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A short-term look at potential changes in Lake Michigan slimy sculpin diets

Journal of Great Lakes Research

By:
, , ,
DOI: 10.1016/j.jglr.2010.01.007

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Abstract

Diporeia hoyi and Mysis relicta are the most important prey items of slimy sculpins (Cottus cognatus) in the Great Lakes. Slimy sculpins were collected from dreissenid-infested bottoms off seven Lake Michigan ports at depths of 27–73 m in fall 2003 to study their lake-wide diets. Relatively large dreissenid biomass occurred at depths of 37- and 46-m. Quagga mussels (Dreissena bugnesis) composed at least 50% of dreissenid biomass at Manistique, Saugatuck, and Sturgeon Bay. Mysis accounted for 82% of the sculpin diet by dry weight at eastern Lake Michigan while Diporeia composed 54–69% of the diet at western Lake Michigan and dominated the diets of slimy sculpins at all sites deeper than 46 m. In northern Lake Michigan, this diet study in new sites showed that slimy sculpin consumed more prey with low energy contents, especially chironomids, than Mysis and Diporeia in shallow sites (depth <55 m). We recommend diet studies on sedentary benthic fishes to be conducted along perimeters of the Great Lakes to observe changes in their diets that may be impacted by changing benthic macroinvertebrate communities.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A short-term look at potential changes in Lake Michigan slimy sculpin diets
Series title:
Journal of Great Lakes Research
DOI:
10.1016/j.jglr.2010.01.007
Volume
36
Issue:
2
Year Published:
2010
Language:
English
Publisher:
International Association for Great Lakes Research
Publisher location:
Ann Arbor, MI
Contributing office(s):
Great Lakes Science Center
Description:
4 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Great Lakes Research
First page:
376
Last page:
379
Country:
United States