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Campo DC | Valor | Idioma |
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dc.contributor.author | Matsuo, Aline Y.O. | - |
dc.contributor.author | Val, Adalberto Luis | - |
dc.date.accessioned | 2020-06-04T15:17:43Z | - |
dc.date.available | 2020-06-04T15:17:43Z | - |
dc.date.issued | 2002 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/16416 | - |
dc.description.abstract | The present study analyzes Na+ and K+ disturbances caused by low pH in two catfish species from the Amazon River. Corydoras adolfoi inhabits ion-poor, black-stained, low pH (3.5-4.0) waters, while C. schwartzi is native to ion-rich waters at circumneutral pH. Fish were exposed to pH 3.5 Ca2+-free, and Ca2+-enriched (∼500 μmol/l) water to determine the protective effects of calcium. Net Na+ and K+ fluxes were measured in the water collected from the fish experimental chambers. C. adolfoi was unable to control the Na+ efflux at low pH. exhibiting Na+ loss up to -594 ± 84 nmol g-1 h-1 during the first hour. After 3 and 6 h, net Na+ flux increased by 7- and 23-fold, respectively. In C. schwartzi, at pH 3.5, the initial high Na+ loss (-1,063 ± 73 nmol g-1 h-1) was gradually attenuated. A K+ loss occurred in both species, but remained relatively constant throughout exposure. High [Ca2+] affected ion losses in both species. C. adolfoi had 70% loss attenuation, indicating incapacity to control Na+ efflux. In C. schwartzi, elevated [Ca2+] completely prevented the Na+ losses caused by exposure to low pH. Rather different patterns were seen for K+ fluxes, with C. adolfoi showing no K+ disruption when exposed to low pH/high [Ca2+]. Thus, C. adolfoi loses Na+ during acid exposure, but has the ability to control K+ loss, while C. schwartzi controls diffusive Na+ loss but exhibits a slightly higher K+ loss. Ion balance was influenced by [Ca2+] at low pH in C. schwartzi but not in C. adolfoi. | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 35, Número 3, Pags. 361-367 | pt_BR |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Brazil | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/br/ | * |
dc.subject | Calcium Ion | en |
dc.subject | Potassium Ion | en |
dc.subject | Sodium Ion | en |
dc.subject | Animals Experiment | en |
dc.subject | Catfish | en |
dc.subject | Concentration (parameters) | en |
dc.subject | Controlled Study | en |
dc.subject | Exposure | en |
dc.subject | Nonhuman | en |
dc.subject | Ph | en |
dc.subject | Potassium Transport | en |
dc.subject | Regulatory Mechanism | en |
dc.subject | River | en |
dc.subject | Sodium Transport | en |
dc.subject | Species Difference | en |
dc.subject | Animalsia | en |
dc.subject | Callichthyidae | en |
dc.subject | Catfish | en |
dc.subject | Corydoras | en |
dc.subject | Corydoras Schwartzi | en |
dc.title | Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae) | en |
dc.type | Artigo | pt_BR |
dc.identifier.doi | 10.1590/S0100-879X2002000300012 | - |
dc.publisher.journal | Brazilian Journal of Medical and Biological Research | pt_BR |
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