Fat or lean: adjustment of endogenous energy stores to predictable and unpredictable changes in allostatic load ...

• Main Authors: Schultner, Jannik, Kitaysky, Alexander S., Welcker, Jorg, Hatch, Scott
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Zenodo 2013
• Subjects: allostasis; anorexia; base-line; baseline corticosterone; black-legged kittiwake; body condition; body-mass changes; environmental conditions; fitness; food availability; food stress; guillemots uria-lomvia; kittiwakes rissa-tridactyla; life history; physiological stress; population processes; reproductive-performance; seasonal-changes; trade-offs; wing loading; Biodiversity; Mammalia; Chiroptera; Chordata; Animalia; bats; bat; Black-legged Kittiwake; rissa tridactyla; Uria lomvia; uria
• Online Access: https://dx.doi.org/10.5281/zenodo.13535641; https://zenodo.org/doi/10.5281/zenodo.13535641

(Uploaded by Plazi for the Bat Literature Project) The ability to store energy endogenously is an important ecological mechanism that allows animals to buffer predictable and unpredictable variation in allostatic load. The secretion of glucocorticoids, which reflects changes in allostatic load, is suggested to play a major role in the adjustment of endogenous stores to these varying conditions. Although crucially important, the relationship between allostatic load and energy stores remains largely unexplored. Two contrasting hypotheses describe how stores may be adjusted: animals may use low allostatic loads to increase stores to a maximum possible (fat and fit), or they can attain a lean physique due to fitness advantages of a low body mass (lean and fit). We compiled observational and experimental data available for a long-lived seabird to examine the relationship between glucocorticoids and stored energy at two life history stages (incubation and chick-rearing). Data were collected across multiple years ...