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| Titel |
Upper Arctic Ocean water masses harbor distinct communities of heterotrophic flagellates |
| VerfasserIn |
A. Monier, R. Terrado, M. Thaler, A. Comeau, E. Medrinal, C. Lovejoy |
| 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. 6 ; Nr. 10, no. 6 (2013-06-27), S.4273-4286 |
| Datensatznummer |
250018312
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| Publikation (Nr.) |
 copernicus.org/bg-10-4273-2013.pdf |
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| Zusammenfassung |
| The ubiquity of heterotrophic flagellates (HFL) in marine waters has been
recognized for several decades, but the phylogenetic diversity of these small
(ca. 0.8–20 μm cell diameter), mostly phagotrophic protists in the
upper pelagic zone of the ocean is underappreciated. Community composition of
microbes, including HFL, is the result of past and current environmental
selection, and different taxa may be indicative of food webs that cycle
carbon and energy very differently. While all oceanic water columns can be
density stratified due to the temperature and salinity characteristics of
different water masses, the Arctic Ocean is particularly well stratified,
with nutrients often limiting in surface waters and most photosynthetic
biomass confined to a subsurface chlorophyll maximum layer, where light and
nutrients are both available. This physically well-characterized system
provided an opportunity to explore the community diversity of HFL from
different water masses within the water column. We used high-throughput DNA
sequencing techniques as a rapid means of surveying the diversity of HFL
communities in the southern Beaufort Sea (Canada), targeting the surface, the
subsurface chlorophyll maximum layer (SCM) and just below the SCM. In
addition to identifying major clades and their distribution, we explored the
micro-diversity within the globally significant but uncultivated clade of
marine stramenopiles (MAST-1) to examine the possibility of niche
differentiation within the stratified water column. Our results strongly
suggested that HFL community composition was determined by water mass rather
than geographical location across the Beaufort Sea. Future work should focus
on the biogeochemical and ecological repercussions of different HFL
communities in the face of climate-driven changes to the physical structure
of the Arctic Ocean. |
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