HIBERNATION IS RECORDED IN LOWER INCISORS OF RECENT AND FOSSIL GROUND SQUIRRELS (SPERMOPHILUS)
نویسندگان
چکیده
منابع مشابه
Hibernation effects on memory in European ground squirrels (Spermophilus citellus).
Effects of hibernation on memory were tested in European ground squirrels (Spermophilus citellus). The animals were trained in summer to successfully accomplish two tasks: a spatial memory task in a maze and an operant task on a feeding machine. One group hibernated normally, and the other was prevented from hibernation by maintaining ambient temperature at 22 degrees C. In spring, the same tas...
متن کاملPreference of IRES-mediated initiation of translation during hibernation in golden-mantled ground squirrels, Spermophilus lateralis.
Mammalian hibernation involves virtual cessation of energetically consumptive processes normally vital to homeostasis, including gene transcription and protein synthesis. As animals enter torpor, the bulk of initiation of translation is blocked at a body temperature of 18°C in golden-mantled ground squirrels [Spermophilus (Callospermophilus) lateralis]. Previous data demonstrated regulation of ...
متن کاملAre ground squirrels sleep deprived during hibernation?
Hibernation is an adaptation for energy conservation, which probably evolved as an extension of non-rapid-eye-movement sleep mechanisms. Yet, during periodic arousals from bouts of deep hibernation, ground squirrels (Spermophilus lateralis) spend most of their time asleep. Spectral analysis of the electroencephalogram revealed that cortical slow-wave intensity during sleep is high at the beginn...
متن کاملSciurid phylogeny and the paraphyly of Holarctic ground squirrels (Spermophilus).
The squirrel family, Sciuridae, is one of the largest and most widely dispersed families of mammals. In spite of the wide distribution and conspicuousness of this group, phylogenetic relationships remain poorly understood. We used DNA sequence data from the mitochondrial cytochrome b gene of 114 species in 21 genera to infer phylogenetic relationships among sciurids based on maximum parsimony a...
متن کاملBile constituents in hibernating golden-mantled ground squirrels (Spermophilus lateralis)
BACKGROUND Golden-mantled ground squirrels (S. lateralis) are anorexic during the winter and survive by exploiting hibernation to reduce energetic demands. The liver normally plays a critical role in fueling and regulating metabolism and one might expect significant changes in hepatobiliary function with hibernation. We analyzed bile collected from animals in summer, animals in winter that were...
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ژورنال
عنوان ژورنال: Journal of Mammalogy
سال: 2005
ISSN: 0022-2372,1545-1542
DOI: 10.1644/04-mamm-a-034r.1