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RECORD NUMBER: 47 OF 48

OLS Field Name OLS Field Data
Main Title Vertical Distribution of Profundal Benthos in Lake Superior Sediments.
Author Heuschele, A. S. ;
CORP Author Normandale Community Coll., Bloomington, MN.;Environmental Research Lab.-Duluth, MN.
Year Published 1982
Report Number EPA-R-806084; EPA/600/J-82/439;
Stock Number PB85-103000
Additional Subjects Benthos ; Sediments ; Lake Superior ; Sampling ; Worms ; Nematoda ; Cores ; Density(Mass/volume) ; Interfaces ; Depth ; Sands ; Clay soils ; Abundance ; Mixing ; Spatial distribution ; Larvae ; Reprints ; Biological mixing ; Oligochaeta ; Pontoporeia
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NTIS  PB85-103000 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 14p
Abstract
Layers of sediment in box cores from 10 Lake Superior open lake sites were sieved at 250 micrometers to retain benthos. The average density of benthic organisms, 3,055/sq m, was higher than has previously been reported for profundal regions of the lake, suggesting that biological mixing is important in the sediments. Bottom fauna were distributed from the water-sediment interface to a depth of 1.7 cm in firm glacial till and to a depth of 15 cm in soft clay. There was variability between sampling sites: oligochaetes and nematodes penetrated further into loose sediments than into compacted sand or clay. Ninety-six percent of the profundal benthos was found within the first four centimeters of sediment, with 47% between 0 and 0.5 cm (mostly Pontoporeia hoyi, naidids, sphaeriids, copepods, ostracods, and neorhabdocoels); 49% between 0.5 and 4 cm (mostly nematodes and oligochaetes); and 4% below 4 cm. The location of oligochaete cocoons containing embryos indicated that enchytraeid positions in the cores often represented their in situ vertical distribution. (Copyright (c) Internat. Assoc. Great Lakes Res. 1982.)