Data/hora: 04/06/2024 02:04:51

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	31/07/1996	
Data da última atualização: 	04/04/2017	
Autoria: 	ROSS, S. T.; MATTHEWS, W. J.; ECHELLE, A. A.	
Título: 	Persistence of stream fish assemblages: effects of environmental change.	
Ano de publicação: 	1985	
Fonte/Imprenta: 	American Naturalist, v.126, n.1, p.24-40, 1985.	
Idioma: 	Inglês	
Conteúdo: 	Knowledge of temporal stability and persistence of ecological communities is critical to an understanding of the importance of biotic interactions in the maintenance of community structure. Herein we have considered temporal stability and persistence of two fish assemblages, one in Brier Creek, a harsh prairie stream in southern Oklahoma and the other in Piney Creek, a more benign stream in the Arkansas Ozarks. Persistence, as indicated by presence data, was high for both stream assemblages over approximately one decade. Assemblage stability, as determined from measures of abundance, indicated greather change in the overall fish fauna of Brier Creek than that of Piney Creek. Southeastern Oklahoma had a severe summer drought in 1980 resulting in heat death of fishes in Brier Creek. Although some species were transiently affected, the harsh summer did not have a lasting effect on the Bier Creek fish assemblage overall. Upstream stations subjected to regular summer drying, however, showed greater variability in numerical species ranks within a characteristic suite of upstream species, compared with downstream stations. Station-level changes in both Piney and Brier creeks were significant in several cases, even thought the overall fauna of the former did not change significantly in species-abundance ranks. Thus, geographic scale may have had a maior effect on the assessment of assemblage stability and persistence. We suggest that, in the absence of detailed knowledge of home ranges of component species, an assessment of assemblage stability should be based on a least several localities within a watershed.	
Palavras-Chave: 	Assemblage; Comunidade; Environmental changes; Estabilidade; Persistence; Pertubacao alimentar; Stability.	
Thesagro: 	Peixe.	
Thesaurus Nal: 	fish.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (32824-1) - ADD - SP - PP - SP14910 -  - 14910 - DIS