NDLI: Influence of freshwater discharge on the microbial degradation processes of dissolved organic nitrogen in a subtropical estuary.

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Influence of freshwater discharge on the microbial degradation processes of dissolved organic nitrogen in a subtropical estuary.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Garcia, Juan C. Ketover, Rheannon D. J. Loh, Ai Ning Parsons, Michael L. Urakawa, Hidetoshi
Spatial Coverage	Florida
Description	Author Affiliation: Garcia JC ( Department of Marine and Ecological Sciences, Florida Gulf Coast University, 10501 FGCU Blvd South, Fort Myers, FL, 33965-6565, USA, Juangarcia152@gmail.com.)
Abstract	River bacterioplankton communities, influenced by watershed usage, are responsible for water purification. Bacterioplankton may be critical in the degradation of dissolved organic nitrogen (DON), the major nitrogen pool in the Caloosahatchee River, Florida. We investigated how freshwater discharge influences estuarine bacterioplankton and how the freshwater-originated DON is utilized by estuarine bacterioplankton. Microcosm experiments were conducted during low and high discharge using two upstream freshwater samples: one site primarily influenced by Lake Okeechobee and the other site moderately influenced by an agricultural watershed. These freshwater samples were filtered to eliminate indigenous microbial populations, then mixed with estuarine bacterioplankton. High-throughput sequencing revealed that bacterioplankton differed between low and high discharge and were influenced by salinity. Alphaproteobacteria and Bacteroidetes dominated in low discharge while Bacteroidetes and Cyanobacteria dominated during high discharge. In the microcosm experiment, DON concentration decreased with increasing cell densities, suggesting that the DON was utilized as a carbon and nitrogen source. Band signals in denaturing gradient gel electrophoresis corresponding to Alphaproteobacteria and Actinobacteria decreased while Gammaproteobacteria increased during the 1 month incubation. This data suggests that estuarine bacterioplankton communities are influenced by variations in discharge patterns and use freshwater-originated DON as demonstrated by a shift in community structure.
File Format	HTM / HTML
ISSN	00036072
Issue Number	2
Volume Number	107
e-ISSN	15729699
Journal	Antonie van Leeuwenhoek
Language	English
Publisher	Springer
Publisher Date	2015-02-01
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Microbiology Discipline Immunology Bacteria Classification Metabolism Biota Drug Effects Fresh Water Chemistry Nitrogen Compounds Organic Chemicals Water Microbiology Biotransformation Carbon Dna, Bacterial Genetics Dna, Ribosomal Estuaries Florida Molecular Sequence Data Rna, Ribosomal, 16s Sequence Analysis, Dna Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Microbiology

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Influence of freshwater discharge on the microbial degradation processes of dissolved organic nitrogen in a subtropical estuary

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Influence of freshwater discharge on the microbial degradation processes of dissolved organic nitrogen in a subtropical estuary.

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Influence of freshwater discharge on the microbial degradation processes of dissolved organic nitrogen in a subtropical estuary

Can the freshwater bacterial communities shift to the 'marine-like' taxa?

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