Entomology, Ornithology & Herpetology: Current Research
Open Access

Laboratory of Animal Ecology, Department of Ecology and Systematics, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan

Biography

Dr. Eisuke Hasegawa has done research on animals and mammals. Eisuke Hasegawa worked as a researcher in the Laboratory of Animal Ecology, Graduate School of Agriculture, Hokkaido University, Japan.

Publications

• Research Article   
  Aggressiveness of Males and Females of the Stag Beetle, Prosopocoilus inclinatus (Coleoptera: Lucanidae), are Mediated by Different Biogenic-amines
  Author(s): Eisuke Hasegawa* and Tatsumi Kudo
  
  Males of stag beetles have a pair of enlarged mandibles and combat with other males to defend a food site to where females will come to feed. The winner can monopolize mating with females came. However, to combat with an opponent, a male must show aggressiveness to the opponent. Females also take a similar aggressive posture with males. Recently, it has been shown that the degree of aggressiveness in insects is mediated by biogenic amines in the brain. Here, we report that the different amine pathways mediate the aggressiveness of males and females of a stag beetle, Prosopocoilus inclinatus. In males, dopamine rose up the degree of aggressiveness with concentration of the chemical, and a dopamine antagonist suppressed this effect with its concentration, indicating the mediation of the aggressiveness through the dopamine pathway. Whereas, aggressiveness of females was rose up .. View More»
  DOI: 10.35248/2161-0983.20.9.223

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