. Advances in the study of mammalian behavior. Mammals. Adapiwencss of JJehaoiur 679 Q UJ I- o LlI Q- 150 X LlI O '00 O UJ a. X Ixl LiJ 0. 50 100 150 200 BASAL RATE OF METABOLISM (% EXPECTED) Fig. 5. Life expectancy, expressed as a percent of the mass-dependent relation of Western (1979), as a function of basal rate of metabolism, expressed as a percent of the rate expected from Kleiber's (1932) relation. Data on life span is from Western (1979) and on basal rates from other sources. ing prey fluctuations, but Mustela and Martes also have high r^ values. At the other end of the spectrum in ene
. Advances in the study of mammalian behavior. Mammals. Adapiwencss of JJehaoiur 679 Q UJ I- o LlI Q- 150 X LlI O '00 O UJ a. X Ixl LiJ 0. 50 100 150 200 BASAL RATE OF METABOLISM (% EXPECTED) Fig. 5. Life expectancy, expressed as a percent of the mass-dependent relation of Western (1979), as a function of basal rate of metabolism, expressed as a percent of the rate expected from Kleiber's (1932) relation. Data on life span is from Western (1979) and on basal rates from other sources. ing prey fluctuations, but Mustela and Martes also have high r^ values. At the other end of the spectrum in energetics, such mam- mals as ant- and termite-eaters and arboreal folivores, would be expected to show relatively constant populations (see Eisenberg, 1975). Unfortunately, there are essentially no data available on the variability of natural populations of these mammals. Third, placentals with high rates of metabolism have shorter life spans than similarly-sized species with low rates of metabolism (Figure 5). This correlation has been used before (Bourliere, 1958) to explain why insectivorous bats have longer life spans than most other mammals of the same size, although Herreid (1964) has argued against this explanation. As a matter of fact. Western (1979) showed that life span in mammals is proportional approximately to body mass raised to the power (m°"). Sacher (1959) described a similar relation. Such a function is similar to one described by McNab (19806), where a time period (in this case the ability to withstand starvation) is given by the ratio of a resource (which is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eisenberg, John Frederick; Kleiman, Devra G; American Society of Mammalogists. [Shippensburg, Pa?] : American Society of Mammalogists
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmammals
