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Threatened salmon rely on a rare life history strategy in a warming landscape

Cordoleani, F and Phillis, CC and Sturrock, AM and FitzGerald, AM and Malkassian, A and Whitman, GE and Weber, PK and Johnson, RC (2021) 'Threatened salmon rely on a rare life history strategy in a warming landscape.' Nature Climate Change, 11 (11). pp. 982-988. ISSN 1758-678X

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Abstract

Rare phenotypes and behaviours within a population are often overlooked, yet they may serve a heightened role for species imperilled by rapid warming. In threatened spring-run Chinook salmon spawning at the southern edge of the species range, we show late-migrating juveniles are critical to cohort success in years characterized by droughts and ocean heatwaves. Late migrants rely on cool river temperatures over summer, increasingly rare due to the combined effects of warming and impassable dams. Despite the dominance of late migrants, other strategies played an important role in many years. Our results suggest that further loss of phenotypic diversity will have critical impacts on population persistence in a warming climate. Predicted thermally suitable river conditions for late migrants will shrink rapidly in the future and will be largely relegated above impassable dams. Reconnecting diverse habitat mosaics to support phenotypic diversity will be integral to the long-term persistence of this species.

Item Type: Article
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 03 Dec 2021 17:18
Last Modified: 18 Aug 2022 10:43
URI: http://repository.essex.ac.uk/id/eprint/31701

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