中文摘要：

根据“973”项目2000年10月-2007年8月浮游生物大网样品，对黄海小型水母类的种类组成及其丰度的时空变化进行了研究，讨论了各优势水母种类在黄海的分布格局。结果表明，黄海测区内小型水母整体丰度较低，且主要分布在50m等深线以浅海域，各小型水母类群如水螅水母类，管水母类和栉水母类以及10种优势种类的季节更替非常明显。与其它海域相比，黄海小型水母丰度水平最低，平均为0．8ind／m3，占整个浮游动物丰度的比例小于0．5％，因此从丰度上看，小型水母在黄海浮游动物功能群中并不占优势。

英文摘要：

Seasonal variation, species compositions and abundances of small medusae in the Yellow Sea were studied on the basis of samples collected vertically by zooplankton net from October 2000 to August 2007. The results showed that total abundances of small medusae were generally low in the Yellow Sea area, and they mainly distributed in the water shallower than 50m. Seasonal replacements of medusae classes such as hydromedusae, siphonophores and ctenophores, and ten dominant taxa were extremely apparent. Comparing abundance levels and percentages of small medusae occupied total zooplankton abundance among several sea areas, we found that the abundances [0.8 （0.04--1.3） ind/m3] and percent- ages （〈0.5%） of small medusae in the Yellow Sea were all lowest, which indicated that small medusae were not dominant assemblage among zooplankton functional groups. Combined the status in the Bohai Sea and the East China Sea, the dis- tributional pattern of dominant species in the Yellow Sea were discussed.