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Hybrid queen butterflies from the cross Danaus chrysippus (L.)xD. gilippus (Cramer): confirmation of species status for the parents and further support for Haldane's Rule
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posted on 2023-06-08, 19:01 authored by David A S Smith, Ian J Gordon, Gugs Lushai, Dave GoulsonDave Goulson, John A Allen, Norman MacleanA cross between queen butterflies of the Palaeotropical species Danaus chrysippus and the Neotropical D. gilippus was achieved with difficulty in both directions. Only one progeny (N=70) was reared comprising sterile males and inviable females in a precisely 1:1 ratio. Both prezygotic and postzygotic barriers to gene flow are strong. The result supports Haldane's Rule, to which we propose a minor amendment. The F1 hybrids were intermediate for background colour between the brown (genotype BB) of gilippus and orange (genotype bb) of chrysippus. Most F1 pattern characters were also intermediate. In polymorphic chrysippus populations, because Bb heterozygotes are brown, or nearly so, we suggest the B allele may have evolved towards dominance in sympatry. Hybrid males show positive heterosis for body size. The close similarity of male genitalia between the allopatric, genetically distant species chrysippus and gilippus, compared to their divergence between gilippus and its largely sympatric sister species eresimus, suggest that reinforcement of sexual isolation or reproductive character displacement have evolved in sympatry. © 2002 The Linnean Society of London.
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Publication status
- Published
Journal
Biological Journal of the Linnean SocietyISSN
0024-4066Publisher
Blackwell PublishingExternal DOI
Issue
4Volume
76Page range
535-544Department affiliated with
- Evolution, Behaviour and Environment Publications
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- No
Peer reviewed?
- Yes
Legacy Posted Date
2014-11-26Usage metrics
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