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| Titel |
Short-scale temporal variability of physical, biological and biogeochemical processes in the NW Mediterranean Sea: an introduction |
| VerfasserIn |
V. Andersen, M. Goutx, L. Prieur, J. R. Dolan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 3 ; Nr. 6, no. 3 (2009-03-18), S.453-461 |
| Datensatznummer |
250003537
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| Publikation (Nr.) |
 copernicus.org/bg-6-453-2009.pdf |
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| Zusammenfassung |
| In the framework of the PROOF-PECHE project (http://www.obs-vlfr.fr/proof/vt/op/ec/peche/pec.htm) a multi-disciplinary
team performed experiments and collected samples during the DYNAPROC 2 cruise
aboard the RV Thalassa from September to October in 2004. The cruise
provided data on the functioning of the pelagic food web by sampling over a
month long period in the NW Mediterranean Sea at a fixed station subject to
weak horizontal advection currents during a period of hydrological
stability. This paper describes the background of the cruise and provides an
overview of the results derived from the campaign which constitute the
special section. The major objective of the cruise was to assess the
relative importance and variability of the pathways of carbon in the open
ocean. Intensive sampling through 4 periods of 5 days each was accomplished
at a site near the DYFAMED time-series site. The site was near stable in
terms of hydrodynamics as there was some evidence of an intrusion of
low-salinity coastal water. The cruise yielded a comprehensive data set
acquired by sampling over a vertical spatial dimension (0–1000 m) and at
high frequencies (ranging from every 3, 6, 12 and/or 24 h), unique for
the summer to autumn transition in the North Western Mediterranean.
Parameters investigated included the biochemical composition of dissolved
organic matter (lipids), and the structure of bacterial communities,
phytoplankton and zooplankton community compositions and abundances, as well
as zooplankton metabolism, and particulate organic carbon fluxes. Nearly all
the parameters described in this section, as well as reports appearing
elsewhere, showed time-course variabilities of similar magnitude to those
known from a previous study of the spring-summer seasonal transition, a
period of marked hydrological change, at the same study site. Remarkably,
the least variable characteristic of the system appeared to be the
identities of the dominant taxa across several trophic levels (copepods,
phytoplankton, ciliates, and bacteria) throughout the study period despite
large shifts in stock sizes and fluxes. Thus, the studies of DYNAPROC 2
documented considerable temporal variability of stocks and rates in a system
which was, from a hydrological and taxonomic point of view, relatively
stable. |
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