Sex ratio and foundress number in the parasitoid wasp Bracon hebetor
Sex ratio and foundress number in the parasitoid wasp Bracon hebetor
复制标题
寄生蜂 Bracon hebetor 的性别比和母蜂数量
DOI：
10.1006/anbe.1994.1093
复制
发表时间：
1994
期刊：
影响因子：
2.5
通讯作者：
H. Godfray
中科院分区：
文献类型：
--
作者：
J. Cook;A. Lynch;H. Godfray
摘要Abstract.正如局部配偶竞争理论所预测的那样，许多寄生蜂的后代性比随着在斑块中产卵的同种雌性数量的增加而变得越来越偏向雄性。Braconid黄蜂Bracon hebetor似乎是一个例外。最近的实验表明，在同种雌性存在的情况下产卵的黄蜂比单独的黄蜂产生更多的女儿。当两个雌性一起产卵时，幼虫的竞争更加激烈，有人认为雌性在这种情况下产下的儿子较少，因为由此产生的小雄性交配成功率很低。本文报道了（1）比较了孤雌和配对B的性比。hebetor;（2）调查差异死亡率的重要性;（3）探索小型和大型黄蜂的相对交配成功率。配对和孤独的黄蜂产生相同的性别比例，并没有证据表明差异死亡率。小的男性能够交配的大型和小型的女性，至少在实验室中，似乎没有遭受与较大的男性竞争的劣势。以往对B性别比和创始人人数的分析存在统计学问题。hebetor，也有问题，作出推论适应近交系的自然远交物种。
Abstract Abstract. As predicted by the theory of local mate competition, the offspring sex ratios of many parasitoid wasps become increasingly male biased as the number of conspecific females ovipositing in a patch rises. The braconid wasp Bracon hebetor appears to be an exception. Recent experiments have suggested that wasps ovipositing in the presence of a conspecific female produce more daughters than solitary wasps. Larval competition is more intense when two females oviposit together and it has been suggested that females lay fewer sons in these circumstances because the resultant small males have poor mating success. Experiments are reported that (1) compare the sex ratio of solitary and paired B. hebetor; (2) investigate the importance of differential mortality and (3) explore the relative mating success of small and large wasps. Paired and solitary wasps produced the same sex ratio and there was no evidence of differential mortality. Small males were able to mate both large and small females and, at least in the laboratory, appeared to suffer no disadvantage in competition with larger males. There are statistical problems with some previous analyses of sex ratio and foundress number in B. hebetor, and there are also problems in making inference about adaptation from inbred strains of a naturally outbred species.