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| Titel |
Diversity of Arctic pelagic Bacteria with an emphasis on photoheterotrophs: a review |
| VerfasserIn |
D. Boeuf, F. Humily, C. Jeanthon |
| 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 ; 11, no. 12 ; Nr. 11, no. 12 (2014-06-20), S.3309-3322 |
| Datensatznummer |
250117476
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| Publikation (Nr.) |
 copernicus.org/bg-11-3309-2014.pdf |
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| Zusammenfassung |
| The Arctic Ocean is a unique marine environment with respect to seasonality
of light, temperature, perennial ice cover, and strong stratification. Other
important distinctive features are the influence of extensive continental
shelves and its interactions with Atlantic and Pacific water masses and
freshwater from sea ice melt and rivers. These characteristics have major
influence on the biological and biogeochemical processes occurring in this
complex natural system. Heterotrophic bacteria are crucial components of
marine food webs and have key roles in controlling carbon fluxes in the
oceans. Although it was previously thought that these organisms relied on
the organic carbon in seawater for all of their energy needs, several recent
discoveries now suggest that pelagic bacteria can depart from a strictly
heterotrophic lifestyle by obtaining energy through unconventional
mechanisms that are linked to the penetration of sunlight into surface
waters. These photoheterotrophic mechanisms may play a significant role in
the energy budget in the euphotic zone of marine environments. Modifications
of light and carbon availability triggered by climate change may favor the
photoheterotrophic lifestyle. Here we review advances in our knowledge of
the diversity of marine photoheterotrophic bacteria and discuss their
significance in the Arctic Ocean gained in the framework of the Malina
cruise. |
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