The effects of body size on mate choice in a grapsid crab,Gaetice depressus (Crustacea,Decapoda) |
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Authors: | Yasuo Fukui |
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Institution: | (1) Department of Zoology, Faculty of Science, Kyoto University, 606-01 Sakyo, Kyoto, Japan |
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Abstract: | Male and female mate choices were investigated in the grapsid crab,Gaetice depressus (Crustacea, Decapoda) in a laboratory experiment. Males mated indiscriminately with regard to the body size of the females,
and frequently copulated with the first females they encountered. In contrast, females showed mate discrimination with regard
to the body size of males. The females tended to sample potential mates prior to copulation, and showed both a preference
for the larger males and a tendency toward the rejection of males with body sizes smaller than their own. However, they did
not discriminate between two males that were either larger or smaller than they themselves. Mate choice by the females of
this species is though to be based upon threshold-criterion tactics, in which the body size of the female itself is used as
a threshold value. |
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Keywords: | |
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