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Biogeography of bacterial communities exposed to progressive long-term environmental change


Logares, R and Lindstrom, ES and Langenheder, S and Logue, JB and Paterson, H and Laybourn-Parry, J and Rengefors, K and Tranvik, L and Bertilsson, S, Biogeography of bacterial communities exposed to progressive long-term environmental change, The ISME Journal, 7 pp. 937-948. ISSN 1751-7362 (2013) [Refereed Article]

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Copyright 2013 International Society for Microbial Ecology Licensed under Creative Commons Attribution-NonCommercial- NoDerivs 3.0 Unported (CC BY-NC-ND 3.0)

DOI: doi:10.1038/ismej.2012.168


The response of microbial communities to long-term environmental change is poorly understood. Here, we study bacterioplankton communities in a unique system of coastal Antarctic lakes that were exposed to progressive long-term environmental change, using 454 pyrosequencing of the 16S rDNA gene (V3–V4 regions). At the time of formation, most of the studied lakes harbored marinecoastal microbial communities, as they were connected to the sea. During the past 20 000 years, most lakes isolated from the sea, and subsequently they experienced a gradual, but strong, salinity change that eventually developed into a gradient ranging from freshwater (salinity 0) to hypersaline (salinity 100). Our results indicated that present bacterioplankton community composition was strongly correlated with salinity and weakly correlated with geographical distance between lakes. A few abundant taxa were shared between some lakes and coastal marine communities. Nevertheless, lakes contained a large number of taxa that were not detected in the adjacent sea. Abundant and rare taxa within saline communities presented similar biogeography, suggesting that these groups have comparable environmental sensitivity. Habitat specialists and generalists were detected among abundant and rare taxa, with specialists being relatively more abundant at the extremes of the salinity gradient. Altogether, progressive long-term salinity change appears to have promoted the diversification of bacterioplankton communities by modifying the composition of ancestral communities and by allowing the establishment of new taxa.

Item Details

Item Type:Refereed Article
Keywords:Antarctica; Bacteria; environmental change; long-term; pyrosequencing; salinity
Research Division:Biological Sciences
Research Group:Microbiology
Research Field:Microbial ecology
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Biodiversity in Antarctic and Southern Ocean environments
UTAS Author:Paterson, H (Dr Harriet Paterson)
ID Code:89595
Year Published:2013
Web of Science® Times Cited:239
Deposited By:IMAS Research and Education Centre
Deposited On:2014-03-07
Last Modified:2014-06-17
Downloads:411 View Download Statistics

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