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Physical Contests For Females In The Japanese Beetle, Popillia Japonica, Paul Switzer, Kipp C. Kruse
Physical Contests For Females In The Japanese Beetle, Popillia Japonica, Paul Switzer, Kipp C. Kruse
Paul V. Switzer
We conducted field observations of physical competition for mates, in which a single male attempts to usurp a female from another male, in male Japanese beetles, Popillia japonica Newman (Coleoptera; Scarabaeidae). Physical contests for mates were relatively rare, but when they occurred the challenger male was able to successfully takeover females by dislodging the previously paired resident male in only 18% of contests, suggesting that a substantial prior residency advantage exists in this species. Challenger males that were successful in takeover attempts were significantly larger than the resident male. In contrast, no size pattern was found between intruding males and …
The Effect Of Male And Female Body Size On Mating Behavior Of Male Fairy Shrimp, Eubranchipus Neglectus, Craig Feigenbaum, Paul V. Switzer
The Effect Of Male And Female Body Size On Mating Behavior Of Male Fairy Shrimp, Eubranchipus Neglectus, Craig Feigenbaum, Paul V. Switzer
Paul V. Switzer
We studied size-related mating patterns in the freshwater fairy shrimp Eubranchipus neglectus in the laboratory. Males were provided with relatively small or large females that they could only sense by vision. We recorded the number of times a male pursued the female (“follows”), the duration of these follows, and the number of times a male attempted to grasp the female. Relatively large males performed more mating behavior than relatively small males. Furthermore, males (regardless of their own size) exhibited more mating behavior towards large than small females. They followed large females more frequently, attempted to grasp large females more often, …