| 引用本文: | 马薇薇,王楠,孙妍,孙松.盐度对浒苔(Ulva prolifera)微观繁殖体萌发生长及藻体繁殖的影响.海洋与湖沼,2023,54(6):1622-1633. |
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| 盐度对浒苔(Ulva prolifera)微观繁殖体萌发生长及藻体繁殖的影响 |
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马薇薇1,2,3, 王楠1,2, 孙妍1,2, 孙松1,2,3
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1.中国科学院海洋研究所 海洋生态与环境科学重点实验室 山东青岛 266071;2.中国科学院大学 北京 100049;3.山东胶州湾海洋生态系统国家野外科学观测研究站 山东青岛 266071
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| 摘要: |
| 黄海绿潮起源于苏北浅滩, 每年夏天漂移到青岛沿岸泛滥成灾, 对生态环境造成严重破坏。苏北浅滩受沿岸径流输入影响, 盐度变化范围大, 青岛海域盐度较稳定, 稍高于苏北浅滩。盐度对浒苔微观繁殖体萌发、藻体生长及繁殖过程具有重要作用, 通过室内连续受控实验, 系统研究了固定盐度(5、10、15、20、25、30、33、35)和变化盐度(盐度逐渐降低)对浒苔微观繁殖体固着、萌发、藻体生长和繁殖不同阶段的影响, 主要结论如下: 固着阶段, 盐度5不利于浒苔微观繁殖体的固着, 盐度10~35对微观繁殖体固着的影响不显著, 相同盐度下, 孢子的固着量显著高于配子。萌发阶段, 不同盐度(5~35)及不同盐度变化形式对微观繁殖体(孢子和配子)的萌发没有显著影响, 孢子的萌发速度快于配子, 最终均能完全萌发。生长阶段, 低盐(5~15)不利于浒苔幼苗的生长。繁殖阶段, 当盐度≤10时, 浒苔不进行生殖活动; 盐度15~35范围内, 浒苔可以产生微观繁殖体, 完成一个完整的生活史; 在绿潮形成过程中, 孢子的生殖策略为K对策, 配子的生殖策略为R对策。上述结论表明, 在苏北浅滩和青岛海域, 盐度不是限制浒苔发生发展及繁殖过程的关键环境因子, 明确了盐度在绿潮发生过程的作用, 为揭示绿潮暴发机制提供科学依据。 |
| 关键词: 盐度 浒苔(Ulva prolifera) 浒苔微观繁殖体 萌发生长 繁殖 |
| DOI：10.11693/hyhz20230400085 |
| 分类号:P76 |
| 基金项目:崂山实验室科技创新项目资助,LSKJ202204005号 |
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| EFFECT OF SALINITY ON THE GERMINATION AND GROWTH OF MICROPROPAGULES AND ALGAL REPRODUCTION OF ULVA PROLIFERA |
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MA Wei-Wei1,2,3, WANG Nan1,2, SUN Yan1,2, SUN Song1,2,3
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1.Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Jiaozhou Bay Marine Ecosystem Research Station, Chinese Academy of Sciences, Qingdao 266071, China
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| Abstract: |
| The Yellow Sea green tide originates from the Subei shoal and drifts to the coast of Qingdao every summer, causing serious damage to the ecological environment. The salinity of Qingdao coastal waters is more stable and slightly higher than that of Subei shoal. Salinity plays an important role in the germination of micropropagules, algal growth, and reproduction process of Ulva prolifera. Therefore, the effects of fixed salinity (5, 10, 15, 20, 25, 30, 33, 35) and variable salinity (salinity gradually decreases) on different stages of U. prolifera life history attachment, germination, growth, and reproduction were systematically studied through indoor continuous controlled experiments. Results show that the effect of salinity 10~35 on micropropagules attachment was not significant, and the attachment amount of spores was significantly higher than that of gametes at the same salinity. In the germination stage, different salinities (5~35) and the forms of salinity changes did not show significant effects on the germination of micropropagules (spores and gametes), the germination of spores was faster than that of gametes, and both eventually germinated completely. In the growth stage, low salinity (5~15) was not conducive to the growth of U. prolifera seedlings. In the reproduction stage, when the salinity was ≤10, the U. prolifera did not reproduce. In the range of salinity 15~35, U. prolifera could produce micropropagules and completed its life history. In the process of green tide formation, the reproductive strategy of spores was the K response and that of gametes was the R response. The above findings indicate that salinity was not a key environmental factor limiting the development and reproduction process of U. prolifera in the Subei Shoal and Qingdao coastal waters, clarifying the role of salinity in the process of green tide occurrence and providing a scientific basis for understanding the mechanism of green tide outbreak. |
| Key words: salinity Ulva prolifera micropropagules of Ulva prolifera germination and growth reproduction |
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