Effects of mussel-phytoplankton interactions on the aquatic environment

文献类型： 外文期刊

第一作者： Zhang, Rong

作者： Zhang, Rong;Zhang, Rong;Fang, Jinghui;Qin, Xiaofang;Zeng, Chao;Fang, Jinghui;Zhang, Yitao;Wang, Junwei;Zheng, Xiaodong

作者机构：

关键词： Mytilus edulis; Density; Nutrients; Phytoplankton; Carbonate system

期刊名称：AQUACULTURE REPORTS （ 影响因子：3.2； 五年影响因子：3.5 ）

ISSN： 2352-5134

年卷期： 2024 年 37 卷

页码：

收录情况： SCI

摘要： A five-day in situ experiment was conducted in plastic enclosures to investigate the effects of different densities of the mussel Mytilus edulis, and sampling time on water variables, and phytoplankton community structure in Sanggou Bay (Shandong, China). The tested mussel densities were low (LD300: 300 g/m(3)), medium (MD600: 600 g/m(3)), high (HD900: 900 g/m(3)), and sampling times were at 6:00 and 17:00 h. The water variables analyzed as indicators were pH, dissolved oxygen, nutrients, carbonate system, pCO(2), and chlorophyll-a (Chl-a). The results showed that density and sampling time had highly significant effects on all water parameters and phytoplankton abundance, except for dissolved oxygen (P<0.01). At the same sampling time, pH, c[CO32-] and Chl-a concentrations in the water column of LD300 treatment were much higher than those of MD600 and HD900 treatments, while c[HCO3-], c[CO2] and pCO(2) were significantly lower than those of MD600 and HD900 treatments (P<0.01). Phosphate was the main limiting nutrient for phytoplankton growth. Chl-a concentrations increased and then decreased significantly in LD300 and MD600 treatments, while it diminished continuously in HD900 treatment. The higher M. edulis density showed higher correlation with picophytoplankton abundance and Chl-a concentrations. Not only the phytoplankton structure was affected, but also the condition index of the HD900 treatment was significantly reduced (P<0.05). The present study showed LD300 and MD600 treatments significantly promoted the growth of picophytoplankton. The selective filtration of M. edulis for microphytoplankton and nanophytoplankton were much higher than those for picophytoplankton. The combined decrease in competitors (micro- and nanophytoplankton) led to a substantial increase of picophytoplankton abundance in shellfish farming areas. The interactions between mussel and phytoplankton significantly affected the water environment. However, well designed integrated shellfish and algae aquaculture might mitigate the adverse impacts.

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