Florian Hofhansl

Tropical Ecosystem Research

Beta diversity and oligarchic dominance in the tropical forests of Southern Costa Rica

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Our article entitled “Beta diversity and oligarchic dominance in the tropical forests of Southern Costa Rica” was recently published in the journal Biotropica doi.org/10.1111/btp.12638.

Forest community assembly is shaped by environmental factors and stochastic processes, but so far the contribution of oligarchic species to the variation of community composition (i.e., beta diversity) remains poorly known. We established 1‐ha permanent inventory plots in humid lowland tropical forests of southwestern Costa Rica to identify oligarch species characterizing changes in community composition among forest types. Based on this network of forest plots we investigate how community composition responds to differences in topography, successional stage, and distance among plots for different groups of species (all, oligarch, common and rare/very rare species). From a total of 485 species of trees, lianas and palms recorded in this study only 27 species (i.e., 6%) were nominated as oligarch species. Oligarch species accounted for 37% of all recorded individuals and were present in at least half of the plots. Plant community composition significantly differed among forest types, thus contributing to beta diversity at the landscape scale. Oligarch species was the component best explained by geographical and topographic variables, allowing a confident characterization of the beta diversity among tropical lowland forest stands.

Please see this link to the online version of the article.

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