國立虎尾科技大學 |

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

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Interaction Between Stress and Reproduction :/
Reminder of title:	A Physiological Life-History Perspective.
Author:	Abolins-Abols, Mikus.
Description:	1 online resource (245 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 79-03(E), Section: B.
Contained By:	Dissertation Abstracts International79-03B(E).
Subject:	Behavioral sciences. -
Online resource:	click for full text (PQDT)
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. - 1 online resource (245 pages)

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

Thesis (Ph.D.)

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355306804Subjects--Topical Terms:

1148596
Behavioral sciences.
Index Terms--Genre/Form:

554714
Electronic books.

Interaction Between Stress and Reproduction : = A Physiological Life-History Perspective.
LDR:03423ntm a2200361Ki 4500 001 910964
005 20180517120325.5
006 m o u
007 cr mn||||a|a||
008 190606s2017 xx obm 000 0 eng d
020 $a 9780355306804
035 $a (MiAaPQ)AAI10624679
035 $a (MiAaPQ)indiana:14926
035 $a AAI10624679
040 $a MiAaPQ $b eng $c MiAaPQ
099 $a TUL $f hyy $c available through World Wide Web
100 1 $a Abolins-Abols, Mikus. $3 1182517
245 1 0 $a Interaction Between Stress and Reproduction : $b A Physiological Life-History Perspective.
264 0 $c 2017
300 $a 1 online resource (245 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertation Abstracts International, Volume: 79-03(E), Section: B.
500 $a Adviser: Ellen D. Ketterson.
502 $a Thesis (Ph.D.) $c Indiana University $d 2017.
504 $a Includes bibliographical references
520 $a 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.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Behavioral sciences. $3 1148596
650 4 $a Endocrinology. $3 645497
650 4 $a Evolution & development. $3 1178838
655 7 $a Electronic books. $2 local $3 554714
690 $a 0602
690 $a 0409
690 $a 0412
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Indiana University. $b Biology. $3 1182518
773 0 $t Dissertation Abstracts International $g 79-03B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10624679 $z click for full text (PQDT)