To increase size or decrease density? Different Microcystis species has different choice to form blooms.
To increase size or decrease density? Different Microcystis species has different choice to form blooms.
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增加尺寸或降低密度？
DOI：
10.1038/srep37056
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发表时间：
2016-11-14
影响因子：
4.6
通讯作者：
Xiao M
中科院分区：
文献类型：
--
作者：
Li M;Zhu W;Guo L;Hu J;Chen H;Xiao M
微囊藻菌落的浮力是决定水华发生的主要因素，但由于分析方法上的挑战，对浮力季节变化的了解很少。在本研究中，通过研究形状对微囊藻菌落沉降速度的影响，建立了一种基于斯托克斯定律的精确测量微囊藻密度的方法。该方法已在太湖进行了实际应用。从1月到5月，微囊藻的平均菌落密度从995 kg m−3下降到978 kg m−3，然后在12月份增加到992 kg m−3。不同种类微囊藻的菌落密度大小顺序为：韦氏微囊藻 >；铜绿微囊藻 M.铜绿微囊藻 >；微囊藻 ；对于所有的微囊藻，随着菌落大小的增加，带有气孔的菌落密度显著增加。结果表明，5~7月份，太湖微囊藻水华形成的主要驱动力是低密度；8~10月份，韦氏微囊藻和铜绿假单胞藻种群密度大是主要驱动因素。
The buoyancy of Microcystis colonies is a principal factor determining blooms occurrence but the knowledge of seasonal variation in buoyancy is quite poor because of challenge in analysis method. In this study, a method based on the Stokes’ Law after researching on the effects of shapes on settling velocity of Microcystis colonies, whose gas vesicles were collapsed, to accurately measure density was established. The method was used in Lake Taihu. From January to May, mean density of Microcystis colonies decreased from 995 kg m−3 to 978 kg m−3 and then increased to 992 kg m−3 in December. The density of colonies in different Microcystis species was in the order M. wesenbergii > M. aeruginosa > M. ichthyoblabe. For all the Microcystis species, the density of colonies with gas vasicles increased significantly along with the increase of colony size. Our results suggested that the main driving factor of Microcystis blooms formation in Lake Taihu was low density for M. ichthyoblabe from May to July but was large colony size for M. wesenbergii and M. aeruginosa from August to October.
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影响因子：
3.1
作者：
Medrano, E. Aparicio;Uittenbogaard, R. E.;Clercx, H. J. H.
通讯作者：
Clercx, H. J. H.
影响因子：
2.1
作者：
Chu, Zhaosheng;Jin, Xiangcan;Zeng, Qingru
通讯作者：
Zeng, Qingru
影响因子：
2.1
作者：
Brookes, JD;Ganf, GG
通讯作者：
Ganf, GG
影响因子：
4.2
作者：
KONOPKA, A;KROMKAMP, JC;MUR, LR
通讯作者：
MUR, LR
影响因子：
2.9
作者：
MILLER, GL;GASEK, JM
通讯作者：
GASEK, JM