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Loss of Generalist Plant Species and Functional Diversity Decreases the Robustness of a Seed Dispersal Network

Published online by Cambridge University Press:  09 November 2018

Vinicius AG Bastazini Open the ORCID record for Vinicius AG Bastazini [Opens in a new window] ,
Vanderlei J Debastiani ,
Bethânia O Azambuja ,
Paulo R Guimarães Jr  and
Valério D Pillar
Vinicius AG Bastazini*
Affiliation:
Theoretical and Experimental Ecology Station, National Center for Scientific Research – Paul Sabatier University, 2 route du CNRS, 09200, Moulis, France Graduate Program in Ecology, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91501-970, Brazil
Vanderlei J Debastiani
Affiliation:
Graduate Program in Ecology, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91501-970, Brazil
Bethânia O Azambuja
Affiliation:
Graduate Program in Ecology, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91501-970, Brazil
Paulo R Guimarães Jr
Affiliation:
Departmento de Ecologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, Travessa 14, no. 321, 05508-900, São Paulo, SP, Brazil
Valério D Pillar
Affiliation:
Department of Ecology, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91501-970, Brazil
*
Author for correspondence: Dr Vinicius AG Bastazini, Email: [email protected]
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Summary

Understanding cascading effects of species loss is a major challenge for ecologists. Traditionally, the robustness of ecological networks has been evaluated based on simulation studies where primary extinctions occur at random or as a function of species specialization, ignoring other important biological factors. Here, we estimate the robustness of a seed dispersal network from a grassland–forest mosaic in southern Brazil, simulating distinct scenarios of woody plant species extinction, including scenarios where species are eliminated based on their evolutionary and functional distinctiveness. Our results suggest that the network is more robust when species are eliminated based on their evolutionary uniqueness, followed by random extinctions, the extinction of the most specialist species, functional distinctiveness and, at last, when the most generalist species are sequentially eliminated. Our results provide important information for grassland–forest mosaic management, as they indicate that loss of generalist species and functional diversity makes the system more likely to collapse.

Keywords

coextinctionsecophylogeneticsmutualistic interactionsnetwork disassemblyspecies traits
Type
Non-Thematic Papers
Information
Environmental Conservation , Volume 46 , Special Issue 1: Thematic Section: Forests in Flux , March 2019 , pp. 52 - 58
Copyright
© Foundation for Environmental Conservation 2018 

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