Data/hora: 12/06/2024 15:01:51

Provedor de dados: 	83	
País: 	Brazil	
Título: 	Calcium fluxes in Hoplosternum littorale (tamoatá) exposed to different types of Amazonian waters	
Autores: 	Baldisserotto,Bernardo; Copatti,Carlos Eduardo; Gomes,Levy Carvalho; Chagas,Edsandra Campos; Brinn,Richard Philip; Roubach,Rodrigo.	
Data: 	2009-09-01	
Ano: 	2009	
Palavras-chave: 	Ion flux; Negro River; Amazon River; Acidic water.	
Resumo: 	Fishes that live in the Amazonian environment may be exposed to several kinds of waters: "black waters", containing high dissolved organic carbon and acidic pH, "white waters", with ten fold higher Ca2+ concentrations than black waters and neutral pH, and "clear waters", with two fold higher Ca2+ concentrations than black waters and also neutral pH. Therefore, the aim of the present study was to analyze Ca2+ fluxes in the facultative air-breather Hoplosternum littorale (tamoatá) exposed to different Amazonian waters. Fishes were acclimated in well water (similar to clear water) and later placed in individual chambers for Ca2+ fluxes measurements. After 4 h, water from the chambers was replaced by a different type of water. Transfer of tamoatás to ion-poor black or acidic black water resulted in net Ca2+ loss only in the first 2 h of experiment. However, transfer from black or acidic black water to white water led to only net Ca2+ influxes. The results obtained allowed us to conclude that transfer of tamoatás to ion-poor waters (black and acidic black water) led to transient net Ca2+ loss, while the amount of Ca2+ in the ion-rich white water seems adequate to prevent Ca2+ loss after transfer. Therefore, transfer of tamoatás between these Amazonian waters does not seem to result in serious Ca2+ disturbance.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300014	
Editor: 	Sociedade Brasileira de Ictiologia	
Relação: 	10.1590/S1679-62252009005000002	
Formato: 	text/html	
Fonte: 	Neotropical Ichthyology  v.7 n.3 2009	
Fonte: 	info:eu-repo/semantics/openAccess