Reproductive pattern and population dynamics of aphids having sterile soldier caste.

对冲绳和鹿儿岛两种具有不育兵级的竹蚜（pseudoregma koshunensis）和竹蚜（p.b ambuicola）的不育兵生产模式和种群动态进行了研究。主要研究结果如下：(1)科顺氏斑蝽的贞操雌虫先产正常（拟繁殖）幼虫，后产战士型幼虫。这种模式与其他真社会性昆虫有很大的不同，它们都是先产生工蜂，再产生生殖能力。(2)在鹿儿岛,P.bambucicola个体的数量从8月开始增加,10月达到顶峰,然后下降,在7月成为几乎为零。兵比在10月和11月最高（约20%），3月降至10%，5 - 7月降至近0%。另一方面，在冲绳，从6月开始增加，在7月或8月达到高峰，然后减少。这个数字在12月非常低，在2月和3月几乎为零。士兵比例在秋季最高，但即使在秋季也远低于鹿儿岛（通常低于5%）。(3)鹿儿岛与冲绳岛的种群变化趋势不同可能是由于两地竹林生长季节的差异。(4)与鹿儿岛种群形态差异明显相比，冲绳种群正常型和士兵型幼虫形态差异不明显。这一事实和士兵比例的差异表明两个菌株之间存在一定的遗传差异。

Pattern of production of sterile soldiers and population dynamics of two species of bamboo aphids, pseudoregma koshunensis and P.bambucicola, having sterile soldier caste, were studied in Okinawa and Kagoshima. Major results are as follows :(1) Virginoparous females of P.koshunensis first laid normal (to-be-reproductive) larvae and secondly soldier-type larvae. This pattern is quite different from other eusocial insects, all of which produce workers first and to-be-reproductives secondly. (2) In Kagoshima, the number of P.bambucicola individuals began to increase from August, reached its peak in October, then decreased and became nearly zero in July. The soldier ratio was highest in October and November (ca. 20%) and decreased to 10% in March and nearly 0% during period from May to July. On the other hand, in Okinawa, the number began to increase from June, reached the peak at July or August, then decreased. The number was very low in December and became nearly zero during February and March. The soldier ratio was highest in autumn but even in autumn it was far lower than Kagoshima (usually less than 5%). (3) A reason of different population trends between Kagoshima and Okinawa might be difference of badding season of bamboos in the two areas. (4) In Okinawan populations morphological difference between normal and soldier type larvae was not clear as compared with clear difference in Kagoshima. This fact and difference in soldier ratio suggested existence of some genetic differences between the two strains.