Brain Control of Mating Behavior in the Male Cricket Gryllus bimaculatus DeGeer : Excitatory Control of Copulatory Actions(Physiology)

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概要

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• To understand the functional role of the insect brain in mating behavior, copulatory actions in response to a model stimulus were compared between intact and decerebrated male crickets. Decerebrated males were then tested to examine whether their copulatory actions were modifed by biogenic amines or electrical stimulation. The main difference in copulatory actions between intact and decerebrated males was in the body thrusts consisting of the protraction and retraction of the abdomen for hooking. These movements became slower after the removal of the brain, as measured by the average interval between responses, called the cycle length. The cycle length increased to twice the length in intact males within about 20 min. Intraperitoneal injection of octopamine in decerebrated males shortened the cycle length dose-dependently (10^<-6>-10^<-2>M) and restored it nearly to the level in intact males at 10^<-4->-10^<-2>M. Octopamine-mimicking agents forskolin, IBMX and synephrine, and cyclic AMP analogue DB-cyclic AMP had effects similar to that of octopamine, while serotonin, dopamine, noradrenaline and adrenaline did not. Electrical stimulation of the neck connectives mimicked the effect of octopamine, which was blocked by octopamine antagonist phentolamine. Perfusion of the hemocoel with Ringer's solution to eliminate the octopamine previously injected abolished the effect of extrinsic octopamine, whereas it did not abolish the effect of electrical stimulation. These results suggest that the brain in the male cricket is involved in facilitating the activity of the pattern generator for mating behavior via intraganglionic octopamine.

• 社団法人日本動物学会の論文
• 2001-07-01

著者

• Sakai M

  Okayama Univ. Okayama Jpn

• Sakai Masaki

  Department Of Biology Faculty Of Science Okayama University

• Matsumoto Y

  Graduate School Of Life Science Tohoku University:jsps

• Matsumoto Yukihisa

  Department of Biology, Faculty of Science, Okayama University

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