ISSN:
1430-3418
Keywords:
Ambystoma mexicanum
;
Axolotls
;
Citrate synthase
;
Cytochrome oxidase
;
Lactic dehydrogenase
;
Lipids
;
Metabolic rate
;
Nutrition
;
Thermal acclimation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Juvenile axolotls were acclimated to 15○C or 25○C and either fed or fasted at both temperatures, to study the interaction of thermal acclimation and nutritional state on metabolism. Fasting but not thermal acclimation significantly increased oxygen consumption at 15○C. Fasting also increased the specific activities of two oxidative metabolic enzymes – citrate synthase and cytochrome oxidase – but not that of the glycolytic enzyme lactic dehydrogenase. The specific activity of cytochrome oxidase was further stimulated by cold acclimation. Triglycerides and fatty acids were severely depleted in fasted animals, but thermal acclimation had no significant effect on lipid stores. This study illustrates: (1) the differential nature of various metabolic responses to fasting; and (2) the confounding interaction of the nutritional state on thermal acclimation experiments in an ectotherm.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s00898-998-0001-7
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