Fear mediates trophic cascades : nonconsumptive effects of predators drive aquatic ecosystem function

Autor: Breviglieri, Crasso Paulo Bosco, 1980, Oliveira, Paulo Sergio Moreira Carvalho de, 1957, Romero, Gustavo Quevedo, 1974
Přispěvatelé: UNIVERSIDADE ESTADUAL DE CAMPINAS
Rok vydání: 2017
Předmět:
Zdroj: Repositório da Produção Científica e Intelectual da Unicamp
Universidade Estadual de Campinas (UNICAMP)
instacron:UNICAMP
Popis: Agradecimentos: We thank the Graduate Ecology Program of the University of Campinas (UNICAMP). C.P.B.B. received a postdoctorate scholarship from the National Postdoctoral Program/Brazilian Federal Agency for the Support and Evaluation of Graduate Education (Coordination for the Improvement of Higher Education Personnel [PNPD/CAPES]). P.S.O. was supported by research grants from the Brazilian National Council for Scientific and Technological Development (CNPq; grant 306115/2013-1) and the São Paulo Research Foundation (FAPESP; grant 2014/23141-1). G.Q.R. received research grants from CNPq and FAPESP. We thank B. M. Bolker, J. L. Bronstein, M. Leibold, and two anonymous reviewers for their valuable comments on the manuscript Abstract: Predators control prey populations and influence communities and the functioning of ecosystems through a combination of consumptive and nonconsumptive effects. These effects can be locally confined to one ecosystem but can also be extended to neighboring ecosystems. In this study, we investigated the nonconsumptive effects of terrestrial avian predators on the communities of aquatic invertebrates inhabiting bromeliads and on the functioning of these natural ecosystems. Bromeliads with stuffed birds placed nearby showed a decrease in aquatic damselfly larvae abundance and biomass, and we can infer that these changes were caused by antipredator responses. These larvae, which are top predators in bromeliad ecosystems, changed the composition of the entire aquatic invertebrate community. While total species richness, mesopredator richness, and shredder abundance increased in the presence of birds, scraper biomass decreased, possibly as a consequence of the increase in mesopredator richness. High scraper biomass in the absence of birds may have accelerated detrital decomposition, making more nutrients available for bromeliads, which grew more. These results show that nonconsumptive effects triggered by terrestrial predators can cascade down to lower trophic levels and dramatically affect the functioning of aquatic ecosystems, which can in turn alter nutrient provision to terrestrial ecosystems COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP Aberto
Databáze: OpenAIRE
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