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Sexual selection and life history ev...

Hamilton, Paul S.

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Sexual selection and life history evolution of color: Tests of evolutionary theory across biological levels of organization.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Sexual selection and life history evolution of color: Tests of evolutionary theory across biological levels of organization./
Author:	Hamilton, Paul S.
Description:	171 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2922.
Contained By:	Dissertation Abstracts International66-06B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3178242
ISBN:	9780542175596

Sexual selection and life history evolution of color: Tests of evolutionary theory across biological levels of organization.
Hamilton, Paul S.

Sexual selection and life history evolution of color: Tests of evolutionary theory across biological levels of organization. - 171 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2922.

Thesis (Ph.D.)--Arizona State University, 2005.

Two hallmarks in evolutionary theory are sexual selection and life history. This dissertation seeks to find unifying themes between these two fields. For instance, studies of sexual selection have historically examined how phenotypic traits influence reproductive success, primarily in males. Investigations of life history evolution typically examined reproductive traits and how they influence trade-offs with survival and age at maturity. A common hypothesis in the two fields is that individuals or populations which express increased levels of reproductive effort also suffer greater mortality. Males with elaborate behaviors or ornaments may be expending increased energy, be exposed to predators, and even suffer a compromised immune system. Such ideas are tested herein with lizards as a model system. The first two chapters in this dissertation deal with descriptive or methodological issues utilized for subsequent chapters. The next chapter examines how multiple phenotypic traits act synergistically to predict the ability of male tree lizards (Urosaurus ornatus) to attract a mate---a finding unique to this study. The next chapter examines how individual tree lizards use color signaling to achieve reproductive success and if this might incur increased mortality. This study found that both males and females in a natural population tended to rest on rocks that matched their own dorsal color. However, males that expressed a more dominant color were less likely to match their backgrounds, but did not suffer higher mortality. Next, a laboratory study found that tree lizards changed dorsal color to match their backgrounds. Last, a phylogenetic comparative study found that there was some limited support for the idea that elaboration of male body size did in fact lead to the evolution of lower survivorship. This study also found that there was support for a trade off between age at maturity and survivorship, or a 'live fast, die young' trade off, that was applicable to males as well as females. In summary, this dissertation took an integrative approach to the study of evolution. Two previously disparate fields, life history and sexual selection, were examined for common hypotheses, and were explored in studies of individuals, populations, and species.

ISBN: 9780542175596Subjects--Topical Terms:

1017726
Biology, Ecology.

Sexual selection and life history evolution of color: Tests of evolutionary theory across biological levels of organization.
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520 $a Two hallmarks in evolutionary theory are sexual selection and life history. This dissertation seeks to find unifying themes between these two fields. For instance, studies of sexual selection have historically examined how phenotypic traits influence reproductive success, primarily in males. Investigations of life history evolution typically examined reproductive traits and how they influence trade-offs with survival and age at maturity. A common hypothesis in the two fields is that individuals or populations which express increased levels of reproductive effort also suffer greater mortality. Males with elaborate behaviors or ornaments may be expending increased energy, be exposed to predators, and even suffer a compromised immune system. Such ideas are tested herein with lizards as a model system. The first two chapters in this dissertation deal with descriptive or methodological issues utilized for subsequent chapters. The next chapter examines how multiple phenotypic traits act synergistically to predict the ability of male tree lizards (Urosaurus ornatus) to attract a mate---a finding unique to this study. The next chapter examines how individual tree lizards use color signaling to achieve reproductive success and if this might incur increased mortality. This study found that both males and females in a natural population tended to rest on rocks that matched their own dorsal color. However, males that expressed a more dominant color were less likely to match their backgrounds, but did not suffer higher mortality. Next, a laboratory study found that tree lizards changed dorsal color to match their backgrounds. Last, a phylogenetic comparative study found that there was some limited support for the idea that elaboration of male body size did in fact lead to the evolution of lower survivorship. This study also found that there was support for a trade off between age at maturity and survivorship, or a 'live fast, die young' trade off, that was applicable to males as well as females. In summary, this dissertation took an integrative approach to the study of evolution. Two previously disparate fields, life history and sexual selection, were examined for common hypotheses, and were explored in studies of individuals, populations, and species.
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