Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/7277
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Incomplete sexual isolation in sympatry between subspecies of the butterfly Danaus chrysippus (L.) and the creation of a hybrid zone
Author(s): Lushai, Gugs
Smith, David A S
Gordon, Ian J
Goulson, Dave
Allen, John A
Maclean, Norman
Contact Email: dave.goulson@stir.ac.uk
Keywords: Danaus chrysippus
heterozygote excess
hybridism
sex-ratio
sexual isolation
Spiroplasma
Issue Date: Mar-2003
Date Deposited: 3-Aug-2012
Citation: Lushai G, Smith DAS, Gordon IJ, Goulson D, Allen JA & Maclean N (2003) Incomplete sexual isolation in sympatry between subspecies of the butterfly Danaus chrysippus (L.) and the creation of a hybrid zone. Heredity, 90 (3), pp. 236-246. https://doi.org/10.1038/sj.hdy.6800219
Abstract: Subspecies chrysippus, dorippus and alcippus of the butterfly Danaus chrysippus differ at three biallelic colour gene loci. They have partially vicariant distributions, but their ranges overlap over a substantial part of central and East Africa, where hybridism is commonplace. We now report that the West African subspecies alcippus differs from other subspecies, not only in nuclear genotype but also in mitochondrial haplotype in both allopatry and sympatry. The maintenance of concordant nuclear and cytoplasmic genetic differences in sympatry, and in the face of hybridisation, is prima facie evidence for sexual isolation. Other evidence that suggests alcippus may be isolated from chrysippus and dorippus include differences in sex ratio (SR), heterozygote deficiency at one site and deduced differences in patterns of migration. We suggest that, within the hybrid zone, differential infection of subspecies by a male-killing Spiroplasma bacterium causes SR differences that restrict female choice, triggering rounds of heterotypic mating and consequent heterozygote excess that is largely confined to females. The absence of these phenomena from hybrid populations that test negative for Spiroplasma supports the hypothesis. The incomplete sexual isolation and partial vicariance of alcippus suggests that it is a nascent species.
DOI Link: 10.1038/sj.hdy.6800219
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