01752nas a2200181   4500008004500000020001400045245011500059210006900174260000900243300001200252490000700264520106400271653002901335100002601364700002301390700002401413856013301437       2008                        Engldsh    a0024-406600aSympatric occurrence of diverged mtDNA lineages of Pityogenes chalcographus (Coleoptera, Scolytinae) in Europe0 aSympatric occurrence of diverged mtDNA lineages of Pityogenes ch  cJune  a331-3400 v943 aDifferentiation among the European populations of the six-toothed spruce bark beetle Pityogenes chalcographus was observed for the first time in the 1970s as mating males from Northern Europe with females from Central Europe led to a significant decline in fecundity. Morphological examination revealed that P. chalcographus can be separated into two European races. Here, we investigated the genetic background of this separation by analysing 39 populations (n = 695), sequencing almost the complete cytochrome oxidase I gene (1543 bp) and applying single-strand conformation polymorphism. Phylogenetic analysis of 58 haplotypes yielded three major clades with a maximum sequence divergence of 2.33%, indicating that the demographic events took place in the late Pleistocene. These results support the hypothesis of allopatric divergence of the mtDNA lineages, which postglacially came into sympatric existence in Europe. However, as a result of partial crossing incompatibility the diverged lineages retained their genetic identity during postglacial times.10aPityogenes chalcographus1 aAvtzis, Dimitrios, N.1 aArthofer, Wolfgang1 aStauffer, Christian  uhttps://weevil.myspecies.info/sympatric-occurrence-diverged-mtdna-lineages-pityogenes-chalcographus-coleoptera-scolytinae-europe