西花蓟马与豆大蓟马成虫数量和性别对彼此产卵量的影响

为明确西花蓟马Frankliniella occidentalis和豆大蓟马Megalurothrips usitatu共存时的生殖竞争,采用叶盘法测定了孤雌生殖方式下和两性生殖方式下,接入不同数量西花蓟马雌、雄成虫后,豆大蓟马日产卵量和总产卵量;接入不同数量豆大蓟马雌、雄成虫后,西花蓟马的日产卵量和总产卵量,明确了2种蓟马成虫数量和性别对彼此日产卵量和总产卵量的影响。在豆大蓟马孤雌生殖方式下,1头西花蓟马雌成虫即可使其日产卵量和总产卵量显著降低,由8.8粒和61.6粒分别下降至7.5粒和52.4粒,而1头西花蓟马雄成虫对其产卵量无显著影响;在豆大蓟马两性生殖方式下,1头西花蓟马雌成虫同样可显著降低其日产卵量和总产卵量,由6.6粒和46.2粒分别下降至5.2粒和36.6粒,1头西花蓟马雄成虫也可显著降低其产卵量,分别下降至5.9粒和41.4粒;西花蓟马雌成虫对2种生殖方式下豆大蓟马产卵量的影响均显著或极显著大于雄成虫。在西花蓟马孤雌生殖方式下,1头豆大蓟马雌成虫和雄成虫即可显著降低其产卵量,日产卵量由6.8粒均下降至6.1粒,总产卵量由47.4粒分别下降至43.0粒和42.6粒;在西花...

Effects of the number and sex of Frankliniella occidentalis and Megalurothrips usitatus adults on their fecundity

To explore the reproductive competition between Frankliniella occidentalis and Megaluro-thrips usitatus by mixing different numbers of female and male adults of the two thrips, the changes of their fecundity interfered by each other were studied under both parthenogenesis and bisexual reproduc-tion using leaf disc test. The daily and total fecundity of M. usitatus under parthenogenesis significantly decreased under the interference of one female adult of F. occidentalis from 8.8 eggs and 61.6 eggs to 7.5 eggs and 52.4 eggs, respectively. However, adding one male adult of F. occidentalis had no influ-ence on the fecundity of M. usitatus under parthenogenesis. The daily and total fecundity of M. usitatus under bisexual reproduction significantly decreased under the interference of one female adult of F. occi-dentalis from 6.6 eggs and 46.2 eggs to 5.2 eggs and 36.6 eggs, respectively. The fecundity of M. usita-tus under bisexual reproduction also significantly decreased under the interference of one male adult of F. occidentalis from 6.6 eggs and 46.2 eggs to 5.9 eggs and 41.4 eggs, respectively. The female adults of F. occidentalis had a stronger inhibitive effect on the fecundity of M. usitatus than male adults under the two reproductive modes. The fecundity of F. occidentalis under parthenogenesis significantly decreased under the interference of one female or male adult of M. usitatus. The daily fecundity decreased from 6.8 eggs to 6.1 eggs and 6.1 eggs, respectively. The total fecundity decreased from 47.4 eggs to 43.0 eggs and 42.6 eggs, respectively. The daily and total fecundity of F. occidentalis under bisexual repro-duction also significantly decreased under the interference of one female adult of M. usitatus from 6.1 eggs and 43.0 eggs to 4.3 eggs and 30.0 eggs, respectively. However, the fecundity of F. occidentalis un-der bisexual reproduction was not significantly decreased before two male adults of M. usitatus were added. The female adults of M. usitatus had a stronger inhibitive effect on the fecundity of F. occidenta-lis than male adults under the two reproductive modes. The daily and total fecundity of M. usitatus un-der the two reproductive modes were higher than those of F. occidentalis, no matter whether the interfer-ence existed or not. The results indicated that M. usitatus had a dominant position in the reproductive competition with F. occidentalis due to its higher fecundity.