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Steinberg, D. K., Virginia Institute of Marine Science, Gloucester Point, USA, debbies@vims.edu

Sverdrup Award Lecture - LONG-TERM CHANGES IN THE ROLE OF ZOOPLANKTON IN OCEAN BIOGEOCHEMICAL PROCESSES

Zooplankton play an integral role in the cycling of elements in the sea through their grazing and metabolism. Zooplankton time series reflecting climate or other environmentally-influenced changes in zooplankton biomass and community structure can be used to determine associated changes in biogeochemical cycling, and to predict future changes. Analysis of time series from diverse environments, including the Bermuda Atlantic Time-series Study and the Palmer Antarctica Long-Term Ecological Research program, indicates long-term changes in zooplankton export processes, such as fecal pellet production and diel vertical migration. These changes can have significant effects on the magnitude of the biological pump, which regulates in part atmospheric carbon dioxide and hence can impact climate. Changes in zooplankton community structure also affects the quality and quantity of dissolved inorganic and organic matter they produce, which in turn can affect microbial communities. The role of some major taxa (common to both ecosystems is the significance of gelatinous zooplankton– salp blooms, to export), and process rates in major habitats (mesopelagic zone) are still needed to better incorporate the role of zooplankton into predictive biogeochemical models.

Session #:039
Date: 2/23/2012
Time: 10:30
Location: Ballroom B

Presentation is given by student: No