Disentangling bottom-up and top-down effects on survival during early ocean residence in a population of Chinook salmon (Oncorhynchus tshawytscha)

Jessica A. Miller, David J. Teel, Antonio Baptista, Cheryl A. Morgan

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We evaluated the relative importance of "bottom-up" (production-limited) and "top-down" (predator-mediated) processes during early marine residence in a population of Chinook salmon (Oncorhynchus tshawytscha) from the upper Columbia River, USA. We examined length, mass, and condition index of age-0 juveniles collected in the ocean during June and September across 11 years in relation to conditions in the river, estuary, and coastal ocean and to future adult returns. Characteristics of juveniles in September, but not June, were related to adult returns. During years when coastal waters were relatively cool and productive, juveniles captured in September displayed relatively low condition and reduced otolith growth compared with years when coastal waters were relatively warm and unproductive; this contrast indicates that top-down effects such as selective mortality or competition are important during early marine residence. Key physical (river plume volume during emigration) and biological (condition) variables and their interaction accounted for >95% of the variation in adult returns. Future research should focus on evaluating predators and competitors and understanding how river plume structure influences survival.

Original languageEnglish (US)
Pages (from-to)617-629
Number of pages13
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume70
Issue number4
DOIs
StatePublished - Mar 2013

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Oncorhynchus tshawytscha
river plume
oceans
rivers
coastal water
ocean
predator
predators
Columbia River
emigration
otolith
otoliths
river
estuaries
estuary
mortality
effect

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics

Cite this

Disentangling bottom-up and top-down effects on survival during early ocean residence in a population of Chinook salmon (Oncorhynchus tshawytscha). / Miller, Jessica A.; Teel, David J.; Baptista, Antonio; Morgan, Cheryl A.

In: Canadian Journal of Fisheries and Aquatic Sciences, Vol. 70, No. 4, 03.2013, p. 617-629.

Research output: Contribution to journalArticle

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