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| Titel |
Ultraphytoplankton basin-scale distribution in the eastern Mediterranean Sea in winter: link to hydrodynamism and nutrients |
| VerfasserIn |
M. Denis, M. Thyssen, V. Martin, B. Manca, F. Vidussi |
| 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 ; 7, no. 7 ; Nr. 7, no. 7 (2010-07-20), S.2227-2244 |
| Datensatznummer |
250004901
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| Publikation (Nr.) |
 copernicus.org/bg-7-2227-2010.pdf |
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| Zusammenfassung |
| The basin-scale distribution of ultraphytoplankton (<10 μm) was
determined in the upper 200 m of the eastern Mediterranean Sea during the
winter season. Four clusters were resolved by flow cytometry on the basis of
their optical properties and identified as Synechococcus, Prochlorococcus, pico- (<3 μm) and
nanoeukaryotes (3–10 μm). Synechococcus was the most abundant population (maximum
abundance of about 37 000 cells cm−3) and contributed up to 67.7% to
the overall ultraphytoplanktonic carbon biomass, whereas the contribution of
Prochlorococcus never exceeded 6.5%. The maximum integrated carbon biomass was 1763,
453, 58 and 571 mg C m−2 for nanoeukaryotes, picoeukaryotes,
Prochlorococcus and Synechococcus respectively. Water mass properties were analyzed on the basis of
temperature and salinity distributions in order to account for the general
circulation and locate the main hydrodynamic structures (fronts, gyres,
transition between western and eastern basins). The effect of the main
hydrodynamic structures and nutrients on the ultraphytoplankton distribution
was investigated. No positive correlation between nutrients and
phytoplankton could be established when considering large scales. However,
below 50 m depth, nutrient ratios between particular stations were
correlated to corresponding density ratios. In contrast, significant
relationships were found between Synechococcus abundance and density, resulting from the
impact of a gyre in southern Adriatic basin and a thermohaline front in the
Ionian basin. A significant relationship was also found between
picoeukaryotes and salinity in the comparison of western and eastern
Mediterranean Sea. |
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