By Nicholas Mrosovsky

Mammalian hibernation is often regarded as anything thoroughly extra special, a "unique and unorthodox state." the current e-book takes the other view. It argues that the physiological achievements of hibernators don't deEend on designated mechanisms yet on detailed use of normal mechanisms. it's accurately this that makes the hibernators vital. If the hibernators de­ pend on a few particular physiological precept their research is that of a organic curio. but when they're utilizing uncomplicated mammalian structures in a quantitatively severe manner, then they're a evidently taking place instruction of huge capability. Hibernation comprises each point of the animal's biology from fats metabo­ lism to behaviour, from thermoregulation to dental caries; each method within the physique is affected not directly or different by means of hibernation. A finished account of hibernation will be nearly coextensive with an account of the complete of mammalian biology. the current publication doesn't try and describe every little thing that has been found approximately hibernation. very good insurance for that already exists within the complaints of 3 contemporary symposia and within the different significant resource fabrics indexed on web page 233. there's actually a big quantity of knowledge already on hand. yet there's a distinction among details and realizing. regardless of the expanding quantity of analysis and becoming 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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These are extreme instances of weight gain in hedgehogs; less marked changes are shown in Figure 29. California ground squirrels of about 600 g can put on 15 g per day (Tomich, 1962). Edible dormice, Glis glis, starting from levels of near 150 g may suddenly gain 4 g per day and sustain this rate for over two weeks (Mrosovsky, 1966a). The hazel dormouse, Muscardintts avellanaritts, is also capable of rapid fattening: Rabus' (1882) records show an individual increasing from 24 to 37 g in 27 days, a rate of about Y2 g per day (Fig.

Compo physiol. , 64: 12-13. Copyright 1967 by the American Psychological Association, and reproduced by permission. 4 Here again there are parallels between hibernation and migration. Fontaine (1954) states that there are no fundamental differences in structure or functioning between closely related species some of which migrate while others are sedentary. " ... esity: A Theory Based on Behavioral Tests The phenomenon of autumnal obesity In the late summer and autumn many hibernating species become fat, sometimes grossly so (Plate 5); common experience, field studies, and measurements in the laboratory all agree on this.

On the first day of the test, however, the normal rats only 8 One g quinine sulphate per 100 g of liquid diet. The Medial HypothalamllS and Prehibernation Obesity 4I drank about one half as 'much as usual. The figures given by Fuller and Jacoby (1955) are also interesting. They show that for the first day an adulterated diet is offered, obese and normal animals differed only slightly in their intakes of nutritive matter. The differences appeared only as the tests progressed; the normal animals then increased their intakes more than did the obese.

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