Species diversity and abundance of scarabaeoid dung beetles (Coleoptera) attracted to fresh cow dung were studied in three habitats of New Jersey: Hutcheson Memorial Forest (HMF) disturbed field, HMF old growth forest, and Rutgers University Bovine Farm. Over a one year period, baited pitfall traps yielded a total of 15,206 beetles representing at least 26 species. Onthophagus hecate was a dominant species in all three sites, accounting for 55.1% of all individuals collected. Onthophagus pennsylvanicus and Copris minutus were present in high numbers in the field, comprising 25.1% and 3.8%, respectively, of specimens collected in that habitat, while O. orpheus and C. minutus were numerous in the forest (20.8% and 13.3%, respectively). Two introduced species, Aphodius lividus (68.5%) and O. taurus (9.6%), were the most numerous species on the farm. Nine species accounted for more than 96% of all scarabaeoid dung beetles collected during the year-long study. The majority of the beetles were collected during the warmer months (May–September), with general peaks appearing to be correlated with temperature. A total of five introduced species were collected: five in the farm site, two in the field site, but none in the forest; 80% of the individuals collected on the farm were introduced.
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