Data/hora: 08/06/2024 16:19:02

Provedor de dados: 	83	
País: 	Brazil	
Título: 	Temporal variability of fish larvae assemblages: influence of natural and anthropogenic disturbances	
Autores: 	Reynalte-Tataje,David A.; Zaniboni-Filho,Evoy; Bialetzki,Andrea; Agostinho,Angelo A.	
Data: 	2012-10-01	
Ano: 	2012	
Palavras-chave: 	Dams; Environmental variables; Ichthyoplankton; Reproduction.	
Resumo: 	Natural and induced disturbances greatly influence the temporal distribution of ichthyoplankton abundance. This study assesses and compares the temporal variability of fish larvae assemblages in controlled and free environments to determine the influence of environment variables on the main taxa in these systems. The study was conducted at the Chapecó (without dam impact) and Ligeiro (with dam impact) river mouths, which are located in the upper Uruguay River. Samples were made between October 2001 and March 2004 during three reproductive periods. The larvae assemblages were composed of small and medium-sized Characiformes and Siluriformes. The variation in the distribution of larvae was mainly temporal (&gt;85%). When the three reproductive periods were compared, it was observed in the second period, characterized by a larger water flow and a lower temperature, that there was a reduction in abundance, a lower number of taxa, an absence of stages in post-flexion and a high dissimilarity in larvae assemblage structure. In general, the environmental variables of water flow and temperature most influenced the distribution of egg and larvae abundance. In the studied area, a smaller temporal variability was observed in the structure of larvae assemblages at the sampling sites in the Chapecó River mouth than in in the Ligeiro River mouth under the influence of dams.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400017	
Editor: 	Sociedade Brasileira de Ictiologia	
Relação: 	10.1590/S1679-62252012000400017	
Formato: 	text/html	
Fonte: 	Neotropical Ichthyology  v.10 n.4 2012	
Fonte: 	info:eu-repo/semantics/openAccess