Sep 10, 2017

Heritable variation in bleaching responses and its functional genomic basis in reef-building corals (Orbicella faveolata)

BioRxiv : the Preprint Server for Biology
Katherine DziedzicEli Meyer

Abstract

Reef-building corals are highly sensitive to rising ocean temperatures, and substantial adaptation will be required for animals and the ecosystems they support to persist in changing ocean conditions. Genetic variation that might support adaptive responses has been measured in larval stages of some corals, but these estimates remain unavailable for adult corals and the functional basis of this variation remains unclear. In this study, we focused on the potential for adaptation in Orbicella faveolata , a dominant reef-builder in the Caribbean. We conducted thermal stress experiments using corals collected from natural populations in Bocas del Toro, Panama, and used multilocus SNP genotypes to estimate genetic relatedness among samples. This allowed us to estimate narrow-sense heritability of variation in bleaching responses, revealing that this variation was highly heritable ( h2 =0.91). This estimate suggests substantial potential for adaptive responses to warming by natural populations of O. faveolata in this region. To investigate the functional basis for this variation, we applied genomic and transcriptomic approaches enabled by expanding sequence resources for this species. We used a genetic linkage map we have recently dev...Continue Reading

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Mentioned in this Paper

Biological Markers
Thermotolerance
Study
Coral
Physiological Stress
Genome
Genetic Analysis
Genetic Screening Method
Genetic Markers
Gene Expression

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