Article (Scientific journals)
Contrasting responses of saproxylic insects to focal habitat resources: The example of longhorn beetles and hoverflies in Belgian deciduous forests
Fayt, P.; Dufrêne, Marc; Branquart, E. et al.
2006In Journal of Insect Conservation, 10 (2), p. 129-150
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Keywords :
Cerambycidae; Flower resources; Microhabitat; Saproxylic; Syrphidae; Coleoptera; Fagus; Hexapoda; Insecta; Quercus
Abstract :
[en] Although both saproxylic longhorn beetles and hoverflies benefit from the presence of woody substrates for reproduction, they differ in their requirements for floral resources and for microbiotopes of overmature and senescent trees. This led us to expect contrasting responses between the two species groups in relation to these essential resources. We examined this prediction in 22 mature oak- and beech-dominated stands of southern Belgium by relating their species assemblages to local vegetation structure and composition, altitude and landscape composition. Stands were organised in pairs as a function of their overall dead wood supply. Free-hanging window traps, stump emergence traps and Malaise traps produced 30 longhorn beetle species (1637 individuals) and 106 hoverfly species (3020 individuals). Paired-comparisons controlling for annual variation in captures showed that, unlike saproxylic hoverflies, stands with dead wood hosted more species and individuals of longhorn beetles. Accordingly, the two species groups were found to be independent on ordination axes, responding to different sets of environmental conditions. While stands dominated by oaks with a high snag volume were highly favoured by longhorn beetles, saproxylic and threatened syrphids were limited to open-stands with large trees and a well-developed, species rich herb layer providing the floral resources required for their reproduction. Our results suggest that, when defining criteria to identify or restore important habitats for saproxylic insect conservation, variables related to different aspects of dead wood supply should not be the only criteria taken into account. © Springer 2006.
Disciplines :
Entomology & pest control
Environmental sciences & ecology
Author, co-author :
Fayt, P.;  Research Centre of Nature, Forests and Wood (CRNFB), Av. Maréchal Juin 23, B-5030 Gembloux, Belgium
Dufrêne, Marc  ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Biodiversité et Paysage
Branquart, E.;  Research Centre of Nature, Forests and Wood (CRNFB), Av. Maréchal Juin 23, B-5030 Gembloux, Belgium
Hastir, P.;  Biodiversity Research Centre, Catholic University Louvain (UCL), Croix du sud, 4-5, B-1348 Louvain-La-Neuve, Belgium
Pontégnie, C.;  Forest and Nature Management Unit, Gembloux Agricultural University (FSAGx), Passage des Déportés 2, B-5030 Gembloux, Belgium
Henin, J.-M.;  Forest and Nature Management Unit, Gembloux Agricultural University (FSAGx), Passage des Déportés 2, B-5030 Gembloux, Belgium
Versteirt, V.;  Department of Entomology, Royal Belgian Institute of Natural Sciences (IRSNB), Vautierstraat 29, B-1000 Brussels, Belgium
Language :
English
Title :
Contrasting responses of saproxylic insects to focal habitat resources: The example of longhorn beetles and hoverflies in Belgian deciduous forests
Publication date :
2006
Journal title :
Journal of Insect Conservation
ISSN :
1366-638X
eISSN :
1572-9753
Publisher :
Springer Science & Business Media B.V.
Volume :
10
Issue :
2
Pages :
129-150
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 24 March 2013

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