CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China.
CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China.
Harmful Algae. 2018 Jul;77:11-17. doi: 10.1016/j.hal.2018.05.007. Epub 2018 Jun 2.
Large scale green tides have bloomed successively in the Yellow Sea since 2007. The floating ecotype of Ulva prolifera, which is responsible for the environmental disaster, drifted a long distance during the blooming time and was exotic to the coastal area. The Yellow Sea green tide can be a potential source to incur bio-invasion. In this study, the distribution pattern and propagule pressure of the floating ecotype was investigated along the Qingdao coastline, which was seriously impacted by the green tide. Two out of 661 attached Ulva specimens collected in different seasons were identified as the floating ecotype by molecular markers, indicating that a few individuals of the floating ecotype had settled down, and their attached population could have spontaneously established. In seawater and sediments, the proportion of the floating ecotype in Ulva propagules reached up to 32% and 69% respectively when the floating algae was accumulating on seashore, which was a great propagule pressure to the local ecosystem. Results of the field test indicated that the available resources and the competition between the floating ecotype and the local Ulva species might be the main restrictions for settlement. Though the current scale of the established population is still small, the risk of biological invasion by the floating ecotype exists and it deserves more attention.
自 2007 年以来，黄海已连续发生大规模绿潮。造成这一环境灾难的大型漂浮型石莼，在其繁殖期可远距离漂浮，并入侵到沿海地区。黄海绿潮可能是引发生物入侵的潜在源头。在这项研究中，对受绿潮严重影响的青岛沿海地区的漂浮型石莼的分布模式和繁殖体压力进行了调查。在不同季节采集的 661 个附着石莼标本中，有 2 个被分子标记鉴定为漂浮型，表明少数漂浮型个体已经定居下来，其附着种群可能已经自发建立。当漂浮藻类在岸边积聚时，海水中和沉积物中漂浮型石莼繁殖体的比例分别高达 32%和 69%，这对当地生态系统造成了巨大的繁殖体压力。野外试验结果表明，定居的主要限制因素可能是可用资源和漂浮型与本地石莼物种之间的竞争。尽管目前已建立种群的规模仍然较小，但漂浮型存在生物入侵的风险，值得引起更多关注。
