Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae)
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, a...
| Autor principal: | Matsuo, Aline Y.O. |
|---|---|
| Outros Autores: | Val, Adalberto Luis |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Brazilian Journal of Medical and Biological Research
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/16416 |
| id |
oai:repositorio:1-16416 |
|---|---|
| recordtype |
dspace |
| spelling |
oai:repositorio:1-16416 Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae) Matsuo, Aline Y.O. Val, Adalberto Luis Calcium Ion Potassium Ion Sodium Ion Animals Experiment Brasil Catfish Concentration (parameters) Controlled Study Exposure Nonhuman Ph Potassium Transport Regulatory Mechanism River Sodium Transport Species Difference Animalsia Callichthyidae Catfish Corydoras Corydoras Schwartzi 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. 2020-06-04T15:17:43Z 2020-06-04T15:17:43Z 2002 Artigo https://repositorio.inpa.gov.br/handle/1/16416 10.1590/S0100-879X2002000300012 en Volume 35, Número 3, Pags. 361-367 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Brazilian Journal of Medical and Biological Research |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Calcium Ion Potassium Ion Sodium Ion Animals Experiment Brasil Catfish Concentration (parameters) Controlled Study Exposure Nonhuman Ph Potassium Transport Regulatory Mechanism River Sodium Transport Species Difference Animalsia Callichthyidae Catfish Corydoras Corydoras Schwartzi |
| spellingShingle |
Calcium Ion Potassium Ion Sodium Ion Animals Experiment Brasil Catfish Concentration (parameters) Controlled Study Exposure Nonhuman Ph Potassium Transport Regulatory Mechanism River Sodium Transport Species Difference Animalsia Callichthyidae Catfish Corydoras Corydoras Schwartzi Matsuo, Aline Y.O. Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae) |
| topic_facet |
Calcium Ion Potassium Ion Sodium Ion Animals Experiment Brasil Catfish Concentration (parameters) Controlled Study Exposure Nonhuman Ph Potassium Transport Regulatory Mechanism River Sodium Transport Species Difference Animalsia Callichthyidae Catfish Corydoras Corydoras Schwartzi |
| description |
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. |
| format |
Artigo |
| author |
Matsuo, Aline Y.O. |
| author2 |
Val, Adalberto Luis |
| author2Str |
Val, Adalberto Luis |
| title |
Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae) |
| title_short |
Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae) |
| title_full |
Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae) |
| title_fullStr |
Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae) |
| title_full_unstemmed |
Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae) |
| title_sort |
low ph and calcium effects on net na+ and k+ fluxes in two catfish species from the amazon river (corydoras: callichthyidae) |
| publisher |
Brazilian Journal of Medical and Biological Research |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/16416 |
| _version_ |
1787145420487524352 |
| score |
11.755432 |