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The physiology of climate change: how potentials for acclimatization and genetic adaptation will determine ‘winners’ and ‘losers’

Somero, G. N.·2010·Journal of Experimental Biology

Abstract

SUMMARY: Physiological studies can help predict effects of climate change through determining which species currently live closest to their upper thermal tolerance limits, which physiological systems set these limits, and how species differ in acclimatization capacities for modifying their thermal tolerances. Reductionist studies at the molecular level can contribute to this analysis by revealing how much change in sequence is needed to adapt proteins to warmer temperatures — thus providing insights into potential rates of adaptive evolution — and determining how the contents of genomes — protein-coding genes and gene regulatory mechanisms — influence capacities for adapting to acute and long-term increases in temperature. Studies of congeneric invertebrates from thermally stressful rocky intertidal habitats have shown that warm-adapted congeners are most susceptible to local extinctions because their acute upper thermal limits (LT50 values) lie near current thermal maxima and their abilities to increase thermal tolerance through acclimation are limited. Collapse of cardiac function may underlie acute and longer-term thermal limits. Local extinctions from heat death may be offset by in-migration of genetically warm-adapted conspecifics from mid-latitude ‘hot spots’, where midday low tides in summer select for heat tolerance. A single amino acid replacement is sufficient to adapt a protein to a new thermal range. More challenging to adaptive evolution are lesions in genomes of stenotherms like Antarctic marine ectotherms, which have lost protein-coding genes and gene regulatory mechanisms needed for coping with rising temperature. These extreme stenotherms, along with warm-adapted eurytherms living near their thermal limits, may be the major ‘losers’ from climate change.

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Metadata

Authors
Somero, G. N.
Venue
Journal of Experimental Biology
Published
2010-03-15
Volume
213
Issue
6
Pages
912-920
ISSN
  • 0022-0949 (ISSN-L)
  • 1477-9145
OpenAlex
W2123111228
Cited by
1,892
References
3
FWCI
66.63
Type
journal article
Language
en
Open access
closed

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Somero, G. N. (2010). The physiology of climate change: how potentials for acclimatization and genetic adaptation will determine ‘winners’ and ‘losers’. Journal of Experimental Biology. https://doi.org/10.1242/jeb.037473

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