Data/hora: 01/06/2024 02:13:28

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