期刊
CORAL REEFS
卷 40, 期 3, 页码 907-920出版社
SPRINGER
DOI: 10.1007/s00338-021-02095-w
关键词
Refuge; Physiology; Thermal performance curves; Thermal optimum; Bermuda; Climate change
资金
- BIOS' Grant-in-Aid Fellowship Award
- National Science Foundation [1737071, 1937770]
- BIOS REU by the National Science Foundation's Diversity of Ocean Sciences [1757475]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1937770] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Ocean Sciences [1757475] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1737071] Funding Source: National Science Foundation
The study compared the thermal sensitivities of four common coral species between shallow and upper-mesophotic reefs in Bermuda, finding that there were no differences in thermal sensitivity between depths, suggesting that local adaptation and/or acclimatization may not be occurring. Upper-mesophotic corals in Bermuda do not have lower bleaching thresholds than shallow water conspecifics, but exhibit similar thermal sensitivities, supporting the potential for mesophotic coral ecosystems to function as a thermal refuge.
The physiology of ectotherms living in marine environments is strongly influenced by their local thermal experience. Scleractinian corals living near their thermal optimums are increasingly vulnerable to bleaching and mortality as oceanic heat waves increase globally. Mesophotic coral ecosystems (MCEs) below 30 m depths are characteristically cooler than adjacent shallow water reefs, which according to theory should result in differential metabolic responses to temperature between depths. How local temperatures influence physiological responses in mesophotic corals is poorly understood. We compared thermal sensitivities of four coral species between a shallow (5-10 m) and upper-mesophotic (30-35 m) reef in Bermuda. Thermal performance curves (TPC) were measured in laboratory mesocosms for four common coral species (Diploria labyrinthiformis, Orbicella franksi, Montastraea cavernosa andPorites astreoides) across a wide range of temperatures (19-36). Our results indicate that the maximum rate of gross photosynthetic (GP) performance (GP-P-max) and the mean overall photosynthetic rates (GP-lnc) varied significantly among species. In contrast, thermal sensitivity (P-max, T-opt, lnc, E, Eh, or Th) did not vary between depths for conspecifics except for deactivation energy (GP-Eh) in D. labyrinthiformis. Additionally, gross respiration (R) did not differ among species or between depths for any thermal metric. Similar metabolic responses between depths suggest that local adaptation and/or acclimatization to different thermal conditions is likely not occurring. Instead, upper-mesophotic corals in Bermuda do not have lower bleaching thresholds than shallow water conspecifics, but similar thermal sensitivities supporting the potential for MCEs to function as a thermal refuge.
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