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J Econ Entomol

Title:		"Evidence for limited spatial spread in an exotic longhorn beetle, Tetropium fuscum (Coleoptera: Cerambycidae)"
Author(s):		Rhainds M; Mackinnon WE; Porter KB; Sweeney JD; Silk PJ;
Address:		"Natural Resources Canada, Canadian Forest Service-Atlantic Forestry Centre, P.O. Box 4000, Fredericton, New Brunswick, Canada, E3B 5P7. mrhainds@nrcan.gc.ca"
Journal Title:		J Econ Entomol
Year:		2011
Volume:		104
Issue:		6
Page Number:		1928 - 1933
DOI:		10.1603/ec11078
ISSN/ISBN:		0022-0493 (Print) 0022-0493 (Linking)
Abstract:		"The longhorn beetle Tetropium fuscum F. (Coleoptera: Cerambycidae) has become established in Nova Scotia, Canada, where it coexists with Tetropium cinnamopterum Kirby. The two Tetropium species share a similar ecological niche and use the same volatile cues for mate attraction. Exotic T. fuscum was introduced near Halifax, Nova Scotia, in approximately 1990, but the rate of its spread 20 yr later has not been documented. We report a large-scale, 3-yr study that investigates the distribution of T. fuscum relative to its site of introduction. Traps baited with male-produced pheromone and host volatiles were used to estimate the relative abundance of the two Tetropium species. Adult T. fuscum emerged 1-2 wk earlier than T. cinnamopterum each year between 2008 and 2010. The spatial distribution of T. fuscum was characterized by a sharp decline in abundance in relation to its point of introduction, up to a threshold distance of approximately 80 km beyond which T. fuscum is rare in comparison with native T. cinnamopterum. The restricted range of T. fuscum 20 yr after its introduction may be attributed to limited dispersal of adults or reproductive failures of low-density populations. The distribution of T. fuscum seemed stable between 2008 and 2010. In 1 of 3 yr, the abundance of T. cinnamopterum increased with the distance to the site of introduction of T. fuscum, which suggests competitive interactions between the two Tetropium species"
Keywords:		Animals Coleoptera/drug effects/*physiology Competitive Behavior Introduced Species Male Nova Scotia Pheromones/pharmacology Picea Population Dynamics Seasons Species Specificity;
Notes:		"MedlineRhainds, Marc Mackinnon, Wayne E Porter, Kevin B Sweeney, Jon D Silk, Peter J eng Research Support, Non-U.S. Gov't England 2012/02/04 J Econ Entomol. 2011 Dec; 104(6):1928-33. doi: 10.1603/ec11078"