Age, state, environment, and season dependence of senescence in body mass

Ecology and Evolution
Svenja B KroegerJulien G A Martin

Abstract

Senescence is a highly variable process that comprises both age-dependent and state-dependent components and can be greatly affected by environmental conditions. However, few studies have quantified the magnitude of age-dependent and state-dependent senescence in key life-history traits across individuals inhabiting different spatially structured and seasonal environments. We used longitudinal data from wild female yellow-bellied marmots (Marmota flaviventer), living in two adjacent environments that differ in elevation and associated phenology, to quantify how age and individual state, measured as "time to death," affect body mass senescence in different environments. Further, we quantified how patterns of senescence differed between two biologically distinct seasons, spring, and late summer. Body mass senescence had an age-dependent component, expressed as a decrease in mass in old age. Overall, estimated age-dependent senescence was greater in females living in the more favorable lower elevation environment, than in the harsher higher elevation environment, and greater in late summer than in spring. Body mass senescence also had a state-dependent component, captured by effects of time to death, but only in the more favorable...Continue Reading

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Citations

Jan 2, 2019·Ecology and Evolution·Svenja B KroegerJulien G A Martin
Mar 9, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Svenja B KroegerJulien G A Martin

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