Examination of the influence of juvenile Atlantic salmon on the feeding mode of juvenile steelhead in Lake Ontario tributaries

Journal of Great Lakes Research
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Abstract

We examined diets of 1204 allopatric and sympatric juvenile Atlantic salmon (Salmo salar) and steelhead (Oncorhynchus mykiss) in three tributaries of Lake Ontario. The diet composition of both species consisted primarily of ephemeropterans, trichopterans, and chironomids, although juvenile steelhead consumed more terrestrial invertebrates, especially at the sympatric sites. Subyearlings of both species consumed small prey (i.e. chironomids) whereas large prey (i.e. perlids) made up a higher percentage of the diet of yearlings. The diet of juvenile steelhead at the allopatric sites was more closely associated with the composition of the benthos than with the drift, but was about equally associated with the benthos and drift at the sympatric sites. The diet of both subyearling and yearling Atlantic salmon was more closely associated with the benthos than the drift at the sympatric sites. The evidence suggests that juvenile steelhead may subtly alter their feeding behavior in sympatry with Atlantic salmon. This behavioral adaptation may reduce competitive interactions between these species.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Examination of the influence of juvenile Atlantic salmon on the feeding mode of juvenile steelhead in Lake Ontario tributaries
Series title Journal of Great Lakes Research
DOI 10.1016/j.jglr.2014.03.005
Volume 40
Issue 2
Year Published 2014
Language English
Publisher International Association for Great Lakes Research
Publisher location Toronto
Contributing office(s) Great Lakes Science Center
Description 7 p.
First page 370
Last page 376
Country United States
State New York
Other Geospatial Little Sandy Creek, Orwell Brook, Trout Brook
Online Only (Y/N) N
Additional Online Files (Y/N) N