Size-fractionated eukaryotic microalgae and its influencing factors Dachangshan Island and its adjacent waters
SONG Lun1, BI Xiang-dong2, SONG Guang-jun1, DU Jing1, WU Jin-hao1, WANG Zhi-song1, HU Chao-kui1
1. Liaoning Ocean and Fisheries Science Research Institute, Key Laboratory of Marine Biological Resources and Ecology, Dalian 116023, China;
2. Key Laboratory of Aquatic-Ecology and Aquaculture of Tianjin, College of Fishery, Tianjin Agricultural University, Tianjin 300384, China
In this study, constitution of microalgal particle size in the adjacent waters of Dachangshan island was investigated in 2018 using the high-throughput sequencing-molecular identification and classification technology, and the estimation error of the classification method based on chlorophyll a was assessed. The result showed that the average estimation error of microalgae with a particle size (< 3μm) assessed using the classification method based on chlorophyll a reached 82%, leading to serious underestimation in the composition of microalgae with small particle size. Base on the molecular identification and classification technology, the average biomass proportion of microalgae with small particle size (< 3μm) was 86% in spring, 52% in summer, and 20% in autumn. Aureococcus anophagefferens with the biomass proportion of 41% was the dominant microalga in spring while Ostreococcus tauri with the biomass proportion of 21% became dominant in summer. Both A. anophagefferens and O. tauri could inhibit the feeding and growth of filter-feeding bivalves, which would pose a potential risk to bivalve farming. Top-down effects of bivalve feeding and environmental factors, such as total nitrogen, total phosphorus, and dissolved silicon, influenced the particle size constitution/characteristic of microalgae in this area.
宋伦, 毕相东, 宋广军, 杜静, 吴金浩, 王志松, 胡超魁. 海洋真核微藻粒级结构及其环境影响因素[J]. 中国环境科学, 2020, 40(6): 2627-2634.
SONG Lun, BI Xiang-dong, SONG Guang-jun, DU Jing, WU Jin-hao, WANG Zhi-song, HU Chao-kui. Size-fractionated eukaryotic microalgae and its influencing factors Dachangshan Island and its adjacent waters. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(6): 2627-2634.
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