Du Haina, Chen Yang, Liu Kuiyan, Li Yingchao, Liu Shuya, Chen Nansheng
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao 266200, China; College of Marine Science, University of Chinese Academy of Sciences, Beijing 100039, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
Research Center for Marine Science, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China; Hebei Key Laboratory of Ocean Dynamics, Resources and Environments, Qinhuangdao 066004, China.
Mar Pollut Bull. 2025 Oct;219:118236. doi: 10.1016/j.marpolbul.2025.118236. Epub 2025 Jun 4.
The coastal region offshore Qinhuangdao in China has been known to develop harmful algal blooms (HABs) with high frequency and devastating negative impacts. However, due to technological limitations in species identification and infrequent sampling, the diversity and dynamics of HAB species in this ocean region remain poorly understood. To address these issues, this study conducted a metabarcoding analysis of yearlong weekly samples in the Qinhuangdao region from September 2022 to August 2023. Based on metabarcoding analysis of the molecular marker 18S rDNA V4 sequences, a total of 316 phytoplankton species were identified, belonging to 304 genera and 8 phyla, with Dinoflagellata being the most dominant represented phylum. Of these phytoplankton species, 67 potential HAB species were identified, including 21 species being identified for the first time in the Qinhuangdao region. Sixty-one phytoplankton species (including HAB species) identified in the Qinhuangdao region exhibited strong seasonal dynamics. Environmental factors (especially temperature) and interspecific interactions may be the main driving factors affecting the diversity and dynamics of HAB species. In conclusion, this study provides a detailed description of the species composition, temporal dynamics, environmental driving factors, and interspecific interactions of HAB species in the Qinhuangdao region. The high biodiversity of HAB species in the local coastal ecosystem indicates the need for long-term monitoring to further study and prevent potential HABs.
中国秦皇岛近海的沿海地区频繁爆发有害藻华（HABs），造成了毁灭性的负面影响。然而，由于物种鉴定技术的局限性和采样频率较低，该海域有害藻华物种的多样性和动态变化仍知之甚少。为了解决这些问题，本研究对2022年9月至2023年8月秦皇岛地区全年每周的样本进行了宏条形码分析。基于对分子标记18S rDNA V4序列的宏条形码分析，共鉴定出316种浮游植物，分属于304属8门，其中甲藻门是最主要的门类。在这些浮游植物物种中，鉴定出67种潜在的有害藻华物种，其中21种是在秦皇岛地区首次发现。秦皇岛地区鉴定出的61种浮游植物（包括有害藻华物种）表现出强烈的季节动态。环境因素（尤其是温度）和种间相互作用可能是影响有害藻华物种多样性和动态变化的主要驱动因素。总之，本研究详细描述了秦皇岛地区有害藻华物种的组成、时间动态、环境驱动因素和种间相互作用。当地沿海生态系统中有害藻华物种的高生物多样性表明需要进行长期监测，以进一步研究和预防潜在的有害藻华。
