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| Titel |
Succession of the sea-surface microlayer in the coastal Baltic Sea under natural and experimentally induced low-wind conditions |
| VerfasserIn |
C. Stolle, K. Nagel, M. Labrenz, K. Jürgens |
| 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. 9 ; Nr. 7, no. 9 (2010-09-29), S.2975-2988 |
| Datensatznummer |
250004979
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| Publikation (Nr.) |
 copernicus.org/bg-7-2975-2010.pdf |
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| Zusammenfassung |
| The sea-surface microlayer (SML) is located within the boundary between the
atmosphere and hydrosphere. The high spatial and temporal variability of the
SML's properties, however, have hindered a clear understanding of
interactions between biotic and abiotic parameters at or across the
air-water interface. Among the factors changing the physical and chemical
environment of the SML, wind speed is an important one. In order to examine
the temporal effects of minimized wind influence, SML samples were obtained
from the coastal zone of the southern Baltic Sea and from mesocosm
experiments in a marina to study naturally and artificially calmed sea
surfaces. Organic matter concentrations as well as abundance,
3H-thymidine incorporation, and the community composition of bacteria
in the SML (bacterioneuston) compared to the underlying bulk water (ULW)
were analyzed. In all SML samples, dissolved organic carbon and nitrogen
were only slightly enriched and showed low temporal variability, whereas
particulate organic carbon and nitrogen were generally greatly enriched and
highly variable. This was especially pronounced in a dense surface film
(slick) that developed during calm weather conditions as well as in the
artificially calmed mesocosms. Overall, bacterioneuston abundance and
productivity correlated with changing concentrations of particulate organic
matter. Moreover, changes in the community composition in the field study
were stronger in the particle-attached than in the non-attached
bacterioneuston. This implies that decreasing wind enhances the importance
of particle-attached assemblages and finally induces a succession of the
bacterial community in the SML. Eventually, under very calm meteorological
conditions, there is an uncoupling of the bacterioneuston from the ULW. |
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