From the Western Alps across Central Europe: Postglacial recolonisation of the tufa stream specialist Rhyacophila pubescens (Insecta,Trichoptera) |
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Authors: | Engelhardt Christine HM Haase Peter Pauls Steffen U |
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Institution: | 1.Senckenberg, Department of Limnology and Conservation, Clamecystr. 12, 63571, Gelnhausen, Germany ;2.Biodiversity and Climate Research Centre (BiK-F) Senckenberganlage 25, D-60325, Frankfurt am Main, Germany ;3.Department of Entomology, University of Minnesota, 219 Hodson Hall, 1980 Folwell Ave, Saint Paul, MN, 55108, USA ; |
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Abstract: | Background Hybridization can have complex effects on evolutionary dynamics in ants because of the combination of haplodiploid sex-determination and eusociality. While hybrid non-reproductive workers have been found in a range of species, examples of gene-flow via hybrid queens and males are rare. We studied hybridization in East African army ants (Dorylus subgenus Anomma) using morphology, mitochondrial DNA sequences, and nuclear microsatellites. Results While the mitochondrial phylogeny had a strong geographic signal, different species were not recovered as monophyletic. At our main study site at Kakamega Forest, a mitochondrial haplotype was shared between a "Dorylus molestus-like" and a "Dorylus wilverthi-like" form. This pattern is best explained by introgression following hybridization between D. molestus and D. wilverthi. Microsatellite data from workers showed that the two morphological forms correspond to two distinct genetic clusters, with a significant proportion of individuals being classified as hybrids. Conclusions We conclude that hybridization and gene-flow between the two army ant species D. molestus and D. wilverthi has occurred, and that mating between the two forms continues to regularly produce hybrid workers. Hybridization is particularly surprising in army ants because workers have control over which males are allowed to mate with a young virgin queen inside the colony. |
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