DOI: 10.1111/gcb.13250
论文题名: Host adaptation and unexpected symbiont partners enable reef-building corals to tolerate extreme temperatures
作者: Howells E.J. ; Abrego D. ; Meyer E. ; Kirk N.L. ; Burt J.A.
刊名: Global change biology
ISSN: 13652486
出版年: 2016
卷: 22, 期: 8 起始页码: 2702
结束页码: 2714
语种: 英语
英文关键词: Arabian Gulf
; brain coral
; climate change
; Persian Gulf
; Platygyra daedalea
; Sea of Oman
; Symbiodinium
; zooxanthellae
Scopus关键词: acclimation
; adaptation
; climate change
; coral reef
; host
; symbiont
; temperature effect
; temperature tolerance
; adaptation
; animal
; Anthozoa
; coral reef
; growth, development and aging
; Indian Ocean
; physiology
; symbiosis
; temperature
; Adaptation, Biological
; Animals
; Anthozoa
; Coral Reefs
; Indian Ocean
; Symbiosis
; Temperature
; Arabian Sea
; Indian Ocean
; Persian Gulf
; algae
; Animalia
; Anthozoa
; Platygyra daedalea
; Symbiodinium
英文摘要: Understanding the potential for coral adaptation to warming seas is complicated by interactions between symbiotic partners that define stress responses and the difficulties of tracking selection in natural populations. To overcome these challenges, we characterized the contribution of both animal host and symbiotic algae to thermal tolerance in corals that have already experienced considerable warming on par with end-of-century projections for most coral reefs. Thermal responses in Platygyra daedalea corals from the hot Persian Gulf where summer temperatures reach 36°C were compared with conspecifics from the milder Sea of Oman. Persian Gulf corals had higher rates of survival at elevated temperatures (33 and 36°C) in both the nonsymbiotic larval stage (32-49% higher) and the symbiotic adult life stage (51% higher). Additionally, Persian Gulf hosts had fixed greater potential to mitigate oxidative stress (31-49% higher) and their Symbiodinium partners had better retention of photosynthetic performance under elevated temperature (up to 161% higher). Superior thermal tolerance of Persian Gulf vs. Sea of Oman corals was maintained after 6-month acclimatization to a common ambient environment and was underpinned by genetic divergence in both the coral host and symbiotic algae. In P. daedalea host samples, genomewide SNP variation clustered into two discrete groups corresponding with Persian Gulf and Sea of Oman sites. Symbiodinium within host tissues predominantly belonged to ITS2 rDNA type C3 in the Persian Gulf and type D1a in the Sea of Oman contradicting patterns of Symbiodinium thermal tolerance from other regions. Our findings provide evidence that genetic adaptation of both host and Symbiodinium has enabled corals to cope with extreme temperatures in the Persian Gulf. Thus, the persistence of coral populations under continued warming will likely be determined by evolutionary rates in both, rather than single, symbiotic partners. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61338
Appears in Collections: 影响、适应和脆弱性
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作者单位: Center for Genomics and Systems Biology, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates; Department of Natural Science and Public Health, Zayed University, P.O. Box 144534, Abu Dhabi, United Arab Emirates; Department of Integrative Biology, Oregon State University, 3029 Cordley Hall, Corvallis, OR 97331, USA
Recommended Citation:
Howells E.J.,Abrego D.,Meyer E.,et al. Host adaptation and unexpected symbiont partners enable reef-building corals to tolerate extreme temperatures[J]. Global change biology,2016-01-01,22(8)