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Community trait overdispersion due to trophic interactions : Concerns for assembly process inference

Författare:
  • Mikael Pontarp
  • Owen L. Petchey
Publiceringsår: 2016-10-12
Språk: Engelska
Sidor:
Publikation/Tidskrift/Serie: Proceedings of the Royal Society B: Biological Sciences
Volym: 283
Nummer: 1840
Dokumenttyp: Artikel i tidskrift
Förlag: Royal Society

Abstract english

The expected link between competitive exclusion and community trait overdispersion has been used to infer competition in local communities, and trait clustering has been interpreted as habitat filtering. Such community assembly process inference has received criticism for ignoring trophic interactions, as competition and trophic interactions might create similar trait patterns. While other theoretical studies have generally demonstrated the importance of predation for coexistence, ours provides the first quantitative demonstration of such effects on assembly process inference, using a trait-based ecological model to simulate the assembly of a competitive primary consumer community with and without the influence of trophic interactions. We quantified and contrasted trait dispersion/clustering of the competitive communities with the absence and presence of secondary consumers. Trophic interactions most often decreased trait clustering (i.e. increased dispersion) in the competitive communities due to evenly distributed invasions of secondary consumers and subsequent competitor extinctions over trait space. Furthermore, effects of trophic interactions were somewhat dependent on model parameters and clustering metric. These effects create considerable problems for process inference from trait distributions; one potential solution is to use more process-based and inclusive models in inference.

Keywords

  • Community assembly
  • Community structure
  • Process inference
  • Trait distribution
  • Trophic interactions

Other

Published
  • ISSN: 0962-8452
Mikael Pontarp
E-post: mikael [dot] pontarp [at] biol [dot] lu [dot] se

Forskare

Evolutionär ekologi

Sölvegatn 37, Lund

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