Holobiont Traits Shape Climate Change Responses in Cryptic Coral Lineages.

Autor: Grupstra CGB; Department of Biology, Boston University, Boston, Massachusetts, USA., Meyer-Kaiser KS; Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA., Bennett MJ; MARE, Guia Marine Laboratory, Faculty of Sciences, University of Lisbon, Cascais, Portugal., Andres MO; Palau International Coral Reef Center, Koror, Palau., Juszkiewicz DJ; Coral Conservation and Research Group (CORE), Trace and Environmental DNA Laboratory (TrEnD), School of Molecular and Life Sciences, Curtin University, Bentley, Western Australia, Australia., Fifer JE; Department of Biology, Boston University, Boston, Massachusetts, USA.; Department of Ecology, Evolution, and Marine Biology, University of California San Diego, San Diego, USA., Da-Anoy JP; Department of Biology, Boston University, Boston, Massachusetts, USA., Gomez-Campo K; Department of Biology, The Pennsylvania State University, University Park, Pennsylvania, USA., Martinez-Rugerio I; Department of Biology, The Pennsylvania State University, University Park, Pennsylvania, USA., Aichelman HE; Department of Biology, Boston University, Boston, Massachusetts, USA., Huzar AK; Department of Biology, Boston University, Boston, Massachusetts, USA.; Department of Integrative Biology, University of Texas at Austin, Austin, Texas, USA., Hughes AM; Department of Biology, Boston University, Boston, Massachusetts, USA.; Northeastern University Marine Science Center, Nahant, Massachusetts, USA., Rivera HE; Department of Biology, Boston University, Boston, Massachusetts, USA., Davies SW; Department of Biology, Boston University, Boston, Massachusetts, USA.
Jazyk: angličtina
Zdroj: Global change biology [Glob Chang Biol] 2024 Nov; Vol. 30 (11), pp. e17578.
DOI: 10.1111/gcb.17578
Abstrakt: As ocean warming threatens reefs worldwide, identifying corals with adaptations to higher temperatures is critical for conservation. Genetically distinct but morphologically similar (i.e. cryptic) coral populations can be specialized to extreme habitats and thrive under stressful conditions. These corals often associate with locally beneficial microbiota (Symbiodiniaceae photobionts and bacteria), obscuring the main drivers of thermal tolerance. Here, we leverage a holobiont (massive Porites) with high fidelity for C15 photobionts to investigate adaptive variation across classic ("typical" conditions) and extreme reefs characterized by higher temperatures and light attenuation. We uncovered three cryptic lineages that exhibit limited micro-morphological variation; one lineage dominated classic reefs (L1), one had more even distributions (L2), and a third was restricted to extreme reefs (L3). L1 and L2 were more closely related to populations ~4300 km away, suggesting that some lineages are widespread. All corals harbored Cladocopium C15 photobionts; L1 and L2 shared a photobiont pool that differed in composition between reef types, yet L3 mostly harbored unique photobiont strains not found in the other lineages. Assemblages of bacterial partners differed among reef types in lineage-specific ways, suggesting that lineages employ distinct microbiome regulation strategies. Analysis of light-harvesting capacity and thermal tolerance revealed adaptive variation underpinning survival in distinct habitats: L1 had the highest light absorption efficiency and lowest thermal tolerance, suggesting that it is a classic reef specialist. L3 had the lowest light absorption efficiency and the highest thermal tolerance, showing that it is an extreme reef specialist. L2 had intermediate light absorption efficiency and thermal tolerance, suggesting that is a generalist lineage. These findings reveal diverging holobiont strategies to cope with extreme conditions. Resolving coral lineages is key to understanding variation in thermal tolerance among coral populations, can strengthen our understanding of coral evolution and symbiosis, and support global conservation and restoration efforts.
(© 2024 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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