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Evolution

Title:		Components of reproductive isolation between North American pheromone strains of the European corn borer
Author(s):		Dopman EB; Robbins PS; Seaman A;
Address:		"Department of Biology, Tufts University, 163 Packard Avenue, Medford, Massachusetts 02155, USA. erik.dopman@tufts.edu"
Journal Title:		Evolution
Year:		2010
Volume:		20091106
Issue:		4
Page Number:		881 - 902
DOI:		10.1111/j.1558-5646.2009.00883.x
ISSN/ISBN:		1558-5646 (Electronic) 0014-3820 (Print) 0014-3820 (Linking)
Abstract:		"Of 12 potential reproductive isolating barriers between closely related Z- and E-pheromone strains of the European corn borer moth (Ostrinia nubilalis), seven significantly reduced gene flow but none were complete, suggesting that speciation in this lineage is a gradual process in which multiple barriers of intermediate strength accumulate. Estimation of the cumulative effect of all barriers resulted in nearly complete isolation (>99%), but geographic variation in seasonal isolation allowed as much as approximately 10% gene flow. With the strongest barriers arising from mate-selection behavior or ecologically relevant traits, sexual and natural selection are the most likely evolutionary processes driving population divergence. A recent multilocus genealogical study corroborates the roles of selection and gene flow (Dopman et al. 2005), because introgression is supported at all loci besides Tpi, a sex-linked gene. Tpi reveals strains as exclusive groups, possesses signatures of selection, and is tightly linked to a QTL that contributes to seasonal isolation. With more than 98% of total cumulative isolation consisting of prezygotic barriers, Z and E strains of ECB join a growing list of taxa in which species boundaries are primarily maintained by the prevention of hybridization, possibly because premating barriers evolve during early stages of population divergence"
Keywords:		"Animals Circadian Rhythm Evolution, Molecular Female *Gene Flow *Genetic Speciation Germ Cells/physiology Infertility Male Moths/*physiology North America Pheromones/*physiology Reproduction/genetics Seasons *Sexual Behavior, Animal;"
Notes:		"MedlineDopman, Erik B Robbins, Paul S Seaman, Abby eng F32 GM080090/GM/NIGMS NIH HHS/ F32 GM080090-01/GM/NIGMS NIH HHS/ Research Support, N.I.H., Extramural 2009/11/10 Evolution. 2010 Apr 1; 64(4):881-902. doi: 10.1111/j.1558-5646.2009.00883.x. Epub 2009 Nov 6"