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Comparative diets of subyearling Atlantic salmon and subyearling coho salmon in Lake Ontario tributaries

Journal of Great Lakes Research

By:
and
https://doi.org/10.1016/j.jglr.2016.05.007

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Abstract

Restoration of Atlantic salmon (Salmo salar) in Lake Ontario could potentially be negatively affected by the presence of non-native salmonids that are naturalized in the basin. Coho salmon (Oncorhynchus kisutch) have been spawning successfully in Lake Ontario tributaries for over 40 years and their juveniles will reside in streams with juvenile Atlantic salmon for one year. This study sought to examine interspecific diet associations between these species, and to compare diets to the composition of the benthos and drift in three Lake Ontario tributaries. Aquatic insects, mainly ephemeropterans and chironomids were the major prey consumed by subyearling Atlantic salmon whereas terrestrial invertebrates made up only 3.7% of the diet. Ephemeropterans and chironomids were the primary aquatic taxa consumed by subyearling coho salmon but, as a group, terrestrial invertebrates (41.8%) were the major prey. In sympatry, Atlantic salmon fed more actively from the benthos whereas the diet of coho salmon was more similar to the drift. The different feeding pattern of each species resulted in low interspecific diet similarity. There is likely little competition between these species for food in Lake Ontario tributaries as juveniles.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Comparative diets of subyearling Atlantic salmon and subyearling coho salmon in Lake Ontario tributaries
Series title:
Journal of Great Lakes Research
DOI:
10.1016/j.jglr.2016.05.007
Volume:
42
Issue:
4
Year Published:
2016
Language:
English
Publisher:
International Association for Great Lakes Research
Contributing office(s):
Great Lakes Science Center
Description:
7 p.
First page:
854
Last page:
860
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