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| Titel |
Effect of elevated CO2 on the dynamics of particle-attached and free-living bacterioplankton communities in an Arctic fjord |
| VerfasserIn |
M. Sperling, J. Piontek, G. Gerdts, A. Wichels, H. Schunck, A.-S. Roy, J. Roche, J. Gilbert, J. I. Nissimov, L. Bittner, S. Romac, U. Riebesell, A. Engel |
| 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.181-191 |
| Datensatznummer |
250017466
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| Publikation (Nr.) |
 copernicus.org/bg-10-181-2013.pdf |
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| Zusammenfassung |
| In the frame of the European Project on Ocean Acidification (EPOCA), the
response of an Arctic pelagic community (<3 mm) to a gradient of
seawater pCO2 was investigated. For this purpose 9 large-scale in situ
mesocosms were deployed in Kongsfjorden, Svalbard (78°56.2´ N,
11°53.6´ E), in 2010. The present study investigates effects on
the communities of particle-attached (PA; >3 μm) and free-living (FL; < 3 μm > 0.2 μm) bacteria by
Automated Ribosomal Intergenic Spacer Analysis (ARISA) in 6 of the
mesocosms, ranging from 185 to 1050 μatm initial pCO2, and the
surrounding fjord. ARISA was able to resolve, on average, 27 bacterial
band classes per sample and allowed for a detailed investigation of the
explicit richness and diversity. Both, the PA and the FL bacterioplankton
community exhibited a strong temporal development, which was driven mainly
by temperature and phytoplankton development. In response to the breakdown
of a picophytoplankton bloom, numbers of ARISA band classes in the
PA community were reduced at low and medium CO2 (~ 185–685 μatm) by about 25%, while they were more or less stable at
high CO2 (~ 820–1050 μatm). We hypothesise that
enhanced viral lysis and enhanced availability of organic substrates at high
CO2 resulted in a more diverse PA bacterial community in the post-bloom
phase. Despite lower cell numbers and extracellular enzyme activities in the
post-bloom phase, bacterial protein production was enhanced in high
CO2 mesocosms, suggesting a positive effect of community richness on
this function and on carbon cycling by bacteria. |
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