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Differential selection and adaptatio...

Bossart, Janice Lynne.

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Differential selection and adaptation in different host environments: Genotypic and phenotypic variation in host use traits in the tiger swallowtail butterfly, Papilio glaucus L.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Differential selection and adaptation in different host environments: Genotypic and phenotypic variation in host use traits in the tiger swallowtail butterfly, Papilio glaucus L./
作者:	Bossart, Janice Lynne.
面頁冊數:	115 p.
附註:	Source: Dissertation Abstracts International, Volume: 54-10, Section: B, page: 5010.
Contained By:	Dissertation Abstracts International54-10B.
標題:	Biology, Entomology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9406462

Differential selection and adaptation in different host environments: Genotypic and phenotypic variation in host use traits in the tiger swallowtail butterfly, Papilio glaucus L.
Bossart, Janice Lynne.

Differential selection and adaptation in different host environments: Genotypic and phenotypic variation in host use traits in the tiger swallowtail butterfly, Papilio glaucus L. - 115 p.

Source: Dissertation Abstracts International, Volume: 54-10, Section: B, page: 5010.

Thesis (Ph.D.)--Michigan State University, 1993.

Host plant use by insect generalists is a function of the insect's ability to behaviorally recognize and physiologically use different host species. Hence, the evolution of host associations in phytophagous insects will depend upon the extent of adaptively significant genetic variation for these behavioral and physiological traits, and the factors maintaining this variation. Evaluating the extent of genetic variation for host preference and larval tolerance in the polyphagous, tree-feeding species, Papilio glaucus, the eastern tiger swallowtail butterfly, was the impetus for the research presented in this dissertation. Specifically, I examined whether Ohio, Georgia and Florida P. glaucus populations and families within populations responded differently to different host species, and whether the response was genetically based and adaptively significant. I compared patterns observed for this ecologically important variation with those observed for electrophoretically detectable variation.Subjects--Topical Terms:

1018619
Biology, Entomology.

Differential selection and adaptation in different host environments: Genotypic and phenotypic variation in host use traits in the tiger swallowtail butterfly, Papilio glaucus L.
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245 1 0 $a Differential selection and adaptation in different host environments: Genotypic and phenotypic variation in host use traits in the tiger swallowtail butterfly, Papilio glaucus L.
300 $a 115 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-10, Section: B, page: 5010.
500 $a Adviser: J. Mark Scriber.
502 $a Thesis (Ph.D.)--Michigan State University, 1993.
520 $a Host plant use by insect generalists is a function of the insect's ability to behaviorally recognize and physiologically use different host species. Hence, the evolution of host associations in phytophagous insects will depend upon the extent of adaptively significant genetic variation for these behavioral and physiological traits, and the factors maintaining this variation. Evaluating the extent of genetic variation for host preference and larval tolerance in the polyphagous, tree-feeding species, Papilio glaucus, the eastern tiger swallowtail butterfly, was the impetus for the research presented in this dissertation. Specifically, I examined whether Ohio, Georgia and Florida P. glaucus populations and families within populations responded differently to different host species, and whether the response was genetically based and adaptively significant. I compared patterns observed for this ecologically important variation with those observed for electrophoretically detectable variation.
520 $a Adaptively significant genetic variation for host preference and larval tolerance was present among and within P. glaucus populations. Geographic populations expressed differing abilities to recognize and use locally abundant hosts, presumably as a result of selective pressures imposed by these hosts. Significant interactions were present between host species and families, establishing that polyphagy in P. glaucus is a function of a collection of differentially adapted genotypes, rather than a single, particularly robust genotype. Physiological tradeoffs in the ability to use M. virginiana and L. tulipifera may, in part, underlie this differential performance.
520 $a The geographic differentiation observed for larval tolerance and host preference contrasted with the lack of any such pattern for electrophoretically detectable, presumably neutral variation. The electrophoretic results indicated that gene flow is common among P. glaucus families and populations. The lack of optimization across hosts, despite ample opportunity, suggested that differential selection on ecologically important variation in P. glaucus will continue to be countered by gene flow, thereby maintaining genetic variation for host-use traits. In the absence of more substantial barriers to gene flow, the eastern tiger swallowtail will continue to be comprised of a mosaic of genotypes exhibiting differing abilities to use different host species.
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