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| Titel |
Temporal biomass dynamics of an Arctic plankton bloom in response to increasing levels of atmospheric carbon dioxide |
| VerfasserIn |
K. G. Schulz, R. G. J. Bellerby, C. P. D. Brussaard, J. Büdenbender, J. Czerny, A. Engel, M. Fischer, S. Koch-Klavsen, S. A. Krug, S. Lischka, A. Ludwig, M. Meyerhöfer, G. Nondal, A. Silyakova, A. Stuhr, U. Riebesell |
| 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 ; 10, no. 1 ; Nr. 10, no. 1 (2013-01-11), S.161-180 |
| Datensatznummer |
250017465
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| Publikation (Nr.) |
 copernicus.org/bg-10-161-2013.pdf |
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| Zusammenfassung |
| Ocean acidification and carbonation, driven by anthropogenic emissions of
carbon dioxide (CO2), have been shown to affect a variety of marine
organisms and are likely to change ecosystem functioning. High latitudes,
especially the Arctic, will be the first to encounter profound changes in
carbonate chemistry speciation at a large scale, namely the under-saturation
of surface waters with respect to aragonite, a calcium carbonate polymorph
produced by several organisms in this region. During a CO2 perturbation
study in Kongsfjorden on the west coast of Spitsbergen (Norway), in
the framework of the
EU-funded project EPOCA, the temporal
dynamics of a plankton bloom was followed in nine mesocosms, manipulated for
CO2 levels ranging initially from about 185 to 1420 μatm.
Dissolved inorganic nutrients were added halfway through the experiment.
Autotrophic biomass, as identified by chlorophyll a standing stocks
(Chl a), peaked three times in all mesocosms. However, while absolute
Chl a concentrations were similar in all mesocosms during the first
phase of the experiment, higher autotrophic biomass was measured as high in
comparison to low CO2 during the second phase, right after dissolved
inorganic nutrient addition. This trend then reversed in the third phase.
There were several statistically significant CO2 effects on a variety of
parameters measured in certain phases, such as nutrient utilization, standing
stocks of particulate organic matter, and phytoplankton species composition.
Interestingly, CO2 effects developed slowly but steadily, becoming more
and more statistically significant with time. The observed CO2-related
shifts in nutrient flow into different phytoplankton groups (mainly
dinoflagellates, prasinophytes and haptophytes) could have consequences for
future organic matter flow to higher trophic levels and export production,
with consequences for ecosystem productivity and atmospheric CO2. |
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