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The Yellow Sea green tide: A risk of macroalgae invasion
Harmful Algae ( IF 6.6 ) Pub Date : 2018-06-02 , DOI: 10.1016/j.hal.2018.05.007
Jin Zhao , Peng Jiang , Ri Qiu , Yingying Ma , Chunhui Wu , Huihui Fu , Huaxin Chen , Fuchao Li

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.



中文翻译:

黄海绿潮:大型藻类入侵的风险

自2007年以来,大规模的绿潮已在黄海中相继开花。造成环境灾害的Ulva prolifera漂浮生态型在开花期间漂移了很长一段距离,并且对沿海地区具有异国情调。黄海绿潮可能是引起生物入侵的潜在来源。本研究以青海潮汐严重影响的青岛沿岸为研究对象,研究了漂浮生态型的分布格局和繁殖压力。661个附着的Ulva中有两个通过分子标记将在不同季节收集的标本鉴定为漂浮生态型,表明该漂浮生态型的一些个体已经定居下来,并且其附着种群可以自发建立。在海水和沉积物中,当浮游藻类在海边积聚时,Ulva繁殖体中漂浮生态型的比例分别达到32%和69%,这对当地生态系统是巨大的繁殖压力。田间试验的结果表明,可用资源以及漂浮生态型和当地乌尔瓦河之间的竞争物种可能是定居的主要限制。尽管目前的定居人口规模仍然很小,但存在漂浮生态型生物入侵的风险,值得更多关注。

更新日期:2018-06-02
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