MATING SYSTEM OF BRACON-HEBETOR (HYMENOPTERA, BRACONIDAE)
MATING SYSTEM OF BRACON-HEBETOR (HYMENOPTERA, BRACONIDAE)
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DOI：
10.1111/j.1365-2311.1992.tb01032.x
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发表时间：
1992-02-01
影响因子：
2.2
通讯作者：
STRAND, MR
中科院分区：
文献类型：
--
作者：
ANTOLIN, MF;STRAND, MR
1.我们报告的交配系统的一个领域人口的寄生蜂，茧蜂hebetor，对玉米桩由印度谷螟，Plodia interpunctella感染。研究表明，该种的交配系统是基于雄性争夺竞争的一夫多妻制，雄性聚集在玉米的高处.在玉米表面，成虫的性别比大于80%，而在玉米表面以下，性别比小于45%。雄性在表面上积极地追求雌性，但在求偶或交配过程中，雄性之间没有攻击性的相互作用。在玉米表面发现的大约20%的雌性受精囊中没有精子，无论年龄大小，但未交配的雌性数量在当天晚些时候减少。在实验室的研究中，我们发现这个种群中的雌性产卵的性别比例是有偏差的，只有14%的雌性在从它们的出生地分散之前交配。因此，同胞交配是不太可能在这个群居寄生蜂。这种异交交配系统可能是由于B严重的近交衰退而产生的。hebetor通过性别基因座遭受：在性别基因座杂合的二倍体发育成雌性，但纯合二倍体是雄性并且通常不能存活。雌性偏向的性别比例可能是在B进化而来的。Hebetor是对雄性是更昂贵的性别，雌性比雄性更频繁地从种群中分散，或者种群中一小部分雌性未交配的反应。
1. We report on the mating system of a field population of the parasitic wasp, Bracon hebetor, on a corn pile infested by the Indian meal moth, Plodia interpunctella. We demonstrate that the mating system is based upon male scramble competition polygyny with male aggregations on high places on the corn.2. The sex ratio among adults was greater than 80% males on the surface of the corn, whereas below the surface the sex ratio was less than 45%. Males actively courted females on the surface, but there were no aggressive interactions among males during courtship or mating.3. Approximately 20% of the females found on the surface of the corn had no sperm in their spermathecae, regardless of age, but the numbers of unmated females decreased later during the day.4. In laboratory studies we showed that females from this population oviposit a female biassed sex ratio, and that only 14% of females were mated before dispersing from their place of emergence.5. Thus sib-mating is unlikely in this gregarious parasitoid. This outcrossing mating system probably arose because of severe inbreeding depression that B. hebetor suffers via a sex locus: diploids that are heterozygous at the sex locus develop into females, but homozygous diploids are male and are generally inviable. The female biassed sex ratio may have evolved in B. hebetor in response to males being the more expensive sex, females dispersing more frequently from the population than males, or a fraction of females remaining unmated in the population.