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Chapter 3 - Benthic HabitatsMid-Atlantic BightTable 3-8. Physical factor values that correspond to ecological thresholds in the Mid-Atlantic Bightsubregion.Bathymetry (m) Sediment Grain Size (mm) Seabed FormDepth (meters below sea level)050100150200250300350400450500550600650700750800850900950100010501100115012001250130013501400145015000-15 0-0.18 (silt and very fine sand Depression15-22 0.18-0.35 (fine sand) Mid Flat22-45 0.35-0.36 (sand) High Flat45-48 0.36 -0.48 (sand) Low Slope48-82 >=0.48 (coarse sand) Sideslope82-95 Steep95-592>592Benthic Habitat Types: Mid-Atlantic BightBH:768BH:64BH:87BH:38BH:1BH:7BH:2BH:32BH:4BH:25BH:233BH:592BH:306BH:395BH:218BH:520BH:84BH:1223BH:219BH:44BH:229BH:216BH:384BH:505Figure 3-18. Average depth and range of each benthic habitat type in the Mid-Atlantic Bight subregion. Lines represent twostandard deviations above and below the mean. Habitat types with the same depths often differ from each other by sedimentgrain size or topographic location. Habitats with very large depth ranges are widespread associations often unrelated to, oronly weakly correlated with, depth.Northwest Atlantic Marine Ecoregional Assessment • Phase 1 Report 3-43
Chapter 3 - Benthic HabitatsVery Shallow (0 – 22 m)Habitat 768 (22 Samples):Depressions in very shallow water (0 - 15 m) on silt to finesand.ArthropodsMysid shrimp (Neomysis americana)Other amphipods (Ampelisca abdita)MollusksElongated macoma (Macoma tenta)Tellin clam (Tellina sybaritica)Channeled whelk (Busycon canaliculatum)Cone snail (Kurtziella cerina)Dove shell (Mitrella lunata)Pyramid snail (Odostomia winkleyi)Solitary glassy bubble (Retusa canaliculata)Wentletraps (Epitonium rupicola)EchinodermsBurrowing brittle star (Micropholis atra)Habitat 64 (62 Samples):Depressions and mid-position flats in shallow water(15 and 22 m) on medium sand.AnnelidsBlood worm (Hemipodus roseus)Fringe worm (Tharyx sp.)Hesion worm (Microphthalmus sczelkowii)Thread worm (Lumbrineris acicularum)Paddle worm (Hesionura augeneri)Paraonid worm (Acmira catherinae, A. cerruti)Sandbar worm (Ophelia denticulata)Spaghetti-mouth worm (Ampharete arctica)Syllid worm (Brania wellfleetensis, Streptosyllis pettiboneae,S. websteri, Syllides longicirrata)Other polychaetes (Pisione remota)ArthropodsSharp-tailed cumacean (Oxyurostylis smithi)Other isopods (Chiridotea arenicola)MollusksBlue mussel (Mytilus edulis)Dove shell (Anachis lafresnayi)Eastern aligena (Aligena elevata)Habitat 87 (20 Samples):Depressions and high flats in shallow water (15 - 22 m)on medium sand.AnnelidsBurrowing scale worm (Sigalion areicola)Fringe worm (Caulleriella killariensis)Mageloni worm (Magelona riojai)Spionid mud worm (Scolelepis squamata, Dispio uncinata,Polydora caulleryi)Sphaerod worm (Sphaerodoropsis corrugata)Syllid worm (Streptosyllis varians)ArthropodsGlass shrimp (Leptochelia savignyi)Gammarid amphipods (Acanthohaustorius bousfieli,A.intermedius, A. Similis)Other amphipods (Bathyporeia quoddyensis, B. parkeri,B. quoddyensis, Parahaustorius attenuates, Synchelidiumamericanum)Tanaidacea (Tanaissus lilljeborgi)Other isopods (Chiridotea tuftsi)EchinodermsSand dollar (Encope emarginata)MollusksAtlantic razor (Siliqua costata)Gould’s pandora (Pandora trilineata)Lea’s spoon shell (Periploma leanum)Pandora (Pandora trilineata)Surf clam (Spisula solidissima)Margin shells (Dentimargo eburneolus)Habitat 38 (95 Samples):Depressions in water shallow (15 - 22 m) on medium tocoarse sand.3-44Northwest Atlantic Marine Ecoregional Assessment • Phase 1 Report
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© Barry Truit, TNC© Donna A. Dewh
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Assessment Core TeamSally YozellJen
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Chapter 1 - IntroductionImportant s
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Chapter 1 - Introductionabsorb wave
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Chapter 1 - Introduction1) Gulf of
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Chapter 1 - IntroductionSpecies and
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Chapter 1 - IntroductionMurawski, S
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Coastal EcosystemsCHAPTER2Barbara V
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Diadromous FishAlison BowdenCHAPTER
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Sea TurtleAdam Whelchel and Melissa
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