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Strong Seasonality of Marine Microbial Eukaryotes in a High-Arctic Fjord (Isfjorden, in West Spitsbergen, Norway)
- Source :
- Applied and environmental microbiology. 82(6)
- Publication Year :
- 2015
-
Abstract
- The Adventfjorden time series station (IsA) in Isfjorden, West Spitsbergen, Norway, was sampled frequently from December 2011 to December 2012. The community composition of microbial eukaryotes (size, 0.45 to 10 μm) from a depth of 25 m was determined using 454 sequencing of the 18S V4 region amplified from both DNA and RNA. The compositional changes throughout the year were assessed in relation to in situ fjord environmental conditions. Size fractionation analyses of chlorophyll a showed that the photosynthetic biomass was dominated by small cells (Micromonas ecotype was abundant mostly in the early-bloom and fall periods, whereas heterotrophs, such as marine stramenopiles (MASTs), Picozoa, and the parasitoid marine alveolates (MALVs), displayed higher relative abundance in the winter than in other seasons. Our results emphasize the extreme seasonality of Arctic microbial eukaryotic communities driven by the light regime and nutrient availability but point to the necessity of a thorough knowledge of hydrography for full understanding of their succession and variability.
- Subjects :
- 0301 basic medicine
Chlorophyll a
Aquatic Organisms
Fjord
Ecological succession
Applied Microbiology and Biotechnology
DNA, Ribosomal
Microbial Ecology
Svalbard
03 medical and health sciences
chemistry.chemical_compound
medicine
RNA, Ribosomal, 18S
Micromonas
Biomass (ecology)
geography
geography.geographical_feature_category
Ecology
biology
Arctic Regions
Eukaryota
Sequence Analysis, DNA
Seasonality
biology.organism_classification
medicine.disease
Biota
030104 developmental biology
chemistry
Arctic
Metagenomics
Seasons
Estuaries
Food Science
Biotechnology
Dinophyceae
Subjects
Details
- ISSN :
- 10985336
- Volume :
- 82
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Applied and environmental microbiology
- Accession number :
- edsair.doi.dedup.....eb6b2de6d50c32fea987015e8bc32c8b