2009年2—12月间在胶州湾大沽河口邻近海域的逐月现场调查中，利用垂直拖网研究了海月水母碟状体和水母体的时空分布情况以及对其它浮游动物类群的影响，并探讨了海月水母的生态适应性。结果表明：海月水母的碟状体4月份开始在胶州湾出现，并且丰度逐渐增加，到6月份达到最高峰。海月水母的水母体集中在7月份大量出现。碟状体和水母体高峰期的月平均丰度分别为2．9和1．3ind／m2。碟状体开始出现时的水温平均为11．5℃，数量高峰期的水温为20．6℃，而水母体高峰期的水温为25．2℃。该海域的浮游动物总丰度（不含夜光虫）在5—7月份有个高峰期，其中5月份最高值为486．9ind／m2。7月份海月水母高峰期，浮游动物的丰度没有明显下降，两者丰度的地理变化之间也没有显著的相关性。但是通过对2006--2010年间的浮游动物各类群丰度对比，2009年海月水母暴发时夜光虫和桡足类春季丰度高值显著低于其它年份。%During February--December, 2009, monthly investigations were carried out in north-western part of the Jiaozhou Bay. Abundances of the moon jellyfish Aurelia aurita and other zooplankton groups were investigated with ver- tical net towing. Ecological adaption and impacts on other zooplankton groups of moon jellyfish were analysed, and com- pared with synchronous zooplankton and environmental data. Ephyra ofA. aurita was observed from April to June, when its abundance increased from 0.1 to 2.9ind/m3. Medusa ofA. aurita was captured only in July with an average abundance of 1.3ind/m3. The average water temperatures were 11.5 ~C at occurrence of ephyra and 20.6 and 25.2~C during abundance peak of ephyra and medusae, respectively. Total zooplankton abundance （without A. aurita and Noctiluca seintillans） was high from May to July, with the highest of 486.9ind/m3 being observed in May. In July, no significant decrease was ob- served in total zooplankton abundance, and its geographical variation showed no significant correlation with that of A. aurita. However, through re-analysis of historic data during 2006--2010 in the similar area, it was revealed that annual peak abundances of N. seintillans, copepods and meroplankton were much lower in A. aurita bloom years than in non-bloom years, while no difference was observed in abundances of chaetognaths and small Jellyfish.
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