Two clinal trends in male-male aggressiveness in a subsocial spider mite (Schizotetranychus miscanthi) |
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Authors: | Yutaka Saito Ken Sahara |
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Institution: | (1) Hokkaido University, Kita-ku, Sapporo 060-8589, Japan Tel./Fax: +81-11-7063893 e-mail: yutsat@res.agr.hokudai.ac.jp, JP;(2) Laboratory of Applied Molecular Entomology Faculty of Agriculture, Hokkaido University Kita-ku, Sapporo 060-8589, Japan, JP |
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Abstract: | We studied the correlation between male-male aggressive behavior of the spider mite, Schizotetranychus miscanthi and winter coldness, a factor hypothesized to correlate with the degree of relatedness of the interacting males through the
frequent occurrence of mother-son mating in the spring. Thirty-one samples from various populations throughout Japan were
added to previous data. A cluster analysis revealed two clinal trends for male-male aggression in S. miscanthi in regions of light or no snowfall. The two clines may represent a dimorphism within the species, each having a similar clinal
trend within Japan. Further support for the hypothesis that male overwintering survival affects male-male aggressiveness came
from a comparison between regions of heavy snowfall and those of light or no snowfall. In regions with heavy snow insulation,
overwintering survival may not be as high as in other areas, and there was no correlation between male aggressiveness and
the minimum winter temperature. However, there was a significant correlation in regions of light snow.
Received: 26 May 1998 / Received in revised form: 16 December 1998 / Accepted: 30 December 1998 |
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Keywords: | Acari Male aggressive behavior Tetranychidae Kin selection Snowfall Overwintering |
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