Factors Influencing the Spatial Distribution of Phytoplankton in a Small Productive Lake

George, D. G.; Heaney, S. I.

doi:10.2307/2259185

Cited by 146 publications

(111 citation statements)

References 27 publications

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“…It has long been known that the spatial distribution of phytoplankton species is driven by interactions between physical and biological processes (Fietz et al, 2005;Hillmer et al, 2008) and that wind has an important role in these physical processes (George and Heaney, 1978;Schernewski et al, 2005;Moreno-Ostos et al, 2008;Alexander and Imberger, 2009;Pobel et al, in press). However, all existing knowledge was mainly based on the study of phytoplankton communities living in the well-mixed epilimnetic layer, the spatial distribution of which is affected by direct forcing by the wind.…”

Section: Discussionmentioning

confidence: 99%

Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake

et al. 2010

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The vertical and horizontal distribution of the cyanobacterium, Planktothrix rubescens, was studied in a deep alpine lake (Lac du Bourget) in a 2-year monitoring program with 11 sampling points, and a 24-h survey at one sampling station. This species is known to proliferate in the metalimnic layer of numerous deep mesotrophic lakes in temperate areas, and also to produce hepatotoxins. When looking at the distribution of P. rubescens at the scale of the entire lake, we found large variations (up to 10 m) in the depth of the biomass peak in the water column. These variations were closely correlated to isotherm displacements. We also found significant variations in the distribution of the cyanobacterial biomass in the northern and southern parts of the lake. We used a physical modeling approach to demonstrate that two internal wave modes can explain these variations. Internal waves are generated by wind events, but can still be detected several days after the end of these events. Finally, our 24-h survey at one sampling point demonstrated that the V1H1 sinusoidal motion could evolve into nonlinear fronts. All these findings show that internal waves have a major impact on the distribution of P. rubescens proliferating in the metalimnic layer of a deep lake, and that this process could influence the growth of this species by a direct impact on light availability.

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Section: Discussionmentioning

confidence: 99%

Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake

et al. 2010

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“…The higher Chl-a concentration in the upstream part of the lake can be due to wind transport from downstream, in particular along the sheltered northern shore, where currents from upstream and downstream merge (Figure 5a), advecting phytoplankton from both directions. In this area, the small inflow from two drainage channels (not reproduced in the model) can contribute to the formation of local phytoplankton patches due to additional nutrients discharge [9,19]. Phytoplankton accumulation seems to follow the path of the significant backflow induced by the main gyre.…”

Section: Data and Simulation Analysesmentioning

confidence: 95%

“…According to Verhagen [7], a likely time scale for algal growth and decay is ~10 d. Therefore, having the usual advection time scales in the order of a few hours [8][9][10][11], phytoplankton can be assumed to be passively transported, except for very large shallow lakes. Time scales for phytoplankton horizontal distribution can then be assimilated to the ones of lake circulations.…”

Section: Introductionmentioning

confidence: 99%

Assessing Potential Algal Blooms in a Shallow Fluvial Lake by Combining Hydrodynamic Modelling and Remote-Sensed Images

Pinardi

Fenocchi

Giardino

et al. 2015

Water

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Shallow fluvial lakes are dynamic ecosystems shaped by physical and biological factors and characterized by the coexistence of phytoplankton and macrophytes. Due to multiple interplaying factors, understanding the distribution of phytoplankton in fluvial lakes is a complex but fundamental issue, in the context of increasing eutrophication, climate change, and multiple water uses. We analyze the distribution of phytoplankton by combining remotely sensed maps of chlorophyll-a with a hydrodynamic model in a dammed fluvial lake (Mantua Superior Lake, Northern Italy). The numerical simulation of different conditions shows that the main hydrodynamic effects which influence algal distribution are related to the combined effect of advection due to wind forces and local currents, as well as to the presence of large gyres which induce recirculation and stagnation regions, favoring phytoplankton accumulation. Therefore, the general characters of the phytoplankton horizontal patchiness can be inferred from the results of the hydrodynamic model. Conversely, hyperspectral remote-sensing products can be used to validate this model, as they provide chlorophyll-a distribution maps. The integration of ecological, hydraulic, and remote-sensing techniques may therefore help the monitoring and protection OPEN ACCESSWater 2015, 7 1922of inland water quality, with important improvements in management actions by policy makers.

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“…Both phototaxis (Forward 1976) and geotaxis (Eppley et al 1968, Cullen & Horrigan 1981 have been invoked to explain the directionality of swimming behavior, with a variety of physical and chemical factors regulating the extent of vertical movement. These include nutrients (Eppley et al 1986, Cullen & Horrigan 1981, Heaney & Eppley 1981; light intensity (Harris et al 1979, Heaney & Talling 1980; temperature or salinity gradients (Seliger et al 1970, Kamykowski & Zentara 1977, Tyler & Seliger 1978; and oxygen availability (Heaney 1976, George & Heaney 1978. It is now clear that individual species can respond differently to these parameters (Eppley et al 1968, Heaney & Eppley 1981 Contribution No.…”

Section: Introductionmentioning

confidence: 99%

Selective retention of two dinoflagellates in a well-mixed estuarine embayment: the importance of diel vertical migration and surface avoidance

Anderson¹,

Stolzenbach²

1985

Mar. Ecol. Prog. Ser.

115

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Diel vertical migration patterns of the dinoflagellates Gonyaulax tamarensis and Heterocapsa triquetra were monitored in an estuarine embayment subject to localized blooms of both species. A concurrent study of tidal flushing using a dye tracer demonstrated an efficient, densitydriven mixing process that exchanged water within the embayment at a rate of approximately 0.5 d-'. Loss rates of the whole pond populations of G. tamarensis and H. trjquetra cells were smaller, ranging between 0.02 and 0.13 d-'. The cells were thus able to maintain a non-mixed distribution even under weakly stratified conditions. This selective retention of the 2 species relative to water exchange was due to the differential advection of surface and bottom waters through the inlet channel and the general avoidance of high irradiance surface layers by the dinoflagellates. Both species migrated to irradiances equivalent to 30% of summer sunlight when nutrients were presumably non-limiting, resulting in subsurface aggregations 1 to 2 m deep. Under nutrient-limited conditions, G. tamarensjsmigration was restricted to irradiance at or below 10 to 15% summer sunlight. Planozygotes (a life-cycle stage preceding cyst formation) migrated in a manner indistinguishable from the remainder of the nutrientlimited G. tamarensis population. The results help to explain the dominance of dinoflagellates in such embayments, the localization of their blooms, and the distribution of their resting cysts in the region.

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Factors Influencing the Spatial Distribution of Phytoplankton in a Small Productive Lake

Cited by 146 publications

References 27 publications

Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake

Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake

Assessing Potential Algal Blooms in a Shallow Fluvial Lake by Combining Hydrodynamic Modelling and Remote-Sensed Images

Selective retention of two dinoflagellates in a well-mixed estuarine embayment: the importance of diel vertical migration and surface avoidance

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