Université de Neuchâtel

Disruptive sexual selection against hybrids contributes to speciation between Heliconius cydno and Heliconius melpomene

Naisbit, Russell. E. ; Jiggins, Chris D. ; Mallet, James

In: Proceedings of the Royal Society, 2001, vol. 268, no. 1478, p. 1849-1854

Understanding the fate of hybrids in wild populations is fundamental to understanding speciation. Here we provide evidence for disruptive sexual selection against hybrids between Heliconius cydno and Heliconius melpomene. The two species are sympatric across most of Central and Andean South America, and coexist despite a low level of hybridization. No-choice mating experiments show...

Université de Neuchâtel

Reproductive isolation caused by colour pattern mimicry

Jiggins, Chris D. ; Naisbit, Russell. E. ; Coe Rebecca L. ; Mallet, James

In: Nature, 2001, vol. 411, p. 302-305

Speciation is facilitated if ecological adaptation directly causes assortative mating, but few natural examples are known. Here we show that a shift in colour pattern mimicry was crucial in the origin of two butterfly species. The sister species Heliconius melpomene and Heliconius cydno recently diverged to mimic different model taxa, and our experiments show that their mimetic...

Université de Neuchâtel

Mimicry: developmental genes that contribute to speciation

Naisbit, Russell. E. ; Jiggins, Chris D. ; Mallet, James

In: Evolution & Development, 2003, vol. 5, no. 3, p. 269-280

Despite renewed interest in the role of natural selection as a catalyst for the origin of species, the developmental and genetic basis of speciation remains poorly understood. Here we describe the genetics of Müllerian mimicry in Heliconius cydno and H. melpomene (Lepidoptera: Nymphalidae), sister species that recently diverged to mimic other Heliconius. This mimetic shift...

Université de Neuchâtel

Sex-Linked Hybrid Sterility in a Butterfly

Jiggins, Chris D. ; Linares, Mauricio ; Naisbit, Russell. E. ; Salazar, Camilo ; Yang, Ziheng H. ; Mallet, James

In: Evolution, 2001, vol. 55, no. 8, p. 1631–1638

Recent studies, primarily in Drosophila, have greatly advanced our understanding of Haldane's rule, the tendency for hybrid sterility or inviability to affect primarily the heterogametic sex (Haldane 1922). Although dominance theory (Turelli and Orr 1995) has been proposed as a general explanation of Haldane's rule, this remains to be tested in female-heterogametic taxa, such as the...