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浒苔孢子在不同材料基质上的附着萌发差异性研究
耿慧霞1,2,3, 颜天1,2,3, 于仁成1,2,4,3, 张清春1,2,3, 孔凡洲1,2,3, 周名江1
1.中国科学院海洋生态与环境科学重点实验室 青岛 266071;2.青岛海洋科学与技术国家实验室海洋生态与环境科学功能 实验室 青岛 266237;3.中国科学院海洋大科学研究中心 青岛 266071;4.中国科学院大学 北京 100049
摘要:
本研究针对黄海绿潮早期发生过程,以浒苔生殖细胞附着生长特征为切入点,以其主要原因藻种浒苔(Ulva prolifera)为材料,对比研究了不同材料附着基质对浒苔孢子附着萌发的影响。发现孢子在2—6h内的附着率达到80%,尤其是在前2h内的附着速率最快,而且在不同材料的基质上都能完成附着萌发,但萌发数量存在显著差异性,孢子在紫菜养殖筏架相关材料(塑料、竹片、尼龙网衣、塑料网衣)上的萌发率显著高于浅滩、礁石和养殖池相关材料(细砂、海泥、石块)。浒苔孢子还可以在藻段上完成附着萌发,而橡胶和鱼粉袋相关材料对浒苔孢子的萌发存在抑制作用。对比浒苔孢子和配子的萌发特性发现两者有异同点,两者在塑料、竹片等筏架相关材料上萌发率均较高,而孢子在藻段以及橡胶浸出液和鱼粉溶液中的萌发数均显著高于配子。本研究发现紫菜养殖筏架更有利于浒苔孢子的附着萌发,这进一步说明苏北浅滩数十万亩的紫菜养殖筏架在绿潮早期形成过程中为浒苔孢子提供了重要的附着基质。本研究结果将为探讨紫菜养殖筏架在绿潮早期发生过程中的重要作用,并为养殖筏架防附着材料的选用提供参考。
关键词:  浒苔  孢子  绿潮  附着基
DOI:10.11693/hyhz20180400075
分类号:Q14
基金项目:青岛海洋科学与技术国家实验室鳌山科技创新计划项目,2016ASKJ02号;中国科学院战略性先导科技专项(A类)资助,XDA11020300号;国家基金委-山东省联合基金项目,U1606404号;国家自然科学基金面上项目,41676106号。
COMPARATIVE STUDY ON GERMINATION OF ULVA PROLIFERA SPORES ON DIFFERENT SUBSTRATES
GENG Hui-Xia1,2,3, YAN Tian1,2,3, YU Ren-Cheng1,2,4,3, ZHANG Qing-Chun1,2,3, KONG Fan-Zhou1,2,3, ZHOU Ming-Jiang1
1.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;4.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
To understand the origin of green tides in the Yellow Sea, attachment and germination characteristics of Ulva prolifera spores on various substrates were studied. It was found that more than 80% of the spores could complete the attachment in 2-6h, and the attaching rate reached the peak value in the first 2h. Although the spores could complete the attachment on various substrates, their germination rates were significantly different. Our culture experiments showed that materials used in the Pyropia yezoensis aquaculture rafts in the Subei Shoal (northern Jiangsu), including plastic, bamboo, jute rope, plastic rope, nylon netting, and plastic netting, displayed much higher germination rate than those on mudflat and aquaculture ponds, including mud, sand, and rock. In addition, the germination of spores could develop from old fronds of U. prolifera. Rubber and fishmeal bags showed an inhibitory effect on the germination. Both spores and gametes showed higher germination rate in raft-related materials such as plastic and bamboo. The germination rates of spores on fronds, fishmeal bags, and fishmeal solutions were higher than those of gametes. The results suggest that the P. yezoensis aquaculture rafts provided favorable substrates for the microscopic propagules of U. prolifera, which further demonstrates that the aquaculture rafts played an important role in offering attachment conditions for the early formation of green tides. The study may help in the understanding of early development of green tides. In the future, different materials for building the raft to prevent U. prolifera spores from attachment shall be tested.
Key words:  Ulva prolifera  spores  green tides  substrates
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