Observations of Multiple Mating Under Field Conditions for Japanese Beetles (Popihia japonica Newman) (Coleoptera: Scarabaeidae).

The article presents a study that investigates the mating behaviors, food patch residence and mate-guarding of Japanese beetles (Popillia japonica Newman; Coleoptera: Scarabaeidae) on field conditions. The study observed 82 mating pairs of beetle and determined their pair formation and separation period for 2 days. Male and female beetles were re-mated with more than one individual. Results have shown higher instance of re-pairing on males than females, however, re-pairing is rapid on females. In food patch residence, females tend to leave in midday unlike males, which leaves on evening. Mate-guarding of male was unrelated to female's departure after broke up. It suggests that prior to these results, food patches turnovers are high and reveals a significant chance for sperm competition.