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| Titel |
Short-term response of the coccolithophore Emiliania huxleyi to an abrupt change in seawater carbon dioxide concentrations |
| VerfasserIn |
J. Barcelos e Ramos, M. N. Müller, 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 ; 7, no. 1 ; Nr. 7, no. 1 (2010-01-13), S.177-186 |
| Datensatznummer |
250004372
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| Publikation (Nr.) |
 copernicus.org/bg-7-177-2010.pdf |
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| Zusammenfassung |
| The response of the coccolithophore Emiliania huxleyi to rising
CO2 concentrations is well documented for acclimated cultures where
cells are exposed to the CO2 treatments for several generations prior
to the experiment. The exact number of generations required for acclimation
to CO2-induced changes in seawater carbonate chemistry, however, is
unknown. Here we show that Emiliania huxleyi's short-term response (26 h) after cultures
(grown at 500 μatm) were abruptly exposed to changed CO2
concentrations (~190, 410, 800 and 1500 μatm) is similar to that
obtained with acclimated cultures under comparable conditions in earlier
studies. Most importantly, from the lower CO2 levels (190 and 410 μatm) to
750 and 1500 μatm calcification decreased and organic carbon
fixation increased within the first 8 to 14 h after exposing the cultures to
changes in carbonate chemistry. This suggests that Emiliania huxleyi rapidly alters the rates
of essential metabolical processes in response to changes in seawater
carbonate chemistry, establishing a new physiological "state"
(acclimation) within a matter of hours. If this relatively rapid response
applies to other phytoplankton species, it may simplify interpretation of
studies with natural communities (e.g. mesocosm studies and ship-board
incubations), where often it is not feasible to allow for a pre-conditioning
phase before starting experimental incubations. |
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