title: Comparative multilocus phylogeography of two Palaearctic spruce bark beetles: influence of contrasting ecological strategies on genetic variation.
abstract: While phylogeographic patterns of organisms are often interpreted through past environmental disturbances, mediated by climate changes, and geographic barriers, they may also be strongly influenced by species-specific traits. To investigate the impact of such traits, we focused on two Eurasian spruce bark beetles that share a similar geographic distribution, but differ in their ecology and reproduction. Ips typographus is an aggressive tree-killing species characterized by strong dispersal, whereas Dendroctonus micans is a discrete inbreeding species (sib mating is the rule), parasite of living trees and a poor disperser. We compared genetic variation between the two species over both beetles' entire range in Eurasia with five independent gene fragments, to evaluate whether their intrinsic differences could have an influence over their phylogeographic patterns. We highlighted widely divergent patterns of genetic variation for the two species and argue that the difference is indeed largely compatible with their contrasting dispersal strategies and modes of reproduction. In addition, genetic structure in I. typographus divides European populations in a northern and a southern group, as was previously observed for its host plant, and suggests past allopatric divergence. A long divergence time was estimated between East Asian and other populations of both species, indicating their long-standing presence in Eurasia, prior to the last glacial maximum. Finally, the strong population structure observed in D. micans for the mitochondrial locus provides insights into the recent colonization history of this species, from its native European range to regions where it was recently introduced.
authors: Lutte Biologique et Ecologie Spatiale, Université Libre de Bruxelles, Brussels, Belgium.
authors: François
authors: F
authors: Mayer
authors: Frédéric B
authors: FB
authors: Piel
authors: Anna
authors: A
authors: Cassel-Lundhagen
authors: Natalia
authors: N
authors: Kirichenko
authors: Laurent
authors: L
authors: Grumiau
authors: Bjørn
authors: B
authors: Økland
authors: Coralie
authors: C
authors: Bertheau
authors: Jean-Claude
authors: JC
authors: Grégoire
authors: Patrick
authors: P
authors: Mardulyn
mesh_terms: D000818:Animals; D001517:Coleoptera / Q000145:classification / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000235:genetics; D014644:Genetic Variation; D005828:Genetics, Population; D006239:Haplotypes; D058974:Phylogeography; D028222:Picea; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial
keywords: Dendroctonus micans; Ips typographus; comparative phylogeography; life history traits; nuclear marker