Marine heatwaves threaten cryptic coral diversity and erode associations among coevolving partners

Samuel Starko, James E. Fifer, Danielle C. Claar, Sarah W. Davies, Ross Cunning, Andrew C. Baker, Julia K. Baum

Research output: Contribution to journalArticlepeer-review

19 Citations (Web of Science)

Abstract

Climate change–amplified marine heatwaves can drive extensive mortality in foundation species. However, a paucity of longitudinal genomic datasets has impeded understanding of how these rapid selection events alter cryptic genetic structure. Heatwave impacts may be exacerbated in species that engage in obligate symbioses, where the genetics of multiple coevolving taxa may be affected. Here, we tracked the symbiotic associations of reef-building corals for 6 years through a prolonged heatwave, including known survivorship for 79 of 315 colonies. Coral genetics strongly predicted survival of the ubiquitous coral, Porites (massive growth form), with variable survival (15 to 61%) across three morphologically indistinguishable—but genetically distinct—lineages. The heatwave also disrupted strong associations between these coral lineages and their algal symbionts (family Symbiodiniaceae), with symbiotic turnover in some colonies, resulting in reduced specificity across lineages. These results highlight how heatwaves can threaten cryptic genotypes and decouple otherwise tightly coevolved relationships between hosts and symbionts.
Original languageEnglish
Article numbereadf0954
Pages (from-to)eadf0954
JournalScience Advances
Volume9
Issue number32
DOIs
Publication statusPublished - 11 Aug 2023

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