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Cryptic lineages respond differently to coral bleaching
  • Matias Gómez-Corrales,
  • Carlos Prada
Matias Gómez-Corrales
University of Rhode Island
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Carlos Prada
University of Rhode Island
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Abstract

Coral reefs are losing coral cover across the globe largely as a result of a rise in seawater temperatures that trigger coral bleaching and induce coral mortality. How coral reefs will respond to climate change will be a function of genetic variation and how it is partitioned among species. A critical initial step is to accurately delineate species and quantify their physiological potential to cope with heat stress. Cryptic species, morphologically indistinguishable but genetically different ones, typically harbor distinct physiological variation and respond differently to climatic changes. A dominant Caribbean reef builder severely affected by climate change is the mountainous star coral, Orbicella faveolata. Recently, Dziedzic et al. (2019) reported genetic variation in the physiological response to thermal stress in a single population of this species, suggesting that variation within populations will allow these corals to adapt to rising ocean temperatures. We reanalyzed their data and found multiple cryptic lineages rather than a single panmictic population, with only one of the lineages being heat-tolerant. Our finding of hidden lineages within a threatened species highlights the varying extinction risks faced by these independently evolving groups, especially when the prospects of survival under warmer oceans seem favorable for a few of them only.

Peer review status:ACCEPTED

17 May 2020Submitted to Molecular Ecology
19 May 2020Submission Checks Completed
19 May 2020Assigned to Editor
04 Jun 2020Reviewer(s) Assigned
04 Jul 2020Review(s) Completed, Editorial Evaluation Pending
06 Jul 2020Editorial Decision: Revise Minor
05 Aug 2020Review(s) Completed, Editorial Evaluation Pending
05 Aug 20201st Revision Received
20 Aug 2020Editorial Decision: Accept