Use este identificador para citar ou linkar para este item: http://repositorio.bc.ufg.br/handle/ri/12054
Tipo do documento: Artigo
Título: Contrasting effects of land use intensity and exotic host plants on the specialization of interactions in plant-herbivore networks
Autor: Araújo, Walter Santos
Vieira, Marcos Costa
Lewinsohn, Thomas Michael
Almeida Neto, Mário
Abstract: Human land use tends to decrease the diversity of native plant species and facilitate the invasion and establishment of exotic ones. Such changes in land use and plant community composition usually have negative impacts on the assemblages of native herbivorous insects. Highly specialized herbivores are expected to be especially sensitive to land use intensification and the presence of exotic plant species because they are neither capable of consuming alternative plant species of the native flora nor exotic plant species. Therefore, higher levels of land use intensity might reduce the proportion of highly specialized herbivores, which ultimately would lead to changes in the specialization of interactions in plantherbivore networks. This study investigates the community-wide effects of land use intensity on the degree of specialization of 72 plant-herbivore networks, including effects mediated by the increase in the proportion of exotic plant species. Contrary to our expectation, the net effect of land use intensity on network specialization was positive. However, this positive effect of land use intensity was partially canceled by an opposite effect of the proportion of exotic plant species on network specialization. When we analyzed networks composed exclusively of endophagous herbivores separately from those composed exclusively of exophagous herbivores, we found that only endophages showed a consistent change in network specialization at higher land use levels. Altogether, these results indicate that land use intensity is an important ecological driver of network specialization, by way of reducing the local host range of herbivore guilds with highly specialized feeding habits. However, because the effect of land use intensity is offset by an opposite effect owing to the proportion of exotic host species, the net effect of land use in a given herbivore assemblage will likely depend on the extent of the replacement of native host species with exotic ones.
Palavras-chave: Host plants exotic
Use land
País: Brasil
Instituição: Public Library of Science
Unidade acadêmica: Instituto de Ciências Biológicas - ICB (RG)
Citação: ARAÚJO, Walter Santos de; VIEIRA, Marcos Costa; LEWINSOHN, Thomas M.; ALMEIDA-NETO, Mário. Contrasting effects of land use intensity and exotic host plants on the specialization of interactions in plant-herbivore networks. Plos One, San Francisco, v. 10, n. 1, p. e0115606, Jan. 2015.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1371/journal. pone.0115606
Identificador do documento: 10.1371/journal. pone.0115606
URI: http://repositorio.bc.ufg.br/handle/ri/12054
Data de publicação: Jan-2015
Aparece nas coleções:ICB - Artigos publicados em periódicos

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