Mapping the main harmful algal species in the East China Sea (Yangtze River estuary) and their possible response to the Main ecological status and global climate change via a global vision

河口 长江 中国 气候变化 中国海 环境科学 全球变暖 生态学 全球变化 地理 海洋学 环境资源管理 生物 地质学 考古
作者
Jiarong Hu,Junjie Zheng,Douding Lu,Xiaojian Dai,Ruifang Wang,Yuanli Zhu,Bum Soo Park,Changpeng Li,Jin Ho Kim,Ruoyu Guo,Pengbin Wang
出处
期刊:Science of The Total Environment [Elsevier]
卷期号:: 175527-175527
标识
DOI:10.1016/j.scitotenv.2024.175527
摘要

The Yangtze River Estuary (YRE) is one of the areas in China most severely affected by harmful algal blooms (HABs). This study explored the distributive patterns of HABs in the YRE and how they are influenced by the El Niño-Southern Oscillation (ENSO) and other environmental factors. Quantitative real-time PCR (qPCR) was employed to detect and quantify the four predominant HAB species in the YRE, Karenia mikimotoi, Margalefidinium polykrikoides, Prorocentrum donghaiense, and Heterosigma akashiwo. Additionally, the study analyzed how turbidity, pH, salinity, and temperature influence these algae. Distribution of the four HAB species in the YRE area shows clear geographical variations: K. mikimotoi is predominantly found in the northwest and central sea areas, M. polykrikoides (East Asian Ribotype, EAR) is mainly distributed in the southeastern part, P. donghaiense is abundant in the northern regions, and H. akashiwo is especially prevalent at stations S26 and S27 in the northeastern part of the study area. HABs dominated by H. akashiwo and P. donghaiense were observed in the northeastern sea area of the YRE on July 22, 2020. Our study reveals that K. mikimotoi, M. polykrikoides (EAR), and P. donghaiense are mainly affected by turbidity, pH, and salinity, while temperature predominantly influences the blooms of H. akashiwo. Moreover, runoff in the YRE has a certain correlation with ENSO events, which may also impact the nutrient content of the region. The findings of this study illustrate the distributive patterns of the four HAB species under various ecological conditions in the YRE and emphasize the importance of establishing practical cases for future warning systems. To better understand how climate change affects HABs, exploring the link between ENSO and HABs is essential.
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