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Abstract Detail

Environmental Climate Change : The role of marine and aquatic photosynthetic organisms in the global carbon cycle

Young , Erica [1].

Interactions between inorganic carbon acquisition and supply of other nutrients to marine algae in a changing climate.

Phytoplankton carry out and estimated 40% of the photosynthesis on the planet, so play a critical role in a changing global carbon cycle. In considering changes in algal production in response to climate change, interactions between inorganic C acquisition and the availability of other key nutrients are also important. Many phytoplankton species employ active dissolved inorganic carbon (DIC) acquisition mechanisms which improve C fixation efficiency, and help overcome limitations of CO2 supply rate in aquatic environments. The costs of this strategy are energetic requirements for active uptake, as well as production of specific enzymes and transporter proteins involved in DIC uptake. DIC uptake mechanisms are suppressed under elevated CO2, but also modulated by environmental factors including availability of light and other nutrients. Laboratory experiments suggest that nutrient costs of active DIC transport are offset by enhanced nutrient use efficiency. Field experiments suggest that increasing CO2 will alter nutrient stoichiometry and affect biogeochemical cycling. This paper will review the current knowledge on the interactions between nutrient supply and DIC acquisition from laboratory and field experiments, with a focus on iron and macronutrients. Implications of these interactions for biological responses to a changing marine carbonate cycle will be discussed.

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1 - University of Wisconsin_Milwaukee, Department of Biological Sciences, 3209 N Maryland Ave, Milwaukee, WI, 53221, USA

inorganic carbon aquisition
carbon concentrating mechanism

Presentation Type: Symposium or Colloquium Presentation
Session: SY10
Location: Cottonwood B/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 9:30 AM
Number: SY105003
Abstract ID:997