Functional analysis of Microcystis vertical migration: A dynamic model as a prospecting tool

Rabouille, Sophie; Salençon, Marie-José; Thébault, Jean-Marc

doi:10.1016/j.ecolmodel.2005.02.015

Cited by 26 publications

(17 citation statements)

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“…Many researchers have established mathematical models to study the vertical migration and distribution of Microcystis colonies under different hydrodynamic conditions (Visser et al, 1997;Wallace et al, 2000;Huisman and Sommeijer, 2002;Rabouille et al, 2005;Serizawa et al, 2008;Chen et al, 2009). Visser et al (1997) combined a model of cell density change with Stokes' law, and simulated the vertical migration of Microcystis colonies in static water.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the vertical migration of Microcystis (cyanobacteria) colonies based on turbulence drag

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of the vertical migration of Microcystis (cyanobacteria) colonies based on turbulence drag

et al. 2016

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“…Colony formation has an important role in vertical distribution by affecting both passive and active movement of Microcystis (Rabouile et al 2005, Visser et al 1997, even though the role of colony size in controlling the distribution of buoyant phytoplankton is somewhat paradoxical. Recent studies show that large colonies are more…”

Section: Discussionmentioning

confidence: 99%

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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“…It simulates, at a daily scale, changes in growth and vertical migration of colonies due to the dynamics of the metabolism of carbon reserves during photosynthesis and biosynthesis. A previous analysis of this model under permanent conditions of light and temperature in a non-turbulent water column permitted us: (1) to independently explore the influence of light and of temperature on the migration pattern and (2) to test the variability of these migratory responses as a function of colony diameter (Rabouille et al 2005). In the present study, we have analysed the combined influence of light, temperature and mixing on the growth and migration of colonies with different diameters.…”

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“…colonies in the water column of a lake. A complete description of the model structure is given in Rabouille et al (2005); here, we briefly outline the main components and relations. The growth model is based on a mass balance.…”

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Functional analysis of Microcystis vertical migration: a dynamic model as a prospecting tool. II. Influence of mixing, thermal stratification and colony diameter on biomass production

Rabouille

Salençon²

2005

Aquat. Microb. Ecol.

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YOYO is a deterministic model developed to represent the growth and vertical movement of Microcystis sp. colonies in the water column. Migration of colonies is represented in the model through the dynamics of carbon-reserve metabolism during photosynthesis and biosynthesis. It was used to quantify combined impacts of light, temperature and mixing on the growth and migration of colonies with different diameters. These 3 factors characterise a vertically non-homogeneous water column. Although conditions of simulation are schematic, they allow identification of situations in which the ability to regulate buoyancy gives Microcystis an advantage over non-mobile phytoplankton. Even if some vertical structures appear unfavourable for the exploitation of light energy, they nevertheless offer some advantages for the access to nutrients. Each diameter has particular benefits, and the increase in diameter observed throughout the year is probably an ecological adaptation to fluctuations in the environment at a seasonal scale.KEY WORDS: Microcystis · Photosynthesis · Carbohydrates · Vertical migration · Hydrodynamics · Mixing zone · Thermocline · 1-D mathematical model Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 39: [281][282][283][284][285][286][287][288][289][290][291][292] 2005 ( Rabouille et al. 2003). It simulates, at a daily scale, changes in growth and vertical migration of colonies due to the dynamics of the metabolism of carbon reserves during photosynthesis and biosynthesis. A previous analysis of this model under permanent conditions of light and temperature in a non-turbulent water column permitted us: (1) to independently explore the influence of light and of temperature on the migration pattern and (2) to test the variability of these migratory responses as a function of colony diameter (Rabouille et al. 2005). In the present study, we have analysed the combined influence of light, temperature and mixing on the growth and migration of colonies with different diameters. Most of the simulated diameters were chosen according to field observations in the Grangent reservoir (Loire, France) and are thus representative of colony sizes actually found in this reservoir throughout spring and summer. The largest diameters, though much less common, were nevertheless tested in the model, in order to cover the largest possible range of colony sizes and to estimate the behaviour of such colonies. Present simulations are not intended to represent realistic conditions. They are part of a model sensitivity analysis with regard to specific forcing conditions. BRIEF DESCRIPTION OF THE MODELYOYO is a deterministic model (1-dimensional vertical) intended to represent the growth and vertical movements of a population of Microcystis sp. colonies in the water column of a lake. A complete description of the model structure is given in Rabouille et al. (2005); here, we briefly outline the main components and relations. The growth model is based on a mass balance. It focuses...

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Functional analysis of Microcystis vertical migration: A dynamic model as a prospecting tool

Cited by 26 publications

References 50 publications

Numerical simulation of the vertical migration of Microcystis (cyanobacteria) colonies based on turbulence drag

Numerical simulation of the vertical migration of Microcystis (cyanobacteria) colonies based on turbulence drag

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

Functional analysis of Microcystis vertical migration: a dynamic model as a prospecting tool. II. Influence of mixing, thermal stratification and colony diameter on biomass production

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