Light Control Of The Productivity Of Aquatic
Ecosystems
Author(s)
A. Cózar
Abstract
The role of nutrients in the control of productivity of aquatic ecosystems has
been deeply studied in the past century. The role of light, however, remains less
well understood despite the fact that light often becomes the main controlling
factor of the aquatic ecosystems. The theoretical bias between nutrient and light
control may have arisen due to the complexity in modelling the light
environment of aquatic ecosystems (e.g., spatial-temporal variability of algal
exposure, competing presence of optically active abiotic components, negative
feedback of algal auto-shading). In the present work, we develop an ecosystem-specific
model to determine the carrying capacity of algae from the light-biomass
conversion efficiency. The feasibility of this method was demonstrated on two
diverse ecosystems, the phytoplankton community of the Lake Victoria (East
Africa) and the microphytobenthos community of the lacustrine system of the
Ibera wetlands (South America). The relationship between maximum
supportable algal biomass and light availability, mixing depth and background
light attenuation was also determined. Such information has important
implications on the investigation, modelling and management of the aquatic
ecosystems
Keywords: aquatic productivity, photosynthesis, light control, euphotic depth,
Lake Victoria, optical modelling.
Keywords
aquatic productivity, photosynthesis, light control, euphotic depth,
Lake Victoria, optical modelling.
Related Book
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