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  • Title: CORAL REEFS. Genomic determinants of coral heat tolerance across latitudes.
    Author: Dixon GB, Davies SW, Aglyamova GA, Meyer E, Bay LK, Matz MV.
    Journal: Science; 2015 Jun 26; 348(6242):1460-2. PubMed ID: 26113720.
    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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