Examination of the influence of juvenile Atlantic salmon on the feeding mode of juvenile steelhead in Lake Ontario tributaries
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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.
Study Area
| 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 |
| Google Analytic Metrics | Metrics page |