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Titolo:
Effect of air breathing on acid-base and ion regulation after exhaustive exercise and during low pH exposure in the bowfin, Amia calva
Autore:
Gonzalez, RJ; Milligan, L; Pagnotta, A; McDonald, DG;
Indirizzi:
Univ San Diego, Dept Biol, San Diego, CA 92110 USA Univ San Diego San Diego CA USA 92110 Dept Biol, San Diego, CA 92110 USA Univ Western Ontario, Dept Zool, London, ON N6A 5B6, Canada Univ Western Ontario London ON Canada N6A 5B6 London, ON N6A 5B6, Canada McMaster Univ, Dept Biol, Hamilton, ON L8S 4K1, Canada McMaster Univ Hamilton ON Canada L8S 4K1 ol, Hamilton, ON L8S 4K1, Canada
Titolo Testata:
PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY
fascicolo: 4, volume: 74, anno: 2001,
pagine: 502 - 509
SICI:
1522-2152(200107/08)74:4<502:EOABOA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT SALMO-GAIRDNERI; RAINBOW-TROUT; CATECHOLAMINE RELEASE; FISH; VENTILATION; RESPIRATION; MORPHOLOGY; PLASMA; GILLS; CELLS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Gonzalez, RJ Univ San Diego, Dept Biol, 5998 Alcala Pk, San Diego, CA 92110 USA Univ San Diego 5998 Alcala Pk San Diego CA USA 92110 2110 USA
Citazione:
R.J. Gonzalez et al., "Effect of air breathing on acid-base and ion regulation after exhaustive exercise and during low pH exposure in the bowfin, Amia calva", PHYSIOL B Z, 74(4), 2001, pp. 502-509

Abstract

To explore a potential conflict between air breathing and acid-base regulation in the bowfin (Amia calva), we examined how individuals with access toair differed from fish without air access in their response to acidosis. After exhaustive exercise, bowfin with access to air recovered significantlymore slowly from the acidosis than fish without air access. While arterialblood pH (pH(a)) of fish without air access recovered to resting levels by8 h, pH(a) was still significantly depressed in fish having access to air. In addition, Pco(2) was slightly more elevated in fish having air access than those without it. Fish with access to air still had a significant metabolic acid load after 8-h recovery, while those without air access completely cleared the load within 4 h. These results suggest that bowfin with access to air were breathing air and, consequently, were less able to excrete CO2 and H+ and experienced a delayed recovery. In contrast, during exposure to low pH(a) air breathing seemed to have a protective effect on acid-base status in bowfin. During exposure to low pH water, bowfin with access to airdeveloped a much milder acidosis than bowfin without air access. The more severe acidosis in fish without air access was caused by an increased rate of lactic acid production. It appears that enhanced O-2 delivery allowed air-breathing bowfin to avoid acidosis-induced anaerobic metabolism and lactic acid production. In addition, during low pH exposure, plasma Na+ and Cl- concentrations of fish without air access fell slightly more rapidly than those in fish with air access, indicating that the branchial ventilatory changes associated with air breathing limited, to some degree, ion losses associated with low pH exposure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 10:21:55