02 de novembre 2015

MASCLES DIPLOIDES DE LA VESPA VELUTINA PER ATURAR LA SEVA EXPANSIÓ

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Benvolguts lectors d'Ecolluita us passo un article relacionat amb la V. velutina força interessant. En l'article es veu que hi ha mascles diploides produïts en època avançada (abans de final d'estiu), que podrien suposar un obstacle per al desenvolupament de la colònia i que podria frenar l'expansió de l'espècie.

Informa: Roger Coromina

Abstract

The invasive yellow-legged hornet Vespa velutina nigrithorax was accidentally introduced in Europe in the early 2000s. As is the case in colonies of other wasp and hornet species, V. velutina colonies are known to produce sexuals (males and new queens) at the end of the summer. We show that early-stage colonies in French populations frequently produce males well before the usual reproductive period. The vast majority of the males produced are diploid, which is consistent with the loss of genetic diversity previously reported in introduced populations in France. Since males do not participate in colony activities, the production of early diploid males at the expense of workers is expected to hamper colony growth and, ultimately, decrease the expansion of the species in its invasive range in Europe.