State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, P. R. China.
PLoS One. 2013 Nov 28;8(11):e82003. doi: 10.1371/journal.pone.0082003. eCollection 2013.
Understanding the dynamics of potential inter- and intraspecific competition in parasitoid communities is crucial in the screening of efficient parasitoid species and for utilization of the best parasitoid species combinations. In this respect, the host-parasitoid systems, Bemisia tabaci and two parasitoids, Eretmocerus hayati (exotic) and Encarsia sophia (existing) were studied under laboratory conditions to investigate whether interference competition between the exotic and existing species occurs as well as the influence of potential interference competition on the suppression of the host B. tabaci. Studies on interspecific-, intraspecific- and self-interference competition in two parasitoid species were conducted under both rich and limited host resource conditions. Results showed that (1) both parasitoid species negatively affect the progeny production of the other under both rich and limited host resource conditions; (2) both parasitoid species interfered intraspecifically on conspecific parasitized hosts when the available hosts are scarce and; 3) the mortality of B. tabaci induced by parasitoids via parasitism, host-feeding or both parasitism and host-feeding together varied among treatments under different host resource conditions, but showed promise for optimizing control strategies. As a result of our current findings, we suggest a need to investigate the interactions between the two parasitoids on continuous generations.
了解寄生性生物群落中潜在的种间和种内竞争的动态，对于筛选有效的寄生性生物物种以及利用最佳的寄生性生物物种组合至关重要。在这方面，本研究在实验室条件下研究了烟粉虱及其两种寄生性生物，即异色足腹小蜂（外来种）和斯氏寡节小蜂（现有种），以调查外来种和现有种之间是否存在干扰竞争，以及潜在的干扰竞争对宿主烟粉虱的抑制作用的影响。在丰富和有限的宿主资源条件下，对两种寄生性生物的种间、种内和自干扰竞争进行了研究。结果表明：（1）在丰富和有限的宿主资源条件下，两种寄生性生物都会对另一种寄生性生物的后代产生负面影响；（2）当可用宿主稀缺时，两种寄生性生物都会对同种被寄生的宿主产生种内干扰；（3）在不同的宿主资源条件下，寄生性生物通过寄生、取食宿主或两者兼而有之对烟粉虱的死亡率因处理方式而异，但为优化控制策略提供了希望。基于我们目前的研究结果，我们建议有必要对两种寄生性生物在连续几代中的相互作用进行研究。
