中文摘要：

我们使用了长期的监视数据在丰富和种类优势评估变化小海蜇(与其钟直径是不到 5 厘米的浮游动物网镇定) 在 1991 和 2009 之间在 Jiaozhou 海湾，中国。浮游动物样品垂直地与圆锥形的浮游生物网被拖引从对表面近底部，识别用显微镜，并且用 Grapher 7.0 和遨游者在时间空间印射 8.0。结果证明在整个海湾小海蜇的许多 15.2 ind./m3 平均在 20012009 期间一直在增加，比那高几乎 5 倍在 1991 和 2000 之间。在分别地， 2000，和二座山峰在 2005 以后出现在春天和夏天以后，山峰丰富的出现从春天变了到夏天。丰富和花蕾的频率小海蜇在海湾在 2000 以后增加了。另外，海蜇的生物多样性在主导的种类与一个变化在最近的年里显著地增加了。几新主导的种出现在 2000 以后，包括 Rathkae 在冬季，在春天的 Phialidium hemisphaericum ，夏天，和秋天和秋天的 octopunctata 在整个1990年代的某以前的主导的种类( Eirene ceylonensis ， Zanclea costata ， Lovenella assimilis ，并且 Muggiaea atlantica )在 2000 以后不再是主导的。许多小海蜇断然与 dinoflagellates，和许多浮游动物的密度被相关。我们相信在 smalljellyfish 丰富和种类作文的变化在海湾附近是超营养作用，水产业和沿海的构造活动的结果。并发地，温暖的海水和在最近的十年的咸度减少支持了生长和繁殖在海湾小海蜇。

英文摘要：

We used long term monitoring data to evaluate changes in abundance and species dominance of small-jellyfish （collected with zooplankton net whose bell diameter was less than 5 cm） between 1991 and 2009 in the Jiaozhou Bay, China. Zooplankton samples were vertically towed with conical plankton net from near-bottom to surface, identified microscopically, and mapped in time-space using Grapher 7.0 and Surfer 8.0. Results show that the abundance of small-jellyfish throughout the bay had been increasing during 2001-2009 on average of 15.2 ind./m^3, almost 5 times higher than that between 1991 and 2000. The occurrence of peak abundance shifted from spring to summer after 2000, and two peaks appeared in spring and summer, respectively, after 2005. Both the abundance and the frequency of blooms of small-jellyfish increased after 2000 in the bay. In addition, the biodiversity of jellyfish has increased significantly in recent years with a change in dominant species. Several new dominant species appeared after 2000, including Rathkae octopunctata in winter, Phialidium hemisphaericum in spring, summer, and autumn, Phialucium carolinae in spring, and Pleurobrachia globosa in summer and autumn, while some previous dominant species throughout the 1990s （Eirene ceylonensis, Zanclea costata, Lovenella assimilis, and Muggiaea atlantica） were no longer dominant after 2000. The abundance of small-jellyfish was positively correlated with the density of dinoflagellates, and the abundance of zooplankton. We believe that the changes in small- jellyfish abundance and species composition were the result of eutrophication, aquaculture and coastal construction activities around the bay. Concurrently, seawater warming and salinity decrease in recent decades promoted the growth and reproduction of small-jellyfish in the bay.