The influence of surface soil physicochemistry on the edaphic bacterial communities in contrasting terrain types of the Central Namib Desert

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dc.contributor.author Gombeer, S.
dc.contributor.author Ramond, Jean-Baptiste
dc.contributor.author Eckardt, Frank
dc.contributor.author Seely, Mary
dc.contributor.author Cowan, Don A.
dc.date.accessioned 2015-08-03T05:02:45Z
dc.date.available 2015-08-03T05:02:45Z
dc.date.issued 2015-09
dc.description.abstract Notwithstanding, the severe environmental conditions, deserts harbour a high diversity of adapted micro-organisms. In such oligotrophic environments, soil physicochemical characteristics play an important role in shaping indigenous microbial communities. This study investigates the edaphic bacterial communities of three contrasting desert terrain types (gravel plains, sand dunes and ephemeral rivers) with different surface geologies in the Central Namib Desert. For each site, we evaluated surface soil physicochemistries and used explorative T-RFLP methodology to get an indication of bacterial community diversities. While grain size was an important parameter in separating the three terrain types physicochemically and specific surface soil types could be distinguished, the desert edaphic bacterial communities displayed a high level of local spatial heterogeneity. Ten variables contributed significantly (P < 0.05) to the variance in the T-RFLP data sets: fine silt, medium and fine sand content, pH, S, Na, Zn, Al, V and Fe concentrations, and 40% of the total variance could be explained by these constraining variables. The results suggest that local physicochemical conditions play a significant role in shaping the bacterial structures in the Central Namib Desert and stress the importance of recording a wide variety of environmental descriptors to comprehensively assess the role of edaphic parameters in shaping microbial communities. en_ZA
dc.description.embargo 2016-09-30 en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship University of Pretoria and the South African National Research Foundation (NRF). en_ZA
dc.description.uri http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1472-4669 en_ZA
dc.identifier.citation Gombeer, S, Ramond, JB, Eckardt, FD, Seely, M & Cowan, DA 2015, 'The influence of surface soil physicochemistry on the edaphic bacterial communities in contrasting terrain types of the Central Namib Desert', Geobiology, vol. 13, no. 5, pp. 494-505. en_ZA
dc.identifier.issn 1472-4677 (print)
dc.identifier.issn 1472-4669 (online)
dc.identifier.other 10.1111/gbi.12144
dc.identifier.uri http://hdl.handle.net/2263/49213
dc.language.iso en en_ZA
dc.publisher Wiley en_ZA
dc.rights © John Wiley & Sons Ltd. This is the pre-peer reviewed version of the following article : The influence of surface soil physicochemistry on the edaphic bacterial communities in contrasting terrain types of the Central Namib Desert, Geobiology, vol. 13, no. 5, pp. 494-505, 2015. doi : 10.1111/gbi.12144. The definite version is available at : http://onlinelibrary.wiley.comjournal/10.1111/(ISSN)1472-4669. en_ZA
dc.subject Influence of surface soil en_ZA
dc.subject Physicochemistry en_ZA
dc.subject Edaphic bacterial communities en_ZA
dc.subject Contrasting terrain types en_ZA
dc.subject Central Namib Desert en_ZA
dc.title The influence of surface soil physicochemistry on the edaphic bacterial communities in contrasting terrain types of the Central Namib Desert en_ZA
dc.type Postprint Article en_ZA


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