Variable Selection and the Coexistence of Multiple mimetic forms of the Butterfly Heliconius numata |
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Authors: | Mathieu Joron Ian R Wynne Gerardo Lamas James Mallet |
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Institution: | (1) Institut des Sciences de l'Evolution, Université de MontpellierII, Place E. Bataillon, F-34095 Montpellier, France;(2) Department of Biology, University College London, 4, Stephenson Way, London, NW1 2HE, UK;(3) Departamento de Entomología, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Apartado 14-0434, Lima-, 14, Peru;(4) Inst. Evol. Ecol. Sciences, Univ. Leiden, PO BOX 9516, 2300 RA Leiden, The Netherlands) |
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Abstract: | Polymorphism in aposematic animals and coexistence of multiple mimicry rings within a habitat are not predicted by classical
Müllerian mimicry. The butterfly Heliconius numata Cramer (Lepidoptera: Nymphalidae; Heliconiinae) is both polymorphic and aposematic. The polymorphism is due to variation
at a single locus (or `supergene') which determines colour patterns involved in Müllerian mimicry. We sampled 11 sites in
a small area (approx. 60×30km) of North-eastern Peru for H. numata and its co-mimics in the genus Melinaea and Athyrtis (Ithomiinae), and examined the role of temporal and spatial heterogeneity in the maintenance of polymorphism. Colour-patterns
of Melinaea communities, which constitute the likely `mimetic environment' for H. numata, are differentiated on a more local scale than morphs of H. numata, but the latter do show a strong and significant response to local selection for colour-pattern. In contrast, analysis of
enzyme polymorphism in H. numata across the region revealed no spatial structure, which is consistent with a high mobility of this species. Differences in
spatial variability in the two taxa may have caused H. numata to become polymorphic, while temporal variability, not significant in this study, probably has a lesser effect. The mimetic
polymorphism is therefore explained by means of multiple selection-migration clines at a single locus, a similar process to
that which explains narrow hybrid zones between geographic races of other Heliconius butterflies.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Heliconius numata Melinaea Ithomiinae aposematism Müllerian mimicry polymorphism spatial heterogeneity frequency-dependent selection population genetic structure |
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