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| Titel |
Dissolved and particulate primary production along a longitudinal gradient in the Mediterranean Sea |
| VerfasserIn |
D. C. López-Sandoval, A. Fernández, E. Marañón |
| 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. 3 ; Nr. 8, no. 3 (2011-03-28), S.815-825 |
| Datensatznummer |
250005580
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| Publikation (Nr.) |
 copernicus.org/bg-8-815-2011.pdf |
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| Zusammenfassung |
| We have determined the photosynthetic production of dissolved (DOCp) and
particulate organic carbon (POCp) along a longitudinal transect in the
Mediterranean Sea during the summer stratification period. The euphotic
layer-integrated rates of DOCp and POCp ranged between approximately
50–130 and 95–210 mgC m−2 d−1, respectively, and showed an east to west
increasing trend. For the whole transect, the relative contribution of DOCp
to total, euphotic layer-integrated primary production (percentage of
extracellular release, PER) averaged ~37% and did not show any
clear longitudinal pattern. In spite of the relatively high PER values, the
measured DOCp rates were much lower than the estimated bacterial carbon
demand, suggesting a small degree of coupling between phytoplankton
exudation and bacterial metabolism. Our results, when compared with previous
measurements obtained with the same methods in several ecosystems of
contrasting productivity, support the view that the relative importance of
DOCp increases under strong nutrient limitation. |
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