Effects of mixing intensity on colony size and growth of Microcystis aeruginosa

IF 0.9 4区环境科学与生态学 Q4 LIMNOLOGY

Annales De Limnologie-international Journal of Limnology Pub Date : 2019-01-01 DOI:10.1051/LIMN/2019011

Chunni Zhong, Guijun Yang, Boqiang Qin, S. Wilhelm, Liu Yu, Han Lihua, Rui Zheng, Hongwei Yang, Zhang Zhou

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引用次数: 11

Abstract

Mixing is an integral environmental factor that affects lake ecosystems. For the cyanobacterium Microcystis, colony size is important with respects to migration velocity, how cells respond to grazing pressure, light attenuation, nutrient uptake and growth. To understand how mixing shapes colony size and the growth of Microcystis, we measured the effects of different current velocities (0, 0.16, 0.32, 0.64, and 1.28 m s−1) on M. aeruginosa in Lake Taihu. After 24 h of continuous mixing, the mean colony sizes of M. aeruginosa in the controls, 0.16, 0.32, 0.64, and 1.28 m s−1 groups were 23.6, 50.1, 92.9, 67.8, and 37.3 μm, respectively. Colony sizes of M. aeruginosa in all treatment groups were significantly larger than those in controls. As well, the concentration of soluble extracellular polysaccharide and bound extracellular polysaccharides of M. aeruginosa in all treatment groups were significantly higher than those in controls. Except for the highest level of mixing (1.28 m s−1), the growth rate of M. aeruginosa was significantly higher than that in controls. This study suggested that mixing intensity over short time periods can significantly influence colony size and the growth of M. aeruginosa.

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混合强度对铜绿微囊藻菌落大小和生长的影响

混合是影响湖泊生态系统的重要环境因子。对于微囊蓝藻来说，菌落大小对于迁移速度、细胞对放牧压力、光衰减、营养吸收和生长的反应是重要的。为了了解混合如何影响微囊藻的菌落大小和生长，我们测量了不同流速(0、0.16、0.32、0.64和1.28 m s - 1)对太湖铜绿假单胞菌的影响。连续搅拌24 h后，对照组、0.16、0.32、0.64和1.28 m s−1组铜绿假单胞菌平均菌落大小分别为23.6、50.1、92.9、67.8和37.3 μm。各处理组铜绿假单胞菌菌落大小均显著大于对照组。各处理组铜绿假单胞菌的可溶性胞外多糖和结合胞外多糖浓度均显著高于对照组。除最高混合水平(1.28 m s−1)外，铜绿假单胞菌的生长速度显著高于对照。本研究表明，短时间的混合强度可以显著影响菌落大小和铜绿假单胞菌的生长。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annales De Limnologie-international Journal of Limnology 地学-湖沼学

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Annales de Limnologie - International Journal of Limnology publishes papers on the ecology of freshwater systems, ranging from studies of aquatic organisms, physical and chemical works which relate to the biological environment, to ecological applications and frameworks for water management directives. Main topics: Ecology of freshwater systems ; biodiversity, taxonomy, distribution patterns in space and time, biology of animals and plants ; experimental and conceptual studies which integrate laboratory and/or field work on physiology, population dynamics, biogeochemistry and nutrient dynamics, management, mathematical modelling ; techniques for sampling and chemical analyses, ecological applications, procedures which provide frameworks for environmental legislation.