Article
Plant Sciences
Xiaoxiang Miao, Jie Xiao, Shiliang Fan, Yu Zang, Xuelei Zhang, Zongling Wang
Summary: The epiphytic gammarid species, Apohyale sp., plays a significant role in controlling the floating algal biomass in the Yellow Sea Green Tide. The grazing behavior of Apohyale sp. affects the growth rate of algae, potentially leading to positive feedback on the floating algal biomass. Further research is needed to understand the population dynamics of these primary predators and their correlation with the expansion or decline of the Green Tide in the Yellow Sea.
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Oceanography
Zhihua Xu, Wenchao Meng, Shuqin Li, Jingzhu Shan
Summary: Green tides in China have become a serious and recurrent environmental issue, causing harm to the marine ecological environment. This study investigates residents' willingness to pay for the governance of green tides. The results show that residents are willing to pay an average of 68.59 CNY/year (US $9.85) for the complete disappearance of green tides and the restoration of the coastal environment.
OCEAN & COASTAL MANAGEMENT
(2023)
Article
Marine & Freshwater Biology
Hongbin Han, Yan Li, Zongling Wang, Wei Song, Xiaojun Ma
Summary: This study investigated the temporal and spatial distribution of green algae micro-propagules in the coastal waters of Qinhuangdao after the 2020 green tides bloom. The results showed that Jinmenghaiwan bath had significantly higher numbers of green algae micro-propagules compared to other surveyed areas. These micro-propagules displayed a pattern of high abundance near the shore and lower abundance away from the shore. Furthermore, the numbers of green algae micro-propagules, as well as the proportion of Ulva prolifera micro-propagules, decreased considerably from October 2020 to April 2021 compared to the period from October 2016 to April 2017. This may explain the significant reduction in the green tides scale in 2021 compared to 2017. The findings of this study provide a theoretical basis for early warning and control of green tides in Qinhuangdao.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Marine & Freshwater Biology
Bing-Han Li, Chun-Ying Liu, Xue Deng, Ke-Ke Wang, Lu Han, Yu-Huan Huang, Xinyu Li, Wei-Jun Cai
Summary: Green tides of Ulva prolifera have been occurring annually in the southern Yellow Sea since 2007, affecting the seawater carbonate system by altering pH, DIC, TA, and pCO(2) levels. Compared to nearby areas without the bloom, the green tide leads to reduced pH and DIC, but increased TA and pCO(2).
Article
Microbiology
Guihua Zhao, Hui He, Hualong Wang, Yantao Liang, Cui Guo, Hongbing Shao, Yong Jiang, Min Wang
Summary: In this study, the bacterial and archaeal communities during an Ulva prolifera green tide in coastal Qingdao areas were analyzed using Illumina high-throughput sequencing. The diversity and structure of these communities, as well as the microbial co-occurrence network, were found to vary during the green tide. The decline phase was found to favor bacterial and archaeal diversity and richness. Significant differences were observed in the bacterial and archaeal communities between outbreak and decline phases. The microbial co-occurrence network was simpler and less connected during the outbreak phase. Flavobacteriales, Rhodobacterales, and Marine Group II (MGII) were identified as important organisms during the green tide. Temperature, chlorophyll a content, and salinity were found to have an important impact on the variations in bacterial and archaeal communities during the green tide.
Article
Environmental Sciences
Meijia Jiang, Lin Gao, Ruiping Huang, Xin Lin, Guang Gao
Summary: This study investigated the physiological and genetic responses of two macroalgae species, Ulva intestinalis and Gracilariopsis lemaneiformis, to simulated marine heatwaves under different nitrate conditions. The results showed that Ulva intestinalis was able to survive heatwaves by shifting to micropropagules under nitrogen limited conditions and protecting its photosynthesis under nitrogen replete conditions. In contrast, Gracilariopsis lemaneiformis died of bleaching regardless of nitrogen availability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Feng Liu, James T. Melton
Summary: This study sequenced and compared three complete chloroplast genomes of Ulva compressa, revealing that variations in Ulva cpDNA size are mainly caused by intron differences, foreign DNA integration, and non-coding regions. Specific intron types were detected at various insertion sites in Ulva chloroplast genomes, showing a high level of plasticity in their structure due to rearrangement events. Additionally, a degenerate group II intron was found in all Ulva species but not in related taxa, suggesting an independent invasion event in their common ancestor.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Biodiversity Conservation
Kai Xue, Kepeng Yu, Hang Zhang
Summary: Rapid urbanization in China has led to an uneven distribution of Urban Green Space (UGS) resources. This study analyzes the accessibility of UGS in Qingdao City Center using the expanded model of Gaussian Two-Step Floating Catchment Area Method. The results show a circular structure of UGS accessibility with a gap between supply and demand. Based on the analysis, optimization strategies and spatial intentions are proposed.
ECOLOGICAL INDICATORS
(2023)
Article
Environmental Sciences
Xue Yang, Kun Lin, Lijun Tan, Jiangtao Wang
Summary: A mesocosm experiment conducted on the Qingdao coast observed that nutrient enrichment slightly delayed the decomposition trend of Ulva prolifera and increased the amounts of carbon and nitrogen fixed by the algae. The study also found that high nutrient levels accelerated the degradation of organic matter and reduced the bioavailability of dissolved organic matter in seawater. This research provides insights into the decomposition process of green tides and its impact on coastal ecosystems and biogenic element cycling.
MARINE POLLUTION BULLETIN
(2021)
Article
Plant Sciences
Ricardo Bermejo, Maria Galindo-Ponce, Nessa Golden, Charlene Linderhoff, Svenja Heesch, Ignacio Hernandez, Liam Morrison
Summary: The use of molecular identification tools has revealed that multispecific green tides are more common than previously believed. Seasonal successions and the role of photoperiod and temperature in bloom development have been observed in cold temperate estuaries. Studies and experiments indicate that water temperature and photoperiod influence the growth and development of different species of Ulva algae, with potential consequences for biomass balance and peak bloom in Irish estuaries.
JOURNAL OF PHYCOLOGY
(2023)
Article
Chemistry, Medicinal
Limin Ning, Zhong Yao, Benwei Zhu
Summary: The high-value utilization of Ulva bioresources has gained increasing attention due to green tide blooms. Ulva polysaccharides and oligosaccharides have promising potential as new functional foods or food additives. However, there is a lack of comprehensive reviews on the recent advances of their structure, extraction, preparation, activity, and applications.
Article
Environmental Studies
Zhihua Xu, Shuqin Li, Jingmei Li, Jingzhu Shan
Summary: The study found that residents' willingness to pay for the management of Ulva prolifera bloom is similar across different scenarios, and most respondents believe that their responses will impact policy and payment outcomes.
Article
Environmental Sciences
Guihua Zhao, Hui He, Ming Yue, Hualong Wang, Hongbing Shao, Min Wang
Summary: This study found that the structure of denitrifying bacterial community during a green tide is closely related to environmental factors and chlorophyll content. The response and interactions of nirK and nirS denitrifying bacteria to the green tide are also different.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Yichao Tong, Lihua Xia, Jinlin Liu, Shuang Zhao, Yuqing Sun, Tingjian Wu, Zhangyi Xia, Shuang Li, Jiaxing Cao, Jianheng Zhang
Summary: This study identified U. aragoensis as a constituent species of green tides in the Southern Yellow Sea (SYS) based on molecular data. The study also found that U. aragoensis was more prevalent in micro-propagules cultured from surface seawater during an early-stage green tide in 2021. Comparing gene sequences, tufA and rbcL genes were determined to be the most suitable DNA barcodes for distinguishing U. aragoensis. Haplotype analysis revealed close similarities between floating U. aragoensis and its micro-propagules. This research clarifies the species composition of SYS green tides and provides insights into the relationship between micro-propagules and green tide macroalgae.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
Eun Ju Kang, A-Reum Han, Ju-Hyoung Kim, Il-Nam Kim, Sukyeon Lee, Jun-Oh Min, Bo-Ra Nam, Young-Joon Choi, Matthew S. Edwards, Guillermo Diaz-Pulido, Changsin Kim
Summary: The study found that under ocean acidification conditions, Ulva ohnoi algae prefer CO2 and NH4+ as carbon and nitrogen sources, leading to an increase in N content and better performance in photosynthesis and growth, thus potentially increasing their bloom potential; however, elevated temperatures decrease photosynthesis and growth, reducing their bloom potential.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
