Genetic and metabolic diversity of Arctic bacterioplankton during the post-spring phytoplankton bloom in Disko Bay, western Greenland

Frette, Lone; Winding, Anne; Kroer, Niels

doi:10.3354/ame01410

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…Examination of microbial communities in the seawater sources were partly in agreement with results from previous analyses of seawater from the Western Greenland coast, with abundances of Rhodobacteraceae, Colwelliaceae, Oceanospirillaceaeae (Frette et al 2010;Dziallas et al 2013). Also the TRD communities were in agreement with recent data from TRD surface seawater was predominated by Rhodobacteraceae, Synechococcus and non-identified groups, in agreement with data from previous studies (Brakstad et al 2015b).…”

Section: Discussionsupporting

confidence: 82%

Biodegradation of dispersed oil in natural seawaters from Western Greenland and a Norwegian fjord

et al. 2018

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With increasing oil exploration, production and transportation in the Arctic, predictions of the fate of spilled oil become important, including oil compound biodegradation. The use of chemical dispersants may result in increased biodegradation due to the generation of dispersions consisting of small oil droplets, but only few studies have focused on biodegradation of chemically dispersed oil in Arctic seawater. In this study we compared oil biotransformation in Arctic and temperate seawaters collected from Western Greenland (Disko Bay, surface and from 80 m depth) and a Norwegian fjord (Trondheimsfjord, surface). A naphthenic oil, premixed with a dispersant, was dispersed in the seawaters from the different sources, and the dispersions incubated in low concentrations in a carousel system at 4-5 °C for up to 64 days. Targeted oil compounds (n-alkanes, BTEX, naphthalenes and PAHs) were biotransformed in both Arctic and temperate seawaters, although the degradation was faster in the temperate seawater. In the Arctic seawater, transformation was faster in the surface than in the subsurface seawater. Calculations of biotransformation rates and half-lives of oil compound groups representing 70-80% of fresh oils also showed significantly faster depletion in the temperate than the Arctic seawater. Microbial analyses revealed differences between the bacterial communities in the seawater sources during oil biodegradation. The results emphasized, that oil compounds are biodegraded in Arctic seawater, but degradation potential and rates may vary between seawaters from different sources.

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Section: Discussionsupporting

confidence: 82%

Biodegradation of dispersed oil in natural seawaters from Western Greenland and a Norwegian fjord

et al. 2018

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“…Similar to the WML, the deeper layers showed no clear change in community composition within the respective layer. There was no accumulation of cells in deeper layers, as one would expect from a sinking and decaying algae bloom (14,56). Only for the Bacteroidetes could a slightly higher cell abundance be monitored at a depth of 300 m on days Ϫ1 and 36 compared to days 14 and 18 (both IN), as well as day 16 (OUT).…”

Section: Discussionmentioning

confidence: 96%

Microbial Community Response during the Iron Fertilization Experiment LOHAFEX

Thiele

Fuchs

Ramaiah

et al. 2012

Appl Environ Microbiol

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bIron fertilization experiments in high-nutrient, low-chlorophyll areas are known to induce phytoplankton blooms. However, little is known about the response of the microbial community upon iron fertilization. As part of the LOHAFEX experiment in the southern Atlantic Ocean, Bacteria and Archaea were monitored within and outside an induced bloom, dominated by Phaeocystis-like nanoplankton, during the 38 days of the experiment. The microbial production increased 1.6-fold (thymidine uptake) and 2.1-fold (leucine uptake), while total cell numbers increased only slightly over the course of the experiment. 454 tag pyrosequencing of partial 16S rRNA genes and catalyzed reporter deposition fluorescence in situ hybridization (CARD FISH) showed that the composition and abundance of the bacterial and archaeal community in the iron-fertilized water body were remarkably constant without development of typical bloom-related succession patterns. Members of groups usually found in phytoplankton blooms, such as Roseobacter and Gammaproteobacteria, showed no response or only a minor response to the bloom. However, sequence numbers and total cell numbers of the SAR11 and SAR86 clades increased slightly but significantly toward the end of the experiment. It seems that although microbial productivity was enhanced within the fertilized area, a successionlike response of the microbial community upon the algal bloom was averted by highly effective grazing. Only small-celled members like the SAR11 and SAR86 clades could possibly escape the grazing pressure, explaining a net increase of those clades in numbers.

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“…While cosmopolitan species, those found widely distributed in a range of temperate environments, were also isolated including the filamentous fungus Cladosporium cladosporioides and the relatively common Basidiomycete yeast Sporobolomyces sp. (Blanchette et al, 2010; Hughes and Bridge, 2010). …”

Section: Discussionmentioning

confidence: 99%

Recovering Greater Fungal Diversity from Pristine and Diesel Fuel Contaminated Sub-Antarctic Soil Through Cultivation Using Both a High and a Low Nutrient Media Approach

Ferrari¹,

Zhang²,

Dorst³

2011

Front. Microbio.

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Novel cultivation strategies for bacteria are widespread and well described for recovering greater diversity from the “hitherto” unculturable majority. While similar approaches have not yet been demonstrated for fungi it has been suggested that of the 1.5 million estimated species less than 5% have been recovered into pure culture. Fungi are known to be involved in many degradative processes, including the breakdown of petroleum hydrocarbons, and it has been speculated that in Polar Regions they contribute significantly to bioremediation of contaminated soils. Given the biotechnological potential of fungi there is a need to increase efforts for greater species recovery, particularly from extreme environments such as sub-Antarctic Macquarie Island. In this study, like the yet-to-be cultured bacteria, high concentrations of nutrients selected for predominantly different fungal species to that recovered using a low nutrient media. By combining both media approaches to the cultivation of fungi from contaminated and non-contaminated soils, 91 fungal species were recovered, including 63 unidentified species. A preliminary biodegradation activity assay on a selection of isolates found that a high proportion of novel and described fungal species from a range of soil samples were capable of hydrocarbon degradation and should be characterized further.

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Genetic and metabolic diversity of Arctic bacterioplankton during the post-spring phytoplankton bloom in Disko Bay, western Greenland

Cited by 6 publications

References 39 publications

Biodegradation of dispersed oil in natural seawaters from Western Greenland and a Norwegian fjord

Biodegradation of dispersed oil in natural seawaters from Western Greenland and a Norwegian fjord

Microbial Community Response during the Iron Fertilization Experiment LOHAFEX

Recovering Greater Fungal Diversity from Pristine and Diesel Fuel Contaminated Sub-Antarctic Soil Through Cultivation Using Both a High and a Low Nutrient Media Approach

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