Knowledge Management System Of Institute of Oceanology, Chinese Academy of Sciences
|Place of Conferral||中国科学院海洋研究所|
1）在我国黄海沿岸29个代表性站位共采集380个石莼属绿藻样本，经分子鉴定共检出15个石莼属物种，其中包括9个黄海已知种，分别为U. prolifera，U. linza，U. compressa，U. intestinalis，U. aragoënsis，U. flexuosa，U. rigida，U. australis，与U. torta。经与历史资料比对发现，冷温带种U. intestinalis已发生一定程度的北移；
3）另检出六个未定种，利用生物信息学方法，结合课题组前期在我国四大海域沿海的调查数据以及GenBank中的同源序列信息，分别鉴定为U. meridionalis，U. tepida，U. chaugulii，U. simplex，U. partita和U. splitiana，均为中国新记录种。分析了各物种在中国和全球的分布特征，提示U. meridionalis，U. chaugulii，U. partita和U. splitiana可能是入侵种，发现亚热带种U. meridionalis，U. tepida和U. chaugulii已在南海引发绿潮，其中，U. meridionalis已向温带区明显扩散；
Under the dual influence of global warming and human activities, green tides caused by the green algae Ulva is obviously on the rise around the world, especially in the coastal areas of China. In the Yellow Sea of China, green tides dominated by Ulva prolifera has become a regular marine disaster, which has a significant impact on the coastal ecosystem. To efficiently monitor and forecast green tides, it is first necessary to determine the composition and distribution characteristics of the attached Ulva species in relevant waters. Previous studies have shown that the Yellow Sea green tide is caused by a unique floating ecotype, which has distinct genetic differences with all attached populations that are widely collected from the coastal areas of China. Every year, a large number of floating green algae hit the coast of the Yellow Sea, releasing abundant germ cells. However, there is still a lack of comprehensive understanding that if the species composition of the attached Ulva has changed and in turn provide new provenance for the blooms. In China, seaweed diversity, including Ulvaspecies, has been investigated mainly based on morphological features, while there are a few characters used for identification and those features could vary widely. In view of these problems, the samples of Ulva species were collected extensively in various habitats along the coast of Yellow Sea and identified by multiple molecular markers. Based on bioinformatics method, combined with the years of our research on Ulva along the coast of China and all the sequence information that are available in NCBI, the distribution characteristics of all new records were analyzed and summarized, as well as the possible dispersal patterns. Morphological observation and description of some important green-tide-forming species were performed. The main results are as follows:
1) A total of 380 Ulva samples were collected from 29 representative sites and 15 Ulva species were identified by molecular identification, including 9 known species of the Yellow Sea: U. prolifera, U. linza, U. compressa, U. intestinalis, U. aragoënsis, U. flexuosa, U. rigida, U. australis and U. torta. By comparing with historical data, it was found that the cold temperate species U. intestinalis has shifted northward in some extent.
2) Using the molecular marker SCAR specific to the Yellow Sea green tide floating ecotype, 91 samples isolated from 10 attached Ulva populations were analyzed and the results showed that only one individual was positive, indicating that the floating ecotype U. prolifera has not established in large numbers along the coast yet.
3)In addition, based on bioinformatics method, combined with the years of our research on Ulva along the Chinese coast and highly similar sequences in GenBank, six Ulva sp. were respectively identified as U. meridionalis, U. tepida, U. chaugulii, U. simplex, U. partita and U. splitiana, which were all new records in China. Then the distribution characteristics of these six Ulva species in China and around the world were analyzed, suggesting that U. meridionalis, U. chaugulii, U. partita and U. splitiana may be new invaders. Furthermore, it has been found that the subtropical species U. meridionalis, U. tepida and U. chaugulii had caused green tides in the South China Sea, and U. meridionalis had spread significantly northward to the temperate zone.
4)As for the green-tide-forming species U. meridionalis, the morphological characteristic, individual development and reproduction were observed in detail. The results showed that the morphogenetic pattern of Ulva meridionalis is significantly different from the three known ones of Ulva species.
This research preliminarily revealed the composition and distribution characteristics of the attached Ulva species along the coast of the Yellow Sea, China, confirmed that the shore-based Ulva prolifera made no contribution to the Yellow Sea green tide, and indicated that the new green tide could be induced by bioinvasion.These research results will provide important background data and scientific basis for early monitoring, ecological effect assessment and evolution trend prediction of green tides in Chinese coast.
|Table of Contents|
|解威峰. 中国黄海沿岸定生石莼属（Ulva）绿藻的物种组成与分布特征[D]. 中国科学院海洋研究所. 中国科学院大学,2020.|
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