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• W2038958105 abstract "Community ecology seeks to unravel the mechanisms that allow species to coexist in space. Some of the contending mechanisms may generate tractable signatures in the amount of trait and phylogenetic dispersion among co-existing species. When a community presents a pattern with reduced trait or phylogenetic dispersion, mechanisms based on ecological filters are brought into consideration. On the other hand, limiting similarity mechanisms such as competitive exclusion are proposed when communities present patterns of trait or phylogenetic even-dispersion. The strength of these mechanisms likely varies with the spatial scale of an observed sample. I surveyed species-rich tropical litter ant communities in a spatially nested design that allowed me to explore the spatial scales, fine (0.25 m 2), intermediate (9 m2), and broad (361 m2) at which these mechanisms act. I then assessed the relationship between observed ant communities and potential species pools ranging in size, from plot, site, and island-wide areas. Patterns of phylogenetic dispersion within ant communities suggested that ant communities were composed of species that were more closely related than expected by a random sampling of phylogenetic pools. The magnitude of phylogenetic ‘clustering’ increased with the size of the species pool but was similar among communities assembled from different spatial scales. Patterns of dispersion of one ecological trait (i.e. body size) within ant communities also showed clustering of body sizes, and most communities were composed of ant species that were smaller than expected by a random sampling of trait pools. Trait clustering increased with the size of the species pool but decreased at broad spatial scales. Together, these results suggest that ecological filters, not interspecific interactions, are structuring tropical ant communities, favoring clades with small worker sizes. The larger dependency on the size of regional pools than on the spatial scale suggests that environmental heterogeneity is greater among than within the study sites. Much of community ecology seeks to unravel the assembly mechanisms allowing species to coexist in space (Hutchinson 1959, Diamond 1975, Hubbell 2001). An increasingly common approach is to infer niche-based assembly mechanisms by the patterns of phylogenetic and trait dispersion among species within communities (Cavender-Bares et al. 2009, Fukami 2010). One set of mechanisms focuses on biotic or abiotic ‘filtering’ processes that generate communities in which the phylogenetic and trait variability among species is reduced. For example, the structure of grassland communities across North America is generally shaped by fire frequency (Collins and Glenn 1990, Cavender-Bares and Reich 2012). Another set focuses on the processes that generate communities where the similarity among coexisting species is limited (e.g. interspecific competition), thus increasing trait and phylogenetic dispersion among species coexisting in communities (Hutchinson 1959). The balance of these processes has been shown to vary among taxocenes and across phylogenetic and spatial scales" @default.
• W2038958105 created "2016-06-24" @default.
• W2038958105 creator A5079979298 @default.
• W2038958105 date "2013-11-01" @default.
• W2038958105 modified "2023-10-13" @default.
• W2038958105 title "Assembly mechanisms shaping tropical litter ant communities" @default.
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• W2038958105 doi "https://doi.org/10.1111/j.1600-0587.2013.00253.x" @default.
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