EPSCoR - Alaska Adapting to Changing Environments

EPSCoR - Alaska Adapting to Changing Environments

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Low productivity of Chinook salmon strongly correlates with high summer stream discharge in two Alaskan rivers in the Yukon drainage

Yukon River Chinook salmon (Oncorhynchus tshawytscha) populations are declining for unknown reasons, creating hardship for thousands of stakeholders in subsistence and commercial fisheries. An informed response to this crisis requires understanding the major sources of variation in Chinook salmon productivity. However, simple stock–recruitment models leave much of the variation in this system’s productivity unexplained. We tested adding environmental predictors to stock–recruitment models for two Yukon drainage spawning streams in interior Alaska — the Chena and Salcha rivers. Low productivity was strongly associated with high stream discharge during the summer of freshwater residency for young-of-the-year Chinook salmon. This association was more consistent with the hypothesis that sustained high discharge negatively affects foraging conditions than with acute mortality during floods. Productivity may have also been reduced in years when incubating eggs experienced major floods or cold summers and falls. These freshwater effects — especially density dependence and high discharge — helped explain population declines in both rivers. They are plausible as contributors to the decline of Chinook salmon throughout the Yukon River drainage.

Data and Resources

  • View website
    Website :: Publisher's website

    http://www.nrcresearchpress.com/doi/full/10.1139/cjfas-2014-0498#.V-sFgvkrKUm

Status: Complete
Type: Project
Data Types: Report
Primary Contact
Kofinas, Gary
Email: gary.kofinas@alaska.edu
Primary Agency
EPSCoR - Alaska Adapting to Changing Environments
Type
Academic

Funding Agency
EPSCoR - Alaska Adapting to Changing Environments
Type
Academic

Other Agencies
National Science Foundation

ISO Topics
economy, environment, inlandWaters

Geo-keywords
Alaska

Source Portal
Northern Test Case ::

Direct Record Link
http://epscor.portal.gina.alaska.edu/catalogs/11760-low-productivity-of-chinook-salmon-strongly-cor
  • 01c8ceef3d596f40f05bf496ca00d929
    Published by Lisa
    2016-09-28 16:04:01 -0800
  • 01c8ceef3d596f40f05bf496ca00d929
    Updated by Lisa
    2016-09-28 16:03:55 -0800
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    Updated by Lisa
    2016-09-28 16:02:51 -0800
  • 01c8ceef3d596f40f05bf496ca00d929
    Updated by Lisa
    2016-09-28 15:59:32 -0800
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    New record created
    2016-09-27 15:51:41 -0800
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