Thematische Bibliographien / River metabolism

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Auswahl der wissenschaftlichen Literatur zum Thema „River metabolism“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "River metabolism"

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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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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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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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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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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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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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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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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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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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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Dissertationen zum Thema "River metabolism"

Woodward, Kenneth Benjamin. „The Storage, Mobilisation and Metabolism of Soil Nutrients and Carbon in an Australian Lowland River“. Thesis, Griffith University, 2015. http://hdl.handle.net/10072/366245.

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More than 45 000 dams, with the capacity to hold 15% of global river runoff, have been constructed on rivers around the world for diverse purposes including water supply, irrigation water and power. The effects of these dams on river flow are diverse and dependent upon the purpose of the dam; some dams stabilise flow to improve transportation, water access and agricultural productivity, while dams such as those for power generation create flow regimes that vary drastically over a period of hours. The benefits of regulating river flow for human needs comes with ecological costs to riverine ecosystems including local extinctions, depletion of ground water, declines in water quality and water availability. The specific ecological costs of flow regulation are dependent on how the new, regulated, flow regime differs from the natural flow regime of a river system. Regulation of flow in Australia’s lowland rivers has been undertaken to suppress the inherent flow variability and dampen flow extremes, largely to improve water access for floodplain based irrigated agriculture. Flow regulation in these systems captures moderate sized flows, releasing this stored water during periods of natural low flow. This stabilising of river flow has resulted in an increase in the abundance of introduced species and a decline in the diversity of native fish, macroinvertebrate, and littoral plant communities along with altering river channel geomorphology and decreasing water quality. These declines may be partly caused by the loss of moderate sized flows reducing lateral hydrological connectivity between terrestrial and aquatic ecosystems. In an attempt to reverse this effect, flow rules that are designed to increase the frequency of small to moderate sized flow pulses, which are mostly contained within the channel, have been introduced in many of Australian’s lowland rivers.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text

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Chénier, Martin. „Impact of seasonal variations, nutrients, pollutants and dissolved oxygen on the microbial composition and activity of river biofilms“. Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85144.

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Biofilm communities were cultivated in rotating annular bioreactors using water from the South Saskatchewan River. The impacts of seasonal variations, nutrients, pollutants and dissolved oxygen on the activity and composition of the biofilms were assessed by using a combination of microcosm assays and molecular biology techniques.
The seasonal pattern in nitrification, denitrification and hexadecane mineralization, and in the occurrence of nirK in the South Saskatchewan River biofilms was: fall greater than winter, which was equivalent to spring. Hexadecane mineralization was higher in fall 1999 than in fall 2001, denitrification was similar in these two years, and no seasonal pattern of nitrification was observed.
The addition of combined nutrients (C, N, and P) resulted in significant increases in the measured bacterial activities and in the predominance of alkB, nirS and nirK in all seasons and years. The addition of individual nutrients did not stimulate hexadecane mineralization, denitrification, and the PCR amplification of nirS and nirK. In fall 1999, CNP and, to a lesser extent P, stimulated nitrification, whereas in fall 2001, no pattern was observed. The results showed that nutrients, especially P, were limiting for bacterial activities, and that the biofilm activities and composition varied with nutrient availability and time of year.
At the concentration assessed (1 ppb), hexadecane partially inhibited denitrification to similar extents in both years, had a negative impact on nitrification and hexadecane mineralization in fall 1999, and a positive impact on these two latter activities in fall 2001. Nickel (0.5 mg liter-1 ) negatively affected denitrification but had no effect on hexadecane mineralization. The alkB and nirS genes were less predominant and absent, respectively, in biofilms grown in the presence of nickel. DGGE analyses indicated that nickel reduced the biofilm bacterial diversity.
The results presented herein provide much needed information on the microbial ecology of river biofilms, and on the impact and interactive effects of pollutant and nutrient inputs on these biofilms. These results and the techniques used in this project can be applied to monitor environmental effects of anthropogenic activities on aquatic biofilms, and can contribute to establish or revise environmental regulations.

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Koch, Gregory R. „Dynamics of Ecosystem Metabolism and Flocculent Detritus Transport in Estuarine Taylor River“. FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/680.

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Estuaries and estuarine wetlands are ecologically and societally important systems, exhibiting high rates of primary production that fuel offshore secondary production. Hydrological processes play a central role in shaping estuarine ecosystem structure and function by controlling nutrient loading and the relative contributions of marine and terrestrial influences on the estuary. The Comprehensive Everglades Restoration Plan includes plans to restore freshwater delivery to Taylor Slough, a shallow drainage basin in the southern Everglades, ultimately resulting in increased freshwater flow to the downstream Taylor River estuary. The existing seasonal and inter-annual variability of water flow and source in Taylor River affords the opportunity to investigate relationships between ecosystem function and hydrologic forcing. Estimates of aquatic ecosystem metabolism, derived from free-water, diel changes in dissolved oxygen, were combined with assessments of wetland flocculent detritus quality and transport within the context of seasonal changes in Everglades hydrology. Variation in ecosystem gross primary production and respiration were linked to seasonal changes in estuarine water quality using multiple autoregression models. Furthermore, Taylor River was observed to be net heterotrophic, indicating that an allochthonous source of carbon maintained ecosystem respiration in excess of autochthonous primary production. Wetland-derived detritus appears to be an important vector of energy and nutrients across the Everglades landscape; and in Taylor River, is seasonally flushed into ponded segments of the river where it is then respired. Lastly, seasonal water delivery appears to govern feedbacks regulating water column phosphorus availability in the Taylor River estuary.

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Clinton, Sandra Mae. „Microbial metabolism, enzyme activity and production in the hyporheic zone of a floodplain river /“. Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/5560.

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Kupilas, Benjamin [Verfasser], und Daniel [Akademischer Betreuer] Hering. „Effects of river restoration on ecosystem metabolism and trophic relationships / Benjamin Kupilas ; Betreuer: Daniel Hering“. Duisburg, 2017. http://d-nb.info/1137466634/34.

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Treadwell, Simon Andrew 1968. „Patterns in community metabolism and biomass of biofilms colonising large woody debris along an Australian lowland river“. Monash University, Dept. of Biological Sciences, 2002. http://arrow.monash.edu.au/hdl/1959.1/5605.

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Hamblen, Jennifer M. „Spatial And Temporal Trends In Sediment Dynamics And Potential Aerobic Microbial Metabolism, Upper San Pedro River, Southeastern Arizona“. Thesis, The University of Arizona, 2003. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_etd_hy0216_sip1_w.pdf&type=application/pdf.

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Melo, Michaela Ladeira de. „O papel ecológico das bactérias planctônicas para a dinâmica da matéria orgânica na zona de confluência dos Rios Negro e Solimões (AM)“. Universidade Federal de Juiz de Fora, 2002. https://repositorio.ufjf.br/jspui/handle/ufjf/73.

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CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
Com o objeto de avaliar o papel do metabolismo bacteriano para a dinâmica da matéria orgânica (MO) na região de confluência dos rios Negro e Solimões, foram estimadas em escala espacial: o metabolismo bacteriano - produção bacteriana (PB), respiração bacteriana (RB), demanda bacteriana de carbono (DBC) e eficiência de crescimento bacteriana (ECB), além de variáveis físicas e químicas, como nutrientes inorgânicos, carbono orgânico dissolvido (COD), razões estequiométricas dos nutrientes, condutividade elétrica e turbidez. Um experimento foi realizado para estimar a contribuição do metabolismo bacteriano e dos processos de adsorção da MO para o decaimento de COD na região de mistura das águas. As taxas metabólicas apresentaram variabilidade longitudinal e lateral ao longo da região de confluência dos rios Negro e Solimões, entretanto, não foi observado incremento das taxas metabólicas com o aumento da mistura das águas em condições in situ. A PB variou de 0,03 a 0,56 μgC L-1 h-1 e a RB de 38,8 a 78,73 μgC L-1 h-1, refletindo em baixos valores de ECB, em média 0,236%, ou seja, as bactérias heterotróficas alocam a maior parte da MO disponível para os processos catabólicos das células, o que resulta na rápida remineralização de carbono e nutrientes nestes sistemas. De uma maneira geral, os nutrientes e a qualidade e quantidade da MO parecem ter sido os fatores com maior influência sobre o metabolismo bacteriano na região estudada. O metabolismo bacteriano mostrou-se como principal componente para o decaimento de carbono, porém a adsorção da MO é de grande importância no processamento da MO, principalmente na zona de mistura das águas. Os resultados do presente estudo mostraram que as bactérias planctônicas contribuem significativamente para a transformação da MO, sendo que as altas taxas de RB destacam o importante papel das bactérias planctônicas para a remineralização de carbono e nutrientes na zona de confluência dos rios Negro e Solimões.
In order to evaluated the role of bacterial metabolism for the organic matter (OM) dynamics on the confluence zone of Negro and Solimões rivers, it was estimated in spatial scale: bacterial production (BP), bacterial respiration (BR), bacterial carbon demand (BCD), bacterial growth efficiency (BGE), in addition, chemical and physical variables, such as inorganic nutrients, dissolved organic carbon (DOC), stoichiometric ratio of nutrients, conductivity and turbidity. An experiment was conducted to estimate the contribution of bacterial activity and sorption process of OM to the DOC decay on the mixing waters. The metabolic rates showed longitudinal and lateral variability along Negro and Solimões rivers. However, it was observed in the metabolic rates with the increase of mixing waters in situ. The BP ranged between 0,03 and 0,56 μgC L-1 h-1 and the BR between 38,8 and 78,73 μgC L-1 h-1, reflecting in low BGE rates, average 0,236%, which means the heterotrophic bacteria allocated major part of OM available to the cells catabolic process, resulting in a quick remineralization of carbon and nutrients on these systems. In general, the nutrients and the quality and quantity of OM were the factors that most contributed to bacterial metabolism in the studied site. The bacterial metabolism showed as major component to the DOC decay, however, the OM sorption process is very important to the OM processing, mainly on water mixing zone. The results of this study showed that planktonic bacteria significantly contributed to the processing of OM, and high BR rates highlight the important role of planktonic bacteria for the carbon and nutrient remineralization on the confluence zone of the Negro and Solimões rivers.

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Tassone, Spencer. „A comparison of computational methods for estimating estuarine production and respiration from diel open water dissolved oxygen measurements“. VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4988.

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Diel dissolved oxygen (DO) data were used to characterize seasonal, inter-annual, and longitudinal variation in production and respiration for the James River Estuary. Two computational methods (Bayesian and bookkeeping) were applied to these data to determine whether inferences regarding DO metabolism are sensitive to methodology. Net metabolism was sensitive to methodology as Bayesian results indicated net heterotrophy (production < respiration) while bookkeeping results indicated net autotrophy (production > respiration). Differences in net metabolism among the methods was due to low seasonal variation in respiration using the Bayesian method, whereas bookkeeping results showed a strong correlation between production and respiration. Bayesian results suggest a dependence on allochthonous organic matter (OM) whereas bookkeeping results suggest that metabolism is dependent on autochthonous OM. This study highlights the importance in considering the method used to derive metabolic estimates as it can impact the assessment of trophic status and sources of OM supporting an estuary.

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Stuart, Anne. „ELEMENTAL COMPOSITION AND NUTRIENT EFFECT ON THE UPTAKE AND METABOLISM OF DISSOLVED ORGANIC CARBON BY BACTERIA FROM A TEMPERATE REGION RIVER“. VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/11.

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Rivers are arteries that connect land and sea, and provide a conduit and reactor for allochthonous and autochthonous organic carbon sources (OC) delivered to the coastal ocean. In comparison to marine waters, inland waters quantitatively represent only a fraction of the marine system; however, their importance to global C cycling maybe disproportional to its actual size. Inland systems are subject to multiple sources of OC (autochthonous and allochthonous) that vary individually in space and time with respect to their concentration and potential bacterial bioavailability. This study investigates the impact of high and ambient inorganic nutrient concentrations on the bacterial bioavailability of potential exogenous and internal organic C sources to bacterial decomposition in the Chickahominy River using a long term incubation approach. In addition the elemental composition of each organic C substrate is investigated as a predictor of OC source bioavailability. The results of sole source incubations showed that autochthonous SAV sources were the most labile whereas soil derived OC was the least bioavailable, irrespective of nutrients. However, leaf litter sources showed relatively high bioavailability. The C:N ratios of SAV, Peltandra virginica, Botryococcus braunii, leaf litter, and soil (19.6, 12.4, 15, 29.7, 8.4 respectively) oppose historically accepted theory that autochthonous OC sources with low C:N ratios are a more bioavailable substrate for bacteria than allochthonous OC substrates with higher C:N ratios. The results of this study should provide a better of understanding of the interaction between inorganic nutrients and OC decomposition from allochthonous and autochthonous sources as well and potentially allow model prediction of OC lability based on its elemental signature.

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Bücher zum Thema "River metabolism"

Stefan, Anderberg, und International Institute for Applied Systems Analysis, Hrsg. Old sins: Industrial metabolism, heavy metal pollution, and environmental transition in central Europe. Tokyo: United Nations University Press, 2000.

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Biofilms fluvials: Metabolisme heterotròfic i autotròfic en rius mediterranis. Barcelona: Institut d'Estudis Catalans, 2001.

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Colombo, Michael J. Nutrient enrichment, phytoplankton algal growth, and estimated rates of instream metabolic processes in the Quinebaug River basin, Connecticut, 2000-2001. Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

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Masese, Frank Onderi. Dynamics in Organic Matter Processing, Ecosystem Metabolism and Tropic Sources for Consumers in the Mara River, Kenya. Taylor & Francis Group, 2015.

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Dynamics in Organic Matter Processing Ecosystem Metabolism and Tropic Sources for Consumers in the Mara River Kenya. Taylor & Francis Group, 2018.

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Bott, T. L. Bethnic community metabolism in four temperate stream systems: An inter-biome comparison and evaluation of the river continuum concept. 1985.

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Prieler, Sylvia, Stefan Anderberg und Krzysztof Olendrzynski. Old Sins: Industrial Metabolism, Heavy Metal Pollution, and Environmental Transition in Central Europe. United Nations University Press, 2000.

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MARROQUÍN-DE JESÚS, Ángel, Juan Manuel OLIVARES-RAMÍREZ, Andrés DECTOR-ESPINOZA und Luis Eduardo CRUZ-CARPIO. CIERMMI Women in Science Biology, Chemistry and Life Sciences Handbook T-XIV. ECORFAN-Mexico, S.C., 2021. http://dx.doi.org/10.35429/h.2021.14.1.119.

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This volume, Women in Science T-XIV-2021 contains 7 refereed chapters dealing with these issues, chosen from among the contributions, we gathered some researchers and graduate students from the 32 states of our country. We thank the reviewers for their feedback that contributed greatly in improving the book chapters for publication in these proceedings by reviewing the manuscripts that were submitted. As first chapter, Martínez, Bravo, Sánchez and Montoya present Effect of the consumption of Stevia rebaudiana Bertoni as a natural and artificial sweetener on fatigue and oxidative stress of skeletal muscle, as second chapter, Hernández, Ramírez, Chávez and Oliart, will talk about Cashew bagasse (Anacardium occidentale L. ) as a source of fiber-antioxidant and its possible use in lipoinflammation models as the third chapter, Marcos, Ramirez, Oliart, and Guadarrama present The relevance of the source of animal or vegetable proteins on the metabolic syndrome and its comorbidities, as the fourth chapter, Damián, Rivera, Lizárraga and Vázquez. propose Wanderings of a magic element: the biogeochemical cycle of manganese, as the fifth chapter, Sánchez, Paniagua, Temiche and Alexander, perform Methods of physical control of pathogenic microorganisms in hospital areas, as the sixth chapter, Paniagua, Sánchez, Corro and Alexander develop Use of power ultrasound, supercritical fluids and membrane technology to obtain and/or preserve biological products for clinical use, and as the last chapter, Estrada, Figueroa, Sierra and Aguilar, focus on Obtaining and characterization of the ethanolic extract of the leaves of the Tradescantia Spathacea SW.

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Buchteile zum Thema "River metabolism"

Carmouze, Jean-Pierre, Bias de Farias, Marcelo Corrêa Bernardes und Kátia Naomi Kuroshima. „Benthic influence on the metabolism of a shallow tropical lagoon (Lagoa da Barra, Brazil)“. In Oceans, Rivers and Lakes: Energy and Substance Transfers at Interfaces, 89–100. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5266-2_7.

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De Martino, Paolo. „Towards Circular Port–City Territories“. In Regenerative Territories, 161–71. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-78536-9_10.

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AbstractPort and city authorities all over Europe and beyond are striving with finding solutions able to combine sustainability with economic growth. Several global urgencies in fact, such as climate change, energy transition, the exponential changes in the scale of ports and ships and last but not least the economic and health shock related to the coronavirus pandemic, are challenging the spaces where ports physically meet their cities, generating processes of caesura within the urban patterns with consequent impacts on the quality of life. In port cities, infrastructures and energy flows overlap with city flows and patterns that change with different rhythms and temporalities. This discrepancy creates abandonment and marginality between port and city. This today is no longer sustainable. New approaches and solutions that look at integration and circularity rather than separation are necessary.Circularity has been widely discussed in the literature. However, the concept still remains very controversial, especially when it comes to port cities where new definitions are needed in particular to better understand the spatial dimension of circularity. The Rotterdam therefore case study stands exemplary. Here, the concept of the circular economy refers mostly to the theme of obsolete industrial buildings and marginal that are reinserted again within the urban metabolism. The case of Rotterdam points out that the competition of the port today goes through the quality of its relationship spaces and the ability of the different actors involved in the planning process to hold together economic growth and environmental sustainability. The areas along the river are in fact the most fascinating places in the city and today they are ready for a different use. In order for the city to become an attractive place to live it is necessary to build new, innovative and sustainable spatial visions. This will lead to scenarios of sustainable coexistence between port and city. Therefore, these two agendas (sustainable port and city attractiveness) came together in the area known as Makers district (M4H) which, together with RDM campus, represents the Rotterdam testing ground for innovation.Therefore, this chapter, by arguing that ports will play a crucial role in the transition towards more circularity investigates how to make it happen and how to transform the challenges of the port into opportunities for a territorial regeneration towards new forms of integration. In order to answer the question, the case of Rotterdam is presented to analyse a model of urban regeneration where different planning agencies—mainly port authority, municipality, universities and private parties—work together at different scales to define a sustainable coexistence of interests. The research, which draws data on existing literature and policy documents analysis, firstly introduces the spatial and governance structures of the city of Rotterdam as part of a bigger metropolitan region. Secondly, it analyses the case of “Stadshavens strategy” as an emblematic example to overcome conflicts and path dependencies at the intersection of land and water. Finally, it concludes by highlighting some limitations and path dependencies that could make the transition to new forms of the circular economy very difficult in the future.

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Gangstad, Edward O. „Metabolism Studies of 2,4-D in Fish*“. In Weed Control Methods for River Basin Management, 169–72. CRC Press, 2018. http://dx.doi.org/10.1201/9781351077729-23.

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Acuña, Vicenç, Anna Freixa, Rafael Marcé und Xisca Timoner. „Ecosystem Metabolism in River Networks and Climate Change“. In Climate Change and Microbial Ecology: Current Research and Future Trends (Second Edition). Caister Academic Press, 2020. http://dx.doi.org/10.21775/9781913652579.14.

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Rojano, F., David H. Huber, Ifeoma R. Ugwuanyi, Vadesse Lhilhi Noundou, Andrielle L. Kemajou Tchamba und Jesus E. Chavarria-Palma. „Insights from river metabolism assisted by hydrodynamics and a high frequency monitoring system of water quality for Kanawha River, West Virginia“. In River Flow 2020, 2110–18. CRC Press, 2020. http://dx.doi.org/10.1201/b22619-295.

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Acuña, Vicenç, Rafael Marcé und Xisca Timoner. „Ecosystem Metabolism in River Networks and Global Climate Change“. In Climate Change and Microbial Ecology: Current Research and Future Trends, 137–52. Caister Academic Press, 2016. http://dx.doi.org/10.21775/9781910190319.09.

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„Anadromous Sturgeons: Habitats, Threats, and Management“. In Anadromous Sturgeons: Habitats, Threats, and Management, herausgegeben von Daryl C. Parkyn, Debra J. Murie, Julianne E. Harris, Douglas E. Colle und James D. Holloway. American Fisheries Society, 2007. http://dx.doi.org/10.47886/9781888569919.ch3.

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<em>Abstract.â€”</em>Eighteen Gulf of Mexico sturgeon <em>Acipenser oxyrinchus desotoi</em> netted at the mouth of the Suwannee River, Florida, in Februaryâ€“April 2001, were tagged with ultrasonic transmitters to examine riverine and estuarine movements. In addition, 30 fish (11 carrying ultrasonic transmitters) were fitted with archival temperature-logging tags to record temperatures encountered by Gulf sturgeon over the course of a year, including both their riverine and estuarine residency. Movement rates of Gulf sturgeon in the Suwannee River were greatest during the upstream migration in March and April 2001 (4.8 km/d) and upon their emigration from the river in September 2001 (6.4 and 16.0 km/d for males and females, respectively). Mean maximum distance that fish were relocated upstream was significantly greater for male Gulf sturgeon (165 km) than for females (126 km). This may relate to female Gulf sturgeon not spawning annually and thus not migrating to putative spawning grounds upriver. In contrast, rates of upstream movement did not differ significantly between sexes. Movements in the nearshore regions of the Suwannee River estuary did not differ between males and females (0.8 and 2.2 km/d, respectively), and was much lower than in the river. Three Gulf sturgeon bearing archival temperature tags were recovered in subsequent netting activities in 2002. Data downloaded from the tags demonstrated that on average Gulf sturgeon were exposed to a 13Â°C annual flux in temperature, ranging from 26Â°C in the river during the summer to 13Â°C in the estuary in the winter, although individual fish experienced as much as a 20Â°C range (8.1â€“28.5Â°C) over the course of a year. Given the influence of temperature on the metabolism of ectotherms such as sturgeon, this broad fluctuation in temperature may have profound implications for the bioenergetics, and hence growth and reproduction, of Gulf sturgeon.

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BARLES, SABINE. „THE SEINE AND PARISIAN METABOLISM:“. In Urban Rivers, 95–112. University of Pittsburgh Press, 2012. http://dx.doi.org/10.2307/j.ctv10tq43d.10.

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Hall, Robert O. „Metabolism of Streams and Rivers“. In Stream Ecosystems in a Changing Environment, 151–80. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-12-405890-3.00004-x.

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El-Daoushy, Farid. „Assessing Environment-Climate Impacts in the Nile Basin for Decision-making“. In Green Technologies, 694–712. IGI Global, 2011. http://dx.doi.org/10.4018/978-1-60960-472-1.ch407.

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Assessing the environmental and climatic impacts in the Nile Basin is imperative for appropriate decision and policy making on national and regional levels. Tracer techniques provide basic spatio-temporal tools for quantifying ongoing and past, and for predicting future, environmental and climatic impacts in whole Nile Basin. These tools allow the sustainable use of the natural resources through developing appropriate large-scale and long-term management and planning strategies. Radiotracers, for example, have diverse properties, unique sources and cycles in the environment. They provide powerful approaches to understand the behaviour of atmospheric processes, and the role of dry and wet-deposition on transfer of matter from the atmosphere to the earth’s surface. They are, also, useful for assessing the present status and evolution, as well as for quantifying the functioning and metabolism, in complex aquatic and land-water systems through appropriate definition of the spatio-temporal scales forcing their interactions with the environment and climate. They yield rich data on sources, pathways and flow-rates of matter (e.g. nutrients and pollutants) within and between landscape units and at the critical boundaries of the hydrosphere with the lithosphere, ecosphere and the atmosphere. Mitigation and adaptation strategies for coupled environment-climate policies require records and observations supported by model and forecasting infra-structures that can simulate the impacts of coupled environment-climate changes both on local and landscape scales. Impacts of global warming are not straightforward to predict unless reasonable scales can be used to compile and collate the diverse climatic and environmental data. Coordinated studies and observations of complex river-, lake-catchment, land-water and delta-coastal systems can provide a wide-range of information on human and climate impacts through using radiotracers as common time and space indicators for assessing the flow of matter on earth’s surface. In this context, the Nile Basin can serve as a model for coupled environment-climate impact studies in complex aquatic systems where sustainable management policies, e.g. use of natural resources, protection and rehabilitation, are needed.

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Konferenzberichte zum Thema "River metabolism"

Rosario, Grace M., und Gabrielle C. L. David. „ASSESSING THE EFFECTS OF LARGE WOOD AND STREAM METABOLISM IN THE ASSABET RIVER, MA“. In 51st Annual Northeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016ne-272849.

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Milošković, Aleksandra, Nataša Kojadinović, Milena Radenković, Simona Đuretanović, Tijana Veličković, Marijana Nikolić und Vladica Simić. „POTENTIALLY TOXIC ELEMENTS IN LOWLAND GREAT MORAVA RIVER – BIOINDICATION WITH BLEAK (ALBURNUS ALBURNUS)“. In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.097m.

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The utilization of fish bioindicators has become of crucial importance for ecosystem contamination assessment. Bleak (Alburnus alburnus) is a widely distributed epipelagic fish species characterized as very active with fast metabolism which can lead to a high accumulation of pollutants in tissues. Bleak is easy to sample, identify in the field by morphological characteristics, and easy to work within the laboratory. This study deals with the bleak sensitivity in detecting the pressure of the potentially toxic elements (PTEs) in the large lowland Great Morava River. The Al, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sn, and Zn were estimated in whole body composite (wbc) of bleak. The study was conducted at Great Morava River, near the city of Paraćin in Serbia. The highest concentrations of essential elements Zn and Fe were detected. The most toxic elements As and Hg were below detection limits. The metal pollution index (MPI) was 0.39. In large lowland rivers, point sources of pollution such as municipal wastewaters of smaller settlements usually have only local impact due to high dilution by the main watercourse. Since bleak is a site-specific species, results in this study indicated that this stretch of the Great Morava River is slightly affected by PTEs. None of the elements above the maximum permitted concentrations (MPC) in fish meat for use in the human diet, prescribed by the Official Gazette and European Commission Regulation, were not recorded.

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Angelotti, Austin, Rachel Cole, Amy Webb, Maciej Pietrzak und Martha Belury. „Diet-induced Gene Expression Changes of Cachectic Muscle, Adipose, and Liver“. In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/gvbe2596.

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Cancer cachexia is a systemic disease characterized by muscle and adipose loss that cannot be reversed by increasing caloric intake. Our previous research has shown insulin resistance precedes cancer cachexia in the C26 mouse model of cachexia, and a diet high in linoleic acid, the essential omega-6 polyunsaturated fatty acid, attenuates the C26-induced insulin resistance. Therefore, to better understand how dietary linoleic acid is improving insulin sensitivity, we characterized gene expression changes in three major tissues responsible for controlling insulin sensitivity: skeletal muscle, adipose, and liver. To do this male CD2F1 (Charles River, MA) were randomized to semi-purified diet (24% fat by weight) containing fat prominently from lard, or containing fat prominently from safflower oil (a linoleic acid-rich oil). One week after diet randomization, mice were inoculated with colon-26 (C26) adenocarcinoma cells (1.0E6 cells). 13 days after inoculation mice were euthanized and gastrocnemius skeletal muscle, epididymal white adipose tissue, and liver tissue were collected for total transcriptome analysis using poly-A enriched next generation RNA-sequencing. Differentially expressed genes were selected based on p-values < 0.05. There were no detectable differences in body weight or food intake between the two diets in mice with C26 tumors. Between the two diets 12 genes were differentially expressed in the muscle, while 57 genes were differentially expressed in the liver, and 314 genes were differentially expressed in adipose. A linoleic acid enriched diet had little effect on the skeletal muscle transcriptome but induced larger transcriptome changes in liver and adipose. This could suggest dietary linoleic acid increases insulin sensitivity through affecting metabolism in adipose and liver, rather than skeletal muscle. Determining these diet-induced transcriptome changes allows us to better target tissue-specific molecular mechanisms of linoleic acid in future research.

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Lyu, Xidi, Kexi Liao, Zihan Zou, Guoxi He und Shitao Liu. „Effects of Flow Velocity on Biofilm formation and corrosion behavior of L245 steel in the presence of sulfate reducing bacteria“. In International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-24640-ms.

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Shale gas is a type of unconventional natural gas that is found primarily within reservoir rock sequences dominated by organic-rich shale, and is usually exploited by hydraulic fracturing technology, which typically requires a large amount of water to be injected into the gas well, and when the fracturing process is completed, a portion of the injected water immediately flows back. The fracturing flow-back fluid contains a large number of microorganisms when it enters the surface gathering and transportation system, resulting severe internal corrosion of the pipelines, especially those built during the early exploitation process, using carbon steel like L245 steel[1]. The anoxic environment and large amount of fluid accumulation in the pipeline provide appropriate conditions for the growth and reproduction of microorganisms, which increased the risk of Microbiologically Influenced Corrosion (MIC). MIC is a prevalent form of corrosion instigated by the bioactivity of diverse microorganisms. Representing a substantial challenge in the oil and gas sector, it is estimated that MIC accounts for approximately 40% of all incidents of internal pipeline corrosion[2]. SRB are typically considered the primary culprits in causing MIC, mainly because SRB are often found at the sites of corrosion believed to be associated with MIC[3]. SRB is a general term for a group of bacteria that are widely distributed in anaerobic environments, such as soil, seawater, river water, underground pipes and oil & gas wells where are rich in organic matter and sulfate[4-6]. The presence of SRB will lead to the corrosion of metal pipelines and equipment, moreover, its corrosion products FeS and Fe(OH)2 and the bacteria themselves will cause the blockage of pipelines and formation, and affect the subsequent gas production and development. SRB can use sulfides with valence states above -2 as electron acceptors, including HSO3, S2O32- and element S, to reduce S to a stable -2 valence. SRB is a strict anaerobe, its growth and reproduction are inhibited when exposed to oxygen, but it can survive for a period of time[7]. The theories related to SRB-induced corrosion include cathode depolarization theory[8, 9], metabolite corrosion theory[10-12], concentration difference cell theory[13], Extracellular Electron Transfer (EET) theory[14, 15] and Biocatalytic Cathodic Sulfate Reduction (BCSR) theory[16]. According to the researches of many scholars, factors such as biofilm structure[17, 18], ambient temperature[19], pH level[20], Cl−[21], CO2[22], H2S[23], cathodic protection potential[24, 25] and magnetic field[26] all can affect the corrosion behavior of SRB. In oil and natural gas pipeline, the flow of medium is complicated, and the influence of flow conditions on corrosion behavior of SRB cannot be ignored. The change of flow regime and flow velocity can affect the mass transfer in the pipeline, and thus affect the biochemical reaction process[27]. Furthermore, the change of shear stress can affect the formation, breakage, detachment and spalling of the biofilm attached to the pipeline and lead to the change of the state of the pipe wall and the corrosion state and potential, shear stress can even affect the transport, transfer and reaction rates of materials under the biofilm[28]. It is generally believed that the flow of the medium is not conducive to the adhesion of microbial cells on the pipelines’ surface and the formation of biofilm. On the one hand, polarization agents such as H and H2O in the fluid can rapidly diffuse to the electrode surface and improve the reaction rate of cathode. On the other hand, higher flow velocity can make the anodized ions leave the metal surface quickly, improve the anodic dissolution rate, and also affect the formation of the corrosion product film or destroy the product film that has been generated[29]. Some scholars have also found that under low Reynolds number, the biofilm formed on the inner wall of pipeline has a high content of active bacteria, while under high Reynolds number, the biofilm has a high content of extracellular polymeric substance (EPS)[30]. Scholars have made a lot of contributions to the study of SRB-induced corrosion and MIC, but there are few researches focus on the influence of hydraulic conditions on SRB corrosion. In particular, the variation of metal surface and SRB corrosion rate at different flow velocities, the influence of fluid flow on corrosion characteristics and the underlying corrosion mechanism have not been reported.

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