Community ecology of mesophotic coral reef ecosystems |
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Authors: | S E Kahng J R Garcia-Sais H L Spalding E Brokovich D Wagner E Weil L Hinderstein R J Toonen |
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Institution: | (1) College of Natural Sciences, Hawaii Pacific University, 41-202 Kalaniana’ole Highway, Waimanalo, HI 96795, USA;(2) Department of Marine Sciences, University of Puerto Rico, Mayaguez, P.O. Box 3424, Lajas, PR 00667, USA;(3) Botany Department, University of Hawai’i at Mānoa, 3190 Maile Way, Honolulu, HI 96822, USA;(4) Department of Zoology, Tel Aviv University, Ramat Aviv, Tel Aviv, Israel;(5) Department of Oceanography, University of Hawai’i at Mānoa, 1000 Pope Road, Honolulu, HI 96822, USA;(6) Department of Marine Sciences, University of Puerto Rico, P.O. Box 9000, Mayaguez, PR 00681, USA;(7) NOS/NCCOS/Center for Sponsored Coastal Ocean Research, National Oceanic and Atmospheric Administration, 1305 East-West Highway, Silver Spring, MD 20910, USA;(8) The Hawai’i Institute of Marine Biology, University of Hawai’i at Mānoa, Coconut Island, P.O. Box 1346, Kane’ohe, HI 96744, USA |
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Abstract: | Given the global degradation of shallow-water coral reef ecosystems resulting from anthropogenic activities, mesophotic coral
reef ecosystems (MCEs) are gaining attention because they are generally considered a de facto refuge for shallow-water species.
Despite their inferred importance, MCEs remain one of the most understudied reef habitats, and basic information on the taxonomic
composition, depth range, habitat preferences, and abundance and distribution of MCE taxa is scarce. The processes that structure
these communities are virtually unknown. Here, we provide a review of what is known about MCEs community ecology and outline
essential gaps in our knowledge of these deeper water coral reef ecosystems. The primary findings of this review are as follows:
(1) many dominant shallow-water species are absent from MCEs; (2) compared to shallow reefs, herbivores are relatively scarce,
perhaps due to limited habitat complexity at depth; (3) changes in the dominant photosynthetic taxa with depth suggest adaptation
and specialization to depth; (4) evidence regarding the importance of heterotrophy for zooxanthellate corals at depth is conflicting
and inconclusive; and (5) decreased light with depth, but not temperature, appears to be the primary factor limiting the depth
of MCEs. The majority of research done to date has been performed in the Caribbean, where some generalization can be made
about the community structure and distribution of MCEs. The larger and more diverse Indo-Pacific remains largely unexplored
with no apparent generalizations from the few sites that have been comparatively well studied. For MCEs, large gaps in knowledge
remain on fundamental aspects of ecology. Advanced technologies must be harnessed and logistical challenges overcome to close
this knowledge gap and empower resource managers to make informed decisions on conserving shallow-water and mesophotic coral
reef ecosystems. |
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