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Breeding site selection by coho salmon (Oncorhynchus kisutch) in relation to large wood additions and factors that influence reproductive success

Canadian Journal of Fisheries and Aquatic Sciences

By:
https://doi.org/10.1139/cjfas-2014-0020

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Abstract

The fitness of female Pacific salmon (Oncorhynchus spp.) with respect to breeding behavior can be partitioned into at least four fitness components: survival to reproduction, competition for breeding sites, success of egg incubation, and suitability of the local environment near breeding sites for early rearing of juveniles. We evaluated the relative influences of habitat features linked to these fitness components with respect to selection of breeding sites by coho salmon (Oncorhynchus kisutch). We also evaluated associations between breeding site selection and additions of large wood, as the latter were introduced into the study system as a means of restoring habitat conditions to benefit coho salmon. We used a model selection approach to organize specific habitat features into groupings reflecting fitness components and influences of large wood. Results of this work suggest that female coho salmon likely select breeding sites based on a wide range of habitat features linked to all four hypothesized fitness components. More specifically, model parameter estimates indicated that breeding site selection was most strongly influenced by proximity to pool-tail crests and deeper water (mean and maximum depths). Linkages between large wood and breeding site selection were less clear. Overall, our findings suggest that breeding site selection by coho salmon is influenced by a suite of fitness components in addition to the egg incubation environment, which has been the emphasis of much work in the past.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Breeding site selection by coho salmon (Oncorhynchus kisutch) in relation to large wood additions and factors that influence reproductive success
Series title:
Canadian Journal of Fisheries and Aquatic Sciences
DOI:
10.1139/cjfas-2014-0020
Volume:
71
Issue:
10
Year Published:
2014
Language:
English
Publisher:
NRC Research Press
Contributing office(s):
Forest and Rangeland Ecosystem Science Center
Description:
10 p.
First page:
1498
Last page:
1507
Country:
United States
State:
Oregon
County:
Douglas County
Other Geospatial:
Little Wolf Creek
Online Only (Y/N):
N
Additional Online Files (Y/N):
N