Patterns of Nestedness in Remote Polynesian Ant Faunas (Hymenoptera: Formicidae).

Date
2008-01
Authors
Morrison, Lloyd W.
Journal Title
Journal ISSN
Volume Title
Publisher
Honolulu, University of Hawaii Press
Abstract
The entire ant faunas of remote Polynesian islands consist of introduced species. An important question concerning the assembly of Pacific island ant faunas is whether these species are a random assortment of the available species pool, or whether they exhibit highly ordered occurrence patterns (i.e., nested subsets of species). I evaluated nestedness for the ant faunas of two island groups in remote Polynesia: (1) the Hawaiian Islands, and (2) French Polynesia and the Cook Islands. Wilcoxon two-sample tests were used to analyze nestedness patterns for individual species and islands; the degree of nestedness for species assemblages and archipelagos was determined by combining tail probabilities of individual species and islands. Both island groups revealed highly significant nestedness at the level of the assemblage (a per-species approach) as well as the archipelago (a per-island approach). Considered individually, most species (73–95%) and most islands (89–100%) demonstrated significant nestedness. Instances of nonsignificant nestedness were frequently associated with low statistical power. These results reveal a strong deterministic element in the assemblage of remote Polynesian ant faunas. Dispersal opportunities along with presence of appropriate habitat type are likely the most important mechanisms underlying the observed patterns.
Description
v. ill. 23 cm.
Quarterly
Keywords
Citation
Morrison LW. Patterns of Nestedness in Remote Polynesian Ant Faunas (Hymenoptera: Formicidae). Pac Sci 62(1): 117-128.
Rights
Access Rights
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.