The ammonia-oxidizing nitrifying population of the River Elbe estuary

Stehr, G.

doi:10.1016/0168-6496(95)00022-3

Cited by 91 publications

(122 citation statements)

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“…The ratio of AOA to AOB was larger than 1 at about 75% of the sites, and the greatest value of this ratio was primarily observed in the Hengshui and Xingtai reaches. In the natural environment, AOA are generally more abundant than AOB (Wessén et al, 2011;Leininger et al, 2006;Wu et al, 2010), and the abundance of AOA (Mincer et al, 2007) and AOB (Stehr et al, 1995) in the water column is commonly in the range of 10 2 to 10 5 gene copies/mL, which is consistent with the results of the present study.…”

Section: Physicochemical Characteristicssupporting

confidence: 92%

Limitation of spatial distribution of ammonia-oxidizing microorganisms in the Haihe River, China, by heavy metals

Chao

Shan

Zhang

et al. 2014

Journal of Environmental Sciences

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a b s t r a c tThe Haihe River is characterized by high ammonia pollution. Therefore, it is necessary to determine how environmental factors, such as heavy metals in the river limit the spatial distribution of ammonia-oxidizing microorganisms. In this study, the relationships between five heavy metals and ammonia-oxidizing microorganisms were studied. The results showed that under high ammonia, low oxygen and high concentrations of suspended particles, ammonia-oxidizing bacteria (AOB) ranged from 10 1.3 to 10 4.8 gene copies/mL and ammonia-oxidizing archaea (AOA) ranged from 10 2.7 to 10 4.9 gene copies/mL. The average metal concentrations in water were 23.57 (Cr), 21.58 (Ni), 65.09 (Cu), 622.03 (Zn) and 10.16 (As) μg/L, with those of Zn, Cu and Cr being higher than the US EPA criteria. Scatter plots of microbial abundance and metals indicated that both AOA and AOB were limited by heavy metals, but in different ways. As had an inhibitory effect on AOB, while Ni and Zn promoted AOA, and the other metals investigated showed no significant correlation with microbial abundance. Overall, our results indicated that the effects of heavy metals on ammonia-oxidizing microorganisms in water are complex, and that the final effect is determined by the physiological role of each element in the microorganisms, as well as environmental conditions such as complexation of organic matter, not simply the total metal concentration.

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Section: Physicochemical Characteristicssupporting

confidence: 92%

Limitation of spatial distribution of ammonia-oxidizing microorganisms in the Haihe River, China, by heavy metals

Chao

Shan

Zhang

et al. 2014

Journal of Environmental Sciences

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“…Earlier studies have suggested that nitrite (Sahan and Muyzer, 2008) and pH (Nicol et al, 2008) may be determining factors in the niche differentiation between AOA and AOB, whereas salinity and hydrological factors have been suggested to have an influence on the structure and dominance of AOA or AOB communities (Stehr et al, 1995;Cebron et al, 2003;Francis et al, 2003;Bernhard et al, 2005;Dang et al, 2008;Mosier and Francis, 2008). This suggests that there are likely to be a number of potentially confounding environmental factors shaping ammonia oxidising communities in estuarine sediments.…”

Section: Discussionmentioning

confidence: 99%

Archaeal ammonia oxidizers and nirS-type denitrifiers dominate sediment nitrifying and denitrifying populations in a subtropical macrotidal estuary

et al. 2009

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Nitrification and denitrification are key steps in nitrogen (N) cycling. The coupling of these processes, which affects the flow of N in ecosystems, requires close interaction of nitrifying and denitrifying microorganisms, both spatially and temporally. The diversity, temporal and spatial variations in the microbial communities affecting these processes was examined, in relation to N cycling, across 12 sites in the Fitzroy river estuary, which is a turbid subtropical estuary in central Queensland. The estuary is a major source of nutrients discharged to the Great Barrier Reef nearshore zone. Measurement of nitrogen fluxes showed an active denitrifying community during all sampling months. Archaeal ammonia monooxygenase (amoA of AOA, functional marker for nitrification) was significantly more abundant than Betaproteobacterial (b-AOB) amoA. Nitrite reductase genes, functional markers for denitrification, were dominated by nirS and not nirK types at all sites during the year. AOA communities were dominated by the soil/sediment cluster of Crenarchaeota, with sequences found in estuarine sediment, marine and terrestrial environments, whereas nirS sequences were significantly more diverse (where operational taxonomic units were defined at both the threshold of 5% and 15% sequence similarity) and were closely related to sequences originating from estuarine sediments. Terminal-restriction fragment length polymorphism (T-RFLP) analysis revealed that AOA population compositions varied spatially along the estuary, whereas nirS populations changed temporally. Statistical analysis of individual T-RF dominance suggested that salinity and C:N were associated with the community succession of AOA, whereas the nirS-type denitrifier communities were related to salinity and chlorophyll-a in the Fitzroy river estuary.

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“…Studies from a variety of habitats document that AOB communities vary over space (Kowalchuk and Stephen, 2001) and that this variation is correlated with a variety of factors, including salinity (Stehr et al, 1995;Sahan and Muyzer, 2008), temperature (Avrahami and Conrad, 2005;Fierer et al, 2009), nutrients (Webster et al, 2002;Mosier and Francis, 2008), plant composition (Briones et al, 2002;Mintie et al, 2003;Dollhopf et al, 2005), soil moisture (Hastings et al, 2000) and pH (Kowalchuk et al, 2000;Nicol et al, 2008). Field experiments confirm that pH (Stephen et al, 1998;Backman et al, 2003) and nitrogen availability (Phillips et al, 2000;Webster et al, 2002) can directly influence AOB composition and/or abundance.…”

Section: Introductionmentioning

confidence: 95%

Nitrogen and phosphorus enrichment alter the composition of ammonia-oxidizing bacteria in salt marsh sediments

et al. 2010

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Ammonia oxidation is a central process in the nitrogen cycle. Particularly in marine and estuarine environments, few experiments have been conducted to tease apart the factors influencing their abundance and composition. To investigate the effect of nitrogen and phosphorus availability on ammonia-oxidizing bacteria (AOB), we conducted a nutrient enrichment experiment in a Maine salt marsh and sampled sediment communities in three seasons over 2 years. We assessed community composition using terminal restriction fragment length polymorphism analysis and sequencing of cloned fragments of the ammonia monooxygenase (amoA) gene. Almost all of the amoA sequences fell within the marine and estuarine-specific Nitrosospira-like clade. Applied separately, nitrogen and phosphorus significantly altered AOB composition; however, together the nutrients had an interactive effect, and composition did not change. In contrast, nutrient enrichment did not alter AOB abundance. Furthermore, the response of AOB composition to nutrient enrichment varied over time. We conclude that closely related taxa within the marine/estuarine-specific Nitrosospira-like clade vary in their preference for nutrient concentrations, and this preference may depend on other temporally variable abiotic factors. Finally, AOB composition was highly variable within and across years even in untreated plots. Further studies are needed to test how these different aspects of compositional variability in AOB communities influence nitrogen cycling.

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The ammonia-oxidizing nitrifying population of the River Elbe estuary

Cited by 91 publications

References 1 publication

Limitation of spatial distribution of ammonia-oxidizing microorganisms in the Haihe River, China, by heavy metals

Limitation of spatial distribution of ammonia-oxidizing microorganisms in the Haihe River, China, by heavy metals

Archaeal ammonia oxidizers and nirS-type denitrifiers dominate sediment nitrifying and denitrifying populations in a subtropical macrotidal estuary

Nitrogen and phosphorus enrichment alter the composition of ammonia-oxidizing bacteria in salt marsh sediments

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