Climate-induced trends in predator–prey synchrony differ across life-history stages of an anadromous salmonid

Canadian Journal of Fisheries and Aquatic Sciences
By: , and 

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Abstract

Differential climate-induced shifts in phenology can create mismatches between predators and prey, but few studies have examined predator–prey mismatch across multiple life-history stages. We used long-term data from a warming stream with shifting salmonid migration timings to quantify intra-annual migration synchrony between predatory Dolly Varden (Salvelinus malma) and Pacific salmon prey and examined how predator–prey synchrony has been influenced by climate change. We demonstrate that Dolly Varden have become increasingly mismatched with spring downstream migrations of abundant pink salmon (Oncorhynchus gorbuscha) juveniles. However, Dolly Varden have remained matched with fall upstream migrations of spawning Pacific salmon, including coho (Oncorhynchus kisutch), sockeye (Oncorhynchus nerka), and pink salmon. Downstream predator–prey migration synchrony decreased over time and with higher temperatures, particularly with pink salmon. In contrast, upstream migration synchrony was temporally stable and increased with rising temperatures. Differing trends in Dolly Varden predator–prey synchrony may be explained by the direct use of salmon to cue upstream migration, but not downstream migration. Overall, we show that climate change can have differing impacts on predator–prey synchrony across life-history stages.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Climate-induced trends in predator–prey synchrony differ across life-history stages of an anadromous salmonid
Series title Canadian Journal of Fisheries and Aquatic Sciences
DOI 10.1139/cjfas-2016-0309
Volume 74
Issue 9
Year Published 2017
Language English
Publisher NRC Research Press
Contributing office(s) Northern Rocky Mountain Science Center
Description 8 p.
First page 1431
Last page 1438
Country United States
State Alaska
Other Geospatial Auke Lake