期刊
MARINE ECOLOGY PROGRESS SERIES
卷 420, 期 -, 页码 91-101出版社
INTER-RESEARCH
DOI: 10.3354/meps08866
关键词
Porites compressa; Montipora capitata; Coral bleaching; Resilience; Stable isotope; Heterotrophy; Photoautotrophy
资金
- National Science Foundation in Biological Oceanography [0542479]
- National Science Foundation [0542415, 0610487]
- Mellon Foundation
- Division Of Ocean Sciences [0825490] Funding Source: National Science Foundation
- Natural Environment Research Council [dml010007] Funding Source: researchfish
- NERC [dml010007] Funding Source: UKRI
Reef-forming corals cycle carbon (C) between the coral host, their endosymbiotic algae, and their skeleton. At elevated sea-surface temperatures this relationship breaks down and the corals bleach by expelling their endosymbiotic algae or these algae lose their photosynthetic pigments. The effect of thermally induced bleaching on the C cycling of 2 ecologically important coral species was investigated. The acquisition and assimilation of photoautotrophically and heterotrophically acquired C was examined via pulse-chase labeling experiments in thermally bleached and non-bleached Montipora capitata and Porites compressa corals. In non-bleached corals photoautotrophic and heterotrophic C were acquired and assimilated very differently. Namely, photoautotrophically acquired C was used to meet short-term metabolic demands and calcification, whereas heterotrophically acquired C was retained in both the coral host and endosymbiotic algae. In bleached corals there was a dramatic reduction in the assimilation of photoautotrophically acquired C by the endosymbiotic algae, in the translocation of C from the algae to the coral host, and in the C assimilated in the skeleton. The level of heterotrophically acquired C assimilated into bleached corals was similar to that in non-bleached corals, and was a direct source of organic C to the endosymbiotic algae. This host-to-endosymbiotic algal supply of heterotrophic C may stimulate endosymbiotic algal recovery. These findings show the importance of both photoautotrophic and heterotrophic C to coral function and demonstrate that both play a crucial role in the recovery from bleaching.
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