Title: Maintenance of Oxygen Consumption in Resting <i>Silurus Glanis</i> at Different Levels of Ambient Oxygenation
Abstract: ABSTRACT The mechanisms of adaptation that allow the teleost Silurus glanis to maintain its resting oxygen consumption constant when the O2 partial pressure in the inspired water varied between 40 and 3 kPa were studied at 13 °C. Steady state values of oxygen consumption, ventilatory and circulatory flow rates, in the inspired and expired water, and O2 concentration in the arterial and venous blood, haematocrit and acid-base status in the arterial blood were determined after 1-day exposures at selected values. Whole-blood O2-binding characteristics were also determined. The key adaptation after 1 day of acclimation was maintenance of oxygen consumption by ventilatory adjustment with no change in blood flow rate or pH (no Bohr effect). At each value (i) the ventilatory adjustment was minimal as the O2 extraction coefficient from water always remained around 80 –90 % and (ii) stayed constant at about 2 kPa. Data are compared with previous results in crayfish and other teleosts. It is concluded that the principle of a constant O2 status in the milieu intérieur - independent of large changes in for a given state of activity - should be valid in many crustaceans and teleosts.
Publication Year: 1989
Publication Date: 1989-05-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 36
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