The annual Diel Vertical Migration (DVM) patterns of Zooplankton in Jiaozhou Bay were studied in four seasons during 2006 and 2007. The station was situated at 36°5'54"N, 120°15'20"E, and samples were collected diel-continuously during 24 h in one day. The results showed that zooplankton acted differently during four seasons. In spring, they swam downward at noon and midnight, i. e. they acted as double cycles of rising and sinking, while in summer, zooplankton showed with the spring oppasite. In autumn, the center of density had a broader range than any other season, zooplankton seemed to stay at the upper layer at daylight, and to sink at night. In winter, zooplankton showed weaker DVM behavior, and the law was with the spring opposite. We studied the DVM characteristics of dominant species in Jiaozhou Bay and classified them into different groups as well. It was found that the ways and the time of the DVM for different species were different in the same season. As for the same species, they usually changed with seasons. As a result, for zooplankton, the DVM was always changing, it was determined not only by exogenous stressors but also by endogenous rhythms. And the key factors which contributed were not the same in four seasons. Sunlight was one of the key factors for all seasons. Besides, In winter, temperature, salinity and phytoplankton were also important. In total, zooplankton showed positive relationships with temperature and phytoplankton, and a negative relationship with salinity. Moreover,for specific species, the key factors which were responsible for the pattern of DVM were different.%在胶州湾内设置连续站(36°5 ′54″N,120°15′20″E),分别于2006- 2007年分春季、夏季、秋季、冬季四季进行垂直分段拖网,研究了胶州湾浮游动物垂直移动的规律.结果显示,浮游动物在不同季节显示不同的垂直迁移行为.同时,对该海域出现的优势种类的垂直移动规律进行了研究并分类,发现不同物种同一季节迁移方式不同,对于同一种类,在不同季节也表现出不同的迁移规律.因此,浮游动物垂直迁移规律不是一成不变的,由外界环境因子和内在因素共同作用决定.不同季节影响浮游动物垂直迁移的关键因子不同,其中春季、夏季、秋季三季主要影响因子是光照,冬季除了光照,还有温度、盐度和浮游植物密度.总体与温度和浮游植物密度正相关,与盐度负相关.对于不同种类,影响其垂直迁移的主要因子也不尽相同.
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