Bacterial metacommunity organization in a highly connected aquatic system

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http://hdl.handle.net/10138/214437

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Langenheder , S , Wang , J , Karjalainen , S M , Laamanen , T M , Tolonen , K T , Vilmi , A & Heino , J 2017 , ' Bacterial metacommunity organization in a highly connected aquatic system ' , FEMS Microbiology Ecology , vol. 93 , no. 4 , 225 . https://doi.org/10.1093/femsec/fiw225

Title: Bacterial metacommunity organization in a highly connected aquatic system
Author: Langenheder, Silke; Wang, Jianjun; Karjalainen, Satu Maaria; Laamanen, Tiina M.; Tolonen, Kimmo T.; Vilmi, Annika; Heino, Jani
Contributor: University of Helsinki, Department of Geosciences and Geography
Date: 2017-04
Language: eng
Number of pages: 9
Belongs to series: FEMS Microbiology Ecology
ISSN: 0168-6496
URI: http://hdl.handle.net/10138/214437
Abstract: The spatial structure and underlying assembly mechanisms of bacterial communities have been studied widely across aquatic systems, focusing primarily on isolated sites, such as different lakes, ponds and streams. Here, our main aim was to determine the underlying mechanisms for bacterial biofilm assembly within a large, highly connected lake system in Northern Finland using associative methods based on taxonomic and phylogenetic alpha-and beta-diversity and a large number of abiotic and biotic variables. Furthermore, null model approaches were used to quantify the relative importance of different community assembly processes. We found that spatial variation in bacterial communities within the lake was structured by different assembly processes, including stochasticity, species sorting and potentially even dispersal limitation. Species sorting by abiotic environmental conditions explained more of the taxonomic and particularly phylogenetic turnover in community composition compared with that by biotic variables. Finally, we observed clear differences in alpha diversity (species richness and phylogenetic diversity), which were to a stronger extent determined by abiotic compared with biotic factors, but also by dispersal effects. In summary, our study shows that the biodiversity of bacterial biofilm communities within a lake ecosystem is driven by within-habitat gradients in abiotic conditions and by stochastic and deterministic dispersal processes.
Subject: metacommunities
community assembly
lakes
biofilms
bacteria
alpha diversity
beta diversity
COMMUNITY ECOLOGY
BETA-DIVERSITY
BACTERIOPLANKTON COMMUNITIES
STOCHASTIC-PROCESSES
ASSEMBLY PROCESSES
NULL MODELS
PATTERNS
BIOFILMS
SCALES
DISSIMILARITY
1183 Plant biology, microbiology, virology
1172 Environmental sciences
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