An Analysis of Climate Induced Hybrid Speciation in Tiger Swallowtail Butterflies (Papilio). Gabriel J. Ording

ISBN: 9780549617501

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165 pages


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An Analysis of Climate Induced Hybrid Speciation in Tiger Swallowtail Butterflies (Papilio).  by  Gabriel J. Ording

An Analysis of Climate Induced Hybrid Speciation in Tiger Swallowtail Butterflies (Papilio). by Gabriel J. Ording
| NOOKstudy eTextbook | PDF, EPUB, FB2, DjVu, AUDIO, mp3, ZIP | 165 pages | ISBN: 9780549617501 | 4.49 Mb

North American Papilio canadensis and P. glaucus (Lepidoptera: Papilionodae, these Papilio = Pterourus), have been described as having allopatric distributions separated by a narrow hybrid zone. The range of hybridization is directly correlated withMoreNorth American Papilio canadensis and P. glaucus (Lepidoptera: Papilionodae, these Papilio = Pterourus), have been described as having allopatric distributions separated by a narrow hybrid zone.

The range of hybridization is directly correlated with a well-defined thermal landscape. In light of recent climate shifts, potentially associated with global warming, there have been increased levels of genetic introgression. This dissertation describes the morphological and genetic status of unique isolated hybrid swarm populations, on South Manitou Island in Michigan and in the Battenkill River Valley near the border of New York and Vermont, that have arisen near the range boundaries of these two closely related species of Tiger Swallowtail butterflies.

Climate induced genomic mixing may be responsible for climatic speciation, as appears to be occurring in a case of incipient speciation near the border of southern New York and Vermont. Additionally, it is suggested that the generation of these unique genetic populations best explains the origins of a recently described new Papilio species (Pterourus appalachiensis Pavulaan & Wright, 2002) via hybrid speciation.

Furthermore, the significance of an identified X-linked gene complex controlling both diapause and the expression of the lactate dehydrogenase enzyme is examined in laboratory crosses and is proposed as a primary mechanism in the historic maintenance of the hybrid zone and also is likely instrumental in the reported cases of hybrid speciation.



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