Oxygen consumption and body temperature in yellow-bellied marmot populations from montane-mesic and lowland-xeric environments

Armitage, Kenneth B.; Melcher, Jaye C.; Ward, John M.

doi:10.1007/bf00258976

Cited by 29 publications

(16 citation statements)

References 36 publications

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“…The species hibernates from September or October to April or May, during which time individuals lose approximately 40% of their body mass 25 . The need to mobilize energy for reproduction and then prepare for hibernation in a short time period accounts for the energy conservative physiology of this species 32,33 . The critical factor determining winter survival and subsequent reproductive success is the amount of fat accumulated prior to hibernation 34,35 .…”

Section: Methodsmentioning

confidence: 99%

Coupled dynamics of body mass and population growth in response to environmental change

Özgül

Childs

Oli

et al. 2010

Nature

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554

607

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Environmental change has altered the phenology, morphological traits and population dynamics of many species1,2. However, the links underlying these joint responses remain largely unknown due to a paucity of long-term data and the lack of an appropriate analytical framework3. Here, we investigate the link between phenotypic and demographic responses to environmental change using a novel methodology and an exceptional long-term (1976–2008) dataset from a hibernating mammal (the yellow-bellied marmot) inhabiting a dynamic subalpine habitat. We demonstrate how earlier emergence from hibernation and earlier weaning of young has led to a longer growing season and larger body masses prior to hibernation. The resulting shift in both the phenotype and the relationship between phenotype and fitness components led to a decline in adult mortality, which in turn triggered an abrupt increase in population size in recent years. Direct and trait-mediated effects of environmental change had comparable contributions to the observed dramatic increase in population growth. Our results help explain how a shift in phenology can cause simultaneous phenotypic and demographic changes, and highlight the need for a theory integrating ecological and evolutionary dynamics in stochastic environments4,5.

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Section: Methodsmentioning

confidence: 99%

Coupled dynamics of body mass and population growth in response to environmental change

Özgül

Childs

Oli

et al. 2010

Nature

Self Cite

554

607

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show abstract

“…17). Calculations done in collaboration with Dr Jaye Melcher are compared against empirical data by (Armitage et al 1990). …”

Section: Model Testsmentioning

confidence: 99%

Endotherm Energetics - From a Scalable Individual-Based Model to Ecological Applications

Porter¹,

Munger²,

Stewart³

et al. 1994

Aust. J. Zool.

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We outline a computer model of heat and mass transfer through flesh, fat and porous fur for endotherms of any dimensions. We then validate it with a series of laboratory studies. Finally, we explore applications of the model to Bergmann's rule, predicting the mouse-to-elephant curve, climatedisease-toxicant interactions, animal 'design' via genetic engineering and energetic constraints on community structure.As a first test of the model we present calculations and metabolic chamber measurements for mammals ranging in size from mice to Holstein calves. We then compare simultaneous measurements on deer mice, Peromyscus maniculatus, of oxygen consumption, doubly labelled water turnover and food consumption with calculations of metabolic rate using body temperature radio-telemetry as input to the endotherm model. The endotherm model derived in the Appendix requires data on allometry (body dimensions, surface area), fur properties, core temperature, air and radiant temperatures and wind speed. The model is useful for calculating energetic expenditure in different microclimates without the need for extensive physiological measurements in the laboratory. Model predictions of metabolic rate at 12°C and at 22°C were well correlated with each of the three empirical estimates. The model shows that the posture an animal assumes can influence measurements of metabolic rate. Model calculations of metabolic rate using postures ranging from a curled-up ball-like geometry to a sprawled-out, cylinder or ellipsoid geometry bracket all three sets of simultaneous empirical data taken on the same animals.Applications of the model show that it can be applied in a wide variety of circumstances to gain insight into physiological and ecological problems.

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“…In the laboratory, metabolic rate, change in body mass, and food consumption follow a circannual rhythm with the maximum and minimum values of metabolic rate preceding the maximum and minimum value of food consumption by at least one month and those of body mass by at least two months. The rhythm may be a critical mechanism that shifts energy expenditures from maintenance to production in preparation for immergence (29,115). Adult marmots decrease the time spent foraging in late summer (55, 78, 80).…”

Section: Annual Cycle Of Reproduction and Hibernationmentioning

confidence: 99%

“…lactation, growth, mate seeking) and its relationship to metabolic rate and the time budget remains to be determined. PHYSIOLOGICAL CONSTRAINTS The thermoneutral zone extends approximately from 15 to 20?C for adults and 20 to 25?C for young (29,86). Adult activity decreases when ambient temperature exceeds 20?C (5), and foraging occurs five times as frequently on cloudy as on sunny days (106).…”

Section: Daily Cyclesmentioning

confidence: 99%

Social and Population Dynamics of Yellow-Bellied Marmots: Results from Long-Term Research

Armitage¹

1991

Annu. Rev. Ecol. Syst.

162

104

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Oxygen consumption and body temperature in yellow-bellied marmot populations from montane-mesic and lowland-xeric environments

Cited by 29 publications

References 36 publications

Coupled dynamics of body mass and population growth in response to environmental change

Coupled dynamics of body mass and population growth in response to environmental change

Endotherm Energetics - From a Scalable Individual-Based Model to Ecological Applications

Social and Population Dynamics of Yellow-Bellied Marmots: Results from Long-Term Research

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