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Phytoplankton growth depends not only on the mean intensity but also on the dynamics of the light supply. The nonlinear light-dependency of growth is characterized by a small number of basic parameters: the compensation light intensity PARcompμ, where production and losses are balanced, the growth efficiency at sub-saturating light αµ, and the maxi...
Resource distribution heterogeneity offers niche opportunities for species with different functional traits to develop and potentially coexist. Available light (photosynthetically active radiation or PAR) for suspended algae (phytoplankton) may fluctuate greatly over time and space. Species‐specific light acquisition traits capture important aspect...
Phytoplankton community structure and their abiotic drivers are seldom studied in quarry lakes. We monitored the phytoplankton and physical and chemical conditions of a deep quarry lake for more than a year. The lake was meromictic and phosphorus concentrations remained low year-round. The phytoplankton community was dominated by a small Cosmarium...
Phytoplankton growth depends not only on mean intensity but also on the dynamics of the light supply. In surface mixed layers, phytoplankton may rapidly move between strong light and almost darkness. The nonlinear light-dependency of growth may differ between constant and fluctuating light because of the different frequency distribution of light an...
Influence of hydrophysics on phytoplankton development in Lake TaiHu Mass development of phytoplankton, especially of blue-green algae, impairs the water quality of Lake Taihu. In this nutrient-rich, wind-exposed lake, phytoplankton growth and distribution is often controlled by physical factors like global radiation and intensity of turbulent mixing. Until now, light-dependency of phytoplankton growth is modeled using parameters which were measured under constant light intensities. These parameters are not valid for turbid mixed water bodies like Taihu, where algae experience rapid light fluctuations. This sub-project is aimed to quantify the effects of hydrophysics on phytoplankton development in Lake Taihu. The influence of meteorological conditions on vertical and horizontal distribution of phytoplankton will be analyzed using data from monitoring stations, own surveys and satellite images. Light-dependency of phytoplankton growth will be analyzed in field and in laboratory experiments. Phytoplankton cultures isolated from Taihu will grow under well-controlled lab conditions at fluctuating and at constant light intensities. In the lake, phytoplankton communities will be incubated at constant depths or vertically moved by a computer-controlled lift. The growth rates of main species will be measured at relevant ranges of intensity and dynamics of light. The obtained parameters of the growth-light relation (light intensity at zero growth and at beginning light saturation, growth efficiency at low light, maximum growth rates) at different ranges and frequencies of light fluctuations will be implemented in ecosystem models. These improvements in our knowledge on effects of hydrophysical factors are crucial for better predictions of phytoplankton development under forecasted weather conditions or projected climatic changes.