松褐天牛的交配行为

采用室内试验和野外观察相结合的方法,对松材线虫病的主要媒介昆虫松褐天牛Monochamus alternatus Hope的交配行为进行了研究。结果表明： 松褐天牛一次完整的交配包括相遇抱对、插入输精和配后保护3个阶段,在交配过程中雄虫有多次插入输精现象发生。室内试验中共观察到松褐天牛的交配123次,松褐天牛一次完整的交配过程平均需时63.49 min,其中输精前的抱对时间平均为1.68 min,交配过程中每次输精插入时间平均为57.60 s,配后保护时间为15.18 min。松褐天牛在开始交配的4天内平均交配5.15次,不同雄性个体所获得的交配机会差异很大。松褐天牛的交配行为表现出强烈的雄性竞争现象,雄虫能根据雌虫或自身的交配经历调整交配投入,当雌虫或者雄虫是初次交配时,总输精时间和插入输精的次数显著大于与有交配经历的雌虫或雄虫交配时的输精时间和插入输精次数。田间松褐天牛的交配行为与室内观察结果基本一致。

Mating behavior of Monochamus alternatus Hope (Coleoptera: Cerambycidae)

Mating behavior of Monochamus alternatus Hope, a major vector of Bursaphelenchuh xylophilus (Steiner & Buhrer) Nickle was observed both in the laboratory and field. The results showed that a complete mating of M. alternatus involved three stagesencountering pair-bonding, ejaculation and post-copulatory guarding. There were many ejaculations in the whole mating process. Of the 123 matings observed in the experiment, the average lasting time for one copulation of M. alternatus was 66.27 min, the time for pair-bonding before ejaculation was 3.51 min with each ejaculation of 57.6 s, and the time of post copulatoryguarding was 15.18 min. M. alternatus made 5.15 matings in four days after the beginning of reproductive stage, and the mating chance by different male individuals were quite different from each other. Mating behavior of M. alternatus presented drastic male competition. Males could adjust their investments of mating according to females and their own mating experience. When a female or male is virgin,  total time of ejaculations is significantly longer than the one which has been mated, and the frequency of ejaculations is significantly greater. Mating behavior of M. alternatus observed in the field was basically consistent with the results observed in the laboratory.