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Specialization, Speciation, and RadiationThe Evolutionary Biology of Herbivorous Insects$
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Kelley Tilmon

Print publication date: 2008

Print ISBN-13: 9780520251328

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520251328.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 18 September 2021

Introgression and Parapatric Speciation in a Hybrid Zone

Introgression and Parapatric Speciation in a Hybrid Zone

(p.69) Six Introgression and Parapatric Speciation in a Hybrid Zone
Specialization, Speciation, and Radiation

J. Mark Scriber

Gabe J. Ording

Rodrigo J. Mercader

University of California Press

Hybridization has been recognized as a potent evolutionary force that rapidly can generate new (novel) gene combinations for adaptive evolution and speciation. However, others have historically viewed it as a minor evolutionary force (barring allopolyploids in plants), or simply as a local or transient type of evolutionary noise or dead end. While definitive proof is generally lacking, especially for animals, diploid hybrid recombinant speciation may represent a mechanism of evolution of new species, especially if it occurs rapidly. The rarity of animal hybrid speciation may be partly due to the difficulty in detection of hybrids (until the use of recent technological tools). This chapter explores introgression and parapatric speciation in a hybrid zone. First, it describes hybrid zones and “evolutionary novelties,” and then discusses isolation, climate warming, thermal constraints, voltinism, diapause, genetics of diapause regulation, and non-concordant steep clines for species-diagnostic allozymes. Finally, the chapter studies the tiger swallowtail butterflies, and the hybrid Papilio populations and species.

Keywords:   Papilio, introgression, hybrid zones, tiger swallowtail butterflies, parapatric speciation, evolutionary novelties, isolation, climate warming, voltinism, allozymes

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