Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China.
Mar Pollut Bull. 2019 Jul;144:11-19. doi: 10.1016/j.marpolbul.2019.05.001. Epub 2019 May 9.
In the present study, environmental parameters and macrozoobenthos in the Yangtze River estuary and its adjacent area, China, were investigated in summer and winter of 2015, and significant seasonal differences were found. Biodiversity was found to be lower in summer, which may result from the higher deposition rate. The relationship between the macrozoobenthic community and environmental parameters (especially dissolved oxygen) was revealed. Linear models describing the response of macrozoobenthic biodiversity indexes to mild oxygen deficiency were constructed. Mild seasonal oxygen deficiency was revealed significantly related to seasonal variations of the macrozoobenthic community, but this deficiency could not damage the community. In contrast, when mild oxygen deficiency occurred, natural predators of macrozoobenthos decreased, which may relieve the survival pressure of macrozoobenthos to some extent. Dissolved oxygen alone could not explain many variations of macrozoobenthos, and other environmental parameters, especially water depth, phosphate concentration and turbidity, also greatly contributed to those variations.
本研究于 2015 年夏、冬两季调查了长江口及其毗邻海域的环境参数和大型底栖动物，结果发现存在显著的季节性差异。夏季的生物多样性较低，这可能是由于较高的沉积速率所致。揭示了大型底栖动物群落与环境参数（特别是溶解氧）之间的关系。构建了描述大型底栖生物多样性指数对轻度缺氧响应的线性模型。结果表明，轻度季节性缺氧与大型底栖动物群落的季节性变化显著相关，但这种缺氧不会破坏群落。相反，当轻度缺氧发生时，大型底栖动物的自然捕食者减少，这在一定程度上减轻了大型底栖动物的生存压力。溶解氧本身并不能解释大型底栖动物的许多变化，其他环境参数，特别是水深、磷酸盐浓度和浊度，也对这些变化有很大的贡献。
