - * - * - * - - - - - - - * - - - * - * * * * - - - - - * - - - - - - * - - - - - - - - * - - - - * * - * - - - - - - - - - - * ✓ - - - - - - - - - - * - * * - - - - * - - - - * - - - - * * * - - - * - - - - - * - * - * * - * * * - - - * - - - * - - - * * - - - * - * * * - * * * * * * * * - * * * * * - * * * * * * * * - - - - - * - * * * - - * * * - - - * - - - - - - - * * * * * * * * * * * * * * * * * * * * * - - * * * * * * * * * - - - - - - - - * - - - - - * * - - - - - - - - - * - - - - - - - - - 1-43 Table 1-34. (concluded). Taxonomic hierarchy Broomfield Creek SCUT1 (control) Jacks Creek Little Creek (control) Jacobs Creek PA2 (control) Drinkwater Creek Long Creek (control) Tooley Creek Muddy Creek (control) Huddles Cut Porter Creek DCUT11 DCUT19 (control) Duck Creek (control) Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up Down Up I Down Isopoda Anthuridae Cyathura polity Idoteidae Edotia montosa Erichsonella filiformis Sphaeromatidae Cassidinidea lunifrons Mysida Mysidae Americamysis almyra Leptocheliidae Hargeria rapax Ostracoda Candonidae Candonidae sp. Cytherideidae Cyprideis littoralis - - - - - * - * - * - - - * - - * - - - - * - - - * - * - - - - - - - - - - * * * - * * - * - - * - * - * - - - - - - - - - - - - - - - - - - - - ✓ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * - - - - - - * - - * - - - * - - - - - * - - - - - - * - - * * * - * * - - - - - - - - - * * - - - * * * - * - - * * - - * * - - - - - ✓ ✓ ✓ - - ✓ - ✓ ✓ - - - - - - ✓ ✓ - - ✓ ✓ ✓ - ✓ ✓ ✓ - - - ✓ ✓ ✓ ✓ ✓ ✓ ✓ - - - - ✓ - - ✓ - - ✓ ✓ - ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ Mollusca Bivalvia Bivalvia sp. Dreissenidae Mytilopsis leucophaeata Mactridae Mulinia lateralis Rangia cuneata Mytilidae Geukensia demissa Tellinidae Macoma tenta Gastropoda Hydrobiidae Littoridinops tenuipes - - - - - - - - - - - ✓ - - - - - - - - - - - - - - - - - - * * * - - - - - - - - - - * - - - - - - - - - - - - - * - - - - - * - * - * - * - - * - - * - - - - - - - - - - - - - - - - - - - - * - - - - - - - - - - - - - - - - - - * - - - - - - - - - - - - - * - - - * - * * * * * * - - * - * - * - * - - * - * * - * * * * * * * * - * * * * * - * * * * * * * * Nemertea sp. - - - - - - - - - - - - - - - - - - - - - - - ✓ - - - - - ✓ Platyhelminthes sp. - - - - - ✓ - ✓ - - - - - - - - - - - - - - - - - - - - - - Total taxa 5 10 7 8 12 19 6 17 21 18 15 18 15 23 19 9 12 16 12 15 17 11 14 17 18 16 20 25 9 15 — = Species not collected at station 1-44 Table 1-35. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Broomfield Creek upstream station in May 2020. Broomfield Creek Upstream Samples Species/taxon 1 2 3 4 5 Average Annelida Clitellata Naididae sp. w/o hair 32 2 1 3 6 8.8 Limnodrilus hoffmeistreri 17 1 3 3 0 4.8 Polychaeta Streblospio benedicti 2 0 0 0 1 0.6 Arthropoda Insecta Diptera Bezzia/Palpomyia complex 1 0 0 0 0 0.2 Malacostraca Amphipoda Gammarus tigrinus 4 1 2 5 2 2.8 Mollusca Veneroida Mytilopsis leucophaeata 0 0 0 0 1 0.2 Total taxa by sample 56 4 6 11 10 Total abundance = 87 Total taxa present = 5 Shannon -Wiener diversity = 1.21 1-45 Table 1-36. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Broomfield Creek upstream station in May 2020. Species/taxona Number of individuals" Sensitivity value (SV)` Abundance value (n) Product of (SV)(n) Annelida Clitellata Naididae sp. w/o hair 44 1.0 30 30.0 Limnodrilus hoffmeistreri 24 1.0 10 10.0 Polychaeta Streblospio benedicti 3 1.1 3 3.3 Arthropoda Insecta Diptera Bezzia/Palpomyia complex 1 2.3 1 2.3 Malacostraca Amphipoda Gammarus tigrinus 14 2.0 10 20.0 Mollusca Veneroida Mytilopsis leucophaeata 1 1.5 1 1.5 Total 55 67.1 Estuarine Biotic Index = 1.22 Total taxa = 5 Total taxa with sensitivity values = 5 a Only those taxa for which a sensitivity value is available are displayed. bTotal number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-46 Table 1-37. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Broomfield Creek downstream station in May 2020. Species/taxon Broomfield Creek Downstream Samples 1 2 3 4 5 Average Annelida Clitellata Naididae sp. w/o hair 0 2 0 2 1 1.0 Limnodrilus hoffmeisteri 2 0 0 3 2 1.4 Polychaeta Amphicteis floridus 0 2 0 1 0 0.6 Mediomastus ambiseta 0 2 0 1 0 0.6 Streblospio benedicti 0 2 0 4 2 1.6 Arthropoda Insecta Diptera Chironomus decorus 0 0 0 2 0 0.4 Tanytarsus sp. 0 0 0 0 1 0.2 Malacostraca Amphipoda Apocorophium sp. 0 2 0 0 0 0.4 Gammarus tigrinus 38 54 4 3 6 21.0 Mysida Americamysis almyra 0 2 0 0 0 0.4 Mollusca Veneroida Mytilopsis leucophaeata 2 4 0 0 0 1.2 Total taxa by sample 42 68 4 14 11 Total abundance = 144 Total taxa present = 10 Shannon -Wiener diversity = 1.16 1-47 Table 1-38. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Broomfield Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)` Abundance value (n) Product of (SV)(n) Annelida Naididae sp. w/o hair 5 1.0 3 3.0 Limnodrilus hoffmeisteri 7 1.0 3 3.0 Polychaeta Amphicteis floridus 3 2.0 3 6.0 Mediomastus ambiseta 3 2.0 3 6.0 Streblospio benedicti 8 1.1 3 3.3 Arthropoda Insecta Diptera Chironomus decorus 2 1.0 1 1.0 Tanytarsus sp. 1 2.3 1 2.3 Malacostraca Amphipoda Apocorophium sp. 2 2.2 1 2.2 Gammarus tigrinus 105 2.0 100 200.0 Mysida Americamysis almyra 2 2.2 1 2.2 Mollusca Veneroida Mytilopsis leucophaeata 6 1.5 3 4.5 Total 122 233.5 Estuarine Biotic Index = 1.91 Total taxa = 10 Total taxa with sensitivity values = 10 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-48 Table 1-39. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the SCUT1 upstream station in May 2020. Species/taxon SCUT1 Upstream Samples 1 2 3 4 5 Average Annelida Clitellata Naididae sp. w/o hair 48 4 2 10 5 13.8 Limnodrilus hoffmeisteri 2 0 0 2 1 1.0 Arthropoda I nsecta Diptera Dicrotendipes nervosus 0 0 0 2 0 0.4 Tanypus neopunctipennis 2 0 0 0 0 0.4 Malacostraca Amphipoda Gammarus tigrinus 100 10 36 56 20 44.4 Ostracoda Podocopida Cyprideis littoralis 30 0 1 0 0 6.2 Mollusca Bivalvia Mytilopsis leucophaeata 0 0 0 2 0 0.4 Gastropoda Littoridinops tenuipes 0 0 1 0 0 0.2 Total taxa by sample 134 10 38 62 21 Total abundance = 334 Total taxa present = 7 Shannon -Wiener diversity = 0.99 1-49 Table 1-40. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the SCUT1 upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Naididae sp. w/o hair 69 1.0 30 30.0 Limnodrilus hoffmeisteri 5 1.0 3 3.0 Arthropoda Insecta Diptera Dicrotendipes nervosus 2 1.0 1 1.0 Tanypus neopunctipennis 2 1.0 1 1.0 Malacostraca Amphipoda Gammarus tigrinus 222 2.0 100 200.0 Mollusca Bivalvia Mytilopsis leucophaeata 2 1.5 1 1.5 Gastropoda Littoridinops tenuipes 1 2.0 1 2.0 Total 137 238.5 Estuarine Biotic Index = 1.74 Total taxa present= 7 Total taxa with sensitivity values = 6 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-50 Table 1-41. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the SCUT1 downstream station in May 2020. Species/taxon SCUT1 Downstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis floridus 4 7 2 4 1 3.6 Eteone heteropoda 0 0 1 1 1 0.6 Streblospio benedicti 2 5 1 3 0 2.2 Arthropoda Insecta Diptera Chironomus decorus 1 1 0 1 0 0.6 Malacostraca Amphipoda Apocorophium sp. 0 1 0 1 0 0.4 Gammarus tigrinus 0 3 10 11 10 6.8 Ostracoda Podocopida Candonidae sp. 3 0 4 0 3 2.0 Cyprideis littoralis 1 6 3 1 0 2.2 Total taxa by sample 11 23 21 22 15 Total abundance = 92 Total taxa present = 8 Shannon -Wiener diversity = 1.74 1-51 Table 1-42. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the SCUT1 downstream station in Ma v 2020. Species/taxona Number of individuals" Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 18 2.0 10 20.0 Eteone heteropoda 3 1.6 3 4.8 Streblospio benedicti 11 1.1 10 11.0 Arthropoda Insecta Diptera Chironomus decorus 3 1.0 3 3.0 Malacostraca Amphipoda Apocorophium sp. 2 2.2 1 2.2 Gammarus tigrinus 34 2.0 30 60.0 Total 57 101.0 Estuarine Biotic Index = 1.77 Total taxa = 8 Total taxa with sensitivity values = 6 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-52 Table 1-43. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Jacks Creek upstream station in May 2020. Jacks Creek Upstream Samples Species/taxon 1 2 3 4 5 Average Annelida Polychaeta Amphicteis floridus 0 0 0 1 0 0.2 Eteone heteropoda 2 0 1 1 0 0.8 Arthropoda Insecta Diptera Bezzia/Palpomyia complex 0 0 1 1 0 0.4 Chironomus decorus 8 7 4 10 6 7.0 Orthocladiinae 1 1 1 0 0 0.6 Tanypus neopunctipennis 1 0 0 0 0 0.2 Hemiptera Corixidae sp. 8 0 1 2 1 2.4 Malacostraca Amphipoda Apocorophium sp. 2 1 0 0 0 0.6 Gammarus tigrinus 6 0 6 5 1 3.6 Ostracoda Podocopida Candonidae sp. 2 8 1 20 3 6.8 Cyprideis littoralis 5 1 1 2 2 2.2 Mollusca Gastropoda Littoridinops tenuipes 8 2 6 0 2 3.6 Total taxa by sample 43 20 22 42 15 Total abundance = 142 Total taxa present = 12 Shannon -Wiener diversity = 1.99 1-53 Table 1-44. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacks Creek upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 1 2.0 1 2.0 Eteone heteropoda 4 1.6 3 4.8 Arthropoda 1 nsecta Di pte ra Bezzia/Palpomyia complex 2 2.3 1 2.3 Chironomus decorus 35 1.0 30 30.0 Tanypus neopunctipennis 1 1.0 1 1.0 Hemiptera Corixidae sp. 12 1.3 10 13.0 Malacostraca Amphipoda Apocorophium sp. 3 2.2 3 6.6 Gammarus tigrinus 18 2.0 10 20.0 Mollusca Gastropoda Littoridinops tenuipes 18 2.0 10 20.0 Total 69 99.7 Estuarine Biotic Index = 1.44 Total taxa = 12 Total taxa with sensitivity values = 9 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-54 Table 1-45. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Jacks Creek downstream station in May 2020. Species/taxon Jacks Creek Downstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis tloridus 1 3 3 1 1 1.8 Eteone heteropoda 6 3 2 0 5 3.2 Marenzelleria viridis 1 0 0 0 0 0.2 Mediomastus ambiseta 4 2 5 9 2 4.4 Polydora cornuta 1 0 0 1 0 0.4 Streblospio benedicti 3 2 2 10 9 5.2 Arthropoda Insecta D i pte ra Chironomus decorus 6 3 6 0 3 3.6 Parachironomus sp. 0 1 0 0 0 0.2 Decapoda Palaemonetes pugio 0 0 0 0 2 0.4 Hemiptera Trichocorixa sexcinta 0 1 0 0 0 0.2 Isopoda Cyathura polita 0 0 0 1 0 0.2 Malacostraca Amphipoda Apocorophium sp. 17 41 16 11 11 19.2 Apocorophium lacustre 5 0 0 0 0 1.0 Apocorophium louisianum 10 1 0 0 0 2.2 Gammarus mucronatus 1 1 0 4 0 1.2 Gammarus tigrinus 81 62 38 20 22 44.6 Ostracoda Podocopida Candonidae sp. 0 0 1 0 0 0.2 Cyprideis littoralis 0 2 0 0 0 0.4 Mollusca Gastropoda Littoridinops tenuipes 8 6 4 8 3 5.8 Platyhelminthes sp. 1 0 0 0 0 0.2 Total taxa by sample 145 128 77 65 58 Total abundance = 473 Total taxa present = 19 Shannon -Wiener diversity = 1.80 1-55 Table 1-46. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacks Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 9 2.0 1 2.0 Eteone heteropoda 16 1.6 10 16.0 Marenzelleria viridis 1 2.6 1 2.6 Mediomastus ambiseta 22 2.6 10 26.0 Polydora cornuta 2 1.2 1 1.2 Streblospio benedicti 26 1.1 10 11.0 Arthropoda Insecta Diptera Chironomus decorus 18 1.0 10 10.0 Parachironomus sp. 1 1.1 1 1.1 Decapoda Palaemonetes pugio 2 2.5 1 2.5 Hemiptera Trichocorixa sexcinta 1 1.0 1 1.0 Isopoda Cyathura polita 1 2.0 1 2.0 Malacostraca Amphipoda Apocorophium sp. 96 2.2 30 66.0 Apocorophium /acustre 5 2.2 3 6.6 Apocorophium louisianum 11 2.2 10 22.0 Gammarus mucronatus 6 2.3 3 6.9 Gammarus tigrinus 223 2.0 100 200.0 Mollusca Gastropoda Littoridinops tenuipes 29 2.0 10 20.0 Total 203 396.9 Estuarine Biotic Index = 1.93 Total taxa = 19 Total taxa with sensitivity values =16 a Only those taxa for which a sensitivity value is available are displayed. bTotal number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-56 Table 1-47. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Little Creek upstream station in May 2020. Species/taxon Little Creek Upstream Samples 1 2 3 4 5 Average Annelida Clitellata Limnodrilus hoffmeisteri 0 0 0 0 1 0.2 Polychaeta Amphicteis floridus 0 0 4 3 2 1.8 Arthropoda Insecta Diptera Bezzia/Palpomyia complex 0 0 2 1 0 0.6 Dasyhelea sp. 0 0 0 0 1 0.2 Malacostraca Amphipoda Gammarus tigrinus 14 6 4 3 18 9.0 Ostracoda Podocopida Cyprideis littoralis 4 6 0 0 0 2.0 Total taxa by sample 18 12 10 7 22 Total abundance = 69 Total taxa present = 6 Shannon -Wiener diversity = 1.08 1-57 Table 1-48. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Little Creek upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Limnodrilus hoffmeisteri 1 1.0 1 1.0 Polychaeta Amphicteis floridus 9 2.0 3 6.0 Arthropoda Insecta Diptera Bezzia/Palpomyia complex 3 2.3 3 6.9 Malacostraca Amphipoda Gammarus tigrinus 45 2.0 30 60.0 Total 37 73.9 Estuarine Biotic Index = 2.00 Total taxa = 6 Total taxa with sensitivity values = 4 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-58 Table 1-49. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Little Creek downstream station in May of 2020. Species/taxon Little Creek Downstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis floridus 1 0 0 3 1 1.0 Eteone heteropoda 4 3 7 2 3 3.8 Mediomastus ambiseta 2 6 15 5 11 7.8 Polydora cornuta 0 0 0 1 0 0.2 Streblospio benedicti 7 3 16 5 10 8.2 Arthropoda I nsecta Diptera Chironomus decorus 2 0 0 4 4 2.0 Parachironomus sp. 6 2 2 15 3 5.6 Tanytarsus sp. 2 0 0 0 0 0.4 Isopoda Cyathura polita 0 0 0 1 0 0.2 Malacostraca Am phipoda Apocorophium lacustre 0 6 0 4 0 2.0 Apocorophium louisianum 1 0 2 12 1 3.2 Apocorophium sp. 20 10 8 63 11 22.4 Gammarus mucronatus 3 0 0 2 0 1.0 Gammarus tigrinus 10 1 0 22 1 6.8 Mysida Americamysis almyra 1 0 0 1 3 1.0 Ostracoda Podocopida Cyprideis littoralis 4 0 0 0 0 0.8 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 11 0 1 7 1 4.0 Platyhelminthes sp. 0 0 0 2 0 0.4 Total taxa by sample 74 31 51 149 49 Total abundance = 354 Total taxa present = 17 Shannon -Wiener diversity = 2.266 1-59 Table 1-50. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Little Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)` Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 5 2.0 3 6.0 Eteone heteropoda 19 1.6 10 16.0 Mediomastus ambiseta 39 2.0 30 60.0 Polydora cornuta 1.0 1.2 1.0 1.2 Streblospio benedicti 41 1.1 30 33.0 Arthropoda I nsecta Diptera Chironomus decorus 10 1.0 10 10.0 Parachironomus sp. 28 1.1 10 11.0 Tanytarsus sp. 2 2.3 1 2.3 Isopoda Cyathura polita 1 2.0 1 2.0 Malacostraca Amphipoda Apocorophium lacustre 10 2.2 10 22.0 Apocorophium louisianum 16 2.2 10 22.0 Apocorophium sp. 112 2.2 100 220.0 Gammarus mucronatus 5 2.3 3 6.9 Gammarus tigrinus 34 2.0 30 60.0 Mysida Americamysis almyra 5 2.2 3 6.6 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 20 2.0 10 20.0 Total 262 499.0 Estuarine Biotic Index = 1.90 Total taxa = 17 Total taxa with sensitivity values = 15 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-60 Table 1-51. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Jacobs Creek upstream station in May 2020. Species/taxon Jacobs Creek Upstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis tloridus 0 0 0 1 0 0.2 Eteone heteropoda 0 2 1 3 4 2.0 Heteromastus filiformis 0 1 0 0 0 0.2 Polydora cornuta 0 0 0 1 0 0.2 Streblospio benedicti 1 6 0 0 0 1.4 Arthropoda Insecta Coleoptera Berosus sp. 0 0 0 0 1 0.2 Diptera Apedilum sp. 0 1 1 0 8 2.0 Bezzia/Palpomyia Complex 1 0 0 2 0 0.6 Chironomus decorus 3 7 4 9 8 6.2 Parachironomus sp. 0 0 0 0 1 0.2 Tanypus neopunctipennis 1 0 0 3 6 2.0 Tanytarsus sp. 0 1 0 0 0 0.2 Hemiptera Corixidae sp. 0 5 0 0 9 2.8 Isopoda Edotia montosa 0 0 0 0 2 0.4 Malacostraca Amphipoda Apocorophium sp. 4 10 0 11 8 6.6 Apocorophium Iacustre 1 0 0 2 0 0.6 Gammarus mucronatus 0 1 0 0 1 0.4 Gammarus tigrinus 7 6 1 3 7 4.8 Mysida Tanaidacea Hargeria rapax 1 0 0 0 0 0.2 Ostracoda Podocopida Candonidae sp. 3 0 1 0 0 0.8 Cyprideis littoralis 0 1 1 0 0 0.4 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 0 2 0 0 6 1.6 Total taxa by sample 22 43 9 35 61 Total abundance = 170 Total taxa present = 21 Shannon -Wiener diversity = 2.48 1-61 Table 1-52. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacobs Creek upstream station in Ma v 2020. Species/taxona Number of individuals" Sensitivity value (SV)` Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 1 2.0 1 2.0 Eteone heteropoda 10 1.6 10 16.0 Heteromastus filiformis 1 1.1 1 1.1 Polydora cornuta 1 1.2 1 1.2 Streblospio benedicti 7 1.1 3 3.3 Arthropoda 1 nsecta Coleoptera Berosus sp. 1 1.5 1 1.5 Diptera Apedilum sp. 10 4.0 10 40.0 Bezzia/Palpomyia Complex 3 2.3 3 6.9 Chironomus decorus 31 1.0 30 30.0 Parachironomus sp. 1 1.1 1 1.1 Tanypus neopunctipennis 10 1.0 10 10.0 Tanytarsus sp. 1 2.3 1 2.3 Hemiptera Corixidae sp. 14 1.3 10 13.0 Isopoda Edotia montosa 2 2.6 1 2.6 Malacostraca Amphipoda Apocorophium sp. 33 2.2 30 66.0 Apocorophium Iacustre 3 2.2 3 6.6 Gammarus mucronatus 2 2.3 1 2.3 Gammarus tigrinus 24 2.0 10 20.0 Mysida Tanaidacea Hargeria rapax 1 1.6 1 1.6 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 8 2 3 6.0 Total 131 233.5 Estuarine Biotic Index = 1.79 Total taxa = 21 Total taxa with sensitivity values = 19 a Only those taxa for which a sensitivity value is available are displayed. bTotal number of individuals caught in all five ponar replicates. 'Sensitivity values provided by NCDWR. 1-62 Table 1-53. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Jacobs Creek downstream station in May 2020. Species/taxon Jacobs Creek Downstream Samples 1 2 3 4 5 Average Annelida Clitellata Naididae sp. w/ hair 0 1 0 0 0 0.2 Tubificoides heterochaetus 0 0 0 0 1 0.2 Polychaeta Amphicteis tloridus 2 0 2 0 3 1.4 Eteone heteropoda 1 4 4 3 20 6.4 Mediomastus ambiseta 0 1 1 1 16 3.8 Polydora cornuta 1 0 0 0 0 0.2 Streblospio benedicti 1 0 0 1 1 0.6 Arthropoda Insecta D i pte ra Chironomus decorus 0 0 2 0 1 0.6 Goeldichironomus devineyae 1 0 0 0 0 0.2 Parachironomus sp. 3 2 0 0 0 1.0 Isopoda Cyathura polita 0 0 0 1 0 0.2 Edotia montosa 1 0 0 1 1 0.6 Malacostraca Amphipoda Apocorophium sp. 55 28 4 55 20 32.4 Apocorophium louisianum 10 1 1 5 6 4.6 Gammarus mucronatus 7 4 2 10 10 6.6 Gammarus tigrinus 21 5 4 11 10 10.2 Tanaidacea Hargeria rapax 9 6 0 2 1 3.6 Mollusca Bivalvia Mytiloida Macoma tenta 0 2 0 1 0 0.6 Gastropoda Neotaenioglossa Littoridinops tenuipes 1 0 0 0 2 0.6 Total taxa by sample 113 53 20 91 92 Total abundance = 370 Total taxa present = 18 Shannon -Wiener diversity = 1.88 1-63 Table 1-54. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacobs Creek downstream station in May 2020. Species/taxona Number of individuals" Sensitivity value (SV)` Abundance value (n) Product of (SV)(n) Annelida Clitellata Naididae sp. w/ hair 1 1.0 1 1.0 Tubificoides heterochaetus 1 1.1 1 1.1 Polychaeta Amphicteis floridus 7 2.0 3 6.0 Eteone heteropoda 32 1.6 30 48.0 Mediomastus ambiseta 19 2.0 10 20.0 Polydora cornuta 1 1.2 1 1.2 Streblospio benedicti 3 1.1 3 3.3 Arthropoda Insecta Diptera Chironomus decorus 3 1.0 3 3.0 Goeldichironomus devineyae 1 2.0 1 2.0 Parachironomus sp. 5 1.1 3 3.3 Isopoda Cyathura polita 1 2.0 1 2.0 Edotia montosa 3 2.6 3 7.8 Malacostraca Amphipoda Apocorophium sp. 162 2.2 100 220.0 Apocorophium louisianum 23 2.2 10 22.0 Gammarus mucronatus 33 2.3 30 69.0 Gammarus tigrinus 51 2.0 30 60.0 Tanaidacea Hargeria rapax 18 1.6 10 16.0 Mollusca Bivalvia Mytiloida Macoma tenta 3 2.0 3 6.0 Gastropoda Neotaenioglossa Littoridinops tenuipes 3 2.0 3 6.0 Total 246 497.7 Estuarine Biotic Index = 2.02 Total taxa = 18 Total taxa with sensitivity values = 18 a Only those taxa for which a sensitivity value is available are displayed. bTotal number of individuals caught in all five ponar replicates. 'Sensitivity values provided by NCDWR. 1-64 Table 1-55. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the PA2 upstream station in May 2020. Species/taxon PA2 Creek Upstream Samples 1 2 3 4 5 Average Annelida Clitellata Tubificoides heterochaetus 0 2 0 1 0 0.6 Polychaeta Amphicteis floridus 10 14 16 11 12 12.6 Laeonereis culveri 0 4 0 0 0 0.8 Streblospio benedicti 0 11 1 0 1 2.6 Arthropoda Insecta Coleoptera Berosus sp. 0 1 1 0 0 0.4 Diptera Apedilum sp. 21 13 1 1 7 8.6 Chironomus decorus 0 21 2 1 4 5.6 Goeldichironomus devineyae 1 0 2 0 0 0.6 Hemiptera Corixidae sp. 3 0 6 6 0 3.0 Trichocorixa sexcinta 0 0 1 0 0 0.2 Odanata Enallagma sp. 1 0 0 0 0 0.2 Malacostraca Amphipoda Apocorophium louisianum 3 0 3 1 13 4.0 Apocorophium sp. 17 11 12 5 31 15.2 Gammarus tigrinus 4 0 3 3 9 3.8 Ostracoda Podocopida Candonidae sp. 1 1 2 0 4 1.6 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 19 10 14 13 8 12.8 Total taxa by sample 80 88 64 42 89 Total abundance = 363 Total taxa present = 15 Shannon -Wiener diversity = 2.17 1-65 Table 1-56. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the PA2 upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Tubificoides heterochaetus 3 1.1 3 3.3 Polychaeta Amphicteis floridus 63 2.0 30 60.0 Laeonereis culveri 4 1.0 3 3.0 Streblospio benedicti 13 1.1 10 11.0 Arthropoda Insecta Coleoptera Berosus sp. 2 1.5 1 1.5 Diptera Apedilum sp. 43 4.0 30 120.0 Chironomus decorus 28 1.0 10 10.0 Goeldichironomus devineyae 3 2.0 3 6.0 Hemiptera Corixidae sp. 15 1.3 10 13.0 Trichocorixa sexcinta 1 1 1 1.0 Odanata Enallagma sp. 1 1.5 1 1.5 Malacostraca Amphipoda Apocorophium louisianum 20 2.2 10 22.0 Apocorophium sp. 76 2.2 30 66.0 Gammarus tigrinus 19 2.0 10 20.0 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 64 2.0 30 60.0 Total 182 398.3 Estuarine Biotic Index = 2.19 Total taxa = 15 Total taxa with sensitivity values = 14 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-66 Table 1-57. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the PA2 downstream station in May 2020. PA2 Creek Downstream Samples Species/taxon 1 2 3 4 5 Average Annelida Clitellata Limnodrilus hoffmeisteri 0 0 1 0 0 0.2 Polychaeta Amphicteis floridus 5 2 3 0 0 2.0 Eteone heteropoda 2 0 0 0 0 0.4 Heteromastus filiformis 0 0 1 1 0 0.4 Laeonereis culveri 0 0 1 0 0 0.2 Mediomastus ambiseta 1 0 1 1 0 0.6 Neanthes succinea 0 0 1 0 0 0.2 Streblospio benedecti 0 0 1 0 0 0.2 Arthropoda Insecta Diptera Apedilum sp. 2 0 1 0 1 0.8 Bezzia/Palpomyia complex 0 1 0 0 0 0.2 Chironomus decorus 0 0 0 1 1 0.4 Hemiptera sp. Corixidae sp. 1 0 1 2 1 1.0 Trichocorixa sexcinta 0 0 1 0 0 0.2 Isopoda Edotia montosa 0 0 1 0 0 0.2 Malacostraca Amphipoda Apocorophium sp. 26 5 1 0 7 7.8 Gammarus tigrinus 7 3 3 0 8 4.2 Ostracoda Podocopida Candonidae sp. 1 0 0 0 0 0.2 Mollusca Bivalvia sp. 0 0 1 0 0 0.2 Gastropoda Neotaenioglossa Littoridinops tenuipes 7 4 19 2 8 8.0 Total taxa by sample 52 15 37 7 26 Total abundance = 137 Total taxa present = 18 Shannon -Wiener diversity = 1.95 1-67 Table 1-58. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the PA2 downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Limnodrilus hoffmeisteri 1 1.0 1 1.0 Polychaeta Amphicteis floridus 10 2.0 10 20.0 Eteone heteropoda 2 1.6 1 1.6 Heteromastus filiformis 2 1.1 1 1.1 Laeonereis culveri 1 1.0 1 1.0 Mediomastus ambiseta 3 2.0 3 6.0 Neanthes succinea 1 1.7 1 1.7 Streblospio benedecti 1 1.1 1 1.1 Arthropoda Insecta Diptera Apedilum sp. 4 4.0 3 12.0 Bezzia/Palpomyia complex 1 2.3 1 2.3 Chironomus decorus 2 1.0 1 1.0 Hemiptera Corixidae sp. 5 1.3 3 3.9 Trichocorixa sexcinta 1 1.0 1 1.0 Isopoda Edotia montosa 1 2.6 1 2.6 Malacostraca Amphipoda Apocorophium sp. 39 2.2 30 66.0 Gammarus tigrinus 21 2.0 10 20.0 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 40 2.0 30 60.0 Total 99 202.3 Estuarine Biotic Index = 2.04 Total taxa = 18 Total taxa with sensitivity values = 16 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-68 Table 1-59. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Drinkwater Creek upstream station in May 2020. Species/taxon Drinkwater Creek Upstream Samples 1 2 3 4 5 Average Annelida Clitellata Naididae sp. w/o hair 2 0 0 0 0 0.4 Polychaeta Amphicteis floridus 4 0 8 2 8 4.4 Eteone heteropoda 2 0 0 0 0 0.4 Laeonereis culveri 0 2 0 0 0 0.4 Arthropoda Insecta Coleoptera Berosus sp. 2 0 0 2 2 1.2 Diptera Bezzia/Palpomyia Complex 0 0 0 0 2 0.4 Chironomus decorus 6 4 8 8 10 7.2 Dicrotendipes nervosus 0 0 0 2 0 0.4 Goeldichironomus devineyae 0 2 4 10 2 3.6 Parachironomus sp. 2 0 0 0 0 0.4 Tanytarsus sp. 0 0 0 2 0 0.4 Hemiptera Corixidae sp. 0 0 0 0 2 0.4 Malacostraca Amphipoda Apocorophium sp. 6 0 18 16 6 9.2 Apocorophium Iouisianum 0 0 2 14 4 4.0 Gammarus tigrinus 16 2 12 24 10 12.8 Gastropoda Neotaenioglossa Littoridinops tenuipes 4 0 4 0 6 2.8 Total taxa by sample 42 10 56 80 52 Total abundance = 242 Total taxa present = 15 Shannon -Wiener diversity = 2.14 1-69 Table 1-60. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Drinkwater Creek upstream station in May 2020. Species/taxona Number of individuals" Sensitivity value (SV)` Abundance value (n) Product of (SV)(n) Annelida Clitellata Naididae sp. w/o hair 2 1.0 1 1.0 Polychaeta Amphicteis floridus 22 2.0 10 20.0 Eteone heteropoda 2 1.6 1 1.6 Laeonereis culveri 2 1.0 1 1.0 Arthropoda Insecta Coleoptera Berosus sp. 6 1.5 3 4.5 Diptera Bezzia/Palpomyia Complex 2 2.3 1 2.3 Chironomus decorus 36 1.0 30 30.0 Dicrotendipes nervosus 2 1.0 1 1.0 Goeldichironomus devineyae 18 2.0 10 20.0 Parachironomus sp. 2 1.1 1 1.1 Tanytarsus sp. 2 2.3 1 2.3 Hemiptera Corixidae sp. 2 1.3 1 1.3 Malacostraca Amphipoda Apocorophium sp. 46 2.2 30 66.0 Apocorophium Iouisianum 20 2.2 10 22.0 Gammarus tigrinus 64 2.0 30 60.0 Gastropoda Neotaenioglossa Littoridinops tenuipes 14 2.0 10 20.0 Total 141 254.1 Estuarine Biotic Index = 1.80 Total taxa = 15 Total taxa with sensitivity values = 15 a Only those taxa for which a sensitivity value is available are displayed. "Total number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-70 Table 1-61. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Drinkwater Creek downstream station in May 2020. Species/taxon Drinkwater Creek Downstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis floridus 0 1 0 1 1 0.6 Eteone heteropoda 1 4 10 5 8 5.6 Mediomastus ambiseta 4 3 0 9 20 7.2 Marenzelleria viridis 0 1 0 0 0 0.2 Polydora cornuta 0 0 1 2 1 0.8 Streblospio benedicti 4 16 22 10 19 14.2 Arthropoda Insecta Diptera Chironomus decorus 1 0 0 0 4 1.0 Goeldichironomus devineyae 0 2 0 0 0 0.4 Parachironomus sp. 0 0 0 0 2 0.4 Hemiptera Corixidae sp. 0 2 2 0 0 0.8 Trichocorixa sexcinta 1 0 0 0 0 0.2 Isopoda Cyathura polita 0 1 0 0 0 0.2 Edotia montosa 1 2 0 1 1 1.0 Malacostraca Amphipoda Apocorophium lacustre 0 0 0 1 0 0.2 Apocorophium louisianum 0 7 0 6 5 3.6 Apocorophium sp. 6 21 11 32 18 17.6 Gammarus mucronatus 0 1 2 3 2 1.6 Gammarus tigrinus 4 13 10 16 5 9.6 Uhlorchestia uhleri 0 1 0 0 0 0.2 Tanaidacea Hargeria rapax 7 5 2 3 6 4.6 Ostracoda Podocopida Cyprideis littoralis 0 1 0 0 0 0.2 Mollusca Bivalvia Veneroida Macoma tenta 0 1 0 1 1 0.6 Mulinia lateralis 0 1 0 0 1 0.4 Mytilopsis leucophaeata 0 0 0 0 1 0.2 Gastropoda Neotaenioglossa Littoridinops tenuipes 3 7 3 16 4 6.6 Total taxa by sample 32 90 63 106 99 Total abundance = 390 Total taxa present = 23 Shannon -Wiener diversity = 2.38 1-71 Table 1-62. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Drinkwater Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 3 2.0 3 6.0 Eteone heteropoda 28 1.6 10 16.0 Mediomastus ambiseta 36 2.0 30 60.0 Marenzelleria viridis 1 2.6 1 2.6 Polydora cornuta 4 1.2 3 3.6 Streblospio benedicti 71 1.1 30 33.0 Arthropoda I nsecta Diptera Chironomus decorus 5 1.0 3 3.0 Goeldichironomus devineyae 2 2.0 1 2.0 Parachironomus sp. 2 1.1 1 1.1 Hemiptera Corixidae sp. 4 1.3 3 3.9 Trichocorixa sexcinta 1 1 1 1.0 Isopoda Cyathura polita 1 2.0 1 2.0 Edotia montosa 5 2.6 3 7.8 Malacostraca Amphipoda Apocorophium lacustre 1 2.2 1 2.2 Apocorophium louisianum 18 2.2 10 22.0 Apocorophium sp. 88 2.2 30 66.0 Gammarus mucronatus 8 2.3 3 6.9 Gammarus tigrinus 48 2.0 30 60.0 Uhlorchestia uhleri 1 2.0 1 2.0 Tanaidacea Hargeria rapax 23 1.6 10 16.0 Mollusca Bivalvia Veneroida Macoma tenta 3 2.0 3 6.0 Mulinia lateralis 2 2.3 1 2.3 Mytilopsis leucophaeata 1 1.5 1 1.5 Gastropoda Neotaenioglossa Littoridinops tenuipes 33 2.0 30 60.0 Total 210 386.9 Estuarine Biotic Index = 1.84 Total taxa = 23 Total taxa with sensitivity values = 22 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-72 Table 1-63. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Long Creek upstream station in May 2020. Species/taxon Long Creek Upstream Samples 1 2 3 4 5 Average Annelida Clitellata Naididae sp. w/o hair 1 0 0 0 0 0.2 Polychaeta Amphicteis floridus 0 0 1 1 2 0.8 Eteone heteropoda 2 4 11 7 3 5.4 Heteromastus filiformis 0 0 0 0 1 0.2 Laeonereis culvert 0 0 1 0 0 0.2 Mediomastus ambiseta 0 6 3 0 1 2.0 Neanthes succinea 0 1 0 0 0 0.2 Streblospio benedicti 0 3 3 1 5 2.4 Arthropoda I nsecta Diptera Chironomus decorus 0 0 3 0 0 0.6 Goeldichironomus devineyae 1 0 0 0 0 0.2 Isopoda Edotia montosa 0 1 0 1 2 0.8 Erichsonella filiformis 0 0 0 1 0 0.2 Malacostraca Mysida Americamysis almyra 0 0 1 0 1 0.4 Tanaidacea Hargeria rapax 0 0 2 0 1 0.6 Malacostraca Amphipoda Apocorophium louisianum 1 1 9 4 7 4.4 Apocorophium sp. 2 2 55 34 51 28.8 Gammarus mucronatus 0 1 22 4 5 6.4 Gammarus tigrinus 6 4 64 20 29 24.6 Uhlorchestia uhleri 0 0 1 0 0 0.2 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 0 1 6 0 1 1.6 Total taxa by sample 12 24 182 73 109 Total abundance = 401 Total taxa present = 19 Shannon -Wiener diversity = 1.84 1-73 Table 1-64. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Long Creek upstream station in Ma v 2020. Species/taxona Number of individuals" Sensitivity value (SV)° Abundance value (n) Product of (SV)(n) Annelida Clitellata Naididae sp. w/o hair 1 1.0 1 1.0 Polychaeta Amphicteis floridus 4 2.0 3 6.0 Eteone heteropoda 27 1.6 10 16.0 Heteromastus filiformis 1 1.1 1 1.1 Laeonereis culvert 1 1.0 1 1.0 Mediomastus ambiseta 10 2.0 10 20.0 Neanthes succinea 1 1.7 1 1.7 Streblospio benedicti 12 1.1 10 11.0 Arthropoda Insecta Diptera Chironomus decorus 3 1.0 3 3.0 Goeldichironomus devineyae 1 2.0 1 2.0 Isopoda Edotia montosa 4 2.6 3 7.8 Malacostraca Mysida Americamysis almyra 2 2.2 1 2.2 Tanaidacea Hargeria rapax 3 1.6 3 4.8 Malacostraca Amphipoda Apocorophium louisianum 22 2.2 10 22.0 Apocorophium sp. 144 2.2 100 220.0 Gammarus mucronatus 32 2.3 30 69.0 Gammarus tigrinus 123 2.0 100 200.0 Uhlorchestia uhleri 1 2.0 1 2.0 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 8 2.0 3 6.0 Total 292 596.6 Estuarine Biotic Index = 2.04 Total taxa = 19 Total taxa with sensitivity values = 18 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-74 Table 1-65. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Long Creek downstream station in May 2020. Species/taxon Long Creek Downstream Samples 1 2 3 4 5 Average Annelida Polychaeta Eteone heteropoda 1 1 0 1 1 0.8 Mediomastus ambiseta 7 0 2 12 0 4.2 Neanthes succinea 0 0 1 0 0 0.2 Streblospio benedicti 11 0 3 7 1 4.4 Arthropoda Malacostraca Amphipoda Gammarus mucronatus 0 0 0 0 1 0.2 Gammarus tigrinus 0 0 0 2 3 1.0 Tanaidacea Hargeria rapax 0 0 0 1 0 0.2 Mollusca Bivalvia Veneroida Macoma tenta 4 1 3 4 1 2.6 Mulinea lateralis 1 1 0 0 0 0.4 Total taxa by sample 24 3 9 27 7 Total abundance = 70 Total taxa present = 9 Shannon -Wiener diversity = 1.74 1-75 Table 1-66. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Long Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Eteone heteropoda 4 1.6 3 4.8 Mediomastus ambiseta 21 2.0 10 20.0 Neanthes succinea 1 1.7 1 1.7 Streblospio benedicti 22 1.1 10 11.0 Arthropoda Malacostraca Amphipoda Gammarus mucronatus 1 2.3 1 2.3 Gammarus tigrinus 5 2.0 3 6.0 Tanaidacea Hargeria rapax 1 1.6 1 1.6 Mollusca Bivalvia Veneroida Macoma tenta 13 2.0 10 20.0 Mulinea lateralis 2 2.3 1 2.3 Total 40 69.7 Estuarine Biotic Index = 1.74 Total taxa = 9 Total taxa with sensitivity values = 9 a Only those taxa for which a Sensitivity value is available are displayed. bTotal number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-76 Table 1-67. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Tooley Creek upstream station in May 2020. Tooley Creek Upstream Samples Species/taxon 1 2 3 4 5 Average Annelida Polychaeta Eteone heteropoda 1 0 0 2 2 1.0 Marenzelleria viridis 2 0 1 0 1 0.8 Mediomastus ambiseta 3 0 0 0 3 1.2 Streblospio benedicti 2 2 0 0 2 1.2 Arthropoda I nsecta Diptera Chironomus decorus 0 1 1 3 0 1.0 Malacostraca Amphipoda Apocorophium sp. 2 1 0 2 1 1.2 Gammarus tigrinus 0 1 0 1 1 0.6 Isopoda Cyathura polita 0 1 0 0 0 0.2 Edotia montosa 0 1 0 0 0 0.2 Ostracoda Podocopida Cyprideis littoralis 1 1 0 1 0 0.6 Mollusca Bivalvia Veneroida Macoma tenta 0 1 0 0 0 0.2 Gastropoda Neotaenioglossa Littoridinops tenuipes 1 3 2 1 2 1.8 Total taxa by sample 12 12 4 10 12 Total abundance = 50 Total taxa present = 12 Shannon -Wiener diversity = 2.31 1-77 Table 1-68. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Tooley Creek upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Eteone heteropoda 5 1.6 3 4.8 Marenzelleria viridis 4 2.6 3 7.8 Mediomastus ambiseta 6 2.0 3 6.0 Streblospio benedicti 6 1.1 3 3.3 Arthropoda I nsecta Di pte ra Chironomus decorus 5 1.0 3 3.0 Malacostraca Amphipoda Apocorophium sp. 6 2.2 3 6.6 Gammarus tigrinus 3 2.0 3 6.0 Isopoda Cyathura polita 1 2.0 1 2.0 Edotia montosa 1 2.6 1 2.6 Mollusca Bivalvia Veneroida Macoma tenta 1 2.0 1 2.0 Gastropoda Neotaenioglossa Littoridinops tenuipes 9 2.0 3 6.0 Total 27 50.1 Estuarine Biotic Index = 1.86 Total taxa = 12 Total taxa with sensitivity values = 11 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-78 Table 1-69. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Tooley Creek downstream station in May 2020. Species/taxon Tooley Creek Downstream Samples 1 2 3 4 5 Average Annelida Clitellata Tubificoides heterochaetus 0 0 0 0 2 0.4 Polychaeta Eteone heteropoda 1 1 0 2 0 0.8 Heteromastus filiformis 0 1 0 0 0 0.2 Mediomastus ambiseta 3 100 18 27 39 37.4 Neanthes succinea 0 0 1 0 0 0.2 Streblospio benedicti 3 3 7 3 5 4.2 Arthropoda Insecta Diptera Chironomus decorus 2 2 6 5 2 3.4 Parachironomus sp. 1 0 0 0 0 0.2 Malacostraca Amphipoda Apocorophium sp. 1 4 1 0 0 1.2 Gammarus tigrinus 0 2 0 0 0 0.4 Mysida Americamysis almyra 0 1 0 0 0 0.2 Tanaidacea Hargeria rapax 0 2 0 0 0 0.4 Mollusca Bivalvia Veneroida Macoma tenta 14 1 0 2 1 3.6 Mulinia lateralis 0 1 0 0 0 0.2 Gastropoda Neotaenioglossa Littoridinops tenuipes 0 5 2 0 0 1.4 Nemertea sp. 0 1 0 0 0 0.2 Total taxa by sample 25 124 35 39 49 Total abundance = 272 Total taxa present = 16 Shannon -Wiener diversity = 1.28 1-79 Table 1-70. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Tooley Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Tubificoides heterochaetus 2 1.1 1 1.1 Polychaeta Eteone heteropoda 4 1.6 3 4.8 Heteromastus filiformis 1 1.1 1 1.1 Mediomastus ambiseta 187 2.0 100 200.0 Neanthes succinea 1 1.7 1 1.7 Streblospio benedicti 21 1.1 10 11.0 Arthropoda Insecta Diptera Chironomus decorus 17 1.0 10 10.0 Parachironomus sp. 1 1.1 1 1.1 Malacostraca Amphipoda Apocorophium sp. 6 2.2 3 6.6 Gammarus tigrinus 2 2.0 1 2.0 Mysida Americamysis almyra 1 2.2 1 2.2 Tanaidacea Hargeria rapax 2 1.6 1 1.6 Mollusca Bivalvia Veneroida Macoma tenta 18 2.0 10 20.0 Mulinia lateralis 1 2.3 1 2.3 Gastropoda Neotaenioglossa Littoridinops tenuipes 7 2.0 3 6.0 Total 147 271.5 Estuarine Biotic Index = 1.85 Total taxa = 16 Total taxa with sensitivity values = 15 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-80 Table 1-71. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Muddy Creek upstream station in May 2020. Species/taxon Muddy Creek Upstream Samples 1 2 3 4 5 Average Annelida Eteone heteropoda 0 2 3 2 1 1.6 Mediomastus ambiseta 0 0 0 2 0 0.4 Neanthes succinea 0 0 0 1 0 0.2 Streblospio benedicti 8 0 0 2 0 2.0 Arthropoda Insecta Diptera Goeldichironomus devineyae 1 0 0 0 0 0.2 Malacostraca Amphipoda Apocorophium lacustre 1 0 0 0 0 0.2 Apocorophium louisianum 0 4 3 0 0 1.4 Apocorophium sp. 1 38 7 11 1 11.6 Gammarus tigrinus 0 0 5 0 2 1.4 Mysida Americamysis almyra 2 0 0 0 0 0.4 Ostracoda Podocopida Candonidae sp. 6 24 3 35 29 19.4 Mollusca Bivalvia Veneroida Macoma tenta 0 2 0 0 1 3.0 Gastropoda Neotaenioglossa Littoridinops tenuipes 1 0 0 1 0 0.4 Total taxa by sample 20 70 21 54 34 Total abundance = 199 Total taxa present = 12 Shannon -Wiener diversity = 1.51 1-81 Table 1-72. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Muddy Creek upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Eteone heteropoda 8 1.6 3 4.8 Mediomastus ambiseta 2 2.0 1 2.0 Neanthes succinea 1 1.7 1 1.7 Streblospio benedicti 10 1.1 10 11.0 Arthropoda Insecta Diptera Goeldichironomus devineyae 1 2.0 1 2.0 Malacostraca Amphipoda Apocorophium lacustre 1 2.2 1 2.2 Apocorophium louisianum 7 2.2 3 6.6 Apocorophium sp. 58 2.2 30 66.0 Gammarus tigrinus 7 2.0 3 6.0 Mysida Americamysis almyra 2 2.2 1 2.2 Mollusca Bivalvia Veneroida Macoma tenta 3 2.0 3 6.0 Gastropoda Neotaenioglossa Littoridinops tenuipes 2 2.0 1 2.0 Total 58 112.5 Estuarine Biotic Index = 1.94 Total taxa = 12 Total taxa with sensitivity values = 11 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-82 Table 1-73. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Muddy Creek downstream station in May 2020. Muddy Creek Downstream Samples Species/taxon 1 2 3 4 5 Average Annelida Polychaeta Eteone heteropoda 0 4 0 2 0 1.2 Neanthes succinea 0 0 0 1 1 0.4 Streblospio benedicti 1 2 1 0 0 0.8 Arthropoda Insecta Diptera Chironomus decorus 0 0 1 0 0 0.2 Hemiptera Corixidae sp. 0 1 0 0 0 0.2 Malacostraca Amphipoda Apocorophium sp. 2 1 0 0 0 0.6 Gammarus mucronatus 0 0 0 1 0 0.2 Gammarus tigrinus 3 4 3 11 0 4.2 Isopoda Edotia montosa 0 2 2 0 0 0.8 Mysida Americamysis almyra 0 0 0 1 0 0.2 Ostracoda Podocopida Candonidae sp. 0 1 0 0 2 0.6 Cyprideis littoralis 0 1 0 0 0 0.2 Mollusca Bivalvia Veneroida Macoma tenta 1 0 0 0 2 0.6 Mulinia lateralis 0 2 0 1 1 0.8 Gastropoda Neotaenioglossa Littoridinops tenuipes 0 0 0 3 3 1.2 Total taxa by sample 7 18 7 20 9 Total abundance = 61 Total taxa present = 15 Shannon -Wiener diversity = 2.25 1-83 Table 1-74. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Muddy Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Eteone heteropoda 6 1.6 3 4.8 Neanthes succinea 2 1.7 1 1.7 Streblospio benedicti 4 1.1 3 3.3 Arthropoda Insecta Diptera Chironomus decorus 1 1.0 1 1.0 Hemiptera Corixidae sp. 1 1.3 1 1.3 Malacostraca Amphipoda Apocorophium sp. 3 2.2 3 6.6 Gammarus mucronatus 1 2.3 1 2.3 Gammarus tigrinus 21 2.0 10 20.0 Isopoda Edotia montosa 4 2.6 3 7.8 Mysida Americamysis almyra 1 2.2 1 2.2 Mollusca Bivalvia Veneroida Macoma tenta 3 2.0 3 6.0 Mulinia lateralis 4 2.3 3 6.9 Gastropoda Neotaenioglossa Littoridinops tenuipes 6 2.0 3 6.0 Total 36 69.9 Estuarine Biotic Index = 1.94 Total taxa = 15 Total taxa with sensitivity values = 13 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-84 Table 1-75. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Huddles Cut upstream station in May 2020. Species/taxon Huddles Cut Upstream Samples 1 2 3 4 5 Average Annelida Clitellata Tubificoides heterochaetus 0 1 0 2 0 0.6 Polychaeta Eteone heteropoda 2 1 1 2 1 1.4 Heteromastus filiformis 6 3 11 22 13 11.0 Laeonereis culveri 2 0 0 1 0 0.6 Mediomastus ambiseta 6 26 27 13 33 21.0 Neanthes succinea 8 0 3 5 6 4.4 Polydora cornuta 0 0 1 0 0 0.2 Streblospio benedicti 2 0 0 3 0 1.0 Arthropoda I nsecta Di pte ra Bezzia/Palpomyia Complex 2 0 2 1 2 1.4 Chironomus decorus 2 0 0 2 2 1.2 Malacostraca Amphipoda Apocorophium sp. 0 0 0 1 0 0.2 Decapoda Palaemonetes pugio 0 0 0 1 0 0.2 Rhithropanopeus harrisii 0 0 0 0 2 0.4 Ostracoda Podocopida Cyprideis littoralis 0 1 1 0 0 0.4 Mollusca Bivalvia Veneroida Macoma tenta 2 3 1 3 2 2.2 Rangia cuneata 0 0 0 0 1 0.2 Gastropoda Neotaenioglossa Littoridinops tenuipes 0 1 1 0 1 0.6 Total taxa by sample 32 36 48 56 63 Total abundance = 235 Total taxa present = 17 Shannon -Wiener diversity = 1.79 1-85 Table 1-76. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Huddles Cut upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Tubificoides heterochaetus 3 1.1 3 3.3 Polychaeta Eteone heteropoda 7 1.6 3 4.8 Heteromastus filiformis 55 1.1 30 33.0 Laeonereis culveri 3 1.0 3 3.0 Mediomastus ambiseta 105 2.0 100 200.0 Neanthes succinea 22 1.7 10 17.0 Polydora cornuta 1 1.2 1 1.2 Streblospio benedicti 5 1.1 3 3.3 Arthropoda Insecta Diptera Bezzia/Palpomyia Complex 7 2.3 3 6.9 Chironomus decorus 6 1.0 3 3.0 Malacostraca Amphipoda Apocorophium sp. 1 2.2 1 2.2 Decapoda Palaemonetes pugio 1 2.5 1 2.5 Rhithropanopeus harrisii 2 2.5 1 2.5 Mollusca Bivalvia Veneroida Macoma tenta 11 2.0 10 20.0 Rangia cuneata 1 1.0 1 1.0 Gastropoda Neotaenioglossa Littoridinops tenuipes 3 2.0 3 6.0 Total 176 309.7 Estuarine Biotic Index = 1.76 Total taxa = 17 Total taxa with sensitivity values = 16 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-86 Table 1-77. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Huddles Cut downstream station in May 2020. Huddles Cut Downstream Samples Species/taxon 1 2 3 4 5 Average Annelida Clitellata Enchytraeidae sp. 0 2 0 0 0 0.4 Naididae sp. w/o hair 0 4 2 0 2 1.6 Polychaeta Eteone heteropoda 0 4 0 2 8 2.8 Heteromastus filiformis 0 4 2 10 2 3.6 Marenzelleria viridis 0 0 0 0 6 1.2 Neanthes succinea 0 0 0 2 16 3.6 Arthropoda Malacostraca Amphipoda Lepidactylus dytiscus 6 6 14 8 0 6.8 Isopoda Cyathura polita 2 0 0 0 0 0.4 Edotia montosa 0 2 0 0 0 0.4 Mysida Americamysis almyra 0 2 0 0 0 0.4 Mollusca Bivalvia Mytiloida Geukensia demissa 0 0 0 0 8 1.6 Total taxa by sample 8 24 18 22 42 Total abundance = 114 Total taxa present = 11 Shannon -Wiener diversity = 2.01 1-87 Table 1-78. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Huddles Cut downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Enchytraeidae sp. 2 1.0 1 1.0 Naididae sp. w/o hair 8 1.0 3 3.0 Polychaeta Eteone heteropoda 14 1.6 10 16.0 Heteromastus filiformis 18 1.1 10 11.0 Marenzelleria viridis 6 2.6 3 7.8 Neanthes succinea 18 1.7 10 17.0 Arthropoda Malacostraca Amphipoda Lepidactylus dytiscus 34 3.5 30 105.0 Isopoda Cyathura polity 2 2.0 1 2.0 Edotia montosa 2 2.6 1 2.6 Mysida Americamysis almyra 2 2.2 1 2.2 Mollusca Bivalvia Mytiloida Geukensia demissa 8 3.4 3 10.2 Total 73 177.8 Estuarine Biotic Index = 2.44 Total taxa = 11 Total taxa with sensitivity values = 11 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-88 Table 1-79. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Porter Creek upstream station in May 2020. Species/taxon Porter Creek Upstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis floridus 1 8 0 3 1 2.6 Eteone heteropoda 3 8 1 0 1 2.6 Streblospio benedicti 1 2 0 3 3 1.8 Arthropoda Insecta Diptera Bezzia/Palpomyia Complex 1 0 0 0 1 0.4 Chironomus decorus 2 0 0 1 0 0.6 Goeldichironomus devineyae 0 2 0 0 0 0.4 Tanytarsus sp. 1 2 0 0 1 0.8 Malacostraca Amphipoda Apocorophium louisianum 6 72 0 0 0 15.6 Apocorophium sp. 20 100 5 2 3 26.0 Gammarus tigrinus 46 100 11 11 4 34.4 Mysida Americamysis almyra 2 0 0 0 0 0.4 Tanaidacea Hargeria rapax 0 2 0 0 0 0.4 Ostracoda Podocopida Candonidae sp. 2 0 5 2 13 4.4 Cyprideis littoralis 1 2 0 1 3 1.4 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 3 6 0 0 4 2.6 Total taxa by sample 89 304 22 23 34 Total abundance = 472 Total taxa present = 14 Shannon -Wiener diversity = 1.76 1-89 Table 1-80. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Porter Creek upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 13 2.0 10 20.0 Eteone heteropoda 13 1.6 10 16.0 Streblospio benedicti 9 1.1 3 3.3 Arthropoda Insecta Diptera Bezzia/Palpomyia Complex 2 2.3 1 2.3 Chironomus decorus 3 1.0 3 3.0 Goeldichironomus devineyae 2 2.0 1 2.0 Tanytarsus sp. 4 2.3 3 6.9 Malacostraca Amphipoda Apocorophium louisianum 78 2.2 30 66.0 Apocorophium sp. 130 2.2 100 220.0 Gammarus tigrinus 172 2.0 100 200.0 Mysida Americamysis almyra 2 2.2 1 2.2 Tanaidacea Hargeria rapax 2 1.6 1 1.6 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 13 2.0 10 20.0 Total 273 563.3 Estuarine Biotic Index = 2.06 Total taxa = 14 Total taxa with sensitivity values = 12 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-90 Table 1-81. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Porter Creek downstream station in May 2020. Species/taxon Porter Creek Downstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis floridus 0 0 1 0 0 0.2 Eteone heteropoda 3 4 1 2 1 2.2 Marenzellaria viridis 1 0 0 0 1 0.4 Mediomastus ambiseta 74 94 100 60 71 79.8 Streblospio benedicti 11 8 10 8 4 8.2 Arthropoda I nsecta Di ptera Chironomus decorus 8 2 0 1 0 2.2 Goeldichironomus devineyae 0 0 1 0 0 0.2 Tanytarsus sp. 0 0 0 1 0 0.2 Ma lacostraca Amphipoda Apocorophium lacustre 0 1 1 0 0 0.4 Apocorophium sp. 0 2 0 0 1 0.6 Gammarus tigrinus 13 7 1 1 4 5.2 I sopoda Edotia montosa 1 0 0 0 0 0.2 Tanaidacea Hargeria rapax 0 0 1 0 0 0.2 Ostracoda Podocopida Candonidae sp. 1 0 0 0 0 0.2 Cyprideis littoralis 1 3 2 0 0 1.2 Mollusca Bivalvia Veneroida Macoma tenta 1 2 3 2 3 2.2 Gastropoda Neotaenioglossa Littoridinops tenuipes 3 4 6 0 0 2.6 Nemertea sp. 0 1 0 0 0 0.2 Total taxa by sample 117 128 127 75 85 Total abundance = 532 Total taxa present = 17 Shannon -Wiener diversity = 1.10 1-91 Table 1-82. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Porter Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 1 2.0 1 2.0 Eteone heteropoda 11 1.6 10 16.0 Marenzellaria viridis 2 2.6 1 2.6 Mediomastus ambiseta 399 2.0 100 200.0 Streblospio benedicti 41 1.1 30 33.0 Arthropoda Insecta Diptera Chironomus decorus 11 1.0 10 10.0 Goeldichironomus devineyae 1 2.0 1 2.0 Tanytarsus sp. 1 2.3 1 2.3 Malacostraca Amphipoda Apocorophium lacustre 2 2.2 1 2.2 Apocorophium sp. 3 2.2 3 6.6 Gammarus tigrinus 26 2.0 10 20.0 Isopoda Edotia montosa 1 2.6 1 2.6 Tanaidacea Hargeria rapax 1 1.6 1 1.6 Mollusca Bivalvia Veneroida Macoma tenta 11 2.0 10 20.0 Gastropoda Neotaenioglossa Littoridinops tenuipes 13 2.0 10 20.0 Total 190 340.9 Estuarine Biotic Index = 1.79 Total taxa = 17 Total taxa with sensitivity values = 14 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-92 Table 1-83. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the DCUT11 upstream station in May 2020. Species/taxon DCUT11 Upstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis floridus 6 3 0 4 0 2.6 Eteone heteropoda 3 0 3 2 0 1.6 Streblospio benedicti 0 0 3 0 0 0.6 Arthropoda Insecta Coleoptera Berosus sp. 3 3 3 0 3 2.4 Diptera Bezzia/Palpomyia complex 6 18 3 8 0 7.0 Chironomus decorus 0 6 21 4 0 6.2 Dicrotendipes nervosus 6 18 51 16 6 19.4 Goeldichironomus devineyae 0 0 12 2 3 3.4 Tabanus sp. 0 0 0 2 0 0.4 Tanytarsus sp. 15 27 24 34 6 21.2 Odonata Perithemis tenera 0 0 3 0 0 0.6 Malacostraca Amphipoda Apocorophium lacustre 6 6 36 4 3 11.0 Apocorophium sp. 54 33 100 22 27 47.2 Gammarus tigrinus 100 60 100 36 100 79.2 Isopoda Cassidinidea lunifrons 0 3 0 0 0 0.6 Ostracoda Podocopida Candonidae sp. 6 3 0 0 0 1.8 Cyprideis littoralis 24 24 24 34 12 23.6 Mollusca Bivalvia Veneroida Mulinia lateralis 0 0 0 2 0 0.4 Gastropoda Neotaenioglossa Littoridinops tenuipes 100 100 100 74 15 77.8 Total taxa by sample 329 304 483 244 175 Total abundance =1535 Total taxa present = 18 Shannon -Wiener diversity = 2.07 1-93 Table 1-84. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT11 upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 13 2.0 10 20.0 Eteone heteropoda 8 1.6 3 4.8 Streblospio benedicti 3 1.1 3 3.3 Arthropoda Insecta Coleoptera Berosus sp. 12 1.5 10 15.0 Diptera Bezzia/Palpomyia complex 35 2.3 30 69.0 Chironomus decorus 31 1.0 30 30.0 Dicrotendipes nervosus 97 1.0 30 30.0 Goeldichironomus devineyae 17 2.0 10 20.0 Tabanus sp. 2 1.4 1 1.4 Tanytarsus sp. 106 2.3 100 230.0 Malacostraca Amphipoda Apocorophium lacustre 55 2.2 30 66.0 Apocorophium sp. 236 2.2 100 220.0 Gammarus tigrinus 396 2.0 100 200.0 Isopoda Cassidinidea lunifrons 3 2.0 3 6.0 Mollusca Bivalvia Veneroida Mulinia lateralis 2 2.3 1 2.3 Gastropoda Neotaenioglossa Littoridinops tenuipes 389 2.0 100 200.0 Total 561 1,117.8 Estuarine Biotic Index = 1.99 Total taxa = 18 Total taxa with sensitivity values = 15 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-94 Table 1-85. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the DCUT11 downstream station in May 2020. Species/taxon DCUT11 Downstream Samples 1 2 3 4 5 Average Annelida Polychaeta Eteone heteropoda 0 0 0 3 8 2.2 Streblospio benedicti 4 0 0 0 0 0.8 Arthropoda Insecta Coleoptera Berosus sp. 2 0 0 0 0 0.4 Diptera Bezzia/Palpomyia complex 0 0 6 12 8 5.2 Chironomus decorus 2 16 24 36 12 18.0 Chrysops sp. 0 0 0 0 4 0.8 Dicrotendipes nervosus 4 44 72 100 100 64.0 Goeldichironomus devineyae 0 0 0 6 8 2.8 Parachironomus sp. 0 0 0 3 0 0.6 Tanytarsus sp. 2 20 15 81 100 43.6 Malacostraca Amphipoda Apocorophium lacustre 12 100 75 100 100 77.4 Apocorophium sp. 38 100 100 100 100 87.6 Gammarus tigrinus 100 100 100 100 100 100.0 Isopoda Cyathura polita 0 0 0 0 4 0.8 Ostracoda Podocopida Cyprideis littoralis 4 12 24 9 8 11.4 Mollusca Bivalvia Veneroida Macoma tenta 0 0 0 3 4 1.4 Gastropoda Neotaenioglossa Littoridinops tenuipes 4 0 12 0 4 4.0 Total taxa by sample 172 392 428 553 560 Total abundance = 2105 Total taxa present = 16 Shannon -Wiener diversity = 1.96 1-95 Table 1-86. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT11 downstream station in Ma v 2020. Species/taxona Number of individuals" Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Eteone heteropoda 11 1.6 10 16.0 Streblospio benedicti 4 1.1 3 3.3 Arthropoda Insecta Coleoptera Berosus sp. 2 1.5 1 1.5 Diptera Bezzia/Palpomyia complex 26 2.3 10 23.0 Chironomus decorus 90 1.0 30 30.0 Chrysops sp. 4 2.2 3 6.6 Dicrotendipes nervosus 320 1.0 100 100.0 Goeldichironomus devineyae 14 2.0 10 20.0 Parachironomus sp. 3 1.1 3 3.3 Tanytarsus sp. 218 2.3 100 230.0 Malacostraca Amphipoda Apocorophium lacustre 387 2.2 100 220.0 Apocorophium sp. 438 2.2 100 220.0 Gammarus tigrinus 500 2.0 100 200.0 Isopoda Cyathura polka 4 2.0 3 6.0 Mollusca Bivalvia Veneroida Macoma tenta 7 2.0 3 6.0 Gastropoda Neotaenioglossa Littoridinops tenuipes 20 2.0 10 20.0 Total 586 1105.7 Estuarine Biotic Index = 1.89 Total taxa = 16 Total taxa with sensitivity values = 15 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-96 Table 1-87. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the DCUT19 upstream station in May 2020. Species/taxon DCUT19 Upstream Samples 1 2 3 4 5 Average Annelida 0 0 0 0 N N N 0 0 0 N O O 0 00 (V 7r N co Polychaeta Amphicteis floridus 0 0 1 0 0.2 Eteone heteropoda 2 4 1 2 1.8 Laeonereis culveri 0 0 0 2 0.4 Polydora cornuta 0 2 0 2 0.8 Streblospio benedicti 0 0 0 0 0.8 Arthropoda Insecta Diptera Apedilum sp. 0 0 0 0 0.4 Bezzia/Palpomyia complex 6 0 1 4 2.6 Chironomus decorus 2 10 0 14 5.6 Dicrotendipes nervosus 4 0 0 0 0.8 Glyptotendipes sp. 0 0 0 6 1.2 Parachironomus sp. 0 0 1 0 0.2 Tabanus sp. 0 0 0 0 0.4 Tanytarsus sp. 0 0 1 4 1.0 Hemiptera Corixidae sp. 0 0 0 2 0.4 Malacostraca Amphipoda Apocorophium louisianum 6 4 1 4 3.0 Apocorophium sp. 40 26 14 40 25.6 Gammarus tigrinus 2 10 2 6 4.4 Tanaidacea Hargeria rapax 4 2 0 14 4.8 Ostracoda Podocopida Candonidae sp. 6 6 1 18 7.0 Cyprideis littoralis 2 6 0 2 2.4 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 28 4 3 34 16.6 Total taxa by sample 102 74 26 154 Total abundance = 402 Total taxa present = 20 Shannon -Wiener diversity = 2.23 1-97 Table 1-88. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT19 upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 1 2.0 1 2.0 Eteone heteropoda 9 1.6 3 4.8 Laeonereis culveri 2 1.0 1 1.0 Polydora cornuta 4 1.2 3 3.6 Streblospio benedicti 4.0 1.1 3.0 3.3 Arthropoda Insecta Diptera Apedilum sp. 2 4.0 1 4.0 Bezzia/Palpomyia complex 13 2.3 10 23.0 Chironomus decorus 28 1.0 10 10.0 Dicrotendipes nervosus 4 1.0 3 3.0 Glyptotendipes sp. 6 1.3 3 3.9 Parachironomus sp. 1 1.1 1 1.1 Tabanus sp. 2 1.4 1 1.4 Tanytarsus sp. 5 2.3 3 6.9 Hemiptera Corixidae sp. 2 1.3 1 1.3 Malacostraca Amphipoda Apocorophium louisianum 15 2.2 10 22.0 Apocorophium sp. 128 2.2 100 220.0 Gammarus tigrinus 22 2.0 10 20.0 Tanaidacea Hargeria rapax 24 1.6 10 16.0 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 83 2.0 30 60.0 Total 204 407.3 Estuarine Biotic Index = 2.00 Total taxa = 20 Total taxa with sensitivity values = 19 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-98 Table 1-89. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the DCUT19 downstream station in May 2020. Species/taxon DCUT19 Downstream Samples 1 2 3 4 5 Average Annelida Clitellata Naididae sp. w/o hair 0 0 0 0 3 0.6 Tubificoides heterochaetus 0 0 0 0 3 0.6 Polychaeta Amphicteis floridus 9 0 0 0 69 15.6 Eteone heteropoda 0 0 15 0 3 3.6 Heteromastus filiformis 3 15 6 9 3 7.2 Mediomastus ambiseta 0 0 3 0 0 0.6 Marenzelleria viridis 3 3 3 0 0 1.8 Polydora cornuta 0 0 0 0 6 1.2 Streblospio benedicti 6 0 0 3 3 2.4 Arth ropoda Insecta Coleoptera Berosus sp. 0 3 0 0 0 0.6 Diptera Apedilum sp. 0 0 0 0 3 0.6 Bezzia/Palpomyia complex 0 3 6 0 0 1.8 Chironomus decorus 0 0 0 0 6 1.2 Dicrotendipes nervosus 3 0 0 3 0 1.2 Parachironomus sp. 0 0 0 0 9 1.8 Tanytarsus sp. 0 0 0 3 3 1.2 Malacostraca Amphipoda Apocorophium louisianum 6 0 0 0 42 9.6 Apocorophium sp. 93 100 24 27 100 68.8 Gammarus tigrinus 100 100 81 100 54 87.0 Isopoda Cassidinidea lunifrons 6 0 0 0 0 1.2 Cyathura polita 6 15 3 0 12 7.2 Tanaidacea Hargeria rapax 100 100 100 100 100 100.0 Ostracoda Podocopida Candonidae sp. 0 0 6 0 0 1.2 Cyprideis littoralis 3 0 0 0 3 1.2 Mollusca Bivalvia Veneroida Macoma tenta 0 0 0 0 3 0.6 Mytilopsis leucophaeata 3 3 0 0 0 1.2 Gastropoda Neotaenioglossa Littoridinops tenuipes 21 6 0 6 39 14.4 Total taxa by sample 362 348 247 251 464 Total abundance = 1672 Total taxa present = 25 Shannon -Wiener diversity = 1.98 1-99 Table 1-90. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT19 downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Naididae sp. w/o hair 3 1.0 3 3.0 Tubificoides heterochaetus 3 1.1 3 3.3 Polychaeta Amphicteis floridus 78 2.0 30 60.0 Eteone heteropoda 18 1.6 10 16.0 Heteromastus filiformis 36 1.1 30 33.0 Mediomastus ambiseta 3 2.0 3 6.0 Marenzelleria viridis 9 2.6 3 7.8 Polydora cornuta 6 1.2 3 3.6 Streblospio benedicti 12 1.1 10 11.0 Arthropoda I nsecta Coleoptera Berosus sp. 3 1.5 3 4.5 Diptera Apedilum sp. 3 4.0 3 12.0 Bezzia/Palpomyia complex 9 2.3 3 6.9 Chironomus decorus 6 1.0 3 3.0 Dicrotendipes nervosus 6 1.0 3 3.0 Parachironomus sp. 9 1.1 3 3.3 Tanytarsus sp. 6 2.3 3 6.9 Malacostraca Amphipoda Apocorophium louisianum 48 2.2 30 66.0 Apocorophium sp. 344 2.2 100 220.0 Gammarus tigrinus 435 2.0 100 200.0 Isopoda Cassidinidea lunifrons 6 2.0 3 6.0 Cyathura polita 36 2.0 30 60.0 Tanaidacea Hargeria rapax 500 1.6 100 160.0 Mollusca Bivalvia Veneroida Macoma tenta 3 2.0 3 6.0 Mytilopsis leucophaeata 6 1.5 3 4.5 Gastropoda Neotaenioglossa Littoridinops tenuipes 72 2.0 30 60.0 Total 515 965.8 Estuarine Biotic Index = 1.88 Total taxa = 25 Total taxa with sensitivity values = 23 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. Sensitivity values provided by NCDWR. 1-100 Table 1-91. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Duck Creek upstream station in May 2020. Species/taxon Duck Creek Upstream Samples 1 2 3 4 5 Average Annelida Polychaeta Amphicteis floridus 30 22 18 38 18 25.2 Arthropoda Insecta Coleoptera Berosus sp. 0 0 0 2 0 0.4 Diptera Bezzia/Palpomyia Complex 1 0 0 2 2 1.0 Chrysops sp. 0 0 0 0 2 0.4 Malacostraca Amphipoda Apocorophium sp. 1 0 0 0 0 0.2 Gammarus tigrinus 2 2 6 4 14 5.6 Ostracoda Podocopida Candonidae sp. 0 14 0 4 2 4.0 Cyprideis littoralis 6 10 0 2 4 4.4 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 2 2 0 0 2 1.2 Total taxa by sample 42 50 24 52 44 Total abundance = 212 Total taxa present = 9 Shannon -Wiener diversity = 1.34 1-101 Table 1-92. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Duck Creek upstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Polychaeta Amphicteis floridus 126 2.0 100 200.0 Arthropoda Insecta Coleoptera Berosus sp. 2 1.5 1 1.5 Diptera Bezzia/Palpomyia Complex 5 2.3 3 6.9 Chrysops sp. 2 2.2 1 2.2 Malacostraca Amphipoda Apocorophium sp. 1 2.2 1 2.2 Gammarus tigrinus 28 2.0 10 20.0 Mollusca Gastropoda Neotaenioglossa Littoridinops tenuipes 6 2.0 3 6.0 Total 119 238.8 Estuarine Biotic Index = 2.01 Total taxa = 9 Total taxa with sensitivity values = 7 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-102 Table 1-93. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Duck Creek downstream station in May 2020. Species/taxon Duck Creek Downstream Samples 1 2 3 4 5 Average Annelida Clitellata Tubificoides heterochaetus 0 0 0 0 1 0.2 Polychaeta Eteone heteropoda 1 0 4 1 0 1.2 Marenzelleria viridis 0 0 1 0 0 0.2 Mediomastus ambiseta 47 38 100 92 54 66.2 Streblospio benedicti 0 11 23 19 1 10.8 Arthropoda Insecta Diptera Chironomus decorus 1 3 4 6 3 3.4 Coelotanypus sp. 1 0 1 0 1 0.6 Malacostraca Amphipoda Apocorophium lacustre 0 0 1 0 0 0.2 Apocorophium sp. 0 0 2 0 0 0.4 Gammarus mucronatus 0 0 0 1 0 0.2 Gammarus tigrinus 0 1 8 1 1 2.2 Ostracoda Podocopida Cyprideis littoralis 0 1 0 5 1 1.4 Mollusca Bivalvia Veneroida Macoma tenta 1 0 1 1 0 0.6 Mulinia lateralis 0 1 0 0 0 0.2 Gastropoda Littoridinops tenuipes 1 1 3 0 0 1.0 Nemertea sp. 0 0 0 0 1 0.2 Total taxa by sample 51 56 144 125 62 Total abundance = 445 Total taxa present = 15 Shannon -Wiener diversity = 1.04 1-103 Table 1-94. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Duck Creek downstream station in Ma v 2020. Species/taxona Number of individualsb Sensitivity value (SV)c Abundance value (n) Product of (SV)(n) Annelida Clitellata Tubificoides heterochaetus 1 1.1 1 1.1 Polychaeta Eteone heteropoda 6 1.6 3 4.8 Marenzelleria viridis 1 2.6 1 2.6 Mediomastus ambiseta 331 2 100 200.0 Streblospio benedicti 54 1.1 30 33.0 Arthropoda Insecta Diptera Chironomus decorus 17 1.0 10 10.0 Coelotanypus sp. 3 1.8 3 5.4 Malacostraca Amphipoda Apocorophium lacustre 1 2.2 1 2.2 Apocorophium sp. 2 2.2 1 2.2 Gammarus mucronatus 1 2.3 1 2.3 Gammarus tigrinus 11 2.0 10 20.0 Mollusca Bivalvia Veneroida Macoma tents 3 2.0 3 6.0 Mulinia lateralis 1 2.3 1 2.3 Gastropoda Littoridinops tenuipes 5 2.0 3 6.0 Total 168 297.9 Estuarine Biotic Index = 1.77 Total taxa = 15 Total taxa with sensitivity values = 13 a Only those taxa for which a sensitivity value is available are displayed. b Total number of individuals caught in all five ponar replicates. ° Sensitivity values provided by NCDWR. 1-104