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| Titel |
Short term changes in zooplankton community during the summer-autumn transition in the open NW Mediterranean Sea: species composition, abundance and diversity |
| VerfasserIn |
V. Raybaud, P. Nival, L. Mousseau, A. Gubanova, D. Altukhov, S. Khvorov, F. Ibañez, V. Andersen |
| 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 ; 5, no. 6 ; Nr. 5, no. 6 (2008-12-16), S.1765-1782 |
| Datensatznummer |
250002940
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| Publikation (Nr.) |
 copernicus.org/bg-5-1765-2008.pdf |
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| Zusammenfassung |
| Short term changes in zooplankton community were investigated at a fixed
station in offshore waters of the Ligurian Sea (DYNAPROC 2 cruise,
September–October 2004). Mesozooplankton were sampled with vertical WP-II
hauls (200 μm mesh-size) and large mesozooplankton, macrozooplankton and
micronekton with a BIONESS multinet sampler (500 μm mesh-size). Temporal
variations of total biomass, species composition and abundance of major taxa
were studied. Intrusions of low salinity water masses were observed two times
during the cruise. The first one, which was the most intense, was associated
with changes in zooplankton community composition. Among copepods, the
abundance of Calocalanus, Euchaeta, Heterorhabdus, Mesocalanus,
Nannocalanus, Neocalanus, Pleuromammaand also calanoid copepodites
increased markedly. Among non-copepod taxa, only small ostracods abundance
increased. After this low salinity event, abundance of all taxa nearly
returned to their initial values. The influence of salinity on each
zooplankton taxon was confirmed by a statistical analysis (Perry's method).
The Shannon diversity index, Pielou evenness and species richness were used
to describe temporal variations of large copepod (>500 μm) diversity.
The Shannon index and Pielou evenness decreased at the beginning of the low
salinity water intrusions, but not species richness. We suggest that low
salinity water masses contained its own zooplankton community and passed
through the sampling area, thus causing a replacement of the zooplankton
population. |
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