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Structure and function of contemporary food webs on Arctic shelves: A panarctic comparison: The pelagic system of the Kara Sea – Communities and components of carbon flow
Authors:HJ Hirche  KN Kosobokova  B Gaye-Haake  I Harms  B Meon  E-M Nthig
Institution:aAlfred Wegener Institute for Polar and Marine Research, Columbusstrasse 1, D-27568 Bremerhaven, Germany;bShirshov Institute of Oceanology, RAS, Moscow, Russia;cCentre for Marine and Climate Research, Institute for Biogeochemistry and Marine Chemistry, Hamburg, Germany;dCentre for Marine and Climate Research, Institute for Oceanography, Hamburg, Germany
Abstract:After a short introduction to the physical setting and the history of biological research the pelagic ecosystem of the Kara Sea is described. Main emphasis is on regional aspects of the plankton communities and their seasonal dynamics using mostly data collected between 1996 and 2001. In the zooplankton, for which most data were available, four regional aggregations were separated: (1) the rivers and estuaries of the Southern Kara Sea, (2) the south-western and (3) the central Kara Sea, and (4) the northern troughs and slope. The phytoplankton communities had a similar distribution. To provide components for detailed carbon budgets the regional dynamics of bacterial, phytoplankton and zooplankton biomass and production are described and carbon requirements of bacteria and zooplankton are estimated. For completeness a short literature review on higher trophic levels is included. Finally, recent observations of the pelago-benthic coupling are considered. Estimates of the carbon requirements from the plankton and benthos reveal a large underestimation of primary production, which to date, together with seasonal aspects, shows the largest gap in our knowledge.
Keywords:Kara Sea  Pelagic ecosystem  Bacteria  Phytoplankton  Zooplankton  Carbon flux
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