Abstract
Background: Mesophotic coral communities are increasingly gaining attention for the unique biological diversity they host, exemplified by the numerous mesophotic fish species that continue to be discovered. In contrast, many of the photosynthetic scleractinian corals observed at mesophotic depths are assumed to be depth-generalists, with very few species characterised as mesophotic-specialists. This presumed lack of a specialised community remains largely untested, as phylogenetic studies on corals have rarely included mesophotic samples and have long suffered from resolution issues associated with traditional sequence markers. Results: Here, we used reduced-representation genome sequencing to conduct a phylogenomic assessment of the two dominant mesophotic genera of plating corals in the Indo-Pacific and Western Atlantic, respectively, Leptoseris and Agaricia. While these genome-wide phylogenies broadly corroborated the morphological taxonomy, they also exposed deep divergences within the two genera and undescribed diversity across the current taxonomic species. Five of the eight focal species consisted of at least two sympatric and genetically distinct lineages, which were consistently detected across different methods. Conclusions: The repeated observation of genetically divergent lineages associated with mesophotic depths highlights that there may be many more mesophotic-specialist coral species than currently acknowledged and that an urgent assessment of this largely unstudied biological diversity is warranted.
Original language | English |
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Article number | 147 |
Journal | BMC Biology |
Volume | 21 |
Issue number | 1 |
DOIs | |
State | Published - 26 Jun 2023 |
Bibliographical note
Publisher Copyright:© 2023, The Author(s).
Funding
We thank for logistical support: CARMABI Research Station, Substation Curaçao, CIEE Bonaire Research Station, STINAPA Bonaire, CORALINA, PNN “Corales de Profundidad”, Hawaii Undersea Research Laboratory (HURL), Reef Connections, Mike Ball Dive Expeditions, SY Ethereal, and Waitt Foundation. This work was funded by the XL Catlin Seaview Survey (funded by the XL Catlin Group in partnership with Underwater Earth and The University of Queensland), “The Explorers Club—Eddie Bauer Grant for Expeditions”, an Australian Research Council Discovery Early Career Researcher Award (DE160101433), and the Hope for Reefs Initiative at the California Academy of Sciences.
Funders | Funder number |
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CARMABI | |
Hawaii Undersea Research Laboratory | |
Hope for Reefs Initiative | |
XL Catlin Seaview Survey | |
Waitt Foundation | |
California Academy of Sciences | |
Australian Research Council | DE160101433 |
University of Queensland |
Keywords
- Biodiversity
- Depth-differentiation
- Mesophotic
- Phylogenetics
- Scleractinia