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3 results for “male ground squirrels”
Senescence and the stress axis in male ground squirrels
<p>A critical time in the life of a male occurs at reproduction when his behavior, physiology, and resources must be brought to bear for the central purpose of his life. We ask whether reproduction results in dysfunction of the stress axis, is linked to life history, and causes senescence. We assessed if deterioration in the axis underlies variation in reproductive lifespan in males of 5 species of North American ground squirrels whose life history varies from near semelparity to iteroparity. The most stressful and energy-demanding time occurs in spring during the intense 2–3 week breeding competition just after arousal from hibernation. We compared their stress axis functioning before and after the mating period using a hormonal challenge protocol. We found no evidence of stress axis dysfunction nor was there a relationship between reproductive lifespan and stress axis functional deterioration. Moreover, there was no consistent relationship between free cortisol levels and downstream measures. Thus, stress axis function was not traded off to promote reproduction and conclude that it is a pre-requisite for life. Hence, it functions as a constraint and does not undergo senescence.</p>
Senescence and the stress axis in male ground squirrels
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Data from: A shortage of males causes female reproductive failure in yellow ground squirrels
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International Brain Laboratory public data
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OpenNeuro
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