The production of subitaneous and diapause eggs : a reproductive strategy for Acartia bifilosa (Copepoda : Calanoida) in Southampton Water, UK
The production of subitaneous and diapause eggs : a reproductive strategy for Acartia bifilosa (Copepoda : Calanoida) in Southampton Water, UK
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亚卵和滞育卵的生产：英国南安普敦水域的 Acaria bifilosa（Copepoda：Calanoida）的繁殖策略
DOI：
10.1093/plankt/21.1.65
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发表时间：
1999
影响因子：
2.1
通讯作者：
John A. Williams
中科院分区：
文献类型：
--
作者：
E. Castro;John A. Williams
来自南安普敦水域的阿卡蒂亚·比比罗萨产下了两种形态截然不同的卵，这是第一次被描述。表面光滑的蛋被认为是皮下的，而覆盖着厚厚的“刺”的蛋是滞育的。在南安普敦水域双纹夜蛾的季节性发生期间，从11月/12月到6月，在这一时期的头几个月产卵。滞育卵的生产被限制在两个月后才能从水柱中出现。在季节性野外温度(5-12摄氏度)下产生的卵的反应与报道的其他螨种的反应有显著差异。具体地说，皮下卵和滞育卵的雌卵数量较少，一般为4；皮下卵的孵化时间较长，最适温度为15℃至20℃，最适盐度为20PSU，孵化时间长达10天。适应较高实验室温度条件的雌性在田间盐度下产卵率较高。还报道了一只延迟孵化的皮下卵。结果表明，来自南安普敦水域的双管藻的繁殖力可能在一定程度上受到温度的限制，产生的卵的反应似乎提供了双管藻的繁殖能力，以确保它在这个受季节影响的环境中持续存在。
Acartia bifilosafrom Southampton Water lays two morphologically distinct types of egg which are described for the first time. Eggs with a smooth surface are considered subitaneous, while eggs covered with thick 'spines' are diapause. During the seasonal occurrence ofA.bifilosain Southampton Water, from November/December to June, subitaneous eggs are laid during the first months of this period. The production of diapause eggs is restricted to a 2 month period beforeA.bifilosadisappears from the water column. There are significant differences between the response of the eggs produced at seasonal field temperatures (5-12C) and those reported for otherAcartiaspecies. In particular, the numbers of eggs female-1day-1, both subitaneous and diapause, are lower and typically <4; and the hatching time of subitaneous eggs is longer, at up to 10 days, at optimum temperatures between 15 and 20°C and optimum salinity >20 PSU. Females acclimated to higher laboratory temperature regimes show higher egg production rates at field salinity. A delayed-hatch subitaneous egg is also reported. Results suggest that fecundity inA.bifilosafrom Southampton Water might be limited to some degree by temperature and the responses of the eggs produced appear to offerA.bifilosaa reproductive repertoire to ensure its sustained presence in this seasonally influenced environment.