Monday, 15 November 2004 - 10:42 AM
0167

Influence of flour patch size and abundance on movement of red flour beetle, Tribolium castaneum (Coleoptera: Tenebrionidae)

Susan Romero, sreidel@ksu.edu1, James F. Campbell, campbell@usgmrl.ksu.edu2, and James Nechols, jnechols@oznet.ksu.edu1. (1) Kansas State University, Department of Entomology, 123 West Waters Hall, Manhattan, KS, (2) USDA-ARS, Grain Marketing and Production Research Center, 1515 College Ave, Manhattan, KS

Movement behavior of individuals impacts many important ecological phenomena, such as patch resource use, population spread, and metapopulation dynamics. The impact of landscape heterogeneity on movement behavior depends on the scale of the heterogeneity and the characteristics of the studied species. This scale defines the ecological neighborhood of processes, such as species interactions, foraging, and reproduction. In this study we examined the response of red flour beetle, Tribolium castaneum (Coleoptera: Tenebrionidae), to a heterogeneous landscape of flour patches. Specifically, we wanted to determine the influence of light level, patch grain size, and patch abundance on movement patterns. We quantified movement pathway parameters (e.g., velocity, net displacement, directionality, time spent in patches versus non-patches) on randomly patterned experimental micro-landscapes, keeping the extent of the micro-landscape constant while manipulating the grain size (4, 25, and 100 cm 2 ) and abundance (0, 20, and 100%) of flour habitat patches. The influence of light intensity on movement patterns in landscapes with and without flour was measured. Results to date indicate that light intensity had negligible impact on beetle movement, but the abundance of flour did influence the pattern of movement. Our results provide a baseline for additional studies on the influence of heterogeneous landscape structure on movement and oviposition that ultimately will be used to better understand and model pest population structure in food storage and processing facilities.


Species 1: Coleoptera Tenebrionidae Tribolium castaneum (red four beetle)
Keywords: movement behavior, landscape heterogeneity

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