作　　者： ; ; ; ;

机构地区： 华南农业大学资源环境学院昆虫学系

出　　处： 《昆虫学报》 2006年第5期800-804,共5页

摘　　要： 根据膜翅目寄生蜂未受精的卵发育为雄性个体，受精卵发育成雌性个体这一性别决定机制，考察了玉米螟赤眼蜂雄蜂生殖力的大小，探讨了雄蜂授精能力与个体大小、年龄及交配次数之间的关系。结果表明，玉米螟赤眼蜂雄蜂在羽化时或羽化后很短的时间内其精巢就已发育成熟，成虫期不再形成新的精子。雄蜂在羽化后立即可与雌蜂进行交配，在雌蜂过量的情况下，24h内就可能将体内的精子或精液消耗尽，24h后的雄蜂虽能与雌蜂继续交尾，但雌蜂所繁育的子代中未见有雌性个体。同一雄蜂能与多头雌蜂进行交尾，授精8～23头雌蜂，平均能繁育出346．15头雌性后代。雄蜂的授精能力与交配次数密切相关，授精量随交配次数增加而逐渐下降。首次交配时，雄蜂能给雌蜂提供较多的精子，约能繁育出58．85头雌性后代，但随着交配次数的增加，雄蜂向雌蜂输送的精子越来越少，10次交配之后，雄蜂所能授精、繁育的子代雌性数将不超过10头。以后足胫节长度表示个体大小时，体型较大的雄性个体进行多次交配的能力强，能繁育更多的雌性后代。 Based on the sex determination of Hymenoptera parasitic wasps that unfertilized egg develops into a male while fertilized egg develops into a female, the insemination potential of male Trichogramma ostriniae and its relationship with body size, age and the number of copulations were studied. The results showed that spermary of T, ostriniae had been set before the eclosion and no sperm was produced in the adult stage. A male adult could inseminate 8 - 23 females during its lifetime, and approximately breed 346. 15 female progenies. Males exhausted their sperms or seminal fluid in 24 hours after emergence when provided with unlimited virgin females. Though male adults would continue to copulate with females afterwards, no female offspring had been observed. The insemination potential of a male T. ostriniae was closely linked with the number of copulations, and sperm quantity gradually decreased as more copulations performed. The male adult could provide more sperms to females in its initial copulation, and approximately fathered 58.85 female progenies. However, with the increase of the number of copulations and consumption of sperms, fewer and fewer sperms could be transmitted to females. A male could father no more than 10 female progenies after 10 copulations. The insemination potential also showed that it was positively related to body size. Bigger males could copulate more and breed more female progenies.

关 键 词： 玉米螟赤眼蜂 雄性生殖力 个体大小 交配次数 雌性后代

领　　域： [生物学]