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Disentangling the processes driving the biogeography of freshwater diatoms: a multiscale approach

Keck, Francois and Franc, Alain and Kahlert, Maria (2018). Disentangling the processes driving the biogeography of freshwater diatoms: a multiscale approach. Journal of biogeography. 45 :7 , 1582-1592
[Research article]

[img] PDF - Accepted Version

Official URL: https://doi.org/10.1111/jbi.13239


1. To disentangle the effects of local environmental conditions and space at multiple scales in order to uncover and explain biogeographical signals in microbial communities of freshwater diatoms.
2. To assess the role of species traits related to dispersal capacities in diatom biogeography.

Rivers and streams of Sweden sampled over a total area of 450,000km(2).

We used partial redundancy analyses and variation partitioning coupled with spatial eigenfunctions analyses to separate the effects of environment and space at three different scales on diatoms community structure. As community analyses might give limited insight into species-specific mechanisms, we also performed species by species variation partitioning and the amount of variance explained by each fraction was related to species cell length and attachment to the substrate.
We found a strong effect of environment and space at a large scale suggesting environmental filtering and dispersal limitation over large distances. Additionally, species-based analyses uncovered an effect of space at fine scale suggesting possible species-specific mass effect dynamic or species sorting driven by missing environmental factors varying at fine scale. Environmental and spatial effects varied strongly among species, but this variation was not explained by cell length and attachment to the substrate.
Main conclusions
Our results confirm the importance of both environment and dispersal-related processes in controlling diatom community structure and bring new perspectives on the role of dispersal in shaping microbial communities at biogeographical scale. Dispersal being a species-specific mechanism, species associations are not necessarily conserved from site to site and species-based approaches can detect different spatial patterns than those derived from traditional community analyses. Contrary to the conclusions of small-scale analysis of connected metacommunities, interspecific trait variation seems to be of limited importance for long-distance overland dispersal in diatoms.

Authors/Creators:Keck, Francois and Franc, Alain and Kahlert, Maria
Title:Disentangling the processes driving the biogeography of freshwater diatoms: a multiscale approach
Series Name/Journal:Journal of biogeography
Year of publishing :2018
Page range:1582-1592
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:biogeography, diatoms, dispersal limitation, environmental response, mass effect, multiscale, multivariate spatial analysis, traits
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Additional ID:
Type of IDID
ID Code:15607
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:18 Sep 2018 11:28
Metadata Last Modified:09 Sep 2020 14:17

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