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          Institute: MPI für marine Mikrobiologie     Collection: Abteilung Biogeochemie     Display Documents



ID: 13925.0, MPI für marine Mikrobiologie / Abteilung Biogeochemie
Seasonal productivity dynamics in the pelagic central Benguela System inferred from the flux of carbonate and silicate organisms
Authors:Romero, O.; Boeckel, B.; Donner, B.; Lavik, G.; Fischer, G.; Wefer, G.
Language:English
Date of Publication (YYYY-MM-DD):2002-11-29
Title of Journal:Journal of Marine Systems
Journal Abbrev.:J. Mar. Syst.
Volume:37
Issue / Number:4
Start Page:259
End Page:278
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Flux of bulk components, carbonate- and silicate-bearing skeleton organisms, and the delta(15)N-isotopic signal were investigated on a 1-year time-series sediment trap deployed at the pelagic NU mooring site (Namibia Upwelling, ca. 29degreesS, 13degreesE) in the central Benguela System. The flux of bulk components mostly shows bimodal seasonality with major peaks in austral summer and winter, and moderate to low export in austral fall and spring. The calcium carbonate fraction dominates the export of particulates throughout the year, followed by lithogenic and biogenic opal. Planktonic foraminifera and coccolithophorids are major components of the carbonate fraction, while diatoms clearly dominate the biogenic opal fraction. Bulk delta(15)N isotopic composition of particulate matter is positively correlated with the total mass flux during summer and fall, while negatively correlated during winter and spring. Seasonal changes in the intensity of the main oceanographic processes affecting the NU site are inferred from variations in bulk component flux, and in the flux and diversity patterns of individual species or group of species. Influence from the Namaqua (Hondeklip) upwelling cell through offshore migration of chlorophyll filaments is stronger in summer, while the winter flux maximum seems to reflect mainly in situ production, with less influence from the coastal and shelf upwelling areas. On a yearly basis, dominant microorganisms correspond well with the flora and fauna of tropical/subtropical waters, with minor contribution of near- shore organisms. The simultaneous occurrence of species with different ecological affinities mirrors the fact that the mooring site was located in a transitional region with large hydrographic variability over short-time intervals. (C) 2002 Elsevier Science B.V. All rights reserved.
Free Keywords:coccolithophorids; diatoms; foraminifera; particle flux; upwelling; southern Africa; Benguela System
Comment of the Author/Creator:Date: 2002, NOV 29
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für marine Mikrobiologie
External Affiliations:Univ Bremen, Dept Geosci, POB 33 04 40, D-28334 Bremen, Germany; Univ Bremen, Dept Geosci, D-28334 Bremen, Germany; Max Planck Inst Marine Microbiol, D-28359 Bremen, Germany
Identifiers:ISI:000179670400002 [ID No:1]
ISSN:0924-7963 [ID No:2]
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