Title |
Genomic determinants of coral heat tolerance across latitudes
|
---|---|
Published in |
Science, June 2015
|
DOI | 10.1126/science.1261224 |
Pubmed ID | |
Authors |
Groves B Dixon, Sarah W Davies, Galina A Aglyamova, Eli Meyer, Line K Bay, Mikhail V Matz |
Abstract |
As global warming continues, reef-building corals could avoid local population declines through "genetic rescue" involving exchange of heat-tolerant genotypes across latitudes, but only if latitudinal variation in thermal tolerance is heritable. Here, we show an up-to-10-fold increase in odds of survival of coral larvae under heat stress when their parents come from a warmer lower-latitude location. Elevated thermal tolerance was associated with heritable differences in expression of oxidative, extracellular, transport, and mitochondrial functions that indicated a lack of prior stress. Moreover, two genomic regions strongly responded to selection for thermal tolerance in interlatitudinal crosses. These results demonstrate that variation in coral thermal tolerance across latitudes has a strong genetic basis and could serve as raw material for natural selection. |
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