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Thematische Bibliographien / River metabolism / Zeitschriftenartikel

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Zeitschriftenartikel zum Thema „River metabolism“

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Veröffentlicht am 25. Mai 2024

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1

Yates, Adam G., Robert B. Brua, Joseph M. Culp, Roger G. Young und Patricia A. Chambers. „Variation in stream metabolism and benthic invertebrate composition along longitudinal profiles of two contrasting river systems“. Canadian Journal of Fisheries and Aquatic Sciences 75, Nr. 4 (April 2018): 549–59. http://dx.doi.org/10.1139/cjfas-2016-0198.

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Our study aimed to determine drivers of longitudinal variation in stream metabolism and benthic macroinvertebrate (BMI) composition and assess concordance of these ecological measures for two Canadian rivers (Rat River and Tobacco Creek). Gross primary production was associated with longitudinal position in both rivers but also with the percentage of the watershed used for agriculture and hydrogeomorphic zone. However, within- and among-zone differences in stream metabolism indicated that longitudinal variation followed a staircase pattern rather than a clinal pattern. BMI composition was associated with network position in both rivers, but hydrogeomorphic zones were only important in Tobacco Creek. Among-zone differences in BMI communities in Tobacco Creek depended on season. Concordance between stream metabolism and BMI composition was not observed within either river despite metabolism and BMI composition being associated with longitudinal position. For these rivers, segment-scale hydrogeomorphic conditions appear to be important modifiers of longitudinal patterns observed at the whole river scale. The lack of concordance between stream metabolism and BMI composition suggests reach-scale processes are driving ecological differences within sampling sites.

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2

Ren, Ze, Xiaodong Qu, Wenqi Peng, Yang Yu und Min Zhang. „Functional properties of bacterial communities in water and sediment of the eutrophic river-lake system of Poyang Lake, China“. PeerJ 7 (12.07.2019): e7318. http://dx.doi.org/10.7717/peerj.7318.

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In river-lake systems, sediment and water column are two distinct habitats harboring different bacterial communities which play a crucial role in biogeochemical processes. In this study, we employed Phylogenetic Investigation of Communities by Reconstruction of Unobserved States to assess the potential functions and functional redundancy of the bacterial communities in sediment and water in a eutrophic river-lake ecosystem, Poyang Lake in China. Bacterial communities in sediment and water had distinct potential functions of carbon, nitrogen, and sulfur metabolisms as well as phosphorus cycle, while the differences between rivers and the lake were inconspicuous. Bacterial communities in sediment had a higher relative abundance of genes associated with carbohydrate metabolism, carbon fixation pathways in prokaryotes, methane metabolism, anammox, nitrogen fixation, and dissimilatory sulfate reduction than that of water column. Bacterial communities in water column were higher in lipid metabolism, assimilatory nitrate reduction, dissimilatory nitrate reduction, phosphonate degradation, and assimilatory sulfate reduction than that of sediment bacterial communities. Furthermore, the variations in functional composition were closely associated to the variations in taxonomic composition in both habitats. In general, the bacterial communities in water column had a lower functional redundancy than in sediment. Moreover, comparing to the overall functions, bacterial communities had a lower functional redundancy of nitrogen metabolism and phosphorus cycle in water column and lower functional redundancy of nitrogen metabolism in sediment. Distance-based redundancy analysis and mantel test revealed close correlations between nutrient factors and functional compositions. The results suggested that bacterial communities in this eutrophic river-lake system of Poyang Lake were vulnerable to nutrient perturbations, especially the bacterial communities in water column. The results enriched our understanding of the bacterial communities and major biogeochemical processes in the eutrophic river-lake ecosystems.

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3

Kupilas, Benjamin, Daniel Hering, Armin W. Lorenz, Christoph Knuth und Björn Gücker. „Hydromorphological restoration stimulates river ecosystem metabolism“. Biogeosciences 14, Nr. 7 (12.04.2017): 1989–2002. http://dx.doi.org/10.5194/bg-14-1989-2017.

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Abstract. Both ecosystem structure and functioning determine ecosystem status and are important for the provision of goods and services to society. However, there is a paucity of research that couples functional measures with assessments of ecosystem structure. In mid-sized and large rivers, effects of restoration on key ecosystem processes, such as ecosystem metabolism, have rarely been addressed and remain poorly understood. We compared three reaches of the third-order, gravel-bed river Ruhr in Germany: two reaches restored with moderate (R1) and substantial effort (R2) and one upstream degraded reach (D). Hydromorphology, habitat composition, and hydrodynamics were assessed. We estimated gross primary production (GPP) and ecosystem respiration (ER) using the one-station open-channel diel dissolved oxygen change method over a 50-day period at the end of each reach. Moreover, we estimated metabolic rates of the combined restored reaches (R1 + R2) using the two-station open-channel method. Values for hydromorphological variables increased with restoration intensity (D < R1 < R2). Restored reaches had lower current velocity, higher longitudinal dispersion and larger transient storage zones. However, fractions of median travel time due to transient storage were highest in R1 and lowest in R2, with intermediate values in D. The share of macrophyte cover of total wetted area was highest in R2 and lowest in R1, with intermediate values in D. Station R2 had higher average GPP and ER than R1 and D. The combined restored reaches R1 + R2 also exhibited higher GPP and ER than the degraded upstream river (station D). Restoration increased river autotrophy, as indicated by elevated GPP : ER, and net ecosystem production (NEP) of restored reaches. Temporal patterns of ER closely mirrored those of GPP, pointing to the importance of autochthonous production for ecosystem functioning. In conclusion, high reach-scale restoration effort had considerable effects on river hydrodynamics and ecosystem functioning, which were mainly related to massive stands of macrophytes. High rates of metabolism and the occurrence of dense macrophyte stands may increase the assimilation of dissolved nutrients and the sedimentation of particulate nutrients, thereby positively affecting water quality.

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4

Chowanski, Kurt, Lisa Kunza, Gregory Hoffman, Laurel Genzoli und Emily Stickney. „River management alters ecosystem metabolism in a large oligotrophic river“. Freshwater Science 39, Nr. 3 (01.09.2020): 534–48. http://dx.doi.org/10.1086/710082.

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5

Chen, Yanhua. „River ecosystem metabolism and carbon cycling“. Nature Water 1, Nr. 3 (21.03.2023): 224. http://dx.doi.org/10.1038/s44221-023-00060-1.

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6

Fellows, C. S., M. L. Wos, P. C. Pollard und S. E. Bunn. „Ecosystem metabolism in a dryland river waterhole“. Marine and Freshwater Research 58, Nr. 3 (2007): 250. http://dx.doi.org/10.1071/mf06142.

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Little is known about ecosystem processes in dryland rivers, despite the global distribution of these systems. Those in Australia are characterised by long periods of no flow in which they persist for many months as series of isolated, often turbid, waterholes. We assessed benthic and pelagic primary production, respiration, and bacterial production in one of these waterholes to determine the metabolic balance of the waterhole and resolve the relative importance of autochthonous and allochthonous sources of organic carbon. Despite a photic zone depth of only 0.25 m, three lines of evidence suggested that autochthonous sources of organic carbon were important for fuelling bacterial production under no-flow conditions: the metabolic balance of the waterhole was not indicative of large allochthonous inputs; rates of gross primary production were great enough to meet a substantial fraction of estimated bacterial carbon demand; and pathways for allochthonous carbon to enter the waterhole were limited. These results suggest that models of lake metabolism based on temperate ecosystems can be expanded to include dryland river waterholes, which group with eutrophic lakes owing to their high levels of inorganic nutrients, low allochthonous inputs and autotrophic metabolic balance.

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7

Karaseva, N. P., N. N. Rimskaya-Korsakova, V. N. Kokarev, M. I. Simakov, R. V. Smirnov, M. M. Gantsevich und V. V. Malakhov. „DISCOVERY OF SIBOGLINIDS (ANNELIDA, SIBOGLINIDAE) IN THE ESTUARIES OF THE LARGEST ARCTIC RIVERS ARE ASSOCIATED WITH PERMAFROST GAS HYDRATES“. Доклады Российской академии наук. Науки о жизни 509, Nr. 1 (01.03.2023): 133–36. http://dx.doi.org/10.31857/s2686738922600832.

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In the estuaries of the largest Arctic rivers, namely, the Yenisei, Lena and Mackenzie, marine worms of the family Siboglinidae have been found. Their metabolism is provided by symbiotic chemoautotrophic bacteria. The strong salinity stratification characteristic of the estuaries of the largest Arctic rivers ensures high salinity at depths of 25–36 m, where siboglinids were found. High concentrations of methane necessary for the metabolism of siboglinids arise because of dissociation of permafrost gas hydrates under the influence of river runoff in the conditions of Arctic warming

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8

Rodríguez-Castillo, Tamara, Edurne Estévez, Alexia María González-Ferreras und José Barquín. „Estimating Ecosystem Metabolism to Entire River Networks“. Ecosystems 22, Nr. 4 (22.10.2018): 892–911. http://dx.doi.org/10.1007/s10021-018-0311-8.

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9

Cook, Robert A., Ben Gawne, Rochelle Petrie, Darren S. Baldwin, Gavin N. Rees, Daryl L. Nielsen und Nathan S. P. Ning. „River metabolism and carbon dynamics in response to flooding in a lowland river“. Marine and Freshwater Research 66, Nr. 10 (2015): 919. http://dx.doi.org/10.1071/mf14199.

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Lowland riverine–floodplain systems often have significant but irregular inputs of allochthonous carbon. However, the importance of this carbon to riverine systems remains poorly understood. We assessed open water dissolved organic carbon (DOC) concentrations, metabolism and biofilm stable isotope (δ13C) signatures, upstream and downstream of an extensive floodplain forest on the Murray River, Australia, before and after a flood event. Prior to flooding, all sites had similar concentrations of DOC, rates of metabolism and biofilm δ13C signatures. During the flood DOC concentration increased up to three-fold downstream of the forest, gross primary production (GPP) increased at all sites, but community respiration (CR) increased only at the downstream sites, resulting in decreased in NPP downstream and a slight increase upstream. Biofilm δ13C signatures became depleted by between 4 and 7‰ downstream of the forest during the flood, reflecting a rapid incorporation of allochthonous carbon into the biofilm. These results indicate that flooding led to a substantial increase to the energy budget of the Murray River through the provisioning of large quantities of allochthonous carbon and that terrestrial carbon was processed within the river biofilms. Allochthonous carbon assimilation within biofilms during flooding provides a potential pathway for allochthonous carbon to be incorporated into the metazoan foodweb.

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10

Lipschultz, Fredric, Steven C. Wofsy und Lewis E. Fox. „Nitrogen metabolism of the eutrophic Delaware River ecosystem1“. Limnology and Oceanography 31, Nr. 4 (Juli 1986): 701–16. http://dx.doi.org/10.4319/lo.1986.31.4.0701.

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11

Benner, Ronald, Stephen Opsahl, Gerardo Chin-Leo, Jeffrey E. Richey und Bruce R. Forsberg. „Bacterial carbon metabolism in the Amazon River system“. Limnology and Oceanography 40, Nr. 7 (November 1995): 1262–70. http://dx.doi.org/10.4319/lo.1995.40.7.1262.

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12

Wassenaar, L. I., J. J. Venkiteswaran, S. L. Schiff und G. Koehler. „Aquatic community metabolism response to municipal effluent inputs in rivers quantified using diel δ18O values of dissolved oxygen“. Canadian Journal of Fisheries and Aquatic Sciences 67, Nr. 8 (August 2010): 1232–46. http://dx.doi.org/10.1139/f10-057.

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The spatial footprint over which municipal wastewater effluents cause changes to aquatic community structure and metabolism is key information required for the management of discharges into rivers. Longitudinal studies were undertaken on the Bow and South Saskatchewan rivers, Canada, to assess a new isotopic and modelling approach that combined O2 and δ18O-O2 diel (24 h) response curves to quantify changes in integrated community aquatic metabolism as a result of point-source wastewater inputs. Diel samplings were conducted over four seasons along 50 km transects at Calgary (Bow River) and Saskatoon (South Saskatchewan River). Diel O2 and δ18O-O2 cycles grew in magnitude downstream of effluent inputs in all seasons compared with upstream control sites. δ18O-O2 depletions clearly revealed the stimulating effect of effluent on aquatic photosynthesis. Diel isotopic mass balance modelling showed community metabolic responses to effluent inputs were most pronounced in the spring and summer when photosynthesis and respiration rates were about two- to three-fold higher than at upstream control sites. Our findings revealed that sewage treatment plant nutrient additions resulted in an enhanced metabolic footprint that extended beyond 50 km downstream.

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13

Roos, Jan C., und A. J. H. Pieterse. „Diurnal variations in the vaal, a turbid south african river: primary productivity and community metabolism“. Archiv für Hydrobiologie 124, Nr. 4 (16.06.1992): 459–73. http://dx.doi.org/10.1127/archiv-hydrobiol/124/1992/459.

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14

Brock, J. T., U. Uehlinger und G. W. Minshall. „Periphyton metabolism along a nutrient gradient in a desert river: Truckee River, Nevada, USA“. SIL Proceedings, 1922-2010 24, Nr. 3 (Juni 1991): 1640. http://dx.doi.org/10.1080/03680770.1989.11899041.

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15

Uehlinger, Urs, und James T. Brock. „Periphyton metabolism along a nutrient gradient in a desert river (Truckee River, Nevada, USA)“. Aquatic Sciences 67, Nr. 4 (18.10.2005): 507–16. http://dx.doi.org/10.1007/s00027-005-0788-z.

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16

COLANGELO, DAVID J. „Response of river metabolism to restoration of flow in the Kissimmee River, Florida, U.S.A.“ Freshwater Biology 52, Nr. 3 (März 2007): 459–70. http://dx.doi.org/10.1111/j.1365-2427.2006.01707.x.

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17

Uehlinger, Urs, und James T. Brock. „Periphyton metabolism along a nutrient gradient in a desert river (Truckee River, Nevada, USA)“. Aquatic Sciences 67, Nr. 4 (Dezember 2005): 507–16. http://dx.doi.org/10.1007/bf02507042.

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18

Marescaux, Audrey, Vincent Thieu, Nathalie Gypens, Marie Silvestre und Josette Garnier. „Modeling inorganic carbon dynamics in the Seine River continuum in France“. Hydrology and Earth System Sciences 24, Nr. 5 (11.05.2020): 2379–98. http://dx.doi.org/10.5194/hess-24-2379-2020.

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Abstract. Inland waters are an active component of the carbon cycle where transformations and transports are associated with carbon dioxide (CO2) outgassing. This study estimated CO2 emissions from the human-impacted Seine River (France) and provided a detailed budget of aquatic carbon transfers for organic and inorganic forms, including the in-stream metabolism along the whole Seine River network. The existing process-based biogeochemical pyNuts-Riverstrahler model was supplemented with a newly developed inorganic carbon module and simulations were performed for the recent time period 2010–2013. New input constraints for the modeling of riverine inorganic carbon were documented by field measurements and complemented by analysis of existing databases. The resulting dissolved inorganic carbon (DIC) concentrations in the Seine aquifers ranged from 25 to 92 mg C L−1, while in wastewater treatment plant (WWTP) effluents our DIC measurements averaged 70 mg C L−1. Along the main stem of the Seine River, simulations of DIC, total alkalinity, pH and CO2 concentrations were of the same order of magnitude as the observations, but seasonal variability was not always well reproduced. Our simulations demonstrated the CO2 supersaturation with respect to atmospheric concentrations over the entire Seine River network. The most significant outgassing was in lower-order streams while peaks were simulated downstream of the major WWTP effluent. For the period studied (2010–2013), the annual average of simulated CO2 emissions from the Seine drainage network were estimated at 364±99 Gg C yr−1. Results from metabolism analysis in the Seine hydrographic network highlighted the importance of benthic activities in headwaters while planktonic activities occurred mainly downstream in larger rivers. The net ecosystem productivity remained negative throughout the 4 simulated years and over the entire drainage network, highlighting the heterotrophy of the basin. Highlights CO2 emission from the Seine River was estimated at 364±99 Gg C yr−1 with the Riverstrahler model. CO2 riverine concentrations are modulated by groundwater discharge and instream metabolism. CO2 emissions account for 31 % of inorganic carbon exports, the rest being exported as DIC.

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19

Chaessman, BC. „Estimates of ecosystem metabolism in the La Trobe River, Victoria“. Marine and Freshwater Research 36, Nr. 6 (1985): 873. http://dx.doi.org/10.1071/mf9850873.

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Diel oxygen-curve techniques were used to estimate gross primary productivity (PG), community respiration and net daily metabolism (NDM) for five reaches of the La Trobe River from headwaters to lowlands. All reaches were heterotrophic throughout the study (December 1980-November 1981) with NDM ranging from - 1 to -6 g O2 m-2. PG was consistently very low at the most upstream station and highest in the middle reaches of the river, where both benthic and planktonic contributions were important. At the most downstream station benthic productivity was negligible but planktonic productivity was appreciable in spring and autumn. PG in the river may be limited in the upper reaches by lack of light (due to shading by vegetation) and low levels of nutrients, and in the lower reaches by turbidity and increased depth.

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20

McTammany, M. E., J. R. Webster, E. F. Benfield und M. A. Neatrour. „Longitudinal patterns of metabolism in a southern Appalachian river“. Journal of the North American Benthological Society 22, Nr. 3 (September 2003): 359–70. http://dx.doi.org/10.2307/1468267.

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21

Schechner, Anne E., Walter K. Dodds, Flavia Tromboni, Sudeep Chandra und Alain Maasri. „How do methodological choices influence estimation of river metabolism?“ Limnology and Oceanography: Methods 19, Nr. 9 (12.08.2021): 659–72. http://dx.doi.org/10.1002/lom3.10451.

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22

Brock, James T., und Kenneth W. Cummins. „Ecosystem metabolism in the Kissimmee River, South Florida, USA“. SIL Proceedings, 1922-2010 28, Nr. 2 (Juli 2002): 680–86. http://dx.doi.org/10.1080/03680770.2001.11901800.

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23

Findlay, Stuart, Phillip J. Smith und Judy L. Meyer. „Effect of detritus addition on metabolism of river sediment“. Hydrobiologia 137, Nr. 3 (Juli 1986): 257–63. http://dx.doi.org/10.1007/bf00004239.

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24

Aristi, Ibon, Joanne E. Clapcott, Vicenç Acuña, Arturo Elosegi, Holly Mills, Susanna A. Wood und Roger G. Young. „Forestry affects the abundance of Phormidium-dominated biofilms and the functioning of a New Zealand river ecosystem“. Marine and Freshwater Research 68, Nr. 9 (2017): 1741. http://dx.doi.org/10.1071/mf16208.

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Toxic cyanobacterial proliferations in water bodies can cause serious environmental and public health issues, as well as having economic effects. Increased inputs of nutrients and fine sediment caused by forestry have been hypothesised as possible causes of increased Phormidium-dominated proliferations in New Zealand rivers. Little is known about the effect of these proliferations on river ecosystem functioning. In the present study, we evaluated five sites along the Maitai River (New Zealand) differing in pine plantation cover of their catchments. We hypothesised that Phormidium biofilms would trap more sediments and recycle more phosphorus than diatoms, that Phormidium proliferations would increase with forestry cover in the catchment and that the varying abundance of Phormidium would affect river ecosystem functioning. Phormidium did not trap more sediment or recycle more phosphorus (measured as alkaline phosphate activity) than diatom biofilms. However, the cover of Phormidium did increase with the proportion of forestry in the catchment. Organic matter decomposition rates (measured as loss of tensile strength of standard cotton strips) varied very little among sites, whereas river ecosystem metabolism increased with the abundance of Phormidium, especially in the lower part of the river. The results of the present study suggest that pine forestry does promote Phormidium biofilm abundance and affect ecosystem functioning in the Maitai River.

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25

Val, Jonatan, David Chinarro, María Rosa Pino und Enrique Navarro. „Global change impacts on river ecosystems: A high-resolution watershed study of Ebro river metabolism“. Science of The Total Environment 569-570 (November 2016): 774–83. http://dx.doi.org/10.1016/j.scitotenv.2016.06.098.

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26

McKenzie, D. J., E. Garofalo, M. J. Winter, S. Ceradini, F. Verweij, N. Day, R. Hayes et al. „Complex physiological traits as biomarkers of the sub-lethal toxicological effects of pollutant exposure in fishes“. Philosophical Transactions of the Royal Society B: Biological Sciences 362, Nr. 1487 (02.05.2007): 2043–59. http://dx.doi.org/10.1098/rstb.2007.2100.

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Complex physiological traits, such as routine aerobic metabolic rate or exercise performance, are indicators of the functional integrity of fish that can reveal sub-lethal toxicological effects of aquatic pollutants. These traits have proved valuable in laboratory investigations of the sub-lethal effects of heavy metals, ammonia and various xenobiotics. It is not known, however, whether they can also function as biomarkers of the complex potential range of effects upon overall functional integrity caused by exposure to mixtures of chemicals in polluted natural environments. The current study used portable swimming respirometers to compare exercise performance and respiratory metabolism of fish exposed in cages for three weeks to either clean or polluted sites on three urban European river systems: the river Lambro, Milan, Italy; the rivers Blythe, Cole and Tame, Birmingham, UK; and the river Amstel, Amsterdam, The Netherlands. The UK and Italian rivers were variously polluted with high levels of both bioavailable heavy metals and organics, and the Amstel by mixtures of bioavailable organics at high concentrations. In both the UK and Italy, indigenous chub ( Leuciscus cephalus ) exposed to clean or polluted sites swam equally well in an initial performance test, but the chub from polluted sites could not repeat this performance after a brief recovery interval. These animals were unable to raise the metabolic rate and allocate oxygen towards exercise in the second trial, an effect confirmed in successive campaigns in Italy. Swimming performance was therefore a biomarker indicator of pollutant exposure in chub exposed at these sites. Exposure to polluted sites on the river Amstel did not affect the repeat swimming performance of cultured cloned carp ( Cyprinus carpio ), indicating either a species-specific tolerance or relative absence of heavy metals. However, measurements of oxygen uptake during swimming revealed increased rates of routine aerobic metabolism in both chub and carp at polluted sites in all of the rivers studied, indicating a sub-lethal metabolic loading effect. Therefore, the physiological traits of exercise performance and metabolic rate have potential as biomarkers of the overall sub-lethal toxic effects of exposure to complex mixtures of pollutants in rivers, and may also provide insight into why fish do not colonize some polluted environments.

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Petrova, T. B., und F. A. Bichkaeva. „Comparative analysis of the parameters of carbohydrate exchange and thiamine security in the crew personnel of the northern water basin depending on the speciﬁcs of work, age and professional experience“. Marine Medicine 6, Nr. 4 (11.01.2021): 54–62. http://dx.doi.org/10.22328/2413-5747-2020-6-4-54-62.

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Purpose: assessment of carbohydrate metabolism and thiamine supply in the crew, depending on the speciﬁcs of work, age and professional experience.Materials and methods. The researchers examined the crew personnel of the Northern Water Basin (river workers, ﬁshermen and seafarers) aged from 21 to 59 years, with professional experience up to 35 years. In the blood serum, the parameters of carbohydrate metabolism were determined by the spectrophotometric method, and in the blood hemolysate, by the ﬂuorometric method, the content of the thiamine in the body.Results and its discussion. Seafarers have an increased glucose concentration against the background of low thiamine content relative to ﬁshermen and river workers. The frequency of occurrence of marginal states increases with increasing age and experience in river workers, and the frequency of occurrence of pronounced thiamine-deﬁcient states increases with increasing experience in ﬁshermen. Changes in carbohydrate metabolism and thiamine content of the crew depend mainly on the speciﬁcs of the work.

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Palmer, Margaret, und Albert Ruhi. „Linkages between flow regime, biota, and ecosystem processes: Implications for river restoration“. Science 365, Nr. 6459 (19.09.2019): eaaw2087. http://dx.doi.org/10.1126/science.aaw2087.

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River ecosystems are highly biodiverse, influence global biogeochemical cycles, and provide valued services. However, humans are increasingly degrading fluvial ecosystems by altering their streamflows. Effective river restoration requires advancing our mechanistic understanding of how flow regimes affect biota and ecosystem processes. Here, we review emerging advances in hydroecology relevant to this goal. Spatiotemporal variation in flow exerts direct and indirect control on the composition, structure, and dynamics of communities at local to regional scales. Streamflows also influence ecosystem processes, such as nutrient uptake and transformation, organic matter processing, and ecosystem metabolism. We are deepening our understanding of how biological processes, not just static patterns, affect and are affected by stream ecosystem processes. However, research on this nexus of flow-biota-ecosystem processes is at an early stage. We illustrate this frontier with evidence from highly altered regulated rivers and urban streams. We also identify research challenges that should be prioritized to advance process-based river restoration.

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Tamooh, F., A. V. Borges, F. J. R. Meysman, K. Van Den Meersche, F. Dehairs, R. Merckx und S. Bouillon. „Dynamics of dissolved inorganic carbon and aquatic metabolism in the Tana River basin, Kenya“. Biogeosciences 10, Nr. 11 (04.11.2013): 6911–28. http://dx.doi.org/10.5194/bg-10-6911-2013.

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Abstract. A basin-wide study was conducted in the Tana River basin (Kenya) in February 2008 (dry season), September–November 2009 (wet season) and June–July 2010 (end of the wet season) to assess the dynamics and sources of dissolved inorganic carbon (DIC) as well as to quantify CO2 fluxes, community respiration (R), and primary production (P). Samples were collected along the altitudinal gradient (from 3600 to 8 m) in several headwater streams, reservoirs (Kamburu and Masinga), and the Tana River mainstream. DIC concentrations ranged from 0.2 to 4.8 mmol L−1, with exceptionally high values (3.5 ± 1.6 mmol L−1) in Nyambene Hills tributaries. The wide range of δ13CDIC values (−15.0 to −2.4‰) indicate variable sources of DIC, with headwater streams recording more positive signatures compared to the Tana River mainstream. With with only a few exceptions, the entire riverine network was supersaturated in CO2, implying the system is a net source of CO2 to the atmosphere. pCO2 values were generally higher in the lower Tana River mainstream compared to headwater tributaries, opposite to the pattern typically observed in other river networks. This was attributed to high suspended sediment in the Tana River mainstream fuelling in-stream community respiration and net heterotrophy. This was particularly evident during the 2009 wet season campaign (median pCO2 of 1432 ppm) compared to the 2010 end of the wet season (1002 ppm) and 2008 dry season (579 ppm). First-order estimates show that in-stream community respiration was responsible for the bulk of total CO2 evasion (77 to 114%) in the Tana River mainstream, while in the tributaries, this could only account for 5 to 68% of total CO2 evasion. This suggests that CO2 evasion in the tributaries was to a substantial degree sustained by benthic mineralisation and/or lateral inputs of CO2-oversaturated groundwater. While sediment loads increased downstream and thus light availability decreased in the water column, both chlorophyll a (0.2 to 9.6 μg L−1) and primary production (0.004 to 7.38 μmol C L−1 h−1) increased consistently downstream. Diurnal fluctuations of biogeochemical processes were examined at three different sites along the river continuum (headwater, reservoir and mainstream), and were found to be substantial only in the headwater stream, moderate in the reservoir and not detectable in the Tana River mainstream. The pronounced diurnal fluctuations observed in the headwater stream were largely regulated by periphyton as deduced from the low chlorophyll a in the water column.

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Tamooh, F., A. V. Borges, F. J. R. Meysman, K. Van Den Meersche, F. Dehairs, R. Merckx und S. Bouillon. „Dynamics of dissolved inorganic carbon and aquatic metabolism in the Tana River Basin, Kenya“. Biogeosciences Discussions 10, Nr. 3 (14.03.2013): 5175–221. http://dx.doi.org/10.5194/bgd-10-5175-2013.

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Abstract. A basin-wide study was conducted in the Tana River Basin (Kenya), in February 2008 (dry season), September–November 2009 (wet season), and June–July 2010 (end of the wet season) to assess the dynamics and sources of dissolved inorganic carbon (DIC) as well as to quantify CO2 fluxes, community respiration (R), and primary production (P). Samples were collected along the altitudinal gradient (from 3600 m to 8 m) in several headwater streams, reservoirs (Kamburu and Masinga), and main Tana River. DIC concentrations ranged from 0.2 mmol L–1 to 4.8 mmol L–1 but with exceptionally high values (3.5 ± 1.6 mmol L–1) in Nyambene Hills tributaries. The wide range of δ13CDIC values (−15.0‰ to −2.4‰) indicate variable sources of DIC with headwater streams recording higher signatures compared to main Tana River. With few exceptions, the entire riverine network was supersaturated in CO2, implying the system is a net source of CO2 to the atmosphere. pCO2 values were generally higher in the lower main Tana River compared to headwater tributaries, opposite to the pattern typically observed in other river networks. This was attributed to high suspended sediment in the main Tana River fuelling in-stream community respiration and net heterotrophy. This was particularly evident during 2009 wet season campaign (median pCO2 of 1432 ppm) compared to 2010 end of wet season (1002 ppm) and 2008 dry season (579 ppm). First-order estimates show in-stream community respiration was responsible for the bulk of total CO2 evasion (59% to 89%) in main Tana River while in tributaries respiration accounted for 4% to 52% of total CO2 evasion, suggesting CO2evasion in tributaries was sustained by processes than respiration, such as CO2-oversaturated groundwater input. While sediment loads increase downstream and thus light availability decreases in the water column, both chlorophyll a (0.2 μg L–1 to 9.6 μg L–1) and primary production (0.004 μmol L–1 h–1 to 7.38 μmol L–1 h–1) increased consistently downstream. Diurnal fluctuations of biogeochemical processes were examined at three different sites along the river continuum (headwater, reservoir, and mainstream), and were found to be substantial only in the headwater stream, moderate in the reservoir and not detectable at main Tana River. The pronounced diurnal fluctuations observed in the headwater stream were largely regulated by periphyton as deduced from the low chlorophyll a in the water column.

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Lawrence, J. R., G. Kopf, J. V. Headley und T. R. Neu. „Sorption and metabolism of selected herbicides in river biofilm communities“. Canadian Journal of Microbiology 47, Nr. 7 (01.07.2001): 634–41. http://dx.doi.org/10.1139/w01-061.

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In the present study, biofilms were grown in rotating annular bioreactors with river water as inoculum and sole source of nutrients. The herbicides atrazine and diclofop methyl were applied to the bioreactors, while an identical reactor acted as a control. Biofilm structure was visualized using specific fluorescent probes in conjunction with confocal laser scanning microscopy. The concentration of both herbicides in the bulk water phase followed the pattern of application. Atrazine and metabolites were detected in biofilm samples using direct insertion probe tandem mass spectrometry (DIP-MS/MS) and only trace levels were detected after the addition phase. Monoclonal antibody (MAb) studies indicated that sorption of atrazine was associated with a unique microcolony type. In contrast, diclofop and metabolites reached a maximum level in the biofilm at the end of the addition phase and persisted in the biofilm. Experiments with14C-labeled atrazine and diclofop methyl indicated that mineralization of these compounds to CO2(<1%) occurred in the river biofilms. Thus, both herbicides were sorbed and metabolized by the river biofilm community and detected in biofilms when they were not detected in the bulk water phase. These results indicate that biofilms and specific community members may act as a sink for herbicides, and that this should be taken into account in terms of both sampling and studies of the environmental chemodynamics of contaminants.Key words: biofilm, confocal, image analyses, herbicide, sorption.

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Dodds, Walter K., Allison M. Veach, Claire M. Ruffing, Danelle M. Larson, Jason L. Fischer und Katie H. Costigan. „Abiotic controls and temporal variability of river metabolism: multiyear analyses of Mississippi and Chattahoochee River data“. Freshwater Science 32, Nr. 4 (Dezember 2013): 1073–87. http://dx.doi.org/10.1899/13-018.1.

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OLIVER, RODERICK L., und CHESTER J. MERRICK. „Partitioning of river metabolism identifies phytoplankton as a major contributor in the regulated Murray River (Australia)“. Freshwater Biology 51, Nr. 6 (Juni 2006): 1131–48. http://dx.doi.org/10.1111/j.1365-2427.2006.01562.x.

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Garayburu-Caruso, Vanessa A., Robert E. Danczak, James C. Stegen, Lupita Renteria, Marcy Mccall, Amy E. Goldman, Rosalie K. Chu et al. „Using Community Science to Reveal the Global Chemogeography of River Metabolomes“. Metabolites 10, Nr. 12 (20.12.2020): 518. http://dx.doi.org/10.3390/metabo10120518.

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River corridor metabolomes reflect organic matter (OM) processing that drives aquatic biogeochemical cycles. Recent work highlights the power of ultrahigh-resolution mass spectrometry for understanding metabolome composition and river corridor metabolism. However, there have been no studies on the global chemogeography of surface water and sediment metabolomes using ultrahigh-resolution techniques. Here, we describe a community science effort from the Worldwide Hydrobiogeochemistry Observation Network for Dynamic River Systems (WHONDRS) consortium to characterize global metabolomes in surface water and sediment that span multiple stream orders and biomes. We describe the distribution of key aspects of metabolomes including elemental groups, chemical classes, indices, and inferred biochemical transformations. We show that metabolomes significantly differ across surface water and sediment and that surface water metabolomes are more rich and variable. We also use inferred biochemical transformations to identify core metabolic processes shared among surface water and sediment. Finally, we observe significant spatial variation in sediment metabolites between rivers in the eastern and western portions of the contiguous United States. Our work not only provides a basis for understanding global patterns in river corridor biogeochemical cycles but also demonstrates that community science endeavors can enable global research projects that are unfeasible with traditional research models.

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Liu, Boyi, Mingyang Tian, Kaimin Shih, Chun Ngai Chan, Xiankun Yang und Lishan Ran. „Spatial and temporal variability of <i>p</i>CO<sub>2</sub> and CO<sub>2</sub> emissions from the Dong River in south China“. Biogeosciences 18, Nr. 18 (27.09.2021): 5231–45. http://dx.doi.org/10.5194/bg-18-5231-2021.

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Abstract. CO2 efflux at the water–air interface is an essential component of the riverine carbon cycle. However, the lack of spatially resolved CO2 emission measurements prohibits reliable estimation of the global riverine CO2 emissions. By deploying floating chambers, seasonal changes in river water CO2 partial pressure (pCO2) and CO2 emissions from the Dong River in south China were investigated. Spatial and temporal patterns of pCO2 were mainly affected by terrestrial carbon inputs (i.e., organic and inorganic carbon) and in-stream metabolism, both of which varied due to different land cover, catchment topography, and seasonality of precipitation and temperature. Temperature-normalized gas transfer velocity (k600) in small rivers was 8.29 ± 11.29 and 4.90 ± 3.82 m d−1 for the wet season and dry season, respectively, which was nearly 70 % higher than that of large rivers (3.90 ± 5.55 m d−1 during the wet season and 2.25 ± 1.61 m d−1 during the dry season). A significant correlation was observed between k600 and flow velocity but not wind speed regardless of river size. Most of the surveyed rivers were a net CO2 source while exhibiting substantial seasonal variations. The mean CO2 flux was 300.1 and 264.2 mmol m−2 d−1 during the wet season for large and small rivers, respectively, 2-fold larger than that during the dry season. However, no significant difference in CO2 flux was observed between small and large rivers. The absence of commonly observed higher CO2 fluxes in small rivers could be associated with the depletion effect caused by abundant and consistent precipitation in this subtropical monsoon catchment.

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Genzoli, Laurel, und Robert O. Hall. „Shifts in Klamath River metabolism following a reservoir cyanobacterial bloom“. Freshwater Science 35, Nr. 3 (September 2016): 795–809. http://dx.doi.org/10.1086/687752.

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EDWARDS, R. T., und J. L. MEYER. „Metabolism of a sub-tropical low gradient black water river“. Freshwater Biology 17, Nr. 2 (April 1987): 251–63. http://dx.doi.org/10.1111/j.1365-2427.1987.tb01046.x.

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BERGER, BARBARA, BIRGIT HOCH, GERHARD KAVKA und GERHARD J. HERNDL. „Bacterial metabolism in the River Danube: parameters influencing bacterial production“. Freshwater Biology 34, Nr. 3 (Dezember 1995): 601–16. http://dx.doi.org/10.1111/j.1365-2427.1995.tb00916.x.

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Battin, Tom J., Ronny Lauerwald, Emily S. Bernhardt, Enrico Bertuzzo, Lluís Gómez Gener, Robert O. Hall, Erin R. Hotchkiss et al. „River ecosystem metabolism and carbon biogeochemistry in a changing world“. Nature 613, Nr. 7944 (18.01.2023): 449–59. http://dx.doi.org/10.1038/s41586-022-05500-8.

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Li, Jinbiao, Yangni Zhai, Guojian Ge, Yang Xu, Can Wang, Anyong Hu, Yujie Han et al. „Bacterial Community Composition and Function of Tropical River Ecosystem along the Nandu River on Hainan Island, China“. International Journal of Environmental Research and Public Health 20, Nr. 1 (26.12.2022): 382. http://dx.doi.org/10.3390/ijerph20010382.

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Microorganisms play a pivotal role in nutrient cycling in aquatic ecosystems. Understanding bacterial diversity and its functional composition are crucial for aquatic ecology and protection. We investigated the bacterial community structure using 16S rRNA gene amplicons high-throughput sequencing in this study. Results showed that 105 amplicon sequence variants (ASVs) account for 43.8% of the total sequences shared by the Nandu River’s lower, middle, and upper reach and the Songtao Reservoir. The dominant bacterial phylum in the Nandu River and its connected Songtao Reservoir were Proteobacteria and Actinobacteriota, respectively. The highest Chao1 and Shannon index values were found in the lower reach of the Nandu River. Beta diversity analysis showed the divergence in bacterial communities in the Nandu River and Songtao Reservoir, but not in different reaches. Among the water properties, based on the Mantel test, dissolved oxygen, total nitrogen, and nitrite significantly affected the bacterial communities. The functional profiles predicted by Tax4Fun2 showed that metabolism was the most abundant function group. The relative abundance of genetic information processing was significantly higher in the Songtao Reservoir than in the Nandu River, while the relative abundance of human diseases was significantly lower in the Songtao Reservoir than in the Nandu River. The appearance of the xenobiotics biodegradation and metabolism function group requires us to pay more attention to possible water pollution, especially at the upper reach of the Nandu River.

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Huang, Jian Jun, Yu Hong Li und Ya Jie Gao. „Ferric Nitrate Suppresses Internal Phosphorus Loading in Municipal River“. Advanced Materials Research 393-395 (November 2011): 1242–46. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.1242.

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The application of nitrate is an accepted procedure to manage eutrophication municipal rivers by controlling the phosphorus release from sediments into overlying water and offering electron acceptor for microorganism metabolism. In situ laboratory studies were carried out in simulated reactors to evaluate the potential of ferric nitrate for remediation municipal river sediment. Ferric nitrate could greatly improve the ability of bio-treatment properties for sediment. Two dose remediation experiment of ferric nitrate (70g and 35g per square meter) was carried out lasting 28 weeks. Observations showed that ferric nitrate could suppressed the release of phosphorus from the sediments. At the same time the TN concentration could reduce to common level compared to blank reactor by denitrification. As a whole the dose of 35g per square meter ferric nitrate is better. The results suggest that knowledge of a municipal river’s nitrogen budget may be a useful tool in the design of municipal river remediation efforts.

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Vink, S., M. Bormans, P. W. Ford und N. J. Grigg. „Quantifying ecosystem metabolism in the middle reaches of Murrumbidgee River during irrigation flow releases“. Marine and Freshwater Research 56, Nr. 2 (2005): 227. http://dx.doi.org/10.1071/mf04187.

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The relative importance of floodplain carbon inputs and in-stream metabolic processes have not been well quantified in major Australian rivers. We quantified seasonal phytoplankton primary production and net ecosystem production during irrigation flow regimes at four sites each located ~100 km apart in the middle Murrumbidgee River. During flow periods dominated by storage release, ecosystem gross primary productivity, system respiration and phytoplankton chlorophyll concentrations all increased downstream so that overall net ecosystem metabolism was strongly net heterotrophic upstream and closer to balanced downstream. Phytoplankton production dominated ecosystem production throughout the entire reach and was likely to have been phosphorus limited throughout the study. Additionally, phytoplankton biomass was limited by short residence times at the upstream sites and nitrogen limited downstream in summer, despite an increase in turbidity. Both production and respiration rates were generally lower in winter, as expected, owing to lower temperatures.

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Saup, Casey M., Kenneth H. Williams, Lucía Rodríguez-Freire, José M. Cerrato, Michael D. Johnston und Michael J. Wilkins. „Anoxia stimulates microbially catalyzed metal release from Animas River sediments“. Environmental Science: Processes & Impacts 19, Nr. 4 (2017): 578–85. http://dx.doi.org/10.1039/c7em00036g.

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Pino-Otín, María Rosa, Guillermo Lorca, Elisa Langa, Francisco Roig, Eva M. Terrado und Diego Ballestero. „Assessing the Ecotoxicity of Eight Widely Used Antibiotics on River Microbial Communities“. International Journal of Molecular Sciences 24, Nr. 23 (30.11.2023): 16960. http://dx.doi.org/10.3390/ijms242316960.

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Global prevalence of antibiotic residues (ABX) in rivers requires ecotoxicological impact assessment. River microbial communities serve as effective bioindicators for this purpose. We quantified the effects of eight commonly used ABXs on a freshwater river microbial community using Biolog EcoPlates™, enabling the assessment of growth and physiological profile changes. Microbial community characterization involved 16S rRNA gene sequencing. The river community structure was representative of aquatic ecosystems, with the prevalence of Cyanobacteria, Proteobacteria, Actinobacteria, and Bacteroidetes. Our findings reveal that all ABXs at 100 µg/mL reduced microbial community growth and metabolic capacity, particularly for polymers, carbohydrates, carboxylic, and ketonic acids. Chloramphenicol, erythromycin, and gentamicin exhibited the highest toxicity, with chloramphenicol notably impairing the metabolism of all studied metabolite groups. At lower concentrations (1 µg/mL), some ABXs slightly enhanced growth and the capacity to metabolize substrates, such as carbohydrates, carboxylic, and ketonic acids, and amines, except for amoxicillin, which decreased the metabolic capacity across all metabolites. We explored potential correlations between physicochemical parameters and drug mechanisms to understand drug bioavailability. Acute toxicity effects at the river-detected low concentrations (ng/L) are unlikely. However, they may disrupt microbial communities in aquatic ecosystems. The utilization of a wide array of genetically characterized microbial communities, as opposed to a single species, enables a better understanding of the impact of ABXs on complex river ecosystems.

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Halliday, S. J., R. A. Skeffington, A. J. Wade, M. J. Bowes, D. S. Read, H. P. Jarvie und M. Loewenthal. „Riparian shading controls instream spring phytoplankton and benthic algal growth“. Environmental Science: Processes & Impacts 18, Nr. 6 (2016): 677–89. http://dx.doi.org/10.1039/c6em00179c.

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Wang, Longfei, Yutao Wang, Yi Li, Wenlong Zhang, Huanjun Zhang, Lihua Niu und Nuzahat Habibul. „Benthic Biofilm Bacterial Communities and Their Linkage with Water-Soluble Organic Matter in Effluent Receivers“. International Journal of Environmental Research and Public Health 19, Nr. 4 (10.02.2022): 1994. http://dx.doi.org/10.3390/ijerph19041994.

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Benthic biofilms are pioneering microbial aggregates responding to effluent discharge from wastewater treatment plants (WWTPs). However, knowledge of the characteristics and linkage of bacterial communities and water-soluble organic matter (WSOM) of benthic biofilms in effluent-receiving rivers remains unknown. Here, we investigated the quality of WSOM and the evolution of bacterial communities in benthic biofilm to evaluate the ecological impacts of effluent discharge on a representative receiving water. Tryptophan-like proteins showed an increased proportion in biofilms collected from the discharge area and downstream from the WWTP, especially in summer. Biofilm WSOM showed weak humic character and strong autochthonous components, and species turnover was proven to be the main factor governing biofilm bacteria community diversity patterns. The bacterial community alpha diversity, interspecies interaction, biological index, and humification index were signally altered in the biofilms from the discharge area, while the values were more similar in biofilms collected upstream and downstream from the WWTP, indicating that both biofilm bacterial communities and WSOM characters have resilience capacities. Although effluent discharge simplified the network pattern of the biofilm bacterial community, its metabolic functional abundance was basically stable. The functional abundance of carbohydrate metabolism and amino acid metabolism in the discharge area increased, and the key modules in the non-random co-occurrence network also verified the important ecological role of carbon metabolism in the effluent-receiving river. The study sheds light on how benthic biofilms respond to effluent discharge from both ecological and material points of view, providing new insights on the feasibility of utilizing benthic biofilms as robust indicators reflecting river ecological health.

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Uehlinger, Urs, und Markus W. Naegeli. „Ecosystem Metabolism, Disturbance, and Stability in a Prealpine Gravel Bed River“. Journal of the North American Benthological Society 17, Nr. 2 (Juni 1998): 165–78. http://dx.doi.org/10.2307/1467960.

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Howarth, R. W., R. Schneider und D. Swaney. „Metabolism and Organic Carbon Fluxes in the Tidal Freshwater Hudson River“. Estuaries 19, Nr. 4 (Dezember 1996): 848. http://dx.doi.org/10.2307/1352302.

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Irwin, Craig E., Joseph M. Culp und Adam G. Yates. „Spatio-temporal variation of benthic metabolism in a large, regulated river“. Canadian Water Resources Journal / Revue canadienne des ressources hydriques 45, Nr. 2 (07.02.2020): 144–57. http://dx.doi.org/10.1080/07011784.2020.1724198.

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Alderman, D. W. M., B. R. Balsis, I. D. Buffam, R. H. Garritt, C. S. Hopkinson und J. J. Vallino. „Pelagic Metabolism in the Parker River/Plum Island Sound Estuarine System“. Biological Bulletin 189, Nr. 2 (Oktober 1995): 250–51. http://dx.doi.org/10.1086/bblv189n2p250.

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