Aquatic Sciences Meeting, Albuquerque 2001
| SS06 Carbon Fluxes at Ocean and Large Lake Margins (Environmental Connections) |
| Date: Thursday, February 15, 2001, Time: 2:45:00 PM |
| Location: Brazos |
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| Wassmann, P, , Norwegian College of Fishery Research, University of Tromso, Tromso, Norway, paulw@nfh.uit.no |
| Reigstad, M, , Norwegian College of Fishery Research, University of Tromso, Tromso, Norway, maritr@nfh.uit.no |
| Ratkova, T, , P. P. Shirshov Institute of Oceanology, Academy of Sciences of Russia, Moscow, Russian Federation, trat@trat.msk.ru |
| Arashkevich, A, , P. P. Shirshov Institute of Oceanology, Academy of Sciences of Russia, Moscow, Russian Federation, zatsepin@orc.ru |
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| INCREASING ZOOPLANKTON RETENTION EFFICIENCY FROM FJORD HEAD TO SHELF: EFFECT OF OCEANIC-COASTAL COUPLING ON THE VERTICAL CARBON FLUX COMPOSITION |
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| Vertical flux of phytoplankton and faecal pellets as related to the plankton community were studied along a fjord and adjacent shelf in northern Norway. The phytoplankton community was characterised by higher biomass and variability at the fjord head, while the mesozooplankton community showed an opposite trend with highest biomass and variability at the fjord mouth and the shelf. High grazing potential at the fjord mouth and on the shelf resulted in low vertical flux of both faecal pellets and phytoplankton and low seasonal variability in biomass and vertical flux. Vertical flux of both faecal pellet carbon (FPC) and phytoplankton carbon increased towards the fjord head, reaching maximum sedimentation rates at the innermost station (>200 mg C m-2 d-1). The FPC flux comprised mainly larger cylindrical faecal pellets, probably produced by Calanus finmarchicus. Smaller mesozooplankton and krill had probably an impact on the high retention of biogenic matter and the high detritus fraction observed in the fjord mouth and on the shelf. There is a gradient of decreased retention in the coastal zone caused by decreasing oceanic-coastal coupling. |
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