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Profundal Benthic Habitat
Profundal Bottom Fauna
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autumnal benthic animals benthic zones bottom deposits bottom mud bottom population bottom samples chironomid Chironomus Chironomus larvae CN CN CN concentration zone contour Corethra larvae curves deeper water deepest depth distribution detritus dissolved oxygen Douglas and Third Douglas Lake factors Fairy Island depression ficidae free carbon dioxide Free CO2 ppm Grapevine Channel hypolimnion jars July June Kirkville Green Lake lake bottom lake floor Lake Mendota Lake Nipigon layers littoral zone meters Date Nematoda North Fish-Tail Bay November November 24 Number per square omus Proten Oneida Lake ostracods Oxygen cc physical-chemical Pisidium profundal bottom fauna profundal zone Protenthes larvae qualitative quantitative Roberts Point depression Samples Number sampling series Seasonal variation Sedge Point depression shallow water shore South Fish-Tail depression species square meter Station Stony Point depression sublittoral sublittoral zone temperature thermocline Third Sister Lake Tubi tubificids typical profundal unit area variation of bottom