Serotonin-induced mate rejection in the female cabbage butterfly, <Emphasis Type="Italic">Pieris rapae crucivora</Emphasis> |
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Authors: | Yoshiaki Obara Yuya Fukano Kenta Watanabe Gaku Ozawa Ken Sasaki |
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Institution: | (1) Behavioral Biology, Department of Agriculture, Tokyo University of Agriculture and Technology, Fuchu Tokyo, 183-8509, Japan;(2) Department of Biology, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan;(3) Department of Applied Bioscience, Human Information Systems, Kanazawa Institute of Technology, 3-1 Yakkaho, Hakusan Ishikawa, 924-0834, Japan; |
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Abstract: | Virgin female cabbage butterflies, Pieris rapae crucivora, accept and mate with courting males, whereas mated females reject them and assume the “mate refusal posture”. This study
tested whether the biogenic amines, serotonin (5HT), dopamine (DA), and octopamine (OA), were responsible for this change
in behavior. The results showed that 2–3-day-old virgin females fed with 5HT rejected courting males significantly more frequently
compared with controls fed on sucrose. In contrast, the proportions of courting males rejected by virgin females fed with
either DA or OA did not differ from sucrose-fed controls. Oral application of each amine resulted in significantly increased
levels of the amine applied (or its metabolite) in the brain. The results strongly suggest that 5HT or a 5HT metabolite may
be responsible for the post-mating change in behavioral response of 2–3-day-old virgin females to courting males. Similar
effects of 5HT treatment were observed in 6–8-day-old virgin females, but in this case the results were only marginally different
from the controls, suggesting that the effect may decline with increasing female age. |
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