Carina Siutz, Matthias Nemeth, Ruth Quint, Karl-Heinz Wagner, Eva Millesi
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引用次数: 0
Abstract
AbstractHibernators save energy during winter by expressing torpor bouts characterized by strongly reduced body temperature and metabolic rate. Polyunsaturated fatty acids (PUFAs), specifically n-6 PUFAs, are known to positively affect hibernation performance and thereby energy savings predominantly in fat-storing hibernators. Accordingly, hibernators usually retain PUFAs and mobilize monounsaturated fatty acids (MUFAs) or saturated fatty acids (SFAs) during hibernation. In food-storing common hamsters (Cricetus cricetus), however, we previously found that PUFA proportions in white adipose tissue (WAT) decreased during winter, indicating that individuals did mobilize PUFAs. To further investigate these patterns, we analyzed PUFA changes in WAT during hibernation as well as hibernation performance in free-ranging and captive common hamsters with lower prehibernation PUFA proportions compared to those in the previous study. Under controlled conditions, total PUFAs, n-6 PUFAs, and SFAs increased while n-3 PUFAs and MUFAs decreased during hibernation. Higher prehibernation n-6 PUFA proportions resulted in fewer torpor bouts and less time spent in torpor. In free-ranging hamsters, n-6 PUFAs increased while n-3 PUFAs and SFAs decreased during winter. Prehibernation n-6 PUFA proportions, however, did not affect hibernation performance. In summary, these results indicate that the mobilization or retention of n-6 PUFAs during hibernation could depend on their availability in WAT or in the diet before the onset of the hibernation period.
期刊介绍:
Physiological and Biochemical Zoology: Ecological and Evolutionary Approaches primarily publishes original research in animal physiology and biochemistry as considered from behavioral, ecological, and/or evolutionary perspectives. Studies at all levels of biological organization from the molecular to the whole organism are welcome, and work that integrates across levels of organization is particularly encouraged. Studies that focus on behavior or morphology are welcome, so long as they include ties to physiology or biochemistry, in addition to having an ecological or evolutionary context.
Subdisciplines of interest include nutrition and digestion, salt and water balance, epithelial and membrane transport, gas exchange and transport, acid-base balance, temperature adaptation, energetics, structure and function of macromolecules, chemical coordination and signal transduction, nitrogen metabolism and excretion, locomotion and muscle function, biomechanics, circulation, behavioral, comparative and mechanistic endocrinology, sensory physiology, neural coordination, and ecotoxicology ecoimmunology.