Long-term changes of nutrients, plankton and macrobenthos were studied to research the transformation of ecosystem in Jiaozhou Bay and Daya Bay in the past 30 years. Concentrations of dissolved inorganic nitrogen and phosphate increased with significant changes in nutrient compositions and ratios. Concentrations of Chl a slightly decreased in Jiaozhou Bay but increased in Daya Bay. Phytoplankton abundances increased and diatoms were dominant, however, dinoflagellate gradually had the competitive advantage under high N/P and N/Si in the two bays. Zooplankton biomass significantly increased in Jiaozhou Bay, but only increased slightly in Daya Bay over the past years. Polychaetes were dominant in macrobenthos in the bays, indicating their adaptation to the changing benthic environments. The long-time variations of biocenoses and nutrients reflected that the ecological environments have changed under the influence of anthropogenic activities in the two bays.

研究了近30年来养分，浮游生物和大型底栖动物的长期变化，研究了胶州湾和大亚湾生态系统的变化。随着营养成分和比例的显着变化，溶解的无机氮和磷酸盐的浓度增加。叶绿素的浓度一胶州湾略有下降，但大亚湾则有所增加。浮游植物的丰度增加且硅藻占主导地位，但是，在两个海湾高氮磷和氮硅条件下，鞭毛藻逐渐具有竞争优势。在过去的几年中，胶州湾的浮游动物生物量显着增加，但在大亚湾仅略有增加。在海湾的大型底栖动物中，多毛类占主导地位，表明它们适应了不断变化的底栖环境。生物酶和养分的长期变化反映出，在两个海湾的人为活动的影响下，生态环境发生了变化。