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Saproxylic community, guild and species responses to varying pheromone components of a pine bark beetle

Published online by Cambridge University Press:  01 March 2013

Iñaki Etxebeste*
Affiliation:
Sustainable Forest Management Research Institute, University of Valladolid -CIFOR-INIA, Avd. Valladolid 44, 34004 Palencia, Spain
José L. Lencina
Affiliation:
Department of Zoology and Physical Anthropology, University of Murcia, Apdo. 4021. 30071 Murcia, Spain
Juan Pajares
Affiliation:
Sustainable Forest Management Research Institute, University of Valladolid -CIFOR-INIA, Avd. Valladolid 44, 34004 Palencia, Spain
*
*Author for correspondence: Phone: +34 679 00 22 88 Fax: +34 979 10 84 19 E-mail: inaki@goisolutions.net

Abstract

Some bark beetle species (Coleoptera: Scolytinae) produce aggregation pheromones that allow coordinated attack on their conifer hosts. As a new saproxylic habitat is founded, an assemblage of associated beetles kairomonally respond to bark beetle infochemicals. Ips sexdentatus is one of the major damaging insects of Pinus spp. in Southern Europe. Its response to varying ipsenol (Ie) percentages in relation to ipsdienol (Id) was studied in northwestern Spain, along with the entire saproxylic beetle assemblage captured at multiple-funnel traps. Response profile modeling was undertaken for I.sexdentatus sexes and sex-ratios, associated species and for selected trophic groups using a reference Gaussian model. In addition, the effects on the saproxylic assemblages were analyzed. I. sexdentatus response curve peaked at 22.7% Ie content, while remaining taxa that could be modeled, peaked above ca. 40% Ie. Predator guilds showed a linear relationship with Ie proportion, while competitors showed a delayed response peak. Consequently, species assemblages differed markedly between varying pheromone component mixtures. Given that the evaluated pheromonal proportions mimicked that of logs being colonized by I. sexdentatus, results suggested that the registered differential responses at different levels might provide I.sexdentatus with a temporal window that maximizes conspecific attraction while reducing interference with competitor and predatory guilds. Described responses might help improve the monitoring of the population status of target bark beetles and their associates, but also point toward the by-catch of many natural enemies, as well as rare saproxylic beetle species, interfering with the aims of sustainable forest management.

Type
Research Paper
Copyright
Copyright © Cambridge University Press 2013 

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