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
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB85-103000 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
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.) |
Availability Notes |
Pub. in Jnl. of Great Lakes Research 8, n4 p603-613 1982. |
NTIS Title Notes |
Journal article. |
Title Annotations |
Reprint: Vertical Distribution of Profundal Benthos in Lake Superior Sediments. |
PUB Date Free Form |
c1982 |
Category Codes |
6C; 8H; 57Z; 48G |
NTIS Prices |
Not available NTIS |
Primary Description |
600/03 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
500425300 |
Origin |
NTIS |
Type |
CAT |