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Genomic data reveals habitat partitioning in massive Porites on Guam, Micronesia
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Genomic data reveals habitat partitioning in massive Porites on Guam, Micronesia
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Genomic data reveals habitat partitioning in massive Porites on Guam, Micronesia
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Journal Article
Genomic data reveals habitat partitioning in massive Porites on Guam, Micronesia
2024
Overview
Corals in marginal reef habitats generally exhibit less bleaching and associated mortality compared to nearby corals in more pristine reef environments. It is unclear, however, if these differences are due to environmental differences, including turbidity, or genomic differences between the coral hosts in these different environments. One particularly interesting case is in the coral genus
Porites
, which contains numerous morphologically similar massive
Porites
species inhabiting a wide range of reef habitats, from turbid river deltas and stagnant back reefs to high-energy fore reefs. Here, we generate ddRAD data for 172
Porites
corals from river delta and adjacent (<0.5 km) fore reef populations on Guam to assess the extent of genetic differentiation among massive
Porites
corals in these two contrasting environments and throughout the island. Phylogenetic and population genomic analyses consistently identify seven different clades of massive
Porites
, with the two largest clades predominantly inhabiting either river deltas or fore reefs, respectively. No population structure was detected in the two largest clades, and
Cladocopium
was the dominant symbiont genus in all clades and environments. The perceived bleaching resilience of corals in marginal reefs may therefore be attributed to interspecific differences between morphologically similar species, in addition to potentially mediating environmental differences. Marginal reef environments may therefore not provide a suitable refuge for many reef corals in a heating world, but instead host additional cryptic coral diversity.
