Null model analyses of small mammal community structure in tropical islands

Peer-reviewed papers on the community structure of small mammals (Rodentia and Soricomorpha) from the tropical islands across the world were reviewed. In order to detect non-random patterns in the various assemblages under study, the original datasets were re-analyzed using null models (two independent randomization algorithms for niche overlap) and Monte Carlo simulations. Non-random habitat niche partitioning was rarely observed in rodents, whereas it was the rule in soricomorphs. Aggregated use of habitat resources was occasionally detected in rodents. Thus, in agreement with expectations, our review revealed clear evidence for interspecific competition along the habitat niche axis in tropical island soricomorphs but not in rodents.