华东师范大学学报(自然科学版) ›› 2019, Vol. 2019 ›› Issue (2): 135-146.doi: 10.3969/j.issn.1000-5641.2019.02.015

• 生态与环境科学 • 上一篇    下一篇

硅酸盐浓度对羽纹纲藻类圆弧运动的影响——以舟形藻为例

王峰1, 赵丽侠1, 朱政1, 胡文思1, 刘权兴1,2   

  1. 1. 华东师范大学 河口海岸学国家重点实验室, 上海 200062;
    2. 华东师范大学 生态与环境科学学院, 上海 200062
  • 收稿日期:2017-12-08 出版日期:2019-03-25 发布日期:2019-03-27
  • 通讯作者: 刘权兴,男,教授,博士生导师,研究方向为理论生态学.E-mail:qxliu@sklec.ecnu.edu.cn E-mail:qxliu@sklec.ecnu.edu.cn
  • 作者简介:王峰,男,硕士研究生,研究方向为海洋生态学.E-mail:fwangecnu@163.com.
  • 基金资助:
    国家重点研发计划(2016YFE0103200);青年千人计划

The effect of dissolved silicic acid on circular motion behaviors in pennatae: A case study on diatom Navicula arenaria var. rostellata

WANG Feng1, ZHAO Li-xia1, ZHU Zheng1, HU Wen-si1, LIU Quan-xing1,2   

  1. 1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;
    2. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200062, China
  • Received:2017-12-08 Online:2019-03-25 Published:2019-03-27

摘要: 以舟形藻为研究对象,以f/2+Si培养基中硅酸盐浓度30mg/L为基准,设置不同硅酸盐浓度梯度(1、15、30、60、120和240 mg/L),通过显微跟踪技术获取舟形藻个体细胞的运动轨迹并研究硅酸盐浓度梯度对舟形藻运动行为的影响.发现如下结果.①舟形藻的主要运动方式为大量非恒速圆弧运动伴随着少量的随机倒退行为,圆弧运动过程曲率基本维持不变;倒退时刻运动方向和速度发生显著变化,此时夹角小于90°,倒退前后运动速度降低.②舟形藻在短时间尺度下呈现弹道行为;在中时间尺度下呈现超扩散行为;在长时间尺度下呈现布朗运动扩散行为.③舟形藻的运动行为显著依赖硅酸盐浓度,微量硅酸盐浓度(1mg/L,Na2SiO3)和高硅酸盐浓度(120 mg/L,Na2SiO3;240 mg/L,Na2SiO3)环境下会抑制舟形藻运动,低硅酸盐浓度(15mg/L,Na2SiO3)和中硅酸盐浓度(30 mg/L,Na2SiO3;60 mg/L,Na2SiO3)下会增强舟形藻的扩散系数.硅酸盐浓度对硅藻个体运动行为的研究帮助理解硅藻的觅食策略和聚集行为,为进一步理解硅藻水华的发生、海洋生物污损现象和海雪现象的爆发提供思路.

关键词: 硅藻, 舟形藻, 运动行为, 硅酸盐浓度

Abstract: Diatoms play an important role in the primary productivity of aquatic systems and in driving the global silicon and carbon cycles in biogeochemistry. Navicula (Navicula arenaria var. rostellata) is a widely distributed diatom species in polluted aquatic and coastal ecosystems. In this study, we treat Navicula as the research object, using f/2+Si culture medium 30 mg/L dSi concentration as a reference to set different dSi concentration gradients (1 mg/L, 15 mg/L, 30 mg/L, 60 mg/L, 120 mg/L, 240 mg/L); based on the Navicula experiments and tracking of cell trajectories and behavior analysis, we explore the effects of different concentrations of dSi on diatom movement behaviors and diffusion coefficients. We found that:Their trajectories display circular motion associated with stochastic disruption. The curvature of the circular arc remains unchanged, and the direction and speed of the motion change significantly at the reverse time point; when the angle is less than 90 degrees; moreover, the velocity decreases before and after the reverse. Their motions display ballistic behavior on short time scales, Brownian-motion on long time scales, and super-diffusion on intermediate time scales. Miniscule and high dSi concentrations effectively inhibit active dispersal, whereas low and intermediate dSi concentrations promote dispersal on diatom cells. Here, our study of individual movement behaviors on diatoms helps to improve our understanding of foraging strategy and aggregation behavior in diatom biofilms; in addition, it provides new ideas on the outbreak of algal bloom, the marine biofouling phenomena, and marine snow phenomena.

Key words: diatoms, Navicula, motion behavior, dissolved silicic acid

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