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Study of the nutrient and plankton dynamics in Lake Tanganyika using a reduced-gravity model

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  • Naithani, Jaya
  • Darchambeau, François
  • Deleersnijder, Eric
  • Descy, Jean-Pierre
  • Wolanski, Eric

Abstract

An eco-hydrodynamic (ECOH) model is proposed for Lake Tanganyika to study the plankton productivity. The hydrodynamic sub-model solves the non-linear, reduced-gravity equations in which wind is the dominant forcing. The ecological sub-model for the epilimnion comprises nutrients, primary production, phytoplankton biomass and zooplankton biomass. In the absence of significant terrestrial input of nutrients, the nutrient loss is compensated for by seasonal, wind-driven, turbulent entrainment of nutrient-rich hypolimnion water into the epilimnion, which gives rise to high plankton productivity twice in the year, during the transition between two seasons. Model simulations predict well the seasonal contrasts of the measured physical and ecological parameters. Numerical tests indicate that the half saturation constant for grazing by zooplankton and the fish predation rate on zooplankton affect the zooplankton biomass measurably more than that of phytoplankton biomass. This work has implications for the application of this model to predict the climatological biological productivity of Lake Tanganyika.

Suggested Citation

  • Naithani, Jaya & Darchambeau, François & Deleersnijder, Eric & Descy, Jean-Pierre & Wolanski, Eric, 2007. "Study of the nutrient and plankton dynamics in Lake Tanganyika using a reduced-gravity model," Ecological Modelling, Elsevier, vol. 200(1), pages 225-233.
    • Handle: RePEc:eee:ecomod:v:200:y:2007:i:1:p:225-233
    DOI: 10.1016/j.ecolmodel.2006.07.035
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    Cited by:

    1. van Leeuwen, Edwin & Lacerot, Gissell & van Nes, Egbert H. & Hemerik, Lia & Scheffer, Marten, 2007. "Reduced top–down control of phytoplankton in warmer climates can be explained by continuous fish reproduction," Ecological Modelling, Elsevier, vol. 206(1), pages 205-212.
    2. Duquesne, François & Vallaeys, Valentin & Vidaurre, Prem Jai & Hanert, Emmanuel, 2021. "A coupled ecohydrodynamic model to predict algal blooms in Lake Titicaca," Ecological Modelling, Elsevier, vol. 440(C).
    3. Kumar, Vijay & Kumari, Beena, 2015. "Mathematical modelling of the seasonal variability of plankton and forage fish in the Gulf of Kachchh," Ecological Modelling, Elsevier, vol. 313(C), pages 237-250.
    4. Weissenberger, Sebastian & Lucotte, Marc & Houel, Stéphane & Soumis, Nicolas & Duchemin, Éric & Canuel, René, 2010. "Modeling the carbon dynamics of the La Grande hydroelectric complex in northern Quebec," Ecological Modelling, Elsevier, vol. 221(4), pages 610-620.

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