Artigo

Acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras Paracheirodon axelrodi (Schultz) subjected to extremely low pH

Kinetics of sodium (Na+) and calcium (Ca2+) uptake were studied in cardinal tetras Paracheirodon axelrodi acclimated to humic substances (HS, 35 mg C l-1) and low pH (pH 3.72), parallel to analysis of whole body Na+ and Ca2+ content. This species had a high uptake capacity (Jmax) for both Na+ and Ca...

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Autor principal: Matsuo, Aline Y.O.
Outros Autores: Val, Adalberto Luis
Grau: Artigo
Idioma: English
Publicado em: Journal of Fish Biology 2020
Assuntos:
Paracheirodon Axelrodi
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/18669
id oai:repositorio:1-18669
recordtype dspace
spelling oai:repositorio:1-18669 Acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras Paracheirodon axelrodi (Schultz) subjected to extremely low pH Matsuo, Aline Y.O. Val, Adalberto Luis Paracheirodon Axelrodi Kinetics of sodium (Na+) and calcium (Ca2+) uptake were studied in cardinal tetras Paracheirodon axelrodi acclimated to humic substances (HS, 35 mg C l-1) and low pH (pH 3.72), parallel to analysis of whole body Na+ and Ca2+ content. This species had a high uptake capacity (Jmax) for both Na+ and Ca 2+ in soft, ion-poor water. The affinity constant (Km) did not vary significantly among treatments for either Na+ or Ca 2+. Jmax Na+ increased 30% in fish acclimated to HS for 5 weeks. Acclimation to low pH had no effect on Jmax Na+ but this treatment was associated with a 32% decrease on whole body Na+ content, suggesting that fish were unable to compensate for the increased Na+ loss induced by extreme acidity. Exposure of fish to HS + low pH, the treatment most closely approximating to the conditions experienced by the species in its native environment, resulted in an increase in whole body Na+ by 31% relative to acclimation to low pH alone. Jmax Ca2+ in cardinal tetras was high relative to that documented in other freshwater species acclimated to soft water (Jmax = 30 nmol g-1 h-1). Prolonged exposure of fish to pH 3.72 inhibited Jmax Ca2+ by 53%, although whole body Ca 2+ content remained unchanged relative to control. Acclimation of fish to HS + low pH resulted in an increase of Jmax Ca2+ by 166% relative to low pH alone. Collectively, these results suggest that HS protect cardinal tetras acclimated to soft, acidic waters by preventing excessive Na+ loss (as indicated by whole body Na+ content) and by stimulating Ca2+ uptake (as indicated by increased Jmax Ca2+) to ensure proper homeostasis. © 2007 The Fisheries Society of the British Isles. 2020-06-15T22:02:29Z 2020-06-15T22:02:29Z 2007 Artigo https://repositorio.inpa.gov.br/handle/1/18669 10.1111/j.1095-8649.2007.01358.x en Volume 70, Número 4, Pags. 989-1000 Restrito Journal of Fish Biology
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Paracheirodon Axelrodi
spellingShingle Paracheirodon Axelrodi
Matsuo, Aline Y.O.
Acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras Paracheirodon axelrodi (Schultz) subjected to extremely low pH
topic_facet Paracheirodon Axelrodi
description Kinetics of sodium (Na+) and calcium (Ca2+) uptake were studied in cardinal tetras Paracheirodon axelrodi acclimated to humic substances (HS, 35 mg C l-1) and low pH (pH 3.72), parallel to analysis of whole body Na+ and Ca2+ content. This species had a high uptake capacity (Jmax) for both Na+ and Ca 2+ in soft, ion-poor water. The affinity constant (Km) did not vary significantly among treatments for either Na+ or Ca 2+. Jmax Na+ increased 30% in fish acclimated to HS for 5 weeks. Acclimation to low pH had no effect on Jmax Na+ but this treatment was associated with a 32% decrease on whole body Na+ content, suggesting that fish were unable to compensate for the increased Na+ loss induced by extreme acidity. Exposure of fish to HS + low pH, the treatment most closely approximating to the conditions experienced by the species in its native environment, resulted in an increase in whole body Na+ by 31% relative to acclimation to low pH alone. Jmax Ca2+ in cardinal tetras was high relative to that documented in other freshwater species acclimated to soft water (Jmax = 30 nmol g-1 h-1). Prolonged exposure of fish to pH 3.72 inhibited Jmax Ca2+ by 53%, although whole body Ca 2+ content remained unchanged relative to control. Acclimation of fish to HS + low pH resulted in an increase of Jmax Ca2+ by 166% relative to low pH alone. Collectively, these results suggest that HS protect cardinal tetras acclimated to soft, acidic waters by preventing excessive Na+ loss (as indicated by whole body Na+ content) and by stimulating Ca2+ uptake (as indicated by increased Jmax Ca2+) to ensure proper homeostasis. © 2007 The Fisheries Society of the British Isles.
format Artigo
author Matsuo, Aline Y.O.
author2 Val, Adalberto Luis
author2Str Val, Adalberto Luis
title Acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras Paracheirodon axelrodi (Schultz) subjected to extremely low pH
title_short Acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras Paracheirodon axelrodi (Schultz) subjected to extremely low pH
title_full Acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras Paracheirodon axelrodi (Schultz) subjected to extremely low pH
title_fullStr Acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras Paracheirodon axelrodi (Schultz) subjected to extremely low pH
title_full_unstemmed Acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras Paracheirodon axelrodi (Schultz) subjected to extremely low pH
title_sort acclimation to humic substances prevents whole body sodium loss and stimulates branchial calcium uptake capacity in cardinal tetras paracheirodon axelrodi (schultz) subjected to extremely low ph
publisher Journal of Fish Biology
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/18669
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score 11.755432

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