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| Titel |
Ecology of aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea |
| VerfasserIn |
D. Lamy, C. Jeanthon, M. T. Cottrell, D. L. Kirchman, F. Wambeke, J. Ras, O. Dahan, M. Pujo-Pay, L. Oriol, L. Bariat, P. Catala, V. Cornet-Barthaux, P. Lebaron |
| 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 ; 8, no. 4 ; Nr. 8, no. 4 (2011-04-20), S.973-985 |
| Datensatznummer |
250005697
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| Publikation (Nr.) |
 copernicus.org/bg-8-973-2011.pdf |
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| Zusammenfassung |
| Aerobic anoxygenic phototrophic (AAP) bacteria are photoheterotrophic
prokaryotes able to use both light and organic substrates for energy
production. They are widely distributed in coastal and oceanic environments
and may contribute significantly to the carbon cycle in the upper ocean. To
better understand questions regarding links between the ecology of these
photoheterotrophic bacteria and the trophic status of water masses, we
examined their horizontal and vertical distribution and the effects of
nutrient additions on their growth along an oligotrophic gradient in the
Mediterranean Sea. Concentrations of bacteriochlorophyll-a (BChl-a) and AAP
bacterial abundance decreased from the western to the eastern basin of the
Mediterranean Sea and were linked with concentrations of chlorophyll-a,
nutrient and dissolved organic carbon. Inorganic nutrient and glucose
additions to surface seawater samples along the oligotrophic gradient
revealed that AAP bacteria were nitrogen- and carbon-limited in the
ultraoligotrophic eastern basin. The intensity of the AAP bacterial growth
response generally differed from that of the total bacterial growth
response. BChl-a quota of AAP bacterial communities was significantly higher
in the eastern basin than in the western basin, suggesting that reliance on
phototrophy varied along the oligotrophic gradient and that nutrient and/or
carbon limitation favors BChl-a synthesis. |
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