Animal Life at Low Temperature - download pdf or read online

By John Davenport

ISBN-10: 940105035X

ISBN-13: 9789401050357

ISBN-10: 9401123446

ISBN-13: 9789401123440

To people, chilly has a extraordinarily optimistic caliber. 'Frostbite', 'a nip within the air', 'biting cold', all show the idea that of chilly as an entity which assaults the physique, numbing and destructive it within the strategy. most likely the richness of descriptive English during this zone stems from the early stories of a bunch of basically tropical apes, making their residing on a chilly and windswept island workforce part­ method among the Equator and the Arctic. in the course of a systematic schooling we quickly study that there's no such factor as chilly, simply a scarcity of warmth. chilly doesn't invade us; warmth easily deserts. Later nonetheless we come to understand that temperature is a mirrored image of kinetic strength, and that the volume of kinetic strength in a approach will depend on the rate of molecular flow. regardless of this cognizance, it truly is tricky to desert the practical prejudices of palaeolithic Homo sapiens shivering in his huts and caves. for instance; appreciating polar endure is perhaps as cozy whilst swimming from ice floe to ice floe as we're while swimming in the summertime Mediterranean isn't effortless; knowing the thermal sensa­ tions of a 'cold-blooded' earthworm nearly very unlikely. we should always be cautious of an anthropocentric perspective while contemplating the results of chilly on different species.

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2 PALAEOCLIMATOLOGY Palaeoclimatology relies on a battery of techniques, including traditional geological investigation, measurement of 160 : 18 0 ratios in the shells of fossil foraminiferans, study of palaeomagnetism and fauna/flora analysis. Broadly speaking, information about climate during the Quaternary (roughly the past two million years) is good and rapidly improving, but most data have been obtained for middle latitudes (currently cool temperate in nature). More attention is now being paid to the Tertiary, but inevitably detail is more difficult to obtain the further back in time investigation is pursued.

0 have been recorded in the literature, but thirty years ago Hemmingsen (1960) collected together a most comprehensive array of data for ectotherms 24 Basic concepts and endotherms which indicated a general b value ofO. 75. 8). It can be seen that the line for endotherms, although having a similar b value to ectotherms, has a much higher k (intercept) value, suggesting that endotherms have a standard metabolic rate some 10--15 times as high as ectotherms of similar size. e. 35-40°C) it might be expected from crude QIO estimates that endotherms would only use 2-3 times as much oxygen as ectotherms.

Another piece of evidence in favour of metabolic adaptation at high latitudes is that recent measurements of oxygen uptake and other rate functions of polar marine animals have revealed low QIO values as long as measurements have been made within the narrow limits of temperature which the animals encounter in nature (rather than at the unphysiological and stressful temperature ranges employed in the past). For example: the author (Davenport, 1988) investigated oxygen consumption and ventilatory frequency in the common Antarctic protobranch bivalve mollusc, Yoldia eightsi.

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Animal Life at Low Temperature by John Davenport

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