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Distribution of Hexagenia nymphs and visible oil in sediments of the Upper Great Lakes connecting channels

Hydrobiologia

By:
, , , and
DOI:10.1007/BF00024767

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Abstract

As part of the study of the Upper Great Lakes Connecting Channels sponsored by the U.S. Environmental Protection Agency, the U.S. Fish and Wildlife Service examined the occurrence ofHexagenia nymphs and visible oil in sediments at 250 stations throughout the St. Marys River and the St. Clair-Detroit River system from May 14 to June 11, 1985. The mean density of Hexagenianymphs per square meter averaged 194 for the total study area, 224 in the St. Marys River, 117 in the St. Clair River, 279 in Lake St. Clair, and 94 in the Detroit River. The maximum density of nymphs ranged from 1,081 to 1,164 m-2 in the three rivers and was 3,099 m-2 in Lake St. Clair. A comparison of nymph density at 46 stations where oil was observed in sediments physically suitable for nymphs showed that densities were lower in oiled sediments (61 m-2) than in sediments without oil (224 m-2). Densities of nymphs were relatively high at only four stations where oil was observed in sediments. In general, oiled sediments and low densities of nymphs occurred together downstream from industrial and municipal discharges.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Distribution of Hexagenia nymphs and visible oil in sediments of the Upper Great Lakes connecting channels
Series title:
Hydrobiologia
DOI:
10.1007/BF00024767
Volume:
219
Issue:
1
Year Published:
1991
Language:
English
Publisher:
Springer
Contributing office(s):
Great Lakes Science Center
Description:
8 p.
First page:
345
Last page:
352
Online Only (Y/N):
N
Additional Online Files (Y/N):
N