| Texto completo | |
| Autor(es): |
Ribeiro Mello, Marco Aurelio
;
Rodrigues, Francisco Aparecido
;
Costa, Luciano da Fontoura
;
Daniel Kissling, W.
;
Sekercioglu, Cagan H.
;
Darcie Marquitti, Flavia Maria
;
Viktoria Kalko, Elisabeth Klara
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | OIKOS; v. 124, n. 8, p. 9-pg., 2015-08-01. |
| Resumo | |
A central issue in ecology is the definition and identification of keystone species, i.e. species that are relatively more important than others for maintaining community structure and ecosystem functioning. Network theory has been pointed out as a robust theoretical framework to enhance the operationality of the keystone species concept. We used the concept of centrality as a proxy for a species 'relative importance for the structure of seed dispersal networks composed of either frugivorous bats or birds and their food-plants. Centrality was expected to be determined mainly by dietary specialization, but also by body mass and geographic range size. Across 15 Neotropical datasets, only specialized frugivore species reached the highest values of centrality. Furthermore, the centrality of specialized frugivores varied widely within and among networks, whereas that of secondary and opportunistic frugivores was consistently low. A mixed-effects model showed that centrality was best explained by dietary specialization, but not by body mass or range size. Furthermore, the relationship between centrality and those three ecological correlates differed between bat-and bird-fruit networks. Our findings suggest that dietary specialization is key to understand what makes a frugivore species a keystone in seed dispersal networks, and that taxonomic identity also plays a significant role. Specialized frugivores may play a central role in network structuring and ecosystem functioning, which has important implications for conservation and restoration. (AU) | |
| Processo FAPESP: | 10/19440-2 - Caracterização, análise, simulação e classificação de redes complexas |
| Beneficiário: | Francisco Aparecido Rodrigues |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 08/10919-3 - Bases biológicas das redes de interação mutualista entre morcegos e plantas |
| Beneficiário: | Flávia Maria Darcie Marquitti |
| Modalidade de apoio: | Bolsas no Brasil - Programa Capacitação - Treinamento Técnico |
| Processo FAPESP: | 06/00265-0 - Frugivoria e dispersão de sementes em morcegos da família Phyllostomidae (Mammalia: Chiroptera) |
| Beneficiário: | Marco Aurelio Ribeiro de Mello |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 11/11346-0 - Parasitas de interações e a coevolução de mutualismos |
| Beneficiário: | Flávia Maria Darcie Marquitti |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 07/50633-9 - Redes complexas: uma abordagem por mineracao de dados. |
| Beneficiário: | Francisco Aparecido Rodrigues |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 05/00587-5 - Modelagem por redes (grafos) e técnicas de reconhecimento de padrões: estrutura, dinâmica e aplicações |
| Beneficiário: | Roberto Marcondes Cesar Junior |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |