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Productivity links morphology, symbiont specificity and bleaching in the evolution of Caribbean octocoral symbioses

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dc.contributor.author Baker, David M. en
dc.contributor.author Freeman, Christopher J. en
dc.contributor.author Knowlton, Nancy en
dc.contributor.author Thacker, Robert W. en
dc.contributor.author Kim, Kiho en
dc.contributor.author Fogel, Marilyn L. en
dc.date.accessioned 2015-06-01T12:28:46Z
dc.date.available 2015-06-01T12:28:46Z
dc.date.issued 2015
dc.identifier.citation Baker, David M., Freeman, Christopher J., Knowlton, Nancy, Thacker, Robert W., Kim, Kiho, and Fogel, Marilyn L. 2015. "<a href="https://repository.si.edu/handle/10088/26514">Productivity links morphology, symbiont specificity and bleaching in the evolution of Caribbean octocoral symbioses</a>." <em>The ISME journal</em>. 9:2620&ndash;2629. <a href="https://doi.org/10.1038/ismej.2015.71">https://doi.org/10.1038/ismej.2015.71</a> en
dc.identifier.issn 1751-7362
dc.identifier.uri http://hdl.handle.net/10088/26514
dc.description.abstract Many cnidarians host endosymbiotic dinoflagellates from the genus Symbiodinium. It is generally assumed that the symbiosis is mutualistic, where the host benefits from symbiont photosynthesis while providing protection and photosynthetic substrates. Diverse assemblages of symbiotic gorgonian octocorals can be found in hard bottom communities throughout the Caribbean. While current research has focused on the phylo- and population genetics of gorgonian symbiont types and their photo-physiology, relatively less work has focused on biogeochemical benefits conferred to the host and how these benefits vary across host species. Here we examine this symbiosis among 11 gorgonian species collected in Bocas del Toro, Panama. By coupling light and dark bottle incubations (P/R) with (13)C-bicarbonate tracers, we quantified the link between holobiont oxygen metabolism with carbon assimilation and translocation from symbiont to host. Our data show that P/R varied among species, and was correlated with colony morphology and polyp size. Sea fans and sea plumes were net autotrophs (P/R&gt;1.5), while nine species of sea rods were net heterotrophs with most below compensation (P/R&lt;1.0). (13)C assimilation corroborated the P/R results, and maximum d(13)Chost values were strongly correlated with polyp size, indicating higher productivity by colonies with high polyp SA:V. A survey of gorgonian-Symbiodinium associations revealed that productive species maintain specialized, obligate symbioses and are more resistant to coral bleaching, whereas generalist and facultative associations are common among sea rods that have higher bleaching sensitivities. Overall, productivity and polyp size had strong phylogenetic signals with carbon fixation and polyp size showing evidence of trait covariance.The ISME Journal advance online publication, 19 May 2015; doi:10.1038/ismej.2015.71. en
dc.relation.ispartof The ISME journal en
dc.title Productivity links morphology, symbiont specificity and bleaching in the evolution of Caribbean octocoral symbioses en
dc.type Journal Article en
dc.identifier.srbnumber 136074
dc.identifier.doi 10.1038/ismej.2015.71
rft.jtitle The ISME journal
rft.volume 9
rft.spage 2620
rft.epage 2629
dc.description.SIUnit NH-SMS en
dc.description.SIUnit NMNH en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 2620
dc.citation.epage 2629

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