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| Titel |
Inter-annual fluctuations of zooplankton communities in the Bay of Villefranche-sur-mer from 1995 to 2005 (Northern Ligurian Sea, France) |
| VerfasserIn |
P. Vandromme, L. Stemmann, L. Berline, S. Gasparini, L. Mousseau, F. Prejger, O. Passafiume, J.-M. Guarini, G. Gorsky |
| 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 ; 8, no. 11 ; Nr. 8, no. 11 (2011-11-07), S.3143-3158 |
| Datensatznummer |
250006192
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| Publikation (Nr.) |
 copernicus.org/bg-8-3143-2011.pdf |
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| Zusammenfassung |
| An integrated analysis of the pelagic ecosystems of the Ligurian Sea is
performed combining time series (1995–2005) of several zooplankton groups
(one group for copepods smaller than 0.724 mm3 and nine groups for
individuals larger than 0.724 mm3, i.e. large copepods, decapod
larvæ, other crustaceans, chaetognaths, appendicularians, pteropods,
thaliaceans, gelatinous predators and other zooplankton), chlorophyll-a,
nutrients, salinity, temperature, density, and local weather at Point B
coastal station (Northern Ligurian Sea). From 1995 to 2000 winters were wet
and mild resulting in lower winter sea surface density. These years showed
lower than average nutrients and zooplankton concentrations while
chlorophyll-a biomass was high. After 2000, winters were colder and dryer
resulting in higher sea surface density. Nutrients and zooplankton showed
higher concentrations while chlorophyll-a was lower than average. The
ca. 2000 change was observed for most zooplankton groups with a one-year
delay for some groups. Inter-annual variability within each period was also
observed. The observed patterns suggest that the pelagic ecosystem trophic
state at the studied point is mostly set by the winter forcing on the
vertical mixing that upwells nutrients to the surface sustaining primary
production. Surprisingly, low chlorophyll-a biomass in high nitrate and
zooplankton conditions during the well mixed years suggest that phytoplankton
biomass is controlled by grazers. The proposed mechanisms of stronger winter
vertical mixing hold for most of the time series, but specific years with
contradicting patterns suggest also the possible influence of the summer
climate. A review of recent literature suggests that changes in the pelagic
ecosystem are not limited to the studied site but concern also the central
Ligurian Sea. |
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