期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 220, 期 7, 页码 1192-1196出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.148239
关键词
Symbiodinium; Montastraea cavernosa; Coral bleaching; Symbiosis
类别
资金
- National Science Foundation (NSF) Graduate Research Fellowships and University of Miami Fellowships
- RSMAS Alumni Award
- Captain Harry D. Vernon Memorial Scholarship
- Garden Club of America Ecological Restoration Fellowship
- Reitmeister Award
- Rowlands Research Fellowship
- NSF [OCE-0547169, OCE-1358699]
- Wildlife Conservation Society
- Lenfest Ocean Program and a Pew Fellowship in Marine Conservation (Pew Charitable Trusts)
- Direct For Biological Sciences
- Div Of Biological Infrastructure [1400787] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1358699] Funding Source: National Science Foundation
Reef corals are sensitive to thermal stress, which induces coral bleaching ( the loss of algal symbionts), often leading to coral mortality. However, corals hosting certain symbionts ( notably some members of Symbiodinium clade D) resist bleaching when exposed to high temperatures. To determine whether these symbionts are also cold tolerant, we exposed corals hosting either Symbiodinium C3 or D1a to incremental warming (+1 degrees C week(-1) to 35 degrees C) and cooling (-1 degrees C week-1 to 15 degrees C), and measured photodamage and symbiont loss. During warming to 33 degrees C, C3 corals were photodamaged and lost > 99% of symbionts, while D1a corals experienced photodamage but did not bleach. During cooling, D1a corals suffered more photodamage than C3 corals but still did not bleach, while C3 corals lost 94% of symbionts. These results indicate that photodamage does not always lead to bleaching, suggesting alternate mechanisms exist by which symbionts resist bleaching, and helping explain the persistence of D1a symbionts on recently bleached reefs, with implications for the future of these ecosystems.
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