Differences in mating behavior lead to asymmetric mating interactions and consequential changes in sex ratio between an invasive and an indigenous whitefly.
Differences in mating behavior lead to asymmetric mating interactions and consequential changes in sex ratio between an invasive and an indigenous whitefly.
复制标题
DOI：
10.1111/j.1749-4877.2011.00273.x
复制
发表时间：
2012-03
影响因子：
3.3
通讯作者：
J. Luan;Shu-Sheng Liu
中科院分区：
文献类型：
--
作者：
J. Luan;Shu-Sheng Liu
烟粉虱复合体中国中入侵的B粉虱和本土的ZHJ2粉虱是两个以前异地隔离的隐种。实验室实验表明，入侵的B可以取代本土的ZHJ2。在这里，我们观察了B和ZHJ2的交配行为和交配相互作用，以阐明它们竞争的行为机制。这两个物种能够相互交配，尽管交配的频率明显低于同一物种中雄性和雌性之间的交配频率。异种交配的雌性只产生雄性后代，表明生殖隔离。异种交配对雌虫生殖的影响都很小。对两种交配交互作用的详细观察表明，B比ZHJ2有更高的性行为。B雄鼠比ZHJ2雄鼠更有可能打断竞争对手发起的求爱。与ZHJ2雄蜂相比，B雄蜂比同种异种雄蜂更有可能成功地打断竞争对手异种雄蜂发起的求偶。此外，B雄蜂在交配后保护B雌蜂，而ZHJ2雄蜂则不这样做。当这两个物种共存时，它们之间的行为差异和相互作用导致B的后代产生雌性的比例增加，而ZHJ2的后代产生的雌性的比例降低。这些不对称的交配相互作用可能是导致ZHJ2被B取代的一个重要机制。我们的研究表明，生殖干扰可能有助于在生物入侵过程中密切相关物种之间的竞争排斥。
The invasive B whitefly and the indigenous ZHJ2 whitefly in China of the Bemisia tabaci complex represent two previously allopatric cryptic species. Laboratory experiments have shown that the invasive B can displace the indigenous ZHJ2. Here, we observed the mating behavior and mating interactions between B and ZHJ2 to elucidate the behavioral mechanisms underlying their competition. The 2 species are able to mate with each other, although at a significantly lower frequency than that between males and females within the same species. Heterospecifically-mated females produce only male progeny, indicating reproductive isolation. Heterospecific mating had only a marginal effect on reproduction of females in either species. Detailed observations on mating interactions between the 2 species showed that B had higher sexual activity than ZHJ2. B males were more likely to interrupt courtships initiated by rival males than ZHJ2 males. Compared with ZHJ2 males, B males were also more likely to successfully interrupt courtships initiated by rival heterospecific males than by males of the same species. In addition, B males guarded B females post-copulation, whereas ZHJ2 males did not. When the 2 species co-occurred, the behavioral differences and interactions between them resulted in an increased proportion of females produced in the offspring of B but reduced proportion of females in the progeny of ZHJ2. These asymmetric mating interactions might be an important mechanism underlying the displacement of ZHJ2 by B. Our study shows that reproductive interference might contribute to the competitive exclusion between closely related species during biological invasions.