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Licensed Unlicensed Requires Authentication Published by De Gruyter June 16, 2015

Comparison of pathogens infection level in Ips typographus (Coleoptera: Curculionidae) beetles sampled in pheromone traps and at place of overwintering

Karolina Lukášová and Jaroslav Holuša
From the journal Acta Parasitologica

Abstract

The importance of pathogens in the population dynamics of Ips typographus remains a subject of ongoing debate. The main objective of our experiment was to compare the pathogen infection levels of individuals overwintering in bark with the levels of individuals from the same population captured with pheromone traps and thereby to determine primary answers as to whether it can be confirmed that pathogenic organisms affect the flight ability of bark beetles or their ability to leave their places of overwintering. A total of 402 I. typographus individuals were analyzed at a study location under limited management. Three pathogens were confirmed to be present: the gregarine Gregarina typographi, the virus ItEPV, and the microsporidium Nosema typographi. Infection levels of Gregarina typographi and ItEPV were the same in beetles collected at places of overwintering and in those beetles collected in pheromone traps within the immediate vicinity. As these pathogens infect the host’s intestine, the tendency to leave the places of overwintering is apparently not diminished. A similar analysis and comparison of pathogens located in the fat body might bring different results, as our study only detected N. typographi in a single dissected adult spruce bark beetle.

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Received: 2014-11-10
Revised: 2015-2-9
Accepted: 2015-3-18
Published Online: 2015-6-16
Published in Print: 2015-9-1

© W. Stefański Institute of Parasitology, PAS