Kurzfassung
Beim Aal weisen der Grundstoffwechsel, gemessen am Sauerstoffverbrauch des Ganztieres, und die Atmung des Muskelgewebes in vitro eine partielle Kompensation auf. Die Höhe des Standardsauerstoffverbrauchs ist aber unabhängig von der Stoffwechselaktivität eines größeren Teiles der Skelettmuskulatur. Es wird über Messungen des Sauerstoffpartialdrucks in der Muskulatur und im venösen Blut unterschiedlich adaptierter Aale berichtet. Die niedrige Sauerstoffspannung im Gewebe und die starke Abhängigkeit des Sauerstoffpartialdrucks im venösen Blut von der Atmungsintensität sprechen dafür, daß ein Mechanismus, der den Standardsauerstoffverbrauch des adaptierenden Ganztieres steuert, in einer Regulation des Kreislaufs und der Atmung zu sehen ist.
Summary
1. The present paper reviews some investigations on the problem of temperature adaptation of the eel. The experiments were made in order to find out why the metabolic rate of muscle in vitro does not reflect the capacity adaptation of the intact eel.
2. Oxygen tension in the muscle tissue and in the venous blood has been measured by inserting micro oxygen electrodes. Oxygen tension in the muscle of the tail is very low; tension in the large caudal vein is more than ten times higher.
3. Oxygen tension in the muscle is not altered by changing the adaptation temperature. The cold-acclimated eel shows a lower oxygen tension in the venous blood than the warm-adapted fish.
4. Oxygen tension in the caudal vein depends largely on the breathing rate; this can be seen when the experimental temperature is changed and differently adapted individuals are tested. Therefore we suggest that the metabolic rate is certainly influenced by adaptive changes in the nervous system.
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Literature cited
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Jankowsky, HD. The effect of adaptation temperature on the metabolic level of the eelAnguilla vulgaris L.. Helgolander Wiss. Meeresunters 13, 402–407 (1966). https://doi.org/10.1007/BF01611957
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DOI: https://doi.org/10.1007/BF01611957