Morphological characterization of suspended particles under wind-induced disturbance in Taihu Lake, China

Li, Tao; Wang, Dongsheng; Zhang, Bin; Liu, Huijuan; Tang, Hongxiao

doi:10.1007/s10661-006-9261-2

Cited by 16 publications

(12 citation statements)

References 28 publications

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“…The TN and TP levels at the different sampling sites probably were the results of the large Microcystis biomass but not the reasons causing the distribution of Microcystis, since during the experiment there was little correlation between Chl a and the dissolved nutrients in the study area. The distribution of Microcystis in Meiliang Bay could not be caused by inflows/outflows or density flows, because the main inflowing rivers were closed during the experiment, and Taihu Lake is a large, shallow, freshwater lake, generally well-mixed by wind (Li et al 2007). Therefore, the distribution of Chl a in the present study should be caused by the wind-driven drift of surface films and/or the transport of Microcystis with wind-driven flows.…”

Section: Discussionmentioning

confidence: 99%

Horizontal distribution and transport processes of bloom-forming Microcystis in a large shallow lake (Taihu, China)

Kong

Chen

et al. 2010

Limnologica

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a b s t r a c tThe horizontal distribution of bloom-forming Microcystis in a specific lake area and the transport of Microcystis by wind-driven lake currents between Meiliang Bay and the open water of Taihu Lake were measured during continuous field observations from August 21 to 25, 2006. During the observations, the horizontal distributions of Microcystis, represented by Chlorophyll a, showed a clear concentration toward downwind lake areas. According to the lake currents and the Chl a concentrations on the boundary line between the Meiliang Bay and the open water, the transported Chl a was less than 2% of the total weight of Chl a in Meiliang Bay on August 22, 24 and 25. The results suggest that the horizontal distribution of the bloom-forming Microcystis was strongly affected by the wind conditions, and the wind-driven Microcystis accumulation was mainly determined by surface drift; the transport of Microcystis by lake currents was much less important in this large, shallow lake.

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Section: Discussionmentioning

confidence: 99%

Horizontal distribution and transport processes of bloom-forming Microcystis in a large shallow lake (Taihu, China)

Kong

Chen

et al. 2010

Limnologica

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“…As a large, shallow, and freshwater lake, there were almost no density flows. Furthermore, minor and transient thermal stratification was easily broken down by the wind (LI et al, 2007). Therefore, mixing of water column is largely determined by wind speed in Taihu Lake.…”

Section: Discussionmentioning

confidence: 99%

Effects of Light and Wind Speed on the Vertical Distribution of Microcystis aeruginosa Colonies of Different Sizes during a Summer Bloom

Kong

2009

International Review of Hydrobiology

131

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Different dynamics, of the vertical distribution of Microcystis aeruginosa colonies of different sizes, were examined in a large shallow lake (Taihu Lake) during a summer bloom. During the observation the Microcystis colonies, larger than 120 μm, were mainly concentrated in the upper layer both under calm and windy conditions. Colonies from 36 μm to 120 μm showed a clear relationship to wind conditions whereas colonies less than 36 μm showed a nearly uniform vertical distribution at the different depths. There was no clear relationship between the vertical distribution of colonies larger than 36 μm and light intensity. However, at solar noon, colonies less than 36 μm were mainly distributed in the middle layers of the water column. The results indicate that small colonies are easily affected by the wind-induced mixing, and they show an ability for active movement in response to light intensity under calm conditions. In contrast, large colonies tend to show little diurnal repositioning to light intensity and thereby are mainly concentrated in the surface layer.

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“…In the present study, the physical breaking up of large colonies did not seem to be related to mechanical disturbance. The slight vertical temperature gradient in the lake on August 4-6 suggests that turbulence was not strong at all during the incubations, even though Lake Taihu is easily mixed by wind (Li et al 2007). The use of the sieve to separate Microcystis colonies possibly overestimated the quantity of small colonies and single cells because some larger colonies may have been disrupted, even though the process was done very gently.…”

Section: Discussionmentioning

confidence: 98%

Effect of Excess Light on Colony Size and Photosynthetic Quantum Yield ofMicrocystisspp. during a Summer Bloom

Wu¹,

Kong²

2010

Journal of Freshwater Ecology

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Variation of Microcystis spp. (Cyanobacteria) colony size and photosynthetic quantum yield were examined during a summer bloom in a large shallow lake (Lake Taihu). After exposure to direct solar radiation for four hours, about 60% of the colonies larger than 36 pm had changed into smaller colonies and single cells. Meanwhile, the photosynthetic quantum yields of Microcystis spp. decreased rapidly. Under a treatment of 30% of the light intensity of that at the surface, only about 10% of the large colonies changed into smaller colonies and single cells, and the photosynthetic quantum yields showed only a slight decrease. When the samples were incubated at the surface layer and 0.5 m depth from 0800 h to 1800 h, the number of small colonies and single cells increased more markedly than that at 1.0 m depth. During this incubation, the photosynthetic quantum yields of the Microcystis spp. at the surface water were significantly lower than that at the 0.5 m and 1.0 m depths from 1000 h to 1800 h. Direct exposure to excess light severely reduced the photosynthetic quantum efficiency of the Microcystis spp. cells but also induced large Microcystis spp. colonies to change into smaller ones and single cells.

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Morphological characterization of suspended particles under wind-induced disturbance in Taihu Lake, China

Cited by 16 publications

References 28 publications

Horizontal distribution and transport processes of bloom-forming Microcystis in a large shallow lake (Taihu, China)

Horizontal distribution and transport processes of bloom-forming Microcystis in a large shallow lake (Taihu, China)

Effects of Light and Wind Speed on the Vertical Distribution of Microcystis aeruginosa Colonies of Different Sizes during a Summer Bloom

Effect of Excess Light on Colony Size and Photosynthetic Quantum Yield ofMicrocystisspp. during a Summer Bloom

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