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Do males evaluate female age for precopulatory mate guarding in the two-spotted spider mite?

文献类型: 外文期刊

作者: Oku, Keiko 1 ; Saito, Yutaka 3 ;

作者机构: 1.Natl Agr & Food Res Org, Agr Res Ctr, Tsukuba, Ibaraki 3058666, Japan

2.Wageningen Univ, Entomol Lab, NL-6700 EH Wageningen, Netherlands

3.Hokkaido Univ, Sapporo, Hokkaido 0608589, Japan

4.Fujian Acad Agr Sci, Inst Plant Protect, Fujian Engn Res Ctr Nat Enemy Resources Crop Pest, Fuzhou, Peoples R China

关键词: Female age;Male choice;Optimum strategy;Precopulatory mate guarding;Tetranychidae;Tetranychus urticae

期刊名称:JOURNAL OF ETHOLOGY ( 影响因子:1.27; 五年影响因子:1.246 )

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收录情况: SCI

摘要: In the two-spotted spider mite Tetranychus ur-ticae (Acari: Tetranychidae), because only the first mating results in fertilisation, adult males guard quiescent deu-tonymph females, the stage immediately before adult emergence. Previous studies showedthat T. urticae males prefer to guard older rather than younger females. However, as previous experimental designs have included uncertain factors, findings have not always been sufficiently rigorous. Therefore, we reexamined whether T. urticae males discriminate between the females closest to becoming receptive and younger females. One male was introduced onto leaf squares with two differently aged quiescent deuton-ymph females, with time lags between the females of 3, 6, 12 or 23 h, and whether the older or younger female was, guarded was recorded. When the time lags between the females were 3, 6 or 12 h, males showed no preferences. Males preferred older females over younger ones only when the time lag was 23 h. Under non-choice conditions, fewer males guarded the 23-h younger females than other older females, suggesting that the attractiveness of the youngerfemales is weaker than older females. Our results are not fully consistent with previous studies; T. urticae males do not obviously discriminate between females closest to becoming receptive and younger females.

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