Mass effects meet species sorting: transformations of microbial assemblages in epiphreatic subsurface karst water pools

Citation

Material Information

Title:
Mass effects meet species sorting: transformations of microbial assemblages in epiphreatic subsurface karst water pools
Series Title:
Environmental Microbiology
Creator:
Shabarova,Tanja
Pernthale, Jakob
Widmer, Franco
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Microbial Communities ( local )
Methylophilaceae ( local )
Comamonadaceae ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
We investigated the transformations of the microbial communities in epiphreatic karst cave pools with different flooding frequencies. Fingerprinting of 16S rRNA genes was combined with microscopic and sequence analysis to examine if source water would transport comparable microbial inocula into the pools at consecutive flood events, and to assess possible effects of residence time on the microbial assemblages during stagnant periods. Variability in the concentrations of dissolved organic carbon and conductivity indicated differences between floods and changes of pool water over time. High numbers of Betaproteobacteria affiliated with Methylophilaceae and Comamonadaceae were introduced into the pools during floodings. While the former persisted in the pools, the latter exhibited considerable microdiversification. These Betaproteobacteria might thus represent core microbial groups in karst water. A decrease in the estimated total diversity of the remaining bacterial taxa was apparent after a few weeks of residence: Some were favoured by stagnant conditions, whereas the majority was rapidly outcompeted. Thus, the microbial communities consisted of different components governed by complementary assembly mechanisms (dispersal versus environmental filtering) upon introduction into the pools. High overlap of temporary and persistent community members between samplings from two winters, moreover, reflected the seasonal recurrence of the studied microbial assemblages.
Original Version:
Environmental Microbiology, Vol. 15, no. 9 (2013-03-28).

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University of South Florida Library
Holding Location:
University of South Florida
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This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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University of South Florida
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