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Cryptic diversity of the symbiotic cyanobacterium Synechococcus spongiarum among sponge hosts

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dc.contributor.author Erwin, Patrick M. en
dc.contributor.author Thacker, Robert W. en
dc.date.accessioned 2011-02-09T20:02:58Z
dc.date.available 2011-02-09T20:02:58Z
dc.date.issued 2008
dc.identifier.citation Erwin, Patrick M. and Thacker, Robert W. 2008. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F11882">Cryptic diversity of the symbiotic cyanobacterium Synechococcus spongiarum among sponge hosts</a>." <em>Molecular ecology</em>. 17 (12):2937&ndash;2947. <a href="https://doi.org/10.1111/j.1365-294X.2008.03808.x">https://doi.org/10.1111/j.1365-294X.2008.03808.x</a> en
dc.identifier.issn 0962-1083
dc.identifier.uri http://hdl.handle.net/10088/11882
dc.description.abstract Abstract Cyanobacteria are common members of sponge-associated bacterial communities and are particularly abundant symbionts of coral reef sponges. The unicellular cyanobacterium Synechococcus spongiarum is the most prevalent photosynthetic symbiont in marine sponges and inhabits taxonomically diverse hosts from tropical and temperate reefs worldwide. Despite the global distribution of S. spongiarum, molecular analyses report low levels of genetic divergence among 16S ribosomal RNA (rRNA) gene sequences from diverse sponge hosts, resulting either from the widespread dispersal ability of these symbionts or the low phylogenetic resolution of a conserved molecular marker. Partial 16S rRNA and entire 16S-23S rRNA internal transcribed spacer (ITS) genes were sequenced from cyanobacteria inhabiting 32 sponges (representing 18 species, six families and four orders) from six geographical regions. ITS phylogenies revealed 12 distinct clades of S. spongiarum that displayed 9% mean sequence divergence among clades and less than 1% sequence divergence within clades. Symbiont clades ranged in specificity from generalists to specialists, with most (10 of 12) clades detected in one or several closely related hosts. Although multiple symbiont clades inhabited some host sponges, symbiont communities appear to be structured by both geography and host phylogeny. In contrast, 16S rRNA sequences were highly conserved, exhibiting less than 1% sequence divergence among symbiont clades. ITS gene sequences displayed much higher variability than 16S rRNA sequences, highlighting the utility of ITS sequences in determining the genetic diversity and host specificity of S. spongiarum populations among reef sponges. The genetic diversity of S. spongiarum revealed by ITS sequences may be correlated with different physiological capabilities and environmental preferences that may generate variable host-symbiont interactions. en
dc.relation.ispartof Molecular ecology en
dc.title Cryptic diversity of the symbiotic cyanobacterium Synechococcus spongiarum among sponge hosts en
dc.type Journal Article en
dc.identifier.srbnumber 74264
dc.identifier.doi 10.1111/j.1365-294X.2008.03808.x
rft.jtitle Molecular ecology
rft.volume 17
rft.issue 12
rft.spage 2937
rft.epage 2947
dc.description.SIUnit Bocas del Toro en
dc.description.SIUnit Caribbean Sea en
dc.description.SIUnit Marine biology en
dc.description.SIUnit Encyclopedia of Life en
dc.description.SIUnit Forces of Change en
dc.description.SIUnit coral reef en
dc.description.SIUnit cyanobacteria en
dc.description.SIUnit STRI en
dc.citation.spage 2937
dc.citation.epage 2947

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