Effects of reproductive interference on the competitive displacement between two invasive whiteflies
Effects of reproductive interference on the competitive displacement between two invasive whiteflies
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生殖干扰对两种入侵粉虱竞争性位移的影响
DOI：
10.1017/s0007485314000108
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发表时间：
2014-02
影响因子：
1.9
通讯作者：
Liu, Shu-Sheng
中科院分区：
文献类型：
--
作者：
Li, Jie;Liu, Yin-Quan;Crowder, David W.;Liu, Shu-Sheng
生殖干扰是昆虫间物种排斥的主要因素之一。烟粉虱复合体的隐蔽种中东-小亚细亚1号（MEAM1）和地中海型（MED）已入侵世界许多地区，并经常出现生态位重叠和繁殖干扰。然而，在美国和中国等地区，已经观察到两种入侵者之间竞争性位移的对比模式。了解生殖干扰在不同地区两个物种种群间竞争性相互作用中的作用，将有助于揭示与它们入侵有关的其他因素。本研究采用室内种群实验、行为观察和模拟建模相结合的方法，探讨了生殖干扰对中国MEAM1和MED之间物种排斥的影响。在两个物种的混合队列中，当MEAM1的初始比例大于或等于0.25时，MEAM1总是在几代中排除MED。然而，即使MEAM1的初始比例仅为0.10，MEAM1排除MED的概率仍然高于MED排除MEAM1的概率。重要的是，我们发现随着MEAM1相对丰度的增加，MED人群越来越偏向于男性。详细的行为观察证实，MEAM1表现出比MED更强的生殖干扰，导致MED的交配频率和雌性后代的产生减少。通过模拟模型，我们将行为观察与排除实验联系起来，表明种间不对称生殖干扰预测了MEAM1对MED的物种排除率。这些发现不仅揭示了繁殖干扰在两种入侵白蝇竞争相互作用中的重要性以及详细的行为机制，而且为探索其他因素介导物种排斥的影响提供了有价值的框架。
Abstract Reproductive interference is one of the major factors mediating species exclusion among insects. The cryptic species Middle East-Asia Minor 1 (MEAM1) and Mediterranean (MED) of the whitefly Bemisia tabaci complex have invaded many parts of the world and often exhibit niche overlap and reproductive interference. However, contrasting patterns of competitive displacement between the two invaders have been observed between regions such as those in USA and China. Understanding the roles of reproductive interference in competitive interactions between populations of the two species in different regions will help unravel other factors related to their invasion. We integrated laboratory population experiments, behavioural observations and simulation modelling to investigate the role of reproductive interference on species exclusion between MEAM1 and MED in China. In mixed cohorts of the two species MEAM1 always excluded MED in a few generations when the initial proportion of MEAM1 was ⩾0.25. Even when the initial proportion of MEAM1 was only 0.10, however, MEAM1 still had a higher probability of excluding MED than that for MED to exclude MEAM1. Importantly, we show that as MEAM1 increased in relative abundance, MED populations became increasingly male-biased. Detailed behavioural observations confirmed that MEAM1 showed a stronger reproductive interference than MED, leading to reduced frequency of copulation and female progeny production in MED. Using simulation modelling, we linked our behavioural observations with exclusion experiments to show that interspecific asymmetric reproductive interference predicts the rate of species exclusion of MED by MEAM1. These findings not only reveal the importance of reproductive interference in the competitive interactions between the two invasive whiteflies as well as the detailed behavioural mechanisms, but also provide a valuable framework against which the effects of other factors mediating species exclusion can be explored.
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影响因子：
3.3
作者：
J. Luan;Shu-Sheng Liu
通讯作者：
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影响因子：
4.1
作者：
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通讯作者：
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影响因子：
2.2
作者：
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通讯作者：
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作者：
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通讯作者：
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影响因子：
4.8
作者：
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通讯作者：
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