scholarly journals Streambed nitrogen cycling beyond the hyporheic zone: Flow controls on horizontal patterns and depth distribution of nitrate and dissolved oxygen in the upwelling groundwater of a lowland river

2013 ◽  
Vol 118 (1) ◽  
pp. 54-67 ◽  
Author(s):  
Stefan Krause ◽  
Christina Tecklenburg ◽  
Matthias Munz ◽  
Emma Naden
Keyword(s):  
Dissolved Oxygen ◽  
Nitrogen Cycling ◽  
Hyporheic Zone ◽  
Depth Distribution ◽  
Lowland River

scholarly journals Longitudinal and seasonal succession of algal periphyton colonization in lowland river (Tundzha River Part of Turkey)

2016 ◽  
Author(s):  
Burak Öterler
Keyword(s):  
Environmental Factors ◽  
Dissolved Oxygen ◽  
Green Algae ◽  
Environmental Variables ◽  
Diversity Index ◽  
Seasonal Succession ◽  
Lowland River ◽  
Blue Green Algae ◽  
Periphytic Algae ◽  
Wiener Diversity Index

The aim of this paper is to determine and compare the environmental factors controlling longitudinal colonisation of periphytic algae in agricultural and urbanization effects of a lowland river, the Tundzha River, located in Turkish Tunca. To investigate the effect of the environmental factors on periphyton colonization at the river, 6 stations were selected and samples were collected between April 2012 and March 2013. Canonical correspondence analyses have been applied to clarify relationships between environmental variables and periphytic algae. During the study, the Shannon-Wiener diversity index (H′) varied from 1.62 to 3.91. The phytoplankton biovolume was positively related to pH, temperature, salinity, chlorophyll- a and nutrients, and was negatively correlated with dissolved oxygen, turbidity, and silicate. Out of the 5 divisions and of 73 identified species of phytoplankton, the diatoms, namely Fragilaria ulna, Cymbella tumida, Cocconeis placentula, Gomphonema acuminatum and Cymbella cystula were found to be dominant. In addition to these species, the biovolumes of filamentous diatom Melosira varians, filamentous blue-green algae Oscillatoria limosa, and placcoderm desmids Cosmarium botrytis were determined to be at high levels during the year. The euglenoid blooms in St.5 showed many times during the study period.

scholarly journals Longitudinal and seasonal succession of algal periphyton colonization in lowland river (Tundzha River Part of Turkey)

2016 ◽  
Author(s):  
Burak Öterler
Keyword(s):  
Environmental Factors ◽  
Dissolved Oxygen ◽  
Green Algae ◽  
Environmental Variables ◽  
Diversity Index ◽  
Seasonal Succession ◽  
Lowland River ◽  
Blue Green Algae ◽  
Periphytic Algae ◽  
Wiener Diversity Index

The aim of this paper is to determine and compare the environmental factors controlling longitudinal colonisation of periphytic algae in agricultural and urbanization effects of a lowland river, the Tundzha River, located in Turkish Tunca. To investigate the effect of the environmental factors on periphyton colonization at the river, 6 stations were selected and samples were collected between April 2012 and March 2013. Canonical correspondence analyses have been applied to clarify relationships between environmental variables and periphytic algae. During the study, the Shannon-Wiener diversity index (H′) varied from 1.62 to 3.91. The phytoplankton biovolume was positively related to pH, temperature, salinity, chlorophyll- a and nutrients, and was negatively correlated with dissolved oxygen, turbidity, and silicate. Out of the 5 divisions and of 73 identified species of phytoplankton, the diatoms, namely Fragilaria ulna, Cymbella tumida, Cocconeis placentula, Gomphonema acuminatum and Cymbella cystula were found to be dominant. In addition to these species, the biovolumes of filamentous diatom Melosira varians, filamentous blue-green algae Oscillatoria limosa, and placcoderm desmids Cosmarium botrytis were determined to be at high levels during the year. The euglenoid blooms in St.5 showed many times during the study period.

scholarly journals Changes in the nitrogen biogeochemical cycle in sediments of an urban river under different dissolved oxygen levels

2018 ◽  
Vol 19 (4) ◽  
pp. 1271-1278 ◽  
Author(s):  
Yaping Zhang ◽  
Xiaohong Ruan ◽  
Wenli Shi
Keyword(s):  
Dissolved Oxygen ◽  
Nitrogen Cycling ◽  
Quantitative Polymerase Chain Reaction ◽  
Nitrogen Transformation ◽  
Urban River ◽  
Ammonia Oxidizing Bacteria ◽  
Urban Rivers ◽  
Ammonium Oxidation ◽  
Microbial Nitrogen ◽  
Concentration Changes

Abstract Urban rivers are considered as a hot spot of microbial nitrogen cycling due to extensive N loading. However, microbial nitrogen transformation dynamics in urban rivers with different dissolved oxygen (DO) conditions are still unclear. This study investigated the effects of DO concentration changes (anaerobic to aerobic) in overlying water on nitrogen-cycling gene abundance in incubation conditions using sediment from a typical urban river in the Yangtze River Delta. Quantitative polymerase chain reaction (qPCR) results revealed that the abundances of the nitrification gene amoA, denitrification gene nirS/K, norB, nosZ, and anammox gene hzo increased by one to two orders of magnitude from anaerobic to aerobic conditions. Ammonia-oxidizing archaea (AOA) predominated the ammonium oxidation microbial populations, about tenfold more than the ammonia-oxidizing bacteria (AOB) populations. Significant correlations were found among the abundances of AOA-amoA, AOB-amoA, nirS, nirK, and hzo genes, implying a close coupling of aerobic ammonium oxidation (AAO), denitrification, and anammox processes at the molecular level. Moreover, the nitrogen transformation rates were calculated using a box model linking the measured dissolved inorganic nitrogen species. The contribution of anammox to N2 production was 85% under saturated treatment, and the AAO rate was significantly positive correlated to the anammox rate. Our results suggested that coupled AAO and anammox might be the dominant pathway for reactive nitrogen removal in urban rivers with elevated DO levels.

scholarly journals Temporal dynamics of nitrogen cycle gene diversity in a hyporheic microbiome

2019 ◽  
Author(s):  
William C. Nelson ◽  
Emily B. Graham ◽  
Alex R. Crump ◽  
Sarah J. Fansler ◽  
Evan V. Arntzen ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Nitrogen Cycle ◽  
Hyporheic Zone ◽  
Environmental Changes ◽  
Temporal Dynamics ◽  
Gene Diversity ◽  
Optimal Growth ◽  
Community Function ◽  
Level Function ◽  
Denitrification Genes

ABSTRACTBiodiversity is thought to prevent decline in community function in response to changing environmental conditions through replacement of organisms with similar functional capacity but different optimal growth characteristics. We examined how this concept translates to the within-gene level by exploring seasonal dynamics of within-gene diversity for genes involved in nitrogen cycling in hyporheic zone communities. Nitrification genes displayed low richness— defined as the number of unique within-gene phylotypes—across seasons. Conversely, denitrification genes varied in both richness and the degree to which phylotypes were recruited or lost. These results demonstrate that there is not a universal mechanism for maintaining community functional potential for nitrogen cycling activities, even across seasonal environmental shifts to which communities would be expected to be well adapted. As such, extreme environmental changes could have very different effects on the stability of the different nitrogen cycle activities. These outcomes suggest a need to modify existing conceptual models that link biodiversity to microbiome function to incorporate within-gene diversity. Specifically, we suggest an expanded conceptualization that (1) recognizes component steps (genes) with low diversity as potential bottlenecks influencing pathway-level function, and (2) includes variation in both the number of entities (e.g. species, phylotypes) that can contribute to a given process and the turnover of those entities in response to shifting conditions. Building these concepts into process-based ecosystem models represents an exciting opportunity to connect within-gene-scale ecological dynamics to ecosystem-scale services.

scholarly journals Wavelet Characteristics of Hydrological and Dissolved Oxygen Time Series in a Lowland River

2016 ◽  
Vol 64 (3) ◽  
pp. 649-669 ◽  
Author(s):  
Agnieszka Rajwa-Kuligiewicz ◽  
Robert J. Bialik ◽  
Paweł M. Rowiński
Keyword(s):  
Time Series ◽  
Dissolved Oxygen ◽  
Lowland River

Dissolved organic matter transformation in the hyporheic zone of a small lowland river

2010 ◽  
Vol 39 (2) ◽  
Author(s):  
Piotr Zieliński ◽  
Elżbieta Jekatierynczuk-Rudczyk
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Hyporheic Zone ◽  
Stream Water ◽  
Small Scale ◽  
Lowland River ◽  
Organic Matter Transformation ◽  
Doc Concentration ◽  
Different Depths ◽  
Study Sites

Dissolved organic matter transformation in the hyporheic zone of a small lowland riverThe objective of this study was to examine dissolved organic carbon (DOC) concentration and specific ultraviolet absorbance (SUVA) changes in porewaters that occur over a small scale (cm) in the hyporheic zone (HZ) of a lowland stream in the Knyszynska Forest in northeast Poland. Hyporheic zone porewaters were sampled at different depths of 10, 30, 50, 70 cm at two study sites with different sediment material. The results showed significant differences in DOC concentrations between the upper and lower stream HZ. The current results indicate that small lowland sediments provide both a source and a sink of DOC for stream water, depending on the river course. The higher DOC level observed in the hyporheic zone suggests that porewater can be an autonomic site of biogeochemical changes of dissolved organic matter, which is very clear in the SUVA fluctuations.

A River's Liver – Microbial Processes within the Hyporheic Zone of a Large Lowland River

2005 ◽  
Vol 76 (2) ◽  
pp. 349-371 ◽  
Author(s):  
Helmut Fischer ◽  
Frank Kloep ◽  
Sabine Wilzcek ◽  
Martin T Pusch
Keyword(s):  
Hyporheic Zone ◽  
Microbial Processes ◽  
Lowland River

Aspects of the hyporheic zone below the terminus of a South Australian arid-zone stream

1993 ◽  
Vol 44 (3) ◽  
pp. 411 ◽  
Author(s):  
MP Cooling ◽  
AJ Boulton
Keyword(s):  
Species Richness ◽  
Dissolved Oxygen ◽  
Residence Time ◽  
Hyporheic Zone ◽  
Arid Zone ◽  
South Australia ◽  
Common Species ◽  
Diel Variation ◽  
Assemblage Composition ◽  
Longitudinal Pattern

Diel variation in physicochemistry and assemblage composition of the hyporheos, below and beyond the terminus of an arid-zone intermittent stream, was studied in Brachina Creek, Flinders Ranges, South Australia. Surface water downwelled at the terminus, and physicochemical conditions in the hyporheic zone at 30 cm resembled those in the stream above. With increasing distance beyond the terminus and presumably greater hyporheic residence time, diel fluctuations in water temperature and dissolved oxygen became dampened, and were absent 80 m beyond the terminus. At least 31 taxa were collected, 19 of which were surface species temporarily occupying the hyporheic zone. These epigean taxa commonly occurred as tiny instars in the hyporheos below the stream in regions of strong downwelling. Further downstream, the hyporheos became dominated by phreatic species (e.g. blind amphipods, syncarids) that are obligate subsurface residents. At the most downstream site, where dissolved oxygen concentrations were lowest and water temperatures highest, species richness was least, although biomass (mainly amphipods) was greatest. There was no diel variation in assemblage composition, species richness, total abundance and biomass, or the abundance of common species at any of the sites below the stream. The longitudinal pattern in the spatial distribution of the hyporheos appeared to be related to stream hydrology (downwelling), bed permeability, and the hyporheic residence time of the water.

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