The 2005 ESA Annual Meeting and Exhibition
December 15-18, 2005
Ft. Lauderdale, FL

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Friday, December 16, 2005
D0177

Pattern of spatial heterogeneity and habitat abundance influence movement behavior of red flour beetle, Tribolium castaneum (Coleoptera: Tenebrionidae)

Susan Romero, sreidel@ksu.edu, Kansas State University, Department of Entomology, 123 West Waters Hall, Manhattan, KS, James F. Campbell, james.campbell@gmprc.ksu.edu, USDA-ARS, Grain Marketing and Production Research Center, Manhattan, KS, and James R. Nechols, jnechols@ksu.edu, Kansas State University, Dept. of Entomology, 123 West Waters Hall, Manhattan, KS.

Insects, like other animals, live in patchy and hierarchical environments and their response to this spatial heterogeneity depends on how they perceive and use landscape elements. Movement pathways can be used to provide insights into how insects perceive landscapes and how they use this information in the expression of their search strategies. We assessed the response of the red flour beetle, Tribolium castaneum, to both the abundance and patchiness of flour habitat by recording their movement pathways on experimental micro-landscapes (50 x 50 cm). The ratio of habitat to non-habitat area was held constant while the grain (grid cell) size of flour patches was varied in three treatments (10 x 10 cm, 5 x 5 cm, and 2 x 2 cm). Habitat cell locations were generated randomly resulting in landscapes with different levels of patchiness depending on the grain size. Two controls (0% and 100% habitat) provided a baseline for considering the effect of habitat abundance on behavior. Seven pathway metrics were calculated to characterize beetle movement responses on the different landscapes. Habitat abundance and landscape pattern influenced mean step length, retention time on landscape, and pathway complexity. Beetles moved more slowly and less tortuously on 100% and fragmented landscapes than on the 0%, intermediate, and clumped patterned landscapes. Currently we are exploring further the relationship between habitat abundance and pattern and how it influences movement of red flour beetles by testing additional levels of habitat abundance (10% and 30%) arranged in different spatial patterns.


Species 1: Coleoptera Tenebrionidae Tribolium castaneum (red flour beetle)
Keywords: Movement pathways