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Mating Behavior and sperm competition in fruit flies, with reference to difference between Hawaiian and Japanese melon flies.

果蝇的交配行为和精子竞争，参考夏威夷瓜蝇和日本瓜蝇的差异。

基本信息

批准号：
02044070
负责人：
ITO Yosiaki
金额：
$ 3.14万
依托单位：
Shchool of Agriculture, Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

Comparison of mating behavior of Hawaiian and Okinawan melon flies (Bactrocera cucurbitae) was made based on field and laboratory observations. In Okinawa, melon fly males form lek on non-host plants in evening and each male waits female sitting on a leaf. When a female comes the male couts and sometimes, after female mate choice, is accepted by her. In Hawaii, on the other hand, males don't form leks, but actively fly to find females. They court to sitting females. Our field studies showed that this difference is due to difference in population density in the two areas. Even in Okinawa, males seek for females when the density was low, where the wating tactics of males was not effective to find females. Thus males adaptively change their mating tactics in different social conditions.Courtship sounds of Hawaiian melon fly males were almost the same as those of Okinawan males, but there was subtle difference. Behavior and morphological characters in relation to sex pheromone emission of Hawaiian melon fly males were the same as those of Okinawan males. These facts suggest that there is no species-level difference between Hawaiian and Okinawan melon flies.Experimental studies with Okinawan melon flies showed that (1) sperm longevity in female spermathecae was short and this was important for variation of P2 values in relation to mating interval, and (2) remating of females was suppressed by long copulation, possibly due to transportation of male accessary gland substance to female body. Existence or absence of sperm in spermathecae did not affect the remating suppression.

通过野外和室内观察，比较了夏威夷瓜实蝇和冲绳瓜实蝇的交配行为。在冲绳，瓜实蝇雄性晚上在非寄主植物上形成lek，每个雄性坐在叶子上等待雌性。当一只雌性来的时候，雄性会来拜访，有时候，在雌性选择了配偶之后，雄性会被她接受。另一方面，在夏威夷，雄性不会形成Leks，而是积极地飞去寻找雌性。它们向坐着的雌性求爱。我们的实地研究表明，这种差异是由于两个地区人口密度的差异。即使在冲绳，当密度较低时，雄性也会寻找雌性，雄性的等待策略对寻找雌性并不有效。夏威夷瓜实蝇和冲绳瓜实蝇的求偶声基本相同，但也有细微的差别。夏威夷瓜实蝇雄性的行为和形态特征与冲绳雄性的相同。对冲绳瓜实蝇的实验研究表明：（1）精子在雌性受精囊中的寿命较短，这对P2值与交配间隔的关系的变化是重要的;（2）长时间交配抑制了雌性的再交配，这可能是由于雄性附属腺物质向雌性体内的运输。受精囊内精子的存在与否不影响再交配抑制。