Life History of Milnesium tardigradum Doyère (Tardigrada) under a Rearing Environment
Life History of Milnesium tardigradum Doyère (Tardigrada) under a Rearing Environment
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Milnesium tardigradum Doyère (Tardigrada) 在饲养环境下的生活史
DOI：
10.2108/zsj.20.49
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
A. Suzuki
中科院分区：
文献类型：
--
作者：
A. Suzuki
摘要在25 ° C的琼脂平板上，以水为培养介质，培养了一株缓步缓步类动物Milnesium tardigradum。以单殖体无刺蜡蚧轮虫为食物源。这种饲养系统允许详细观察缓步动物的行为。每天测量体长允许的增长速度和蜕皮周期的这个物种被确定。对M.在这些条件下饲养的缓步动物包括多达七个换羽期。第一次和第二次蜕皮间隔4-5 d，个体在3龄时达到生殖成熟，第一次产卵期伴随第三次蜕皮。研究种群中发育最快的动物在孵化后12天产卵。成年动物的产卵间隔或换羽间隔约为6 - 10天。平均窝卵数为6.9枚。在这个实验室种群中的所有缓步动物都是雌性，并通过孤雌生殖繁殖。胚胎期为5 - 16天。最长寿的雌性在孵化后存活了58天，并在5个单独的窝中总共产下41枚卵。记录并拍摄了在这些条件下饲养的缓步动物的整个生命周期。本文简要描述了M.还报告了tardigradum。
Abstract A strain of carnivorous tardigrade, Milnesium tardigradum, was reared in water on agar plates at 25°C. The monogonont rotifer Lecane inermis was presented as a food source. This rearing system permitted detailed observation of tardigrade behaviour. Daily measurements of body length allowed the growth rate and moulting cycle of this species to be determined. The life history of M. tardigradum raised under these conditions included up to seven periods of moult. The first and second moults occurred at intervals of 4–5 days, and individuals reached reproductive maturity at the 3rd-instar stage; the first period of egg laying accompanied the third moult. The most rapidly developing animal in the study population laid eggs 12 days after hatching. The egg-laying intervals or moulting intervals of adult animals were around 6-10 days. The mean clutch size was 6.9 eggs. All tardigrades in this laboratory population were female and reproduced by parthenogenesis. The duration of the embryonic stage ranged from 5–16 days. The most long-lived female survived for 58 days after hatching, and laid a total of 41 eggs in 5 separate clutches. The entire life cycle of tardigrades reared under these conditions was recorded and photographed. A brief description of the embryonic development of M. tardigradum was also reported.