Intraspecific variation in tolerance of warming in fishes

Type Article
Date 2021-06
Language English
Author(s) McKenzie David1, Zhang Yurui2, Eliason E.J.3, Schulte P.M.2, Claireaux Guy4, Blasco F.R.5, 6, Nati Julie1, Farrell A.P.2, 7
Affiliation(s) 1 : MARBEC, Univ Montpellier, CNRS, IFREMER, IRD Montpellier ,France
2 : Department of Zoology University of British Columbia Vancouver BC, Canada
3 : UC Santa Barbara ,USA
4 : Université de Bretagne Occidentale, LEMAR (UMR 6539), Centre Ifremer de Bretagne Plouzané ,France
5 : Department of Physiological Sciences Federal University of São Carlos São Carlos SP, Brazil
6 : Joint Graduate Program in Physiological Sciences Federal University of São Carlos – UFSCar/São Paulo State University, UNESP Campus Araraquara Araraquara SP ,Brazil
7 : Faculty of Land and Food Systems University of British Columbia Vancouver BC, Canada
Source Journal Of Fish Biology (0022-1112) (Wiley), 2021-06 , Vol. 98 , N. 6 , P. 1536-1555
DOI 10.1111/jfb.14620
WOS© Times Cited 52
Note Special Issue: Effects of Global Warming on Fishes and Fisheries
Keyword(s) adaptation, critical thermal maximum, phenotypic plasticity, size effects, thermal performance curve, vulnerability

Intraspecific variation in key traits such as tolerance of warming can have profound effects on ecological and evolutionary processes, notably responses to climate change. We review the empirical evidence for three primary elements of intraspecific variation in tolerance of warming in fishes. The first is purely mechanistic, that tolerance varies across life stages and as fishes grow to maturity. The limited evidence indicates strongly that this is the case, possibly due to universal physiological principles. The second is intraspecific variation that is due to phenotypic plasticity, also a mechanistic phenomenon that buffers individuals’ sensitivity to negative impacts of global warming in their lifetime, or to some extent through epigenetic effects over successive generations. Although the evidence for plasticity in tolerance to warming is extensive, more work is required to understand underlying mechanisms and to reveal whether there are general patterns. The third element is intraspecific variation based upon heritable genetic differences in tolerance, which underlies local adaptation and may define long term adaptability of a species in the face of ongoing global change. There is clear evidence of local adaptation and some evidence of heritability of tolerance to warming, but the knowledge base is limited with detailed information for only a few model or emblematic species. There is also strong evidence of structured variation in tolerance of warming within species, which may have ecological and evolutionary significance irrespective of whether it reflects plasticity or adaptation. Although the overwhelming consensus is that having broader intraspecific variation in tolerance should reduce species vulnerability to impacts of global warming, there is not sufficient data on fishes to provide insight into particular mechanisms by which this may occur.

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