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Research article - Peer-reviewed, 2021

Flexible use of a dynamic energy landscape buffers a marine predator against extreme climate variability

Carroll, Gemma; Brodie, Stephanie; Whitlock, Rebecca; Ganong, James; Bograd, Steven J.; Hazen, Elliott; Block, Barbara A.

Abstract

Animal migrations track predictable seasonal patterns of resource availability and suitable thermal habitat. As climate change alters this 'energy landscape', some migratory species may struggle to adapt. We examined how climate variability influences movements, thermal habitat selection and energy intake by juvenile Pacific bluefin tuna (Thunnus orientalis) during seasonal foraging migrations in the California Current. We tracked 242 tuna across 15 years (2002-2016) with high-resolution archival tags, estimating their daily energy intake via abdominal warming associated with digestion (the 'heat increment of feeding'). The poleward extent of foraging migrations was flexible in response to climate variability, allowing tuna to track poleward displacements of thermal habitat where their standard metabolic rates were minimized. During a marine heatwave that saw temperature anomalies of up to +2.5 degrees C in the California Current, spatially explicit energy intake by tuna was approximately 15% lower than average. However, by shifting their mean seasonal migration approximately 900 km poleward, tuna remained in waters within their optimal temperature range and increased their energy intake. Our findings illustrate how tradeoffs between physiology and prey availability structure migration in a highly mobile vertebrate, and suggest that flexible migration strategies can buffer animals against energetic costs associated with climate variability and change.

Keywords

bluefin tuna; California Current; energy landscape; heat increment of feeding; highly migratory species; migration

Published in

Proceedings of the Royal Society B: Biological Sciences
2021, volume: 288, number: 1956, article number: 20210671
Publisher: ROYAL SOC

Authors' information

Carroll, Gemma
University of Washington
Brodie, Stephanie
University of California Santa Cruz
Swedish University of Agricultural Sciences, Department of Aquatic Resources
Ganong, James
Stanford University
Bograd, Steven J.
University of California Santa Cruz
Hazen, Elliott
University of California Santa Cruz
Block, Barbara A.
Stanford University

Sustainable Development Goals

SDG14 Life below water
SDG13 Climate action

UKÄ Subject classification

Ecology

Publication Identifiers

DOI: https://doi.org/10.1098/rspb.2021.0671

URI (permanent link to this page)

https://res.slu.se/id/publ/113379