Besouros Copro-Necrófagos (coleoptera: scarabaeidae stricto sensu) Coletados em Ecótono Natural de Campo e Mata em Bagé, RS
AbstractCopro-necrophagous beetles (Coleoptera: Scarabaeidae stricto sensu)collected in camp and forest natural ecotone in Bagé, RS. The dung beetlesare extremely important as decomposers, natural enemies of coprobiontpests and environmental indicators. They have great benefit to the livestockagroecosystems, acting in the destruction of fecal masses and carcasses ofanimals, helping with the natural biological control of parasites of cattlethat develop in these materials. However, no research was done in thecountry region of Rio Grande do Sul about the response of dung beetlescommunitys to a natural forest and native pasture ecotone that occursthere. Thus, a survey of dung beetles occurring in that ecotone wasconducted on the Rural Campus of the Universidade in the country region,Bagé, on October, 2007. Eighteen pitfall traps were utilized to collect thedung beetles, and were distributed in three parallel transects, with nine ineach environment, baited with fresh fecal mass and decomposed liver ofcattle. Three collections with hopes of a 48h and one after 120h wereconducted. Were captured 250 dung beetles of 16 species, and the speciesmore abundant were Canthon rutilans Laporte, 1840 (131 individuals) andAteuchus aff. robustus, Harold, 1868 (39 individuals). The forest area showedhigher number of species and individuals than the native pasture area andedge area. Nevertheless, the border area showed higher rates of diversity thanthe other ecosystems. The presence of border had an effect so pronounced asthe environment type on the abundance and distribution of the collecteddung beetles species. New specie was recorded for the city of Bagé.
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