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Microbial functioning and community structure variability in the mesopelagic and epipelagic waters of the subtropical Northeast Atlantic Ocean.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
2012 (Engelska)Ingår i: Applied and Environmental Microbiology, ISSN 0099-2240, E-ISSN 1098-5336, Vol. 78, nr 9, s. 3309-3316Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We analyzed the regional distribution of bulk heterotrophic prokaryotic activity (leucine incorporation) and selected single-cell parameters (cell viability and nucleic acid content) as parameters for microbial functioning, as well as bacterial and archaeal community structure in the epipelagic (0-200 m) and mesopelagic (200-1000 m) subtropical Northeast Atlantic Ocean. We selectively sampled three contrasting regions covering a wide range of surface productivity and oceanographic properties within the same basin: (i) the eddy field south of the Canary Islands, (ii) the open-ocean Subtropical Gyre and (iii) the upwelling filament off Cape Blanc. In the epipelagic waters, a high regional variation in hydrographic parameters and bacterial community structure was detected accompanied, however, by a low variability in microbial functioning. In contrast, mesopelagic microbial functioning was highly variable between the studied regions despite the homogeneous abiotic conditions found therein. More microbial functioning parameters indicated differences among the three regions within the mesopelagic (i.e., viability of cells, nucleic acid content, cell-specific heterotrophic activity, nanoflagellate abundance, prokaryotic to nanoflagellate abundance ratio) than in the epipelagic (i.e., bulk activity, nucleic acid content and nanoflagellate abundance) waters. Our results show that the mesopelagic realm in the NE Atlantic is, in terms of microbial activity, more heterogeneous than its epipelagic counterpart, probably linked to mesoscale hydrographical variations.

Ort, förlag, år, upplaga, sidor
2012. Vol. 78, nr 9, s. 3309-3316
Nationell ämneskategori
Ekologi
Forskningsämne
Naturvetenskap, Akvatisk ekologi
Identifikatorer
URN: urn:nbn:se:lnu:diva-18270DOI: 10.1128/AEM.07962-11PubMedID: 22344670Scopus ID: 2-s2.0-84861120101OAI: oai:DiVA.org:lnu-18270DiVA, id: diva2:514575
Tillgänglig från: 2012-04-25 Skapad: 2012-04-10 Senast uppdaterad: 2017-12-07Bibliografiskt granskad

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