The importance of dispersal related and local factors in shaping the taxonomic structure of diatom metacommunities

To date, little is known about the relative importance of dispersal related versus local factors in shaping microbial metacommunities. A common criticism regarding existing datasets is that the level of taxonomic resolution might be too coarse to reliably assess microbial community structure and stu...

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Bibliographic Details
Published in:Oikos
Main Authors: Verleyen, Elie, Vyverman, Wim, Sterken, Mieke, Hodgson, Dominic A, De Wever, Aaike, Juggins, Steve, Van de Vijver, Bart, Jones, Viviene J, Vanormelingen, Pieter, Roberts, Donna, Flower, Roger, Kilroy, Cathy, Souffreau, Caroline, Sabbe, Koen
Format: Article in Journal/Newspaper
Language:English
Published: 2009
Subjects:
Biology and Life Sciences
COMMUNITY COMPOSITION
CLIMATE
CONTINENTAL ANTARCTIC LAKES
SPATIAL PROCESSES
SPECIES RICHNESS
MOUNTAIN LAKES
ECOLOGY
PATTERNS
DIVERSITY
FRESH-WATER
Antarctic
Antarc*
Antarctica
Online Access:https://biblio.ugent.be/publication/840622
http://hdl.handle.net/1854/LU-840622
https://doi.org/10.1111/j.1600-0706.2009.17575.x
https://biblio.ugent.be/publication/840622/file/850964
Description
Summary:To date, little is known about the relative importance of dispersal related versus local factors in shaping microbial metacommunities. A common criticism regarding existing datasets is that the level of taxonomic resolution might be too coarse to reliably assess microbial community structure and study biogeographical patterns. Moreover, few studies have assessed the importance of geographic distance between habitats, which may influence metacommunity dynamics through its effect on dispersal rates. We applied variation partitioning analyses to 15 separate regional datasets on diatoms found in lakes in Eurasia, Africa and Antarctica. These analyses quantified the relative contributions of dispersal related and local factors in determining patterns of taxonomic turnover at the species and at the genus level. In general, results were similar at both taxonomic levels. Local environmental factors accounted for most of the explained variation (median=21%), whereas dispersal related factors were much less important (median of significant fractions=5.5% variation explained) and failed to significantly explain any variation, independent of the environmental variables, in the majority of the datasets. However, the amount of variation explained by dispersal related factors increased with increasing geographic distance and increasing taxonomic resolution. We extrapolated our regional scale observations to the global scale by combining the regional datasets into a global dataset comprising 1039 freshwater lakes from both hemispheres and spanning a geographic distance of over 19 000 km. At this global scale, taxonomic turnover was lowest in highly connected habitats, once environmental factors were partialled out. In common with many other studies of macro-organisms, these analyses showed that both dispersal related and local variables significantly contribute to the structure of global lacustrine diatom communities.

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