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Species interactions regulate the collapse of biodiversity and ecosystem function in tropical forest fragments


Bregman, TP and Lees, AC and Seddon, N and MacGregor, HEA and Darski, B and Aleixo, A and Bonsall, MB and Tobias, JA, Species interactions regulate the collapse of biodiversity and ecosystem function in tropical forest fragments, Ecology, 96, (10) pp. 2692-2704. ISSN 0012-9658 (2015) [Refereed Article]


Copyright Statement

Copyright 2015 by the Ecological Society of America

DOI: doi:10.1890/14-1731.1


Competitive interactions among species with similar ecological niches are known to regulate the assembly of biological communities. However, it is not clear whether such forms of competition can predict the collapse of communities and associated shifts in ecosystem function in the face of environmental change. Here, we use phylogenetic and functional trait data to test whether communities of two ecologically important guilds of tropical birds (frugivores and insectivores) are structured by species interactions in a fragmented Amazonian forest landscape. In both guilds, we found that forest patch size, quality, and degree of isolation influence the phylogenetic and functional trait structure of communities, with small, degraded, or isolated forest patches having an increased signature of competition (i.e., phylogenetic and functional trait overdispersion in relation to null models). These results suggest that local extinctions in the context of fragmentation are nonrandom, with a consistent bias toward more densely occupied regions of niche space. We conclude that the loss of biodiversity in fragmented landscapes is mediated by niche-based competitive interactions among species, with potentially far-reaching implications for key ecosystem processes, including seed dispersal and plant damage by phytophagous insects.

Item Details

Item Type:Refereed Article
Keywords:avian communities, biodiversity conservation, community disassembly, diet and morphology, ecosystem services, fragmentation, functional traits, habitat filtering, interspecific competition, limiting similarity, Mato Grosso, Brazil
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Terrestrial ecology
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial biodiversity
UTAS Author:MacGregor, HEA (Ms Hannah MacGregor)
ID Code:105901
Year Published:2015
Web of Science® Times Cited:44
Deposited By:Zoology
Deposited On:2016-01-20
Last Modified:2016-05-30
Downloads:228 View Download Statistics

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