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| Titel |
Seasonal to hour variation scales in abundance and production of total and particle-attached bacteria in the open NW Mediterranean Sea (0–1000 m) |
| VerfasserIn |
G. Mével, M. Vernet, M. Goutx, J. F. Ghiglione |
| 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 (2008-11-20), S.1573-1586 |
| Datensatznummer |
250002924
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| Publikation (Nr.) |
 copernicus.org/bg-5-1573-2008.pdf |
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| Zusammenfassung |
| We present the vertical and temporal dynamics of total vs. particle-attached
bacterial abundance and activity over a 5 week period under summer to autumn
transition in NW Mediterranean Sea. At a weekly time scale, total bacterial
biomass and production in the euphotic layers was significantly correlated
with phytoplanktonic biomass. At an hourly time scale, total bacterial
biomass responded very rapidly to chlorophyll a fluctuations, suggesting a
tight coupling between phytoplankton and bacteria for resource partitioning
during the summer-autumn transition. In contrast, no influence of diel
changes on bacterial parameters was detected. Episodic events such as
coastal water intrusions had a significant positive effect on total
bacterial abundance and production, whereas we could not detect any
influence of short wind events whatever the magnitude. Finally, we show that
particle-attached bacteria can represent a large proportion (up to 49%)
of the total bacterial activity in the euphotic layer but display rapid and
sporadic changes at hourly time scales. In the mesopelagic layers, bacterial
abundance and production linearly decreased with depth, except some
production peaks at 400–750 m. This study underlines the value of large
datasets covering different temporal scales to clarify the biogeochemical
role of bacteria in the cycling of organic matter in open seawater. |
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