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Coral Bleaching


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Mass bleaching associated with unusually high sea temperatures represents one of the greatest threats to corals and coral reef ecosystems. Deeper reef areas are hypothesized as potential refugia, but the susceptibility of Scleractinian species over depth has not been quantified. During the most severe bleaching event on record, we found up to 83% of coral cover severely affected on Maldivian reefs at a depth of 3-5 m, but significantly reduced effects at 24-30 m. Analysis of 153 species' responses showed depth, shading and species identity had strong, significant effects on susceptibility. Overall, 73.3% of the shallow-reef assemblage had individuals at a depth of 24-30 m with reduced effects, potentially mitigating local extinction and providing a source of recruits for population recovery. Although susceptibility was phylogenetically constrained, species-level effects caused most lineages to contain some partially resistant species. Many genera showed wide variation between species, including Acropora, previously considered highly susceptible. Extinction risk estimates showed species and lineages of concern and those likely to dominate following repeated events. Our results show that deeper reef areas provide refuge for a large proportion of Scleractinian species during severe bleaching events and that the deepest occurring individuals of each population have the greatest potential to survive and drive reef recovery. [ABSTRACT FROM AUTHOR]
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Apr 10
Chris Athens
Chris Athens (Apr 10 2019 11:00AM) : 1. more

Most prevalent issue that coral reefs are facing.

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Apr 10
Chris Athens
Chris Athens (Apr 10 2019 11:00AM) : 2. more

Often caused by high water temperatures, so the reefs deeper down are much safer.

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Apr 10
Chris Athens
Chris Athens (Apr 10 2019 11:02AM) : 3. more

This will protect some species, but the species that only live in shallow water will most likely be effected.

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Copyright of Proceedings of the Royal Society B: Biological Sciences is the property of Royal Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Author Affiliations:
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Biodiversity, Queensland Museum, Townsville, Queensland 4811, Australia

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Global Change Institute

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Centre for Biodiversity and Conservation Science

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Reef Ecologic, Townsville, Queensland, Australia

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Centre for Biodiversity and Conservation Science, ARC Centre of Excellence for Environmental Decisions, University of Queensland, Brisbane, Queensland 4072, Australia

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Institute of Natural and Mathematical Sciences, Massey University, Palmerston North, Auckland 4474, New Zealand
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DMU Timestamp: March 29, 2019 18:11

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