Combined effects of food supply and temperature on asexual reproduction and somatic growth of polyps of the common jellyfish Aurelia aurita s.l.
Combined effects of food supply and temperature on asexual reproduction and somatic growth of polyps of the common jellyfish Aurelia aurita s.l.
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DOI：
10.3800/pbr.5.98
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发表时间：
2010-08
影响因子：
0.6
通讯作者：
Chang-hoon Han;S. Uye
中科院分区：
文献类型：
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作者：
Chang-hoon Han;S. Uye
息肉期是奥雷利亚耳的重要组成部分。生活周期，因为水螅克隆体能够通过出芽增加其种群大小，从而提供了通过横裂产生许多水螅来增加水母种群的机会。研究了A.在实验室中，在4种不同的温度（即18、22、26和28 ° C）和5种不同的食物水平（即1.7、3.3、6.6、10和13.3毫克C息肉）下，以个体为基础，对耳息肉进行测试。无性繁殖的三种类型被观察到：息肉直接芽从父母柄（DBP），息肉芽从父母足匍匐茎（SBP），和podocysts（PC）。DBP是主要的再生方式（占94%），SBP和PC分别仅占5%和1%。在低食物供应（-3.3毫克C息肉-1天-1）和高温（-26 °C）下，息肉产生PC。随着食物和温度的增加，DBP和SBP产生的新息肉显著增加。母体水螅的体细胞生长随食物的增加和温度的降低而显著增加。我们的结论是，全球变暖导致的水温升高和富营养化导致的浮游动物捕食丰度增加可能是导致A.近年来在东亚沿海沃茨发现了一种水母。
The polyp stage is an important part of the Aurelia aurita s.l. life cycle, because polyp clones are able to increase their population size by budding, providing the opportunity to increase the medusa population by the produc- tion of many ephyrae through strobilation. We investigated asexual reproduction of A. aurita polyps on an individual basis at 4 different temperatures (i.e. 18, 22, 26 and 28 o C) and at 5 different food levels (i.e. 1.7, 3.3, 6.6, 10 and 13.3 mg C polyp �1 d �1 ) in the laboratory. Three types of asexual reproduction were observed: polyps directly budded from the parent stalk (DBP), polyps budded from the parent pedal stolon (SBP), and podocysts (PC). DBP was the major repro- ductive method (94% of the total) and SBP and PC accounted for only 5 and 1%, respectively. PC were produced by the polyps kept under low food supply (�3.3 mg C polyp �1 d �1 ) and high temperature (�26°C). Production of new polyps by DBP and SBP significantly increased with increasing food and temperature. The somatic growth of parent polyps significantly increased with more food and cooler temperatures. We conclude that both increases in water temperature through global warming and increases in abundances of zooplankton prey because of eutrophication may be responsible for the prominent blooms of A. aurita medusae in East Asian coastal waters in recent times.