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

Carroll, Gemma and Brodie, Stephanie and Whitlock, Rebecca and Ganong, James and Bograd, Steven J. and Hazen, Elliott and Block, Barbara A. (2021). Flexible use of a dynamic energy landscape buffers a marine predator against extreme climate variability. Proceedings of the Royal Society B: Biological Sciences. 288 , 20210671
[Research article]

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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.

Authors/Creators:Carroll, Gemma and Brodie, Stephanie and Whitlock, Rebecca and Ganong, James and Bograd, Steven J. and Hazen, Elliott and Block, Barbara A.
Title:Flexible use of a dynamic energy landscape buffers a marine predator against extreme climate variability
Series Name/Journal:Proceedings of the Royal Society B: Biological Sciences
Year of publishing :2021
Volume:288
Article number:20210671
Number of Pages:9
Publisher:ROYAL SOC
ISSN:0962-8452
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:bluefin tuna, California Current, energy landscape, heat increment of feeding, highly migratory species, migration
URN:NBN:urn:nbn:se:slu:epsilon-p-113379
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113379
Additional ID:
Type of IDID
DOI10.1098/rspb.2021.0671
Web of Science (WoS)000684604700005
ID Code:25259
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:07 Sep 2021 10:25
Metadata Last Modified:07 Sep 2021 10:31

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