Yoshiga Toyoshi, Ishikawa Yuji, Tanaka Ryusei, Hironaka Mantaro, Okumura Etsuko
Department of Applied Biological Sciences, Saga University, Saga, 840-8502, Japan.
Naturwissenschaften. 2013 Feb;100(2):205-8. doi: 10.1007/s00114-013-1011-z. Epub 2013 Jan 17.
Caenorhabditis japonica is a bacteriophagous nematode species that was discovered on the semi-social burrower bug, Parastrachia japonensis, which demonstrates egg-guarding and provisioning behaviors. To understand the life history of C. japonica in relation to P. japonensis, we demonstrated the specificity of this association and fluctuations in nematode number on the insect throughout the year. C. japonica dauer larvae (DL), larvae in a nonfeeding diapause stage, were predominantly found as clumps on the adult female insects but rarely found on the male insects in all populations examined. This female-biased association was consistent throughout the year, but after the nymphs hatched, nematodes were not detected on the mother insects showing provisioning behavior. DL appeared on the nymphs, and the number of DL on the newly emerged female insects gradually increased thereafter. C. japonica has never been detected on other invertebrates collected from the P. japonensis habitat thus far. Our data suggest that the life cycles of C. japonica and P. japonensis are synchronized.
日本秀丽隐杆线虫是一种噬菌性线虫物种，它是在半社会性穴居蝽日本副喙蝽上被发现的，日本副喙蝽表现出护卵和育幼行为。为了了解日本秀丽隐杆线虫与日本副喙蝽相关的生活史，我们证明了这种关联的特异性以及全年昆虫上线虫数量的波动。日本秀丽隐杆线虫的 dauer 幼虫（DL），即处于不取食滞育阶段的幼虫，在所有被检查的种群中，主要以团块形式存在于成年雌性昆虫上，但在雄性昆虫上很少发现。这种偏向雌性的关联全年一致，但若虫孵化后，在表现出育幼行为的母虫上未检测到线虫。DL 出现在若虫上，此后新出现的雌性昆虫上的 DL 数量逐渐增加。迄今为止，在从日本副喙蝽栖息地采集的其他无脊椎动物上从未检测到日本秀丽隐杆线虫。我们的数据表明，日本秀丽隐杆线虫和日本副喙蝽的生命周期是同步的。
