David Jean-François, Coulis Mathieu
Centre d'Ecologie Fonctionnelle & Evolutive, UMR 5175, CNRS-Université de Montpellier, 1919 route de Mende, F-34170 Montpellier cedex 5, France.
Zookeys. 2015 Jun 30(510):115-24. doi: 10.3897/zookeys.510.8838. eCollection 2015.
Growth, development and life-cycle duration of the millipede Ommatoiulussabulosus (f.aimatopodus) were studied in a Mediterranean shrubland of southern France and compared with previous data from northwest Europe. Changes in the proportions of stadia during the course of the year were analysed in several generations. The results show that stadia VII and VIII are consistently reached after the first year of growth, and stadia IX and X after the second year. First reproduction may occur at the age of two years in males reaching maturity at stadium X, but not until the age of three in those reaching maturity at stadia XI and XII. Reproduction cannot occur until at least the age of three in females, which carry mature eggs from stadium XI onwards. In comparison with more northern populations, life-cycle duration is not shorter in the Mediterranean population but there are marked differences in its phenology: the breeding period is in autumn, so that juveniles of stadia II to VI are never faced with the summer drought, and larger individuals are mostly inactive in summer; moreover, all individuals moult once every winter. The results illustrate how julid millipedes of humid temperate regions could respond to higher temperatures and drier summer conditions in the context of climate change.
在法国南部的一片地中海灌木丛中，对千足虫Ommatoiulussabulosus（f.aimatopodus）的生长、发育和生命周期持续时间进行了研究，并与西北欧的先前数据进行了比较。对几代千足虫在一年中各龄期比例的变化进行了分析。结果表明，在生长的第一年之后， consistently会达到VII龄和VIII龄，在第二年之后会达到IX龄和X龄。在X龄达到成熟的雄性千足虫可能在两岁时首次繁殖，但在XI龄和XII龄达到成熟的雄性千足虫直到三岁才会繁殖。雌性千足虫至少要到三岁才会繁殖，从XI龄开始携带成熟的卵。与更靠北的种群相比，地中海种群的生命周期持续时间并不短，但其物候学有明显差异：繁殖期在秋季，因此II龄至VI龄的幼体永远不会面临夏季干旱，较大的个体在夏季大多不活动；此外，所有个体每年冬天都会蜕皮一次。研究结果说明了湿润温带地区的朱利德千足虫在气候变化的背景下如何应对更高的温度和更干燥的夏季条件。
