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By Nicholas Mrosovsky

Mammalian hibernation is usually considered whatever thoroughly phenomenal, a "unique and unorthodox state." the current ebook takes the other view. It argues that the physiological achievements of hibernators don't deEend on detailed mechanisms yet on unique use of standard mechanisms. it really is accurately this that makes the hibernators very important. If the hibernators de­ pend on a few distinct physiological precept their examine is that of a organic curio. but when they're utilizing uncomplicated mammalian structures in a quantitatively severe means, then they seem to be a clearly happening coaching of huge capability. Hibernation consists of each element of the animal's biology from fats metabo­ lism to behaviour, from thermoregulation to dental caries; each approach within the physique is affected in a roundabout way or different via hibernation. A finished account of hibernation will be virtually coextensive with an account of the total of mammalian biology. the current e-book doesn't try to describe every little thing that has been came upon approximately hibernation. first-class insurance for that already exists within the court cases of 3 fresh symposia and within the different significant resource fabrics indexed on web page 233. there's in truth an immense volume of knowledge already on hand. yet there's a distinction among info and knowing. regardless of the expanding quantity of analysis and transforming into curiosity in mammalian hibernation, there's little appreciation of the fundamental features of the phenomena. The items of the puzzle lie scattered.

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Extra info for Hibernation and the Hypothalamus

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Any emphasis on the actual values of increases on a behavioral measure should be suspect in cross-species comparisons where the species differ in characteristics likely to affect the measure, in this case body size, activity levels, and other similar factors (cf. Bitterman, 1960) . Nonetheless, some of the data from hibernators are so striking that, with this caution in mind, the figures will still be given. For example, hedgehogs fed frozen herrings, a food they willingly accept, doubled their body weight from a starting level of 410 to 540 g; other hedgehogs given 50 70 TIME (DAYS) FIGURE 10.

Local heating of the preoptic area of partially anesthetized hamsters, Cricettls cricetus, causes a fall in rectal temperature from base line and a decrease in oxygen consumption when the animals are in a 3° to lOoe environment. There is no evidence that the anterior hypothalamic thermoregulatory regions in hamsters have any special functional characteristics not present in homeotherms (Malan, 1969) . A similar conclusion emerges from experiments by Williams and Heath (1970) on local heating and cooling in ground squirrel brains.

HIBERNATION AND THE HYPOTHALAMUS expect these especially large intakes of the agreeable dextrose mixture in un deprived obese hypothalamics. That these did occur suggests that in the static obese phase, especially, consumption is actually elicited or left unaroused by the stimulus properties of the food, and that not all obesityassociated finickiness is due to motivational states being too weak to drive food intakes over the barriers of disgusting tastes. This is perhaps the most remarkable result in the literature on hyperphagics.

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