TEMPERATURE-INDUCED CHANGES IN OXYGEN EQUILIBRIUM CURVE OF BLOOD OF BROWN BULLHEAD ICTALURUS NEBULOSUS

被引:67
作者
GRIGG, GC
机构
[1] Department of Biology, University of Oregon, Eugene, OR
来源
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY | 1969年 / 28卷 / 03期
基金
美国国家科学基金会;
关键词
erythrocyte; haemoglobin; Ictalurus nebulosus; oxygen equilibrium curve; plasma; Temperature; temperature adaptation;
D O I
10.1016/0010-406X(69)90562-3
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
1. 1. The affinity of blood for oxygen is dependent on temperature, which would seem to present a disadvantage to those fishes which encounter large seasonal temperature changes. Considering the well-known acclimatory abilities of many fishes, it would seem reasonable to propose the occurrence of seasonal modification of blood oxygen equilibria to compensate for changes in temperature. 2. 2. In Ictalurus nebulosus, blood from one group of fish acclimated at 24°C showed a consistently higher oxygen affinity compared with a group acclimated at 9°C, when measured at the same temperature. This shift, accompanying thermal metabolic acclimation, minimizes the effect of temperature on oxygen affinity. 3. 3. The shift did not persist when dilute solutions of hemoglobin were studied. 4. 4. No changes with acclimation were seen in the multiple hemoglobin pattern nor in blood pH. 5. 5. The erythrocyte, rather than the plasma, appears to be the site of modification. 6. 6. Some large changes in erythrocyte potassium accompanied thermal acclimation, but the relation of this to the shift in oxygen affinity is unknown. © 1969.
引用
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页码:1203 / &
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