Competitive interactions change the pattern of species co-occurrences under neutral dispersal

Ulrich, W. ; Jabot, F. ; Gotelli, N.J.

Type de document
Article de revue scientifique à comité de lecture
Langue
Anglais
Affiliation de l'auteur
NICOLAUS COPERNICUS UNIVERSITY CHAIR OF ECOLOGY AND BIOGEOGRAPHY TORUN POL ; IRSTEA CLERMONT FERRAND UR LISC FRA ; UNIVERSITY OF VERMONT BURLINGTON USA
Année
2016
Résumé / Abstract
Non-random patterns of species segregation and aggregation within ecological communities are often interpreted as evidence for interspecific interactions. However, it is unclear whether theoretical models can predict such patterns and how environmental factors may modify the effects of species interactions on species co-occurrence. Here we extend a spatially explicit neutral model by including competitive effects on birth and death probabilities to assess whether competition alone is able to produce non-random patterns of species co-occurrence. We show that transitive and intransitive competitive hierarchies alone (in the absence of environmental heterogeneity) are indeed able to generate non-random patterns with commonly used metrics and null models. Moreover, even weak levels of intransitive competition can increase local species richness. However, there is no simple rule or consistent directional change towards aggregation or segregation caused by competitive interactions. Instead, the spatial pattern depends on both the type of species interaction and the strength of dispersal. We conclude that co-occurrence analysis alone may not able to identify the underlying processes that generate the patterns
Source
Oikos, vol. 126, num. 1, p. 91 - 100

puce  Accés à la notice sur le site Irstea Publications / Display bibliographic record on Irstea Publications website

  Liste complète des notices de CemOA