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Titolo:
Copper exposure impairs intra- and extracellular acid-base regulation during hypercapnia in the fresh water rainbow trout (Oncorhynchus mykiss)
Autore:
Wang, T; Knudsen, PK; Brauner, CJ; Busk, M; Vijayan, MM; Jensen, FB;
Indirizzi:
Odense Univ, Inst Biol, Ctr Resp Adaptat, DK-5230 Odense M, Denmark OdenseUniv Odense Denmark M Ctr Resp Adaptat, DK-5230 Odense M, Denmark
Titolo Testata:
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTALPHYSIOLOGY
fascicolo: 8, volume: 168, anno: 1998,
pagine: 591 - 599
SICI:
0174-1578(199812)168:8<591:CEIIAE>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
LONG-TERM EXPOSURE; SALMO-GAIRDNERI; IONIC REGULATION; COHO SALMON; BLOOD; PH; ACCUMULATION; ACCLIMATION; HEMOGLOBIN; BALANCE;
Keywords:
hypercapnia; acid-base balance; ion regulation; blood gases; copper;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, T Odenseenmark Inst Biol, Ctr Resp Adaptat, Campusvej 55, DK-5230 Odense M, D Odense Univ Campusvej 55 Odense Denmark M 55, DK-5230 Odense M, D
Citazione:
T. Wang et al., "Copper exposure impairs intra- and extracellular acid-base regulation during hypercapnia in the fresh water rainbow trout (Oncorhynchus mykiss)", J COMP PH B, 168(8), 1998, pp. 591-599

Abstract

In order to evaluate the impact of water-borne copper on acid-base regulation in fresh water rainbow trout, chronically cannulated fish were exposed to copper (0.4 mg l(-1)). hypercapnia (water PCO2 of 6 mmHg) or a combination of copper and hypercapnia, while a fourth untreated group served as the control. Blood samples obtained at 0 h, 4 h and 24 h were analysed for acid-base status, ion concentrations and respiratory parameters. Tissue samplesfrom caudal skeletal muscle, liver and gill filaments were examined for intracellular acid-base status, ion- and water contents, and copper concentration. Exposure to copper alone elicited a small extracellular metabolic alkalosis, no changes in arterial PO2, and a minor decrease in plasma ion concentrations. Hypercapnia alone increased arterial PCO2 from approximately 2 mmHg to 7.2 mmHg, but the extracellular respiratory acidosis present at 4 hwas almost completely compensated at 24 h due to an increase in plasma bicarbonate concentration [HCO3-] from 8.1 mM to 24.4 mM. Combined exposure tohypercapnia and copper resulted in a slightly larger acidosis at 4 h, and the fish failed to restore extracellular pH at 24 h, because plasma [HCO3-]only increased to 16.3 mM. Fish exposed to hypercapnia and copper also showed a delayed recovery of intracellular pH in skeletal muscle, compared to fish exposure to hypercapnia only. Thus, copper exposure impaired both extracellular and intracellular acid-base regulation during hypercapnia. When seen in connection with only minor effects of copper on osmoregulatory and respiratory parameters, the reduced ability to regulate acid-base suggests that acid-base regulation may be one of the most copper-sensitive branchial functions.

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Documento generato il 30/10/20 alle ore 23:32:26