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Palau's warmest reefs harbor thermally tolerant corals that thrive across different habitats.

ABSTRACT: Ocean warming is killing corals, but heat-tolerant populations exist; if protected, they could replenish affected reefs naturally or through restoration. Palau's Rock Islands experience consistently higher temperatures and extreme heatwaves, yet their diverse coral communities bleach less than those on Palau's cooler outer reefs. Here, we combined genetic analyses, bleaching histories and growth rates of Porites cf. lobata colonies to identify thermally tolerant genotypes, map their distribution, and investigate potential growth trade-offs. We identified four genetic lineages of P. cf. lobata. On Palau's outer reefs, a thermally sensitive lineage dominates. The Rock Islands harbor two lineages with enhanced thermal tolerance; one of which shows no consistent growth trade-off and also occurs on several outer reefs. This suggests that the Rock Islands provide naturally tolerant larvae to neighboring areas. Finding and protecting such sources of thermally-tolerant corals is key to reef survival under 21st century climate change.

SUBMITTER: Rivera HE

PROVIDER: S-EPMC9772186 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature

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Palau's warmest reefs harbor thermally tolerant corals that thrive across different habitats.

Rivera Hanny E HE Cohen Anne L AL Thompson Janelle R JR Baums Iliana B IB Fox Michael D MD Meyer-Kaiser Kirstin S KS

Communications biology 20221221 1

Ocean warming is killing corals, but heat-tolerant populations exist; if protected, they could replenish affected reefs naturally or through restoration. Palau's Rock Islands experience consistently higher temperatures and extreme heatwaves, yet their diverse coral communities bleach less than those on Palau's cooler outer reefs. Here, we combined genetic analyses, bleaching histories and growth rates of Porites cf. lobata colonies to identify thermally tolerant genotypes, map their distribution ...[more]

PMID: 36543929

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Dataset Information

Palau's warmest reefs harbor thermally tolerant corals that thrive across different habitats.

Publications

Palau's warmest reefs harbor thermally tolerant corals that thrive across different habitats.

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