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Bioenergetic response by steelhead to variation in diet, thermal habitat, and climate in the north Pacific Ocean

Transactions of the American Fisheries Society

By:
, , ,
DOI: 10.1080/00028487.2012.675914

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Abstract

Energetic responses of steelhead Oncorhynchus mykiss to climate-driven changes in marine conditions are expected to affect the species’ ocean distribution, feeding, growth, and survival. With a unique 18-year data series (1991–2008) for steelhead sampled in the open ocean, we simulated interannual variation in prey consumption and growth efficiency of steelhead using a bioenergetics model to evaluate the temperature-dependent growth response of steelhead to past climate events and to estimate growth potential of steelhead under future climate scenarios. Our results showed that annual ocean growth of steelhead is highly variable depending on prey quality, consumption rates, total consumption, and thermal experience. At optimal growing temperatures, steelhead can compensate for a low-energy diet by increasing consumption rates and consuming more prey, if available. Our findings suggest that steelhead have a narrow temperature window in which to achieve optimal growth, which is strongly influenced by climate-driven changes in ocean temperature.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Bioenergetic response by steelhead to variation in diet, thermal habitat, and climate in the north Pacific Ocean
Series title:
Transactions of the American Fisheries Society
DOI:
10.1080/00028487.2012.675914
Volume
141
Issue:
4
Year Published:
2012
Language:
English
Publisher:
Taylor & Francis
Publisher location:
Philadelphia, PA
Contributing office(s):
Washington Cooperative Fish and Wildlife Research Unit
Description:
16 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Transactions of the American Fisheries Society
First page:
1081
Last page:
1096
Other Geospatial:
Pacific Ocean