Evidence for successional development in Antarctic hypolithic bacterial communities

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dc.contributor.author Makhalanyane, Thulani P.
dc.contributor.author Valverde, Angel
dc.contributor.author Cary, Stephen Craig
dc.contributor.author Birkeland, Nils-Kare
dc.contributor.author Tuffin, Marla I.
dc.contributor.author Cowan, Don A.
dc.date.accessioned 2014-11-03T12:34:19Z
dc.date.available 2014-11-03T12:34:19Z
dc.date.issued 2013-11
dc.description.abstract Hypoliths (cryptic microbial assemblages that develop on the undersides of translucent rocks) are significant contributors to regional C and N budgets in both hot and cold deserts. Previous studies in the Dry Valleys of Eastern Antarctica have reported three morphologically distinct hypolithic community types: cyanobacteria dominated (type I), fungus dominated (type II) and moss dominated (type III). Here we present terminal-restriction fragment length polymorphism analyses to elucidate the bacterial community structure in hypolithons and the surrounding soils. We show clear and robust distinction in bacterial composition between bulk surface soils and hypolithons. Moreover, the bacterial assemblages were similar in types II and III hypolithons and clearly distinct from those found in type I. Through 16S rRNA gene 454 pyrosequencing, we show that Proteobacteria dominated all three types of hypolithic communities. As expected, Cyanobacteria were more abundant in type I hypolithons, whereas Actinobacteria were relatively more abundant in types II and III hypolithons, and were the dominant group in soils. Using a probabilistic dissimilarity metric and random sampling, we demonstrate that deterministic processes are more important in shaping the structure of the bacterial community found in types II and III hypolithons. Most notably, the data presented in this study suggest that hypolithic bacterial communities establish via a successional model, with the type I hypolithons acting as the basal development state. en_US
dc.description.librarian hb2014 en_US
dc.description.sponsorship National Research Foundation (South Africa), the Research Council of Norway (the South Africa Program; grant no. 180352) and the University of the Western Cape. en_US
dc.description.uri http://www.nature.com/ismej/journal/ en_US
dc.identifier.citation Makhalanyane, TP, Valverde, A, Birkeland, NK, Cary, SC, Tuffin, IM & Cowan, DA 2013, 'Evidence for successional development in Antarctic hypolithic bacterial communities', ISME Journal, vol. 7, no. 11, pp. 2080-2090. en_US
dc.identifier.issn 1751-7362 (print)
dc.identifier.issn 1751-7370 (online)
dc.identifier.other 10.1038/ismej.2013.94
dc.identifier.uri http://hdl.handle.net/2263/42467
dc.language.iso en en_US
dc.publisher Nature Publishing Group en_US
dc.rights © 2013 International Society for Microbial Ecology en_US
dc.subject Antarctica en_US
dc.subject Community assembly en_US
dc.subject Hypoliths en_US
dc.subject Pyrosequencing en_US
dc.subject Soil en_US
dc.subject Succession en_US
dc.subject T-RFLP en_US
dc.title Evidence for successional development in Antarctic hypolithic bacterial communities en_US
dc.type Postprint Article en_US


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