« Previous AbstractProliferation and apoptosis in the mouse vomeronasal organ during ontogeny    Next AbstractProtein profiling and tps23 induction in different maize lines in response to methyl jasmonate treatment and Diabrotica virgifera infestation »

Oecologia

Title:		"Spruce budworm impact, abundance and parasitism rate in a patchy landscape"
Author(s):		Cappuccino N; Lavertu D; Bergeron Y; Regniere J;
Address:		"Department of Zoology, University of Texas at Austin, Austin, TX 78712, USA, , , , , , US. Groupe de Recherche en Ecologie forestiere, Universite du Quebec a Montreal, CP 8888, succ. Centre-ville, Montreal (Quebec) H3C 3P8, Canada, , , , , , CA. Canadian Forest Service, P.O. Box 3800, Ste-Foy (Quebec) G1V 4C7, Canada, , , , , , CA"
Journal Title:		Oecologia
Year:		1998
Volume:		114
Issue:		2
Page Number:		236 - 242
DOI:		10.1007/s004420050441
ISSN/ISBN:		1432-1939 (Electronic) 0029-8549 (Linking)
Abstract:		"The hypothesis that vegetational diversity may lessen the impact of forest insect pests by favoring natural enemies is appealing to those who seek ecologically sound solutions to pest problems. We investigated the effect of forest diversity on the impact of the spruce budworm Choristoneurafumiferana following the last outbreak, as well as the budworm's current abundance and parasitism rate, in the boreal forest of northwestern Quebec. Mortality of balsam fir caused by the budworm was greater in extensive conifer stands than either in 'habitat islands' of fir surrounded by deciduous forest or on true islands in the middle of a lake. Adult spruce budworm abundance, assessed by pheromone traps, did not differ significantly between the three types of sites. Larval and pupal parasitism rates were examined by transferring cohorts of laboratory-reared larvae and pupae to trees in the three site types and later collecting and rearing them. The tachinid Actiainterrupta, a parasitoid of fifth and sixth instar larvae, as well as the ichneumonid pupal parasitoids Itoplectesconquisitor, Ephialtesontario and Phaeogenesmaculicornis, caused higher mortality in the habitat islands than on true islands or in extensive stands. Exochusnigripalpistectulum, an ichneumonid that attacks the larvae and emerges from the pupae, caused greater mortality in the extensive stands of conifers"
Keywords:		Boreal forest Choristoneura fumiferana Enemies hypothesis Key wordsAbiesbalsamea Landscape diversity;
Notes:		"PubMed-not-MEDLINECappuccino, Naomi Lavertu, Denis Bergeron, Yves Regniere, Jacques eng Germany 1998/04/01 Oecologia. 1998 Apr; 114(2):236-242. doi: 10.1007/s004420050441"