KERDELHUE, Carole; MAGNOUX, Emmanuelle; LIEUTIER, François; ROQUES, Alain; ROUSSELET, Jérôme

doi:10.1038/sj.hdy.6800836

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KERDELHUE, Carole
Biodiversité, Gènes et Ecosystèmes [BioGeCo]

MAGNOUX, Emmanuelle
Unité de recherche Zoologie Forestière [URZF]

LIEUTIER, François
Laboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]

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Ce document a été publié dans

Heredity. 2006, vol. 97, n° 1, p. 38-45

Nature Publishing Group

Résumé en anglais

A parallel study of the genetic structure of two oligophagous species associated with the same hosts was conducted to determine the main factors shaping the distribution of genetic diversity. The bark beetle Tomicus piniperda and the pine processionary moth (PPM) Thaumetopoea pityocampa are both associated with the genus Pinus and belong to different guilds (xylophagous vs defoliating species). The PPM is an ectophagous species that feeds on the needles of living trees, whereas T. piniperda is endophagous and bores galleries in the inner bark of weakened trees. Both species were sampled in the main regions of France, and their genetic structure was assessed after genotyping with five microsatellite markers. Populations of the PPM were significantly structured. A pattern of isolation by distance was found when distances were calculated as bypassing the Massif Central, whereas no such pattern could be found with raw geographic distances. On the contrary, most populations of T. piniperda were not differentiated. No effect of host species could be detected in either of the two species. We conclude that the two taxa have contrasting effective dispersal rates per generation, and we hypothesize that this reflects the different selection pressures acting on individual fitness via different strategies of host use.< Réduire

Mots clés

TOMICUS PINIPERDA

RELATION HOTE-PARASITE

Mots clés en anglais

THAUMETOPOEA PITYOCAMPA

COLEOPTERE