Abstract
The dung incorporation activity of three species of coprophagous beetle macrofauna (Coleoptera: Scarabaeidae: Scarabaeinae), Dichotomius colonicus (Say), Phanaeus quadridens (Say), and Copris klugi sierrensis Matthews, was studied on a hectare of pastureland on “La Michilía” Biosphere Reserve. In total, 223 specimens of the three species were recorded. On the basis of abundance, the dominant species was D. colonicus. A substantial percentage (31% in September and 51% in October) of dung pats remained on the surface, untouched by beetles. Most of the specimens observed (92%) were found amassing dung in galleries. The dung accumulation capacity of D. colonicus varied from 5 to 135 g of dung (dry weight)/pair, whereas C. klugi sierrensis amassed an average of 24.3 ± 8.5 g/pair and P. quadridens amassed an average of 12 ± 2.5 g/pair. Based on dung burying efficiency, D. colonicus was considered the most beneficial of the three species in the study area. It dug deeper, wider galleries and incorporated the largest amount of dung into the soil.
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