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Interaction Between Stress and Repro...

Abolins-Abols, Mikus.

Interaction Between Stress and Reproduction: A Physiological Life-History Perspective.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Interaction Between Stress and Reproduction: A Physiological Life-History Perspective.
Author:	Abolins-Abols, Mikus.
Published:	Ann Arbor : ProQuest Dissertations & Theses, 2017
Description:	245 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-03(E), Section: B.
Notes:	Adviser: Ellen D. Ketterson.
Contained By:	Dissertation Abstracts International79-03B(E).
Subject:	Behavioral sciences.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10624679
ISBN:	9780355306804

Interaction Between Stress and Reproduction: A Physiological Life-History Perspective.
Abolins-Abols, Mikus.

Interaction Between Stress and Reproduction: A Physiological Life-History Perspective. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 245 p.

Source: Dissertation Abstracts International, Volume: 79-03(E), Section: B.

Thesis (Ph.D.)--Indiana University, 2017.

Wild animals face frequent challenges to their homeostasis and survival, which they address by mounting a stress-response. An important consequence of the stress-response is the suppression of reproductive function. This has practical implications in medicine and conservation, but also plays an important role in life-history theory, where it underlies the trade-off between survival and reproduction. While the suppression of reproduction by stress has been the focus of many studies, there are nevertheless multiple unresolved questions about this interaction. First, while laboratory studies have identified candidate mechanisms through which stress suppresses reproduction, it is not clear how these mechanisms are relevant in wild animals. Second, we lack a complete understanding about why the effect of stress differs among individuals and populations. Third, the effect of stress on important components of reproduction, such as territorial behavior, is poorly understood. In my dissertation I address these questions by studying the Dark-eyed Junco (Junco hyemalis). I show that both chronic and acute stressors reduce testosterone levels in captive juncos, but that the reduction in testosterone is not explained by an increase in corticosterone, refuting a common assumption in the scientific community. This conclusion was further supported by a correlational study in the wild, where I found no evidence that these hormones interact to reduce investment in reproduction. In addition to the effects on testosterone, I show that stress has a suppressive effect on territorial behavior. However, this effect was milder in urban compared to rural populations. The effect of stressors on territorial behavior also differed among individuals: high condition individuals reduced their behavior more compared to low condition individuals. Collectively these results identify the mechanisms by which the reproductive function and stress-response interact in wild animals, and suggest that the interaction between stress and reproduction in the wild is a function of internal and environmental factors.

ISBN: 9780355306804Subjects--Topical Terms:

766163
Behavioral sciences.

Interaction Between Stress and Reproduction: A Physiological Life-History Perspective.
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