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Comparative phylogeography of the Ro...

DeChaine, Eric Gerald.

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Comparative phylogeography of the Rocky Mountain alpine tundra: Inferences from Parnassius smintheus (Papilionidae), Sedum lanceolatum (Crassulaceae) and Colias meadii (Pieridae).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Comparative phylogeography of the Rocky Mountain alpine tundra: Inferences from Parnassius smintheus (Papilionidae), Sedum lanceolatum (Crassulaceae) and Colias meadii (Pieridae)./
作者:	DeChaine, Eric Gerald.
面頁冊數:	175 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5318.
Contained By:	Dissertation Abstracts International64-11B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3113081

Comparative phylogeography of the Rocky Mountain alpine tundra: Inferences from Parnassius smintheus (Papilionidae), Sedum lanceolatum (Crassulaceae) and Colias meadii (Pieridae).
DeChaine, Eric Gerald.

Comparative phylogeography of the Rocky Mountain alpine tundra: Inferences from Parnassius smintheus (Papilionidae), Sedum lanceolatum (Crassulaceae) and Colias meadii (Pieridae). - 175 p.

Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5318.

Thesis (Ph.D.)--University of Colorado at Boulder, 2003.

Rocky Mountain alpine plants and insects responded to repeated cycles of habitat expansion and fragmentation throughout the Quaternary. Did the biotic pressures of specialized interactions govern the migration and genetic variation of interacting species such that populations of species co-diverged over space and time, or did species respond individually to paleoclimatic oscillations? Selection imposed by a host plant may play a major role in governing the distribution of genetic variation in phytophagous insects. However, the evolutionary influences of the host plant may only be important over short time-frames, may be diminished by the dispersal abilities of the herbivore, or may be overwritten by paleoclimatic oscillations. I evaluated the relative roles of the host plant, winged dispersal capabilities of butterflies, and paleoclimatic events on the population genetics of an alpine specialist herbivore, Parnassius smintheus (Papilionidae). I used phylogenetic and population genetic approaches to compare organelle DNA sequences for a specialist herbivore, Parnassius smintheus (Papilionidae), its host plant Sedum lanceolatum (Crassulaceae), and another alpine butterfly, Colias meadii (Pieridae) throughout the Rocky Mountains. In doing so, the biogeographic histories of each species were inferred and a comparative phylogeography for three species residing in the Rocky Mountain alpine tundra was assessed. Analyses showed that all three organisms underwent similar cycles of fragmentation and expansion from multiple interglacial refugia, but that each species responded individually to the paleoclimatic cycles. Further analysis revealed that extreme climatic events drove the expansion and contraction of populations and shaped the geographic distribution of genetic variation in P. smintheus. Because these high elevation organisms persisted in an archipelago of sky islands during the interglacials and slowly expanded down-slope during glacials, the paleoclimatic cycles acted as both an engine of diversification, through population fragmentation and genetic differentiation, and a force of genetic erosion through local extinctions.Subjects--Topical Terms:

1017726
Biology, Ecology.

Comparative phylogeography of the Rocky Mountain alpine tundra: Inferences from Parnassius smintheus (Papilionidae), Sedum lanceolatum (Crassulaceae) and Colias meadii (Pieridae).
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