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Energetics of breath-hold hunting: Modeling the effects of aging on foraging success in the Weddell seal by Allyson G. Hindle; Markus Horning is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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A simulation model was developed to predict age-related changes in foraging energetics of individual Weddell seals, Leptonychotes weddellii. Aging in diving animals is interesting because their characteristic cyclic sequence of apneustic hunting and eupnea should elevate oxidative stress, possibly accelerating aging. Such a hypothesis can be evaluated by modeling energetics of constrained, time-partitioned activities with well-defined costs. Three possible consequences of physiological aging in divers were specified and appraised. The model examined the potential impacts of age-related decline in muscle contractile ability, increased buoyancy, and reduced aerobic dive limit, alone and in combination, on a daily energy budget. A uniform age effect evident in model outputs is reduced foraging efficiency. The components of this net effect are exacerbated for sub-optimal behavioral-response settings or environmental conditions. The model predicts that with advancing age, efficiency declines increase for aging scenarios in the following order: simulated 'young' adults; 'old' seals with increased buoyancy; 'old' seals with reduced aerobic dive limit; 'old' seals having reduced muscle con

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Author

Allyson G. Hindle; Markus Horning

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-5193)

Published

2010

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)