Dissimilatory Nitrate Reduction to Ammonium in the Yellow River Estuary: Rates, Abundance, and Community Diversity
Autor: | Baoyu Gao, Hafiz Adeel Ahmad, Shou-Qing Ni, Cuina Bu, Yu Wang, Cheng-Hao Ge |
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Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
0301 basic medicine
Science 010501 environmental sciences 01 natural sciences Article 03 medical and health sciences chemistry.chemical_compound Nitrate Abundance (ecology) Saltwater intrusion 0105 earth and related environmental sciences geography Multidisciplinary geography.geographical_feature_category Ecology Community structure Sediment Estuary Salinity 030104 developmental biology chemistry Microbial population biology Environmental science Medicine |
Zdroj: | Scientific Reports, Vol 7, Iss 1, Pp 1-11 (2017) Scientific Reports |
ISSN: | 2045-2322 |
Popis: | Dissimilatory nitrate reduction to ammonium (DNRA) is an important nitrate reduction process in estuarine sediments. This study reports the first investigation of DNRA in the Yellow River Estuary located in Eastern Shandong, China. Saltwater intrusion could affect the physicochemical characteristics and change the microbial community structure of sediments. In this study, the activity, abundance and community diversity of DNRA bacteria were investigated during saltwater intrusion. The slurry incubation experiments combined with isotope-tracing techniques and qPCR results showed that DNRA rates and nrfA (the functional gene of DNRA bacteria) gene abundance varied over wide ranges across different sites. DNRA rates had a positive and significant correlation with sediment organic content and extractable NH4+, while DNRA rates were weakly correlated with nrfA gene abundance. In comparison, the activities and abundance of DNRA bacteria did not change with a trend along salinity gradient. Pyrosequencing analysis of nrfA gene indicated that delta-proteobacteria was the most abundant at all sites, while epsilon-proteobacteria was hardly found. This study reveals that variability in the activities and community structure of DNRA bacteria is largely driven by changes in environmental factors and provides new insights into the characteristics of DNRA communities in estuarine ecosystems. |
Databáze: | OpenAIRE |
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