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Genetic population structure of the large blue butterfly Maculinea alcon in Denmark

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Abstract

We have investigated the genetic population structure within and the genetic differentiation between local populations of the large blue butterfly Maculinea alcon throughout the Jutland peninsula. Samples were collected as eggs on foodplants (Gentiana pneumonanthe), and reared to 4th instar caterpillars in the laboratory. A significant excess of homozygotes was found for all the investigated allozyme loci in most of the populations. A North-South cline was observed for the allele frequencies at some of the loci and for several linkage groups. Because some of the allele frequency clines were parallel to clines in adult morphological variation, we interpret our results as evidence for the co-existence of at least two gene pools within the Danish Maculinea alcon populations. Multilocus electrophoretic data revealed highly positive but variable FST values, which under this scenario would reflect varying frequencies of the Maculinea gene pools across the local populations. The significantly positive FIS values indicate that these gene pools are at least partly reproductively isolated (Wahlund effect). The co-occurrence of several Maculinea alcon gene pools on many local sites in Jutland is of great importance for conservation of the fragmented Maculinea populations. Our results show that there is probably more Maculinea biodiversity to conserve than was previously thought, and suggests that extant populations are more fragmented and vulnerable than counts of flying adults or eggs on foodplants indicate.

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Authors and Affiliations

  1. Institute of Biological Sciences, Department of Ecology and Genetics, University of Aarhus, Ny Munkegade, Building 540, 8000, Aarhus, Denmark

    Rebekka M.E. Gadeberg  & Jacobus J. Boomsma

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  1. Rebekka M.E. Gadeberg
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  2. Jacobus J. Boomsma
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Gadeberg , R.M., Boomsma, J.J. Genetic population structure of the large blue butterfly Maculinea alcon in Denmark. Journal of Insect Conservation 1, 99–111 (1997). https://doi.org/10.1023/A:1018439211244

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