Kinetics of the acclimational responses of tench to combined hypoxia and hypercapnia |
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Authors: | Jensen Frank B Weber Roy E |
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Institution: | (1) Institute of Biology, Odense University, DK-5230 Odense M, Denmark |
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Abstract: | Summary Exposing tench to environmental hypoxia-hypercapnia reduces routine O2 consumption, sharply decreases arterial O2 tension and the
difference between the water and the blood, and results in marked swelling of the erythrocytes. These changes are rapidly reversed upon return to normoxia.Hypoxic-hypercapnic conditions lower the blood NTP/Hb ratio to a new steady state level within 24 h, by reducing GTP/Hb but not ATP/Hb. A similar selective reduction of eryhtrocytic GTP content forms the initial response of blood incubated in vitro to anoxic conditions.The swelling as well as the reduced GTP/Hb ratio in the erythrocytes appear to improve O2 loading in the gills during environmental hypoxia-hypercapnia.Symbols and abbreviations
a
arterial
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GTP
guanosine triphosphate
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Hct
hematocrit
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I
inspired
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NTP
nucleoside triphosphate
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w
water |
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Keywords: | |
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