Data/hora: 02/06/2024 05:14:15

Provedor de dados: 	83	
País: 	Brazil	
Título: 	Fish larvae from the upper Paraná River: do abiotic factors affect larval density?	
Autores: 	Baumgartner,Gilmar; Nakatani,Keshiyu; Gomes,Luiz Carlos; Bialetzki,Andréa; Sanches,Paulo Vanderlei; Makrakis,Maristela Cavicchioli.	
Data: 	2008-12-01	
Ano: 	2008	
Palavras-chave: 	Larval ecology; Spatial distribution; Floodplain; Itaipu reservoir; Larval drift.	
Resumo: 	The purpose of this study was to evaluate the role of abiotic factors on fish larvae occurrence. Samplings were carried out monthly at 12 stations (grouped in four areas) in the Amambaí, Ivaí and Paraná rivers and in the Itaipu Reservoir (upper Paraná River basin), from October 1994 to January 1995 (spawning season). Simultaneously, we obtained water temperature, pH, electrical conductivity, dissolved oxygen, water level, water velocity, and rainfall. Principal Component Analyses (PCA) and Detrended Correspondence Analyses (DCA) were applied to summarize abiotic and larvae density data, respectively. Amambaí River differed significantly from the other areas in relation to abiotic factors. Itaipu Reservoir differed significantly from the other areas considering species composition, and the Ivaí River also differed from the Paraná River. The relationship among PCA and DCA axes were significant, indicating that abiotic factors do influence larva. For example: Leporinus elongatus prefered the Amambaí River, Hypophthalmus edentatus, Plagioscion squamosissimus, and Hoplias aff. malabaricus the Itaipu Reservoir, and Pimelodus maculatus, Auchenipterus osteomystax and Iheringichthys labrosus the Ivaí River. We suggest that species selected some abiotic factors characteristic to a given environment as spawning grounds.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400002	
Editor: 	Sociedade Brasileira de Ictiologia	
Relação: 	10.1590/S1679-62252008000400002	
Formato: 	text/html	
Fonte: 	Neotropical Ichthyology  v.6 n.4 2008	
Fonte: 	info:eu-repo/semantics/openAccess