This study investigates the relationship between macrobenthic functional group composition and hypoxia in the Changjiang River estuary and its adjacent sea areas. A total of 82 stations were divided into three areas, named non-hypoxic area, hypoxic area and the Changjiang River, respectively. A total of 256 macrobenthic species were collected, which were divided into five functional groups, including carnivorous, detritivorous, omnivorous, phytophagous, and the planktivorous functional group. A similarity analysis performed on the macrobenthic functional groups of the three zones indicates that the functional group distributions of non-hypoxic and hypoxic zones are not significantly different, whereas the functional group compositions of the Changjiang River estuary and the other two zones are rather different. The results of canonical correspondence analysis reveal that the distribution of macrobenthic functional groups is compounded by various environmental factors, of which dissolved inorganic nitrogen, salinity, and temperature exert a significant effect. Combining the results of previous studies, we speculate that macrobenthos are able to adapt to the occurrence of hypoxia by changing their body morphology, distribution location, and community structure. When the environmental conditions prevent the hypoxia from occurring, persisitent hypoxic zones can recover their marine microbenthic community.

中文翻译：

---

长江口及邻区大型底栖动物功能群组成与缺氧关系

本研究探讨了长江口及邻近海域大型底栖动物功能群组成与缺氧的关系。共有82个站点被划分为三个区域，分别命名为非缺氧区、缺氧区和长江。共收集到大型底栖动物256种，分为食肉性、食腐性、杂食性、植食性和浮游性5个功能组。对三个区的大型底栖生物功能群进行相似性分析表明，非缺氧区和缺氧区的功能群分布没有显着差异，而长江口与其他两个区的功能群组成差异较大。典型对应分析结果表明，大型底栖生物官能团的分布受多种环境因素的影响，其中溶解无机氮、盐度和温度影响显着。结合以往的研究结果，我们推测大型底栖动物能够通过改变其身体形态、分布位置和群落结构来适应缺氧的发生。当环境条件阻止缺氧发生时，持久性缺氧区可以恢复其海洋微底栖动物群落。我们推测大型底栖动物能够通过改变其身体形态、分布位置和群落结构来适应缺氧的发生。当环境条件阻止缺氧发生时，持久性缺氧区可以恢复其海洋微底栖动物群落。我们推测大型底栖动物能够通过改变其身体形态、分布位置和群落结构来适应缺氧的发生。当环境条件阻止缺氧发生时，持久性缺氧区可以恢复其海洋微底栖动物群落。