Data/hora: 14/06/2024 15:18:54

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 18/11/1997
Data da última atualização: | 05/04/2017
Autoria: | STRANGE, E. M.; MOYLE, P. B.; FOIN, T. C.
Título: | Interactions between stochastic and deterministic processes in stream fish community assembly.
Ano de publicação: | 1992
Fonte/Imprenta: | Environmental Biology of Fishes, v.36, p.1-15, 1992.
Idioma: | Inglês
Conteúdo: | Numerous studies have attempted to determine whether stream fish communities are structured primarily by deterministic or stochastic processes. Previous work has assumed that stream communities will show either persistence about an equilibrium because of strong density-dependent processes or random variation in structure as a result of environmental stochasticity. In a 10-year studi of a California stream, fish community structure changed under the influence of storm-induced high events that impacted recruitment. Species' relative abundances were altered as pre-recruitment stream discharges differentially influenced year-class strength among species with contrasting life histories. Simulation of stream fish community assembly under flow-driven recruitment variation indicates that community structure will vary depending on how particular high-flow events affect species' relative abundances and ongoing density-dependent processes, including competition and predation. Results suggest that stream fish communities are likely to show alternate states rather than a single persistent equilibrium. However, community assembly will not be random but will depended on situation-specific interactions between density-independent and density-dependent process.
Palavras-Chave: | Comunidade; Desenvolvimento; Environmental stochasticity; Fluxo; Natural variation; Stream fish; Variacao natural.
Thesagro: | Peixe.
Thesaurus Nal: | community development.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (35131-1) - ADC - SP - PP - SP15454 -  - 15454 - DIS