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The ecological and evolutionary cons...

University of California, Riverside.

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The ecological and evolutionary consequences of Wolbachia infection in Trichogramma species.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The ecological and evolutionary consequences of Wolbachia infection in Trichogramma species./
作者:	Russell, James Emmert.
面頁冊數:	146 p.
附註:	Adviser: Richard Stouthamer.
Contained By:	Dissertation Abstracts International70-01B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3345253
ISBN:	9781109900736

The ecological and evolutionary consequences of Wolbachia infection in Trichogramma species.
Russell, James Emmert.

The ecological and evolutionary consequences of Wolbachia infection in Trichogramma species. - 146 p.

Adviser: Richard Stouthamer.

Thesis (Ph.D.)--University of California, Riverside, 2008.

Wolbachia are maternally-inherited reproductive symbionts in an estimated 20% of all insect species. There is every reason to believe maternally inherited Wolbachia have the potential to shape the evolution of their animal hosts. From behavioral modifications to phylogenetic relationships, my research aims to describe the extent of Wolbachia's ecological and evolutionary influence on several species of wasps in the genus Trichogramma. Wolbachia infection in Trichogramma induces parthenogenesis in which virgin females produce daughters. In the first chapter the low frequency Wolbachia infection in Trichogramma kaykai is utilized as a model to examine the ecological factors that play important roles in the fitness of the symbiosis. As a sex ratio distorting symbiont Wolbachia both affects and is affected by the mating structure of its host. Genetic analysis of the T kaykai population suggests infected females provide mating opportunities for outcrossing males; but sex ratio selection in the population is limited by precise sex allocation and a fitness cost associated with Wolbachia infection. Host-symbiont interactions are explicitly explored in the second chapter using the same model symbiosis. A factorial 4x4 design was employed to partition the relative influence of host, symbiont, and interaction between the two on the fitness of the symbiosis. Significant host effects for all variables suggest the fitness of the symbiosis is largely a function of host genotype. But significant symbiont and interaction effects for some variables mean the symbiosis cannot be characterized by host genotype alone; and coadaptation between host and symbiont genomes may play an important role in the evolution of the symbiosis. The ecological and evolutionary information from the first two chapters was used to address the potential long-term effects of Wolbachia infection in other Trichogramma species. The loss of female sexual function in Trichogramma pretiosum was examined through a series of genetic crossing experiments. A dominant nuclear mutation, resulting from sex ratio selection and genetic conflict between Trichogramma and Wolbachia, can explain the complete loss of female sexual function. In the final chapter the phylogentic evidence for Trichogramma-Wolbachia evolution suggests host-symbiont coevolution is the likely outcome of the Wolbachia infection in Trichogramma.

ISBN: 9781109900736Subjects--Topical Terms:

1017726
Biology, Ecology.

The ecological and evolutionary consequences of Wolbachia infection in Trichogramma species.
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