| Host-symbiont recombination versus natural selection in the response of coral-dinoflagellate symbioses to environmental disturbance. | |
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MedLine Citation:
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PMID: 20444713 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Mutualisms between reef-building corals and endosymbiotic dinoflagellates are particularly sensitive to environmental stress, yet the ecosystems they construct have endured major oscillations in global climate. During the winter of 2008, an extreme cold-water event occurred in the Gulf of California that bleached corals in the genus Pocillopora harbouring a thermally 'sensitive' symbiont, designated Symbiodinium C1b-c, while colonies possessing Symbiodinium D1 were mostly unaffected. Certain bleached colonies recovered quickly while others suffered partial or complete mortality. In most colonies, no appreciable change was observed in the identity of the original symbiont, indicating that these partnerships are stable. During the initial phases of recovery, a third species of symbiont B1(Aiptasia), genetically identical to that harboured by the invasive anemone, Aiptasia sp., grew opportunistically and was visible as light-yellow patches on the branch tips of several colonies. However, this symbiont did not persist and was displaced in all cases by C1b-c several months later. Colonies with D1 were abundant at inshore habitats along the continental eastern Pacific, where seasonal turbidity is high relative to offshore islands. Environmental conditions of the central and southern coasts of Mexico were not sufficient to explain the exclusivity of D1 Pocillopora in these regions. It is possible that mass mortalities associated with major thermal disturbances during the 1997-1998 El Niño Southern Oscillation eliminated C1b-c holobionts from these locations. The differential loss of Pocillopora holobionts in response to thermal stress suggests that natural selection on existing variation can cause rapid and significant shifts in the frequency of particular coral-algal partnerships. However, coral populations may take decades to recover following episodes of severe selection, thereby raising considerable uncertainty about the long-term viability of these communities. |
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Authors:
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Todd C LaJeunesse; Robin Smith; Mariana Walther; Jorge Pinzón; Daniel T Pettay; Michael McGinley; Matthew Aschaffenburg; Pedro Medina-Rosas; Amilcar L Cupul-Magaña; Andrés López Pérez; Hector Reyes-Bonilla; Mark E Warner |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-05-05 |
Journal Detail:
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Title: Proceedings. Biological sciences / The Royal Society Volume: 277 ISSN: 1471-2954 ISO Abbreviation: Proc. Biol. Sci. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-08-27 Completed Date: 2011-01-13 Revised Date: 2012-04-27 |
Medline Journal Info:
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Nlm Unique ID: 101245157 Medline TA: Proc Biol Sci Country: England |
Other Details:
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Languages: eng Pagination: 2925-34 Citation Subset: IM |
Affiliation:
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Department of Biology, Pennsylvania State University, University Park, PA, USA. tcl3@psu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acclimatization
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genetics Animals Anthozoa / genetics* California Dinoflagellida / genetics* Environment* Geography Recombination, Genetic* Seasons Selection, Genetic* Species Specificity Stress, Physiological Symbiosis / genetics* Time Factors |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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