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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Biochemical composition of particles shape particle-attached bacterial community structure in a high Arctic fjord  [2019]

Jain, Anand; Padinchati Krishnan, Kottekkatu; Singh, Archana; Anna Thomas, Femi; et al.

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Kongsfjorden, a high Arctic fjord was used as a model site to test the hypothesis that source and biochemical composition of particulate organic matter (POM) exert strong selective pressure on particle-attached bacterial community than their free-living counter parts. For this subsurface water samples were collected along the particle density gradient in Kongfjorden. Microbial communities were size fractionated into free-living (FL, 0.2-3 μm) and particle-attached (PA, > 3μm), and V3-V4 16S rRNA gene amplicon sequencing was used for evaluating bacterial community composition. Further, elemental (C/N), isotopic (δ13C) and biochemical composition (carbohydrates, proteins and lipids) of POM were also determined. Clear niche segregation among PA and FL communities was observed, except at a location close to Open Ocean. Higher alpha diversity was recorded in majority of the PA communities as compared to the FL. δ13C (‰) and particulate-carbohydrate (P-CHO) content of POM strongly influence PA bacterial community composition, which was composed primarily of complex biopolymers/carbohydrates degrading bacterial taxa, in particular members of phyla Verrucomicrobia and Bacteroidetes. In addition, glacial meltwater influx and particulate organic carbon (POC) influence FL bacterial community structure. Thus, it appears that particles act as direct substrates for bacterial utilization and select particle-attached bacterial community with specific structure and functio
n while dissolved organic carbon (DOC) plume around the particles select for some specialized free-living bacteria. Further, our results suggest that PA bacterial community can act as ecological indicator for the availability and turnover of complex polymeric substrates in high Arctic fjord environment.
From the journal
Ecological indicators
ISSN : 1470-160X

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2019
Publisher:
Elsevier Ltd
All titles:
"Biochemical composition of particles shape particle-attached bacterial community structure in a high Arctic fjord"@eng
Other:
"Pre-press version"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2019
Publisher:
Elsevier Ltd
All titles:
"Biochemical composition of particles shape particle-attached bacterial community structure in a high Arctic fjord"@eng
Other:
"Pre-press version"