Intraspecific variation in thermal tolerance differs between tropical and temperate fishes
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Intraspecific variation in thermal tolerance differs between tropical and temperate fishes. / Nati, J. J. H.; Svendsen, M. B. S.; Marras, S.; Killen, S. S.; Steffensen, J. F.; McKenzie, D. J.; Domenici, P.
In: Scientific Reports, Vol. 11, 21272, 2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Intraspecific variation in thermal tolerance differs between tropical and temperate fishes
AU - Nati, J. J. H.
AU - Svendsen, M. B. S.
AU - Marras, S.
AU - Killen, S. S.
AU - Steffensen, J. F.
AU - McKenzie, D. J.
AU - Domenici, P.
N1 - Publisher Copyright: © 2021, The Author(s).
PY - 2021
Y1 - 2021
N2 - How ectothermic animals will cope with global warming is a critical determinant of the ecological impacts of climate change. There has been extensive study of upper thermal tolerance limits among fish species but how intraspecific variation in tolerance may be affected by habitat characteristics and evolutionary history has not been considered. Intraspecific variation is a primary determinant of species vulnerability to climate change, with implications for global patterns of impacts of ongoing warming. Using published critical thermal maximum (CTmax) data on 203 fish species, we found that intraspecific variation in upper thermal tolerance varies according to a species’ latitude and evolutionary history. Overall, tropical species show a lower intraspecific variation in thermal tolerance than temperate species. Notably, freshwater tropical species have a lower variation in tolerance than freshwater temperate species, which implies increased vulnerability to impacts of thermal stress. The extent of variation in CTmax among fish species has a strong phylogenetic signal, which may indicate a constraint on evolvability to rising temperatures in tropical fishes. That is, in addition to living closer to their upper thermal limits, tropical species may have higher sensitivity and lower adaptability to global warming compared to temperate counterparts. This is evidence that freshwater tropical fish communities, worldwide, are especially vulnerable to ongoing climate change.
AB - How ectothermic animals will cope with global warming is a critical determinant of the ecological impacts of climate change. There has been extensive study of upper thermal tolerance limits among fish species but how intraspecific variation in tolerance may be affected by habitat characteristics and evolutionary history has not been considered. Intraspecific variation is a primary determinant of species vulnerability to climate change, with implications for global patterns of impacts of ongoing warming. Using published critical thermal maximum (CTmax) data on 203 fish species, we found that intraspecific variation in upper thermal tolerance varies according to a species’ latitude and evolutionary history. Overall, tropical species show a lower intraspecific variation in thermal tolerance than temperate species. Notably, freshwater tropical species have a lower variation in tolerance than freshwater temperate species, which implies increased vulnerability to impacts of thermal stress. The extent of variation in CTmax among fish species has a strong phylogenetic signal, which may indicate a constraint on evolvability to rising temperatures in tropical fishes. That is, in addition to living closer to their upper thermal limits, tropical species may have higher sensitivity and lower adaptability to global warming compared to temperate counterparts. This is evidence that freshwater tropical fish communities, worldwide, are especially vulnerable to ongoing climate change.
U2 - 10.1038/s41598-021-00695-8
DO - 10.1038/s41598-021-00695-8
M3 - Journal article
C2 - 34711864
AN - SCOPUS:85118364306
VL - 11
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
M1 - 21272
ER -
ID: 285240304