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| Titel |
Summer microplankton community structure across the Scotia Sea: implications for biological carbon export |
| VerfasserIn |
R. E. Korb, M. J. Whitehouse, M. Gordon, P. Ward, A. J. Poulton |
| 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. 1 ; Nr. 7, no. 1 (2010-01-28), S.343-356 |
| Datensatznummer |
250004386
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| Publikation (Nr.) |
 copernicus.org/bg-7-343-2010.pdf |
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| Zusammenfassung |
| During the austral summer of 2008, we carried out a high resolution survey
of the microplankton communities along a south to north transect covering a
range of environments across the Scotia Sea, Southern Ocean; high and low
productivity, sea-ice to open water conditions, and over a number of
oceanographic fronts and bathymetric features. Cluster analysis revealed
five distinct communities that were geographically constrained by physical
features of bathymetry and fronts. From south to north the communities were:
(1) the South Orkney group, a mixed community of naked dinoflagellates and
heavily silicified diatoms, (2) southern Scotia Sea, a mixed community of
cyptophytes and naked dinoflagellates, (3) central Scotia Sea, dominated by
naked dinoflagellates, (4) southwest of the island of South Georgia, lightly
silicified diatoms and naked dinoflagellates (5) northwest of South Georgia,
dominated by diatoms. Data from a previous summer cruise (2003) to the
Scotia Sea followed a similar pattern of community distribution. MODIS
images, Chlorophyll a and macronutrient deficits revealed dense
phytoplankton blooms occurred around the island of South Georgia, were
absent near the ice edge and in the central Scotia Sea and were moderate in
the southern Scotia Sea. Using these environmental factors, together with
community composition, we propose that south of the Southern Antarctic
Circumpolar Current Front, biogenic silica is preferentially exported and
north of the front, in the vicinity of South Georgia, carbon is exported to
depth. |
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