University of Tasmania
Bregman_et_al-2015-Ecology.pdf (640 kB)

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

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journal contribution
posted on 2023-05-18, 16:03 authored by Bregman, TP, Lees, AC, Seddon, N, MacGregor, HEA, Darski, B, Aleixo, A, Bonsall, MB, Tobias, JA
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.


Publication title











School of Natural Sciences


Ecological Soc Amer

Place of publication

1707 H St Nw, Ste 400, Washington, USA, Dc, 20006-3915

Rights statement

Copyright? 2015 by the Ecological Society of America

Repository Status

  • Open

Socio-economic Objectives

Terrestrial biodiversity