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Primary assembly of soil communities: disentangling the effect of dispersal and local environment.

Author:
  • Maria Ingimarsdottir
  • Tancredi Caruso
  • Jörgen Ripa
  • Olöf Birna Magnúsdóttir
  • Massimo Migliorini
  • Katarina Hedlund
Publishing year: 2012
Language: English
Pages: 745-754
Publication/Series: Oecologia
Volume: 170
Issue: 3
Document type: Journal article
Publisher: Springer

Abstract english

It has long been recognised that dispersal abilities and environmental factors are important in shaping invertebrate communities, but their relative importance for primary soil community assembly has not yet been disentangled. By studying soil communities along chronosequences on four recently emerged nunataks (ice-free land in glacial areas) in Iceland, we replicated environmental conditions spatially at various geographical distances. This allowed us to determine the underlying factors of primary community assembly with the help of metacommunity theories that predict different levels of dispersal constraints and effects of the local environment. Comparing community assembly of the nunataks with that of non-isolated deglaciated areas indicated that isolation of a few kilometres did not affect the colonisation of the soil invertebrates. When accounting for effects of geographical distances, soil age and plant richness explained a significant part of the variance observed in the distribution of the oribatid mites and collembola communities, respectively. Furthermore, null model analyses revealed less co-occurrence than expected by chance and also convergence in the body size ratio of co-occurring oribatids, which is consistent with species sorting. Geographical distances influenced species composition, indicating that the community is also assembled by dispersal, e.g. mass effect. When all the results are linked together, they demonstrate that local environmental factors are important in structuring the soil community assembly, but are accompanied with effects of dispersal that may "override" the visible effect of the local environment.

Keywords

  • Ecology
  • Zoology
  • Collembola
  • Colonisation
  • Metacommunity
  • Oribatida
  • Variance partitioning

Other

Published
  • BECC
  • ISSN: 1432-1939
Katarina Hedlund
E-mail: katarina [dot] hedlund [at] biol [dot] lu [dot] se

Professor

Biodiversity

+46 46 222 37 98

+46 72 562 10 04

E-A321

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Researcher

Centre for Environmental and Climate Research (CEC)

+46 46 222 37 98

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden