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| 1 | Distribution of green algae micro-propagules and their function in the formation of the green tides in the coast of Qinhuangdao,the Bohai Sea, China显示文摘Since 2015, a novel green tide has been recurring in the coastal areas of Qinhuangdao at the western coast of the Bohai Sea in China, threatening the environment and ecosystem of the Beidaihe seaside holiday resort along the coast. Micro-propagules of the green algae including gametes, spores, micro-germlings and micro-vegetative fragments play an important role in the formation of green tides. They serve as a 'seed source' of green macroalgae, and their distributions could reflect and influence the 'algae source' of green tides. In this study,monthly surveys in the inshore and offshore areas of the Qinhuangdao coast were conducted from April to September 2016 and in January 2017 to investigate the tempo-spatial distribution patterns and the biomass variations of the green algae micro-propagules. The obtained results show that micro-propagules were mainly distributed in the inshore areas with a significantly decreasing abundance towards offshore areas. Their biomass was highest in July and August, and lowest in winter. The areas that were affected by the green tides showed a remarkably higher abundance of micro-propagules compared to other areas. These micro-propagules could serve as the 'seed' source of green tides. Their distribution patterns indicate that the green tide in the coastal areas of Qinhuangdao originated locally. | Hongbin Han Wei Song Zongling Wang Dewen Ding Chao Yuan Xuelei Zhang Yan Li | 2019 | Acta Oceanologica Sinica2019，38，8： | 8 |
| 2 | Tempo-spatial distribution of Ulva spp.micro-propagules in the Yellow Sea during and after green tide in 2019显示文摘Large-scale green tides occur frequently in summer in the Yellow Sea in recent decade.Micropropagules,providing“seeds”for the seaweeds,play an important role in the formation of green tide.We studied the distribution pattern and genetic composition of the Ulva micro-propagules in the Yellow Sea during and after the green tide in 2019.In April,a great amount of Ulva micro-propagules was detected in the Subei Shoal,with the average density of 908 inds./L,being similar to that of previous studies.U.prolifera was found out at a low percentage(4%),and 25%of them were positive when tested by the specific marker for the floating ecotype.The percentage of U.prolifera was obviously lower than that in the same season from 2009 to 2016.Therefore,the quantity of U.prolifera micro-propagules sharply decreased.Significant variation in composition of the micro-propagules in Subei radial sand ridges was revealed in the background of the alternation of macroalgal tides in the Yellow Sea in the latest years.During the green tide in June and July,Ulva micro-propagules were detected from some nearshore sites where the floating seaweeds distributed,and U.prolifera was the dominate species.In September,when the green tide ended,no Ulva micro-propagule was detected from the open sea area of the Yellow Sea.It is indicated that the green algae micro-propagules were unlikely to exist in the open water of the Yellow Sea for a long time according to the large-scale surveys.The mechanism of preserving micro-propagules in Subei radial sand ridges,and the destination of U.prolifera micro-propagules in the open sea area of the Yellow Sea after green tide deserves further study. | Jin ZHAO Fanzhou KONG Qianchun LIU Fengjie LI Xiu WEI Tian YAN Peng JIANG | 2022 | Journal of Oceanology and Limnology2022，40，6： | 1 |
| 3 | Flocculation of Ulva microscopic propagules using modified clay:a mesocosm experiment显示文摘Microscopic propagules of Ulva species(UMPs)spread on Subei Shoal are believed to play a significant role in the formation of the Yellow Sea green tide.Previous laboratory and ship-based studies indicated that modified clay(MC)can effectively remove UMPs from the water column and restrict their germination.To evaluate the effectiveness of this method under natural conditions,a mesocosm experiment was conducted on the Zhugensha sandbank on Subei Shoal.The results show that the suspended particles on the sandbank would partially disturb the flocculation process between the MC and UMPs.However,the MC at a proper dose could effectively remove UMPs from the water column and decrease the adhesion and germination of UMPs on the nylon ropes that comprised the mariculture rafts by>75%.This method was proven a potential strategy to restrict the initial biomass accumulation of green algae on Subei Shoal.However,field trials in larger time-space scales are still needed to assess the efficiency of this method when used in the open sea. | LI Jing SONG Xiuxian FAN Xin YU Zhiming | 2020 | Journal of Oceanology and Limnology2020，38，4： | 0 |
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