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

Morera-Beita A, Sánchez D, Wanek W, Hofhansl F ORCID: https://orcid.org/0000-0003-0073-0946, Werner H, Chacón-Madrigal E, Montero-Muñoz JL, & Silla F (2019). Beta diversity and oligarchic dominance in the tropical forests of Southern Costa Rica. Biotropica 51 (2): 117-128. DOI:10.1111/btp.12638.

[img] Text
ATT00001.htm - Accepted Version
Restricted to Repository staff only until 2 March 2020.
Available under License Creative Commons Attribution Non-commercial.

Download (14kB)

Abstract

Recent studies have reported a consistent pattern of strong dominance of a small subset of tree species in neotropical forests. These species have been called “hyperdominant” at large geographical scales and “oligarchs” at regional‐landscape scales when being abundant and frequent. 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. To that end, we established 20.1‐ha plots, that is, five sites with four forest types (ridge, slope and ravine primary forest, and secondary forest) per site, in humid lowland tropical forests of southwestern Costa Rica to (a) 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) and (b) identify oligarch species characterizing changes in community composition among forest types. 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.

Item Type: Article
Research Programs: Ecosystems Services and Management (ESM)
Depositing User: Luke Kirwan
Date Deposited: 04 Mar 2019 12:29
Last Modified: 18 Mar 2019 08:28
URI: http://pure.iiasa.ac.at/15777

Actions (login required)

View Item View Item

International Institute for Applied Systems Analysis (IIASA)
Schlossplatz 1, A-2361 Laxenburg, Austria
Phone: (+43 2236) 807 0 Fax:(+43 2236) 71 313