To see the other types of publications on this topic, follow the link: Riverine.
Journal articles on the topic 'Riverine'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Riverine.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Debnath, Sumon, Gulshan Ara Latifa, Mohajira Begum, and Md Abu Obaida. "Evaluation of nutritional values of smoke cured riverine and marine hilsa (Tenualosa ilisha; Hamilton, 1882)." Bangladesh Journal of Zoology 46, no. 2 (2018): 177–84. http://dx.doi.org/10.3329/bjz.v46i2.39051.
Full textAbstract:
Present study was conducted to evaluate nutritional values of smoked hilsa fish (Tenualosa ilisha; Hamilton, 1882) in relation to its raw condition. Smoking is one of the processes of fish preservation from ancient period of our country. The nutrients values of the hilsa from two different regions were significantly (p < 0.05) varied. The nutritional values were different before and after processing of hilsa. Riverine hilsa contains relatively more moisture (56.45 ± 0.51%) and protein (15.98 ± 0.50%) than marine hilsa. Fat (16.18 ± 0.45%) and salt (1.92 ± 0.18%) contents are higher in marine hilsa; whereas ash (8.34 ± 0.35%) content was higher in riverine hilsa. Minerals like iron (4.72 ± 0.08 mg/100 g) and calcium (481.77 ± 6.20 mg/100g) remain in large amount on marine hilsa but phosphorus (115.73 ± 4.36 mg/100 g) content remain high level in riverine hilsa. In addition, the protein (raw condition, 19.54 ± 0.47%, riverine; 17.12 ± 0.42%, marine and smoked condition, 29.64 ± 0.41%, riverine; 28.51 ± 0.51%, marine) and fat (raw condition, 16.41 ± 0.46%, riverine; 20.07 ± 0.39%, marine and smoked condition, 20.71 ± 0.47%, riverine; 23.31 ± 0.47%, marine) content were higher in abdominal region of riverine and marine hilsa both raw and smoked condition than head region (protein in raw condition, 11.21 ± 0.51%, riverine; 10.51 ± 0.53%, marine and smoked condition, 17.14 ± 0.42%, riverine; 15.69 ± 0.4%, marine; fat in raw condition, 9.04 ± 0.45%, riverine; 11.21 ± 0.51%, marine and smoked condition, 12.32 ± 0.44%, riverine; 14.56 ± 0.47%, marine) and caudal region (protein in raw condition17.21 ± 0.52%, riverine; 15.22 ± 0.66%, marine and smoked condition, 27.68 ± 0.44%, riverine; 26.73 ± 0.46%, marine; fat in raw condition, 14.05 ± 0.5%, riverine; 17.28 ± 0.47%, marine and smoked condition, 17.35 ± 0.43%, riverine; 19.18 ± 0.51%, marine).
Bangladesh J. Zool. 46(2): 177-184, 2018
2
Armstrong, Anna. "Riverine carbon unravelled." Nature Geoscience 5, no. 10 (2012): 684. http://dx.doi.org/10.1038/ngeo1599.
Full text
3
ESTES, J. A. "Riverine Mammals: Otters." Science 233, no. 4770 (1986): 1333–34. http://dx.doi.org/10.1126/science.233.4770.1333-a.
Full text
4
WARD, J. V., K. TOCKNER, D. B. ARSCOTT, and C. CLARET. "Riverine landscape diversity." Freshwater Biology 47, no. 4 (2002): 517–39. http://dx.doi.org/10.1046/j.1365-2427.2002.00893.x.
Full text
5
Gaudin, P. "Habitat shifts in juvenile riverine fishes." River Systems 12, no. 2-4 (2001): 393–408. http://dx.doi.org/10.1127/lr/12/2001/393.
Full text
6
Starzecka, Aleksandra, and Teresa Bednarz. "Mineralization of phycodetritus in riverine water." Algological Studies/Archiv für Hydrobiologie, Supplement Volumes 115 (April 1, 2005): 159–69. http://dx.doi.org/10.1127/1864-1318/2005/0115-0159.
Full text
7
Mai, Lei, Xiang-Fei Sun, Lin-Lin Xia, Lian-Jun Bao, Liang-Ying Liu, and Eddy Y. Zeng. "Global Riverine Plastic Outflows." Environmental Science & Technology 54, no. 16 (2020): 10049–56. http://dx.doi.org/10.1021/acs.est.0c02273.
Full text
8
Thoms, Martin C. "Variability in riverine ecosystems." River Research and Applications 22, no. 2 (2006): 115–21. http://dx.doi.org/10.1002/rra.900.
Full text
9
Melack, John. "Riverine carbon dioxide release." Nature Geoscience 4, no. 12 (2011): 821–22. http://dx.doi.org/10.1038/ngeo1333.
Full text
10
Sugden, A. M. "ECOLOGY/EVOLUTION: Riverine Barriers." Science 290, no. 5500 (2000): 2213b—2213. http://dx.doi.org/10.1126/science.290.5500.2213b.
Full text
11
TOCKNER, K., J. V. WARD, P. J. EDWARDS, and J. KOLLMANN. "Riverine landscapes: an introduction." Freshwater Biology 47, no. 4 (2002): 497–500. http://dx.doi.org/10.1046/j.1365-2427.2002.00913.x.
Full text
12
Hooper, BP, and JA Duggin. "Ecological riverine floodplain zoning." Land Use Policy 13, no. 2 (1996): 87–99. http://dx.doi.org/10.1016/0264-8377(95)00049-6.
Full text
13
Baklazhenko, E. "CLASSIFICATION AND ZONING OF RIVERINE TERRITORIES OF SMALL CITIES ON THE EXAMPLE OF THE BELGOROD REGION." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 5, no. 8 (2020): 61–68. http://dx.doi.org/10.34031/2071-7318-2020-5-8-61-68.
Full textAbstract:
Riverine territories of the city are a special functional and typological subsystem with constantly emerging environmental problems, experiencing a stable anthropogenic load and requiring the development of its own zoning system. The article presents the systematization of riverine territories with different typological characteristics, and examines the accumulated experience of landscape classification. Riverine territories are also considered as part of the general typology of urban anthropogenic landscapes. Based on a field study of riverine spaces within the boundaries of small towns of the Belgorod region, existing land categories and the most common functional zones are identified. The scientific research is based on a contextual, theoretical, empirical and practical analysis of urban municipal landscapes and riverine territories of the cities of Valuek, Korocha, Alekseyevka, Grayvoron, Shebekino, Biryuch, Novy Oskol. A generalized system of typological zoning for riverine territories of small cities is proposed. As a result of the study, three most common types of territory are identified: natural green areas, natural and anthropogenic landscapes and built-up areas.
14
Mushi, Douglas, Geda Kebede, Rita B. Linke, et al. "Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources." Journal of Water and Health 19, no. 4 (2021): 575–91. http://dx.doi.org/10.2166/wh.2021.269.
Full textAbstract:
Abstract Tropical communities in the developing world depend heavily on riverine systems for their socioeconomic development. However, these resources are poorly protected from diffuse pollution, and there is a lack of quantitative information regarding the microbial pollution characteristics of riverine water, despite frequently reported gastrointestinal diseases. The aim of our study was to apply faecal taxation (i.e., faecal pellet counting in representative test areas to estimate the potential availability of diffuse pollution sources) in combination with a detailed microbiological faecal pollution analysis in a riverine environment to elucidate the importance of diffuse pollution. To realize this approach, ambient faecal pellets, a multiparametric data set for standard faecal indicator bacteria (SFIB), including Escherichia coli, Clostridium perfringens spores and enterococci from catchment soil and river water, and a number of riverine water physicochemical variables were analysed during a one-year cycle. We demonstrated that the abundance of ambient faecal pellets, which were consistently counted at reference sites in the catchment, was associated with faecal pollution in the river water. Water SFIB, dissolved oxygen, nutrients, conductivity and total suspended solids were strongly linked with the abundance of ambient faecal pellets in the river catchment, as demonstrated by principal component analysis (PCA). Elevated concentrations of SFIB in the riverine water in the absence of rainfall also suggested the direct input of faecal bacteria into the riverine water by livestock (e.g., during watering) and humans (e.g., during bathing). Statistical analyses further revealed that the microbiological water quality of the investigated riverine water was not influenced by SFIB potentially occurring in the soil. This study demonstrates the importance of diffuse faecal pollution sources as major drivers of the microbiological quality of riverine water in the Ethiopian highlands. In addition, the new successfully applied integrated approach could be very useful for developing predictive models, which would aid in forecasting riverine microbiological quality in tropical developing countries.
15
Ellway, C., G. Murphy, L. Merton, D. Baumgartner, and A. Hempseed. "Opportunities for sustainable riverine management in the Queensland Murray-Darling Basin." Water Science and Technology 45, no. 11 (2002): 201–8. http://dx.doi.org/10.2166/wst.2002.0396.
Full textAbstract:
The RiverReach program has provided significant material, planning and educational resources to communities throughout the QMDB over the last three years. The devolved granting process has proven to be a valuable mechanism for the initiation of on-ground works and as a platform for the delivery of educational and awareness raising activities. The range of riverine management projects developed among riparian communities reflects both the socio-economic and the environmental circumstances. An increasing knowledge of riverine management issues among both the community and practitioners and a growing acceptance of the need for riverine management within the community has increased opportunities for sustainable riverine management in the region. While the range of riverine management issues is diverse, and their integration complex, the combination of all three aspects (financial assistance, technical advice, and awareness raising) has enabled significant management outcomes to be achieved.
16
VOINESCU, Bogdan, and Ionel POPESCU. "DIVERS' ACTIONS IN THE RIVERINE AREA." STRATEGIES XXI - Command and Staff College 17, no. 1 (2021): 126–33. http://dx.doi.org/10.53477/2668-2028-21-14.
Full textAbstract:
Abstract: This approach proposes an analysis and a presentation of divers’ actions in the riverine area in order to combat the risks and the threats which can occur there, correlated with the features and the characteristics of the environment and with the objectives of the Navy. The identification of new insights and opportunities of involving the divers in this domain through concrete, focused actions having a maximum effect in the preservation of a security climate in the riverine area is the novelty of this approach. While analyzing the actual possibilities of divers’ actions in the riverine area, this article is pleading regarding the importance of using divers in this environment and it is structured on two directions. The actions of the military divers in the riverine area contain these directions that meet the national objectives regarding maintenance or getting the control over the main economic and military objectives concomitant with the research, capture or destruction of enemy`s forces. I am addressing this approach to the specialists and to those who are interested in divers’ way of actions in the riverine environment. Divers are an especially important tool among the whole range of military actions in the riverine area. The actions taken by divers usually offer depth to the campaign and they have a significant role in preserving the riverine area.
17
Langerwisch, F., A. Walz, A. Rammig, B. Tietjen, K. Thonicke, and W. Cramer. "Climate change increases riverine carbon outgassing while export to the ocean remains uncertain." Earth System Dynamics Discussions 6, no. 2 (2015): 1445–97. http://dx.doi.org/10.5194/esdd-6-1445-2015.
Full textAbstract:
Abstract. Carbon fluxes in the Amazon Basin are considerably influenced by annual flooding during which terrigenous organic material is imported to the river. This regular interaction affects carbon pools within the riverine system, terrestrial carbon, and carbon exported to the ocean and released to the atmosphere. The processes of generation, conversion, and transport of organic carbon in this coupled terrigenous–riverine system strongly interact and are climate-sensitive, yet their response to climate change is still largely unknown. To quantify climate change effects on carbon pools and on carbon fluxes within the river and to the ocean and the atmosphere, we developed the riverine carbon model RivCM, which is directly coupled to the well-established dynamic vegetation and hydrology model LPJmL. We show here that RivCM successfully reproduces observed values in exported carbon and riverine carbon concentration. We evaluate future changes in riverine carbon by applying RivCM for climate forcing from five climate models and three CO2 emission scenarios (SRES). We find that climate change causes a doubling of riverine organic carbon in the Southern and Western basin while reducing it by 20 % in the eastern and northern parts. In contrast, the amount of riverine inorganic carbon shows a 2- to 3-fold increase in the entire basin, independent of the SRES scenario. The export of carbon to the atmosphere increases as well with an average of about 30 %. In contrast, changes in future export of organic carbon to the Atlantic Ocean depend on the SRES scenario and are projected to either decrease by about 8.9 % (SRES A1B) or increase by about 9.1 % (SRES A2). Such changes in the terrigenous–riverine system could have local and regional impacts on the carbon budget of the whole Amazon Basin and parts of the Atlantic Ocean. Changes in the riverine carbon could lead to a shift in the riverine nutrient supply and pH, while changes in the exported carbon to the ocean leads to changes in the supply of organic material that acts as food source in the Atlantic. On the larger scale the increased outgassing of CO2 could turn the Amazon Basin from a sink of carbon to a considerable source. Therefore we propose that the coupling of terrestrial and riverine carbon budget should be included in subsequent analysis of the future regional carbon budget.
18
Lacroix, Fabrice, Tatiana Ilyina, and Jens Hartmann. "Oceanic CO<sub>2</sub> outgassing and biological production hotspots induced by pre-industrial river loads of nutrients and carbon in a global modeling approach." Biogeosciences 17, no. 1 (2020): 55–88. http://dx.doi.org/10.5194/bg-17-55-2020.
Full textAbstract:
Abstract. Rivers are a major source of nutrients, carbon and alkalinity to the global ocean. In this study, we firstly estimate pre-industrial riverine loads of nutrients, carbon and alkalinity based on a hierarchy of weathering and terrestrial organic matter export models, while identifying regional hotspots of the riverine exports. Secondly, we implement the riverine loads into a global ocean biogeochemical model to describe their implications for oceanic nutrient concentrations, net primary production (NPP) and air–sea CO2 fluxes globally, as well as in an analysis of coastal regions. Thirdly, we quantitatively assess the terrestrial origins and the long-term fate of riverine carbon in the ocean. We quantify annual bioavailable pre-industrial riverine loads of 3.7 Tg P, 27 Tg N, 158 Tg Si and 603 Tg C delivered to the ocean globally. We thereby identify the tropical Atlantic catchments (20 % of global C), Arctic rivers (9 % of global C) and Southeast Asian rivers (15 % of global C) as dominant suppliers of carbon for the ocean. The riverine exports lead to a simulated net global oceanic CO2 source of 231 Tg C yr−1 to the atmosphere, which is mainly caused by inorganic carbon (source of 183 Tg C yr−1) and by organic carbon (source of 128 Tg C yr−1) riverine loads. Additionally, a sink of 80 Tg C yr−1 is caused by the enhancement of the biological carbon uptake from dissolved inorganic nutrient inputs from rivers and the resulting alkalinity production. While large outgassing fluxes are simulated mostly in proximity to major river mouths, substantial outgassing fluxes can be found further offshore, most prominently in the tropical Atlantic. Furthermore, we find evidence for the interhemispheric transfer of carbon in the model; we detect a larger relative outgassing flux (49 % of global riverine-induced outgassing) in the Southern Hemisphere in comparison to the hemisphere's relative riverine inputs (33 % of global C inputs), as well as an outgassing flux of 17 Tg C yr−1 in the Southern Ocean. The addition of riverine loads in the model leads to a strong NPP increase in the tropical west Atlantic, Bay of Bengal and the East China Sea (+166 %, +377 % and +71 %, respectively). On the light-limited Arctic shelves, the NPP is not strongly sensitive to riverine loads, but the CO2 flux is strongly altered regionally due to substantial dissolved inorganic and organic carbon supplies to the region. While our study confirms that the ocean circulation remains the main driver for biogeochemical distributions in the open ocean, it reveals the necessity to consider riverine inputs for the representation of heterogeneous features in the coastal ocean and to represent riverine-induced pre-industrial carbon outgassing in the ocean. It also underlines the need to consider long-term CO2 sources from volcanic and shale oxidation fluxes in order to close the framework's atmospheric carbon budget.
19
Sanches, B. O., R. M. Hughes, D. R. Macedo, M. Callisto, and G. B. Santos. "Spatial variations in fish assemblage structure in a southeastern Brazilian reservoir." Brazilian Journal of Biology 76, no. 1 (2016): 185–93. http://dx.doi.org/10.1590/1519-6984.16614.
Full textAbstract:
Abstract We assessed the fish assemblage structure and composition of Nova Ponte Reservoir (Araguari River, Upper Paraná Basin, Brazil). We observed significant differences in abundance (p = 0.0003), richness (p = 0.0005) and diversity (p = 0.02) between lacustrine and riverine zones of the reservoir. Nine species were significantly more abundant in the riverine region: Astyanax altiparanae, Astyanax gr. fasciatus, Galeocharax knerii, Hoplias intermedius, Hypostomus sp., Leporinus friderici, Leporinus obtusidens, Pimelodus maculatus and Schizodon nasutus. The results indicated a longitudinal gradient in the composition and abundance of fishes in Nova Ponte Reservoir, reinforcing the importance of freely flowing riverine reaches for conserving native neotropical ichthyofauna and reflecting the strong adaptation of these species to riverine systems.
20
Li, Junhua, Mingwu Zhang, Enhui Jiang, et al. "Influence of Floodplain Flooding on Channel Siltation Adjustment under the Effect of Vegetation on a Meandering Riverine Beach." Water 13, no. 10 (2021): 1402. http://dx.doi.org/10.3390/w13101402.
Full textAbstract:
Flooding in a sediment-laden floodplain is affected by riverine beach vegetation and the shape of a meandering compound channel. The laws of water and sediment exchange and the deposition distribution in beach troughs are very complex. These factors play a significant role in the formation and development of secondary suspended rivers, in the adjustment of the beach horizontal gradient, and even in the evolution of the flood control situation. In this study, we used a combination of experimental simulation and theoretical research to carry out a generalized model test of floodplain flooding evolution, analyzed the lateral distribution characteristics of sediment-laden flow and sediment factors in a meandering compound channel under the conditions of beach vegetation, and revealed the pros and cons of beach vegetation on the adjustment of the beach and channel siltation. The model test results of the flooding in the floodplain in the compound channel with meandering vegetation showed that the main stream was not only concentrated in the main channel but also appeared near the foot of the left and right bank levees and formed flood discharges along the embankment. As the riverine beach siltation was mainly concentrated at the riverine beach lip, the vegetation on the riverine beach had a significant effect on slowing down the flow velocity. Whether it was a row or full vegetation on both sides of the bank, this played an important role in the stability of the main channel. When there was no vegetation on the riverine beach, the main channel was easy to move. The arrangement of full vegetation on the riverine beach had a uniform effect on the velocity distribution of the riverine beach, which reduced the phenomenon of excessive velocity at the foot of the riverine beach and increased the velocity effect in the main channel. These results will provide a theoretical basis for the utilization of riverine beach areas and river management in the lower Yellow River and have a great significance for enriching the basic theory of water and sediment movement and promoting the integration of hydraulics, river dynamics, and ecology.
21
Kenney, B. C. "Phosphorus Dynamics in Riverine Lakes." Water Quality Research Journal 29, no. 2-3 (1994): 185–202. http://dx.doi.org/10.2166/wqrj.1994.013.
Full textAbstract:
Abstract Simple models based on conservation of mass capture the essential dynamics of total phosphorus in lakes. The concentration of total phosphorus in shallow riverine lakes on the Prairies was simulated as a forced response to the inflow concentration. The lake dynamics were characterized by three independent time scales based on water inflow, water outflow and sedimentation. Both inflow and outflow time scales were necessary to model lakes with non-stationary hydrographe and varying lake levels. Flood periods had a pronounced effect on lake phosphorus because high concentrations in the inflow occurred when the lake was dynamically able to respond. In the Fishing Lakes, the 1974 flood appears to have established the lake conditions for the next decade. Most other large peaks in the concentration of total phosphorus in the inflow occurred when the outflow time scale was large and the lakes were dynamically unable to respond. Net sedimentation of total phosphorus appeared to be zero in these lakes over the two decades for which data were available. Verification of the lack of net sedimentation in shallow lakes means that no model calibration is needed to apply these simple models to other shallow lakes. Presently, however, even the simplest models are restricted by the lack of appropriate data required for verification.
22
Windsor, Fredric M., Rosie M. Tilley, Charles R. Tyler, and Steve J. Ormerod. "Microplastic ingestion by riverine macroinvertebrates." Science of The Total Environment 646 (January 2019): 68–74. http://dx.doi.org/10.1016/j.scitotenv.2018.07.271.
Full text
23
Wolf, R. J. A. M., J. G. Vrielink, and R. W. De Waal. "Riverine Woodlands in the Netherlands." Global Ecology and Biogeography Letters 6, no. 3/4 (1997): 287. http://dx.doi.org/10.2307/2997742.
Full text
24
Muste, Marian, Tracy Vermeyen, Rollin Hotchkiss, and Kevin Oberg. "Acoustic Velocimetry for Riverine Environments." Journal of Hydraulic Engineering 133, no. 12 (2007): 1297–98. http://dx.doi.org/10.1061/(asce)0733-9429(2007)133:12(1297).
Full text
25
Claude, Laveissiere, Eouzan Jean-Pierre, Grebaut Pascal, and Lemasson Jean-Jacques. "The control of riverine tsetse." International Journal of Tropical Insect Science 11, no. 03 (1990): 427–41. http://dx.doi.org/10.1017/s1742758400012856.
Full text
26
Delong, Michael D., Thomas Hein, and Martin C. Thoms. "The modification of riverine landscapes." River Systems 21, no. 2 (2015): 91–92. http://dx.doi.org/10.1127/rs/2015/0e55.
Full text
27
Williams, A. T., and S. L. Simmons. "Movement patterns of riverine litter." Water, Air, and Soil Pollution 98, no. 1-2 (1997): 119–39. http://dx.doi.org/10.1007/bf02128653.
Full text
28
MALMQVIST, BJÖRN. "Aquatic invertebrates in riverine landscapes." Freshwater Biology 47, no. 4 (2002): 679–94. http://dx.doi.org/10.1046/j.1365-2427.2002.00895.x.
Full text
29
MERTES, LEAL A. K. "Remote sensing of riverine landscapes." Freshwater Biology 47, no. 4 (2002): 799–816. http://dx.doi.org/10.1046/j.1365-2427.2002.00909.x.
Full text
30
CHURCH, MICHAEL. "Geomorphic thresholds in riverine landscapes." Freshwater Biology 47, no. 4 (2002): 541–57. http://dx.doi.org/10.1046/j.1365-2427.2002.00919.x.
Full text
31
Langerwisch, F., A. Walz, A. Rammig, B. Tietjen, K. Thonicke, and W. Cramer. "Climate change increases riverine carbon outgassing, while export to the ocean remains uncertain." Earth System Dynamics 7, no. 3 (2016): 559–82. http://dx.doi.org/10.5194/esd-7-559-2016.
Full textAbstract:
Abstract. Any regular interaction of land and river during flooding affects carbon pools within the terrestrial system, riverine carbon and carbon exported from the system. In the Amazon basin carbon fluxes are considerably influenced by annual flooding, during which terrigenous organic material is imported to the river. The Amazon basin therefore represents an excellent example of a tightly coupled terrestrial–riverine system. The processes of generation, conversion and transport of organic carbon in such a coupled terrigenous–riverine system strongly interact and are climate-sensitive, yet their functioning is rarely considered in Earth system models and their response to climate change is still largely unknown. To quantify regional and global carbon budgets and climate change effects on carbon pools and carbon fluxes, it is important to account for the coupling between the land, the river, the ocean and the atmosphere. We developed the RIVerine Carbon Model (RivCM), which is directly coupled to the well-established dynamic vegetation and hydrology model LPJmL, in order to account for this large-scale coupling. We evaluate RivCM with observational data and show that some of the values are reproduced quite well by the model, while we see large deviations for other variables. This is mainly caused by some simplifications we assumed. Our evaluation shows that it is possible to reproduce large-scale carbon transport across a river system but that this involves large uncertainties. Acknowledging these uncertainties, we estimate the potential changes in riverine carbon by applying RivCM for climate forcing from five climate models and three CO2 emission scenarios (Special Report on Emissions Scenarios, SRES). We find that climate change causes a doubling of riverine organic carbon in the southern and western basin while reducing it by 20 % in the eastern and northern parts. In contrast, the amount of riverine inorganic carbon shows a 2- to 3-fold increase in the entire basin, independent of the SRES scenario. The export of carbon to the atmosphere increases as well, with an average of about 30 %. In contrast, changes in future export of organic carbon to the Atlantic Ocean depend on the SRES scenario and are projected to either decrease by about 8.9 % (SRES A1B) or increase by about 9.1 % (SRES A2). Such changes in the terrigenous–riverine system could have local and regional impacts on the carbon budget of the whole Amazon basin and parts of the Atlantic Ocean. Changes in riverine carbon could lead to a shift in the riverine nutrient supply and pH, while changes in the exported carbon to the ocean lead to changes in the supply of organic material that acts as a food source in the Atlantic. On larger scales the increased outgassing of CO2 could turn the Amazon basin from a sink of carbon to a considerable source. Therefore, we propose that the coupling of terrestrial and riverine carbon budgets should be included in subsequent analysis of the future regional carbon budget.
32
Schmutz, S., A. Zitek, and C. Dorninger. "A new automatic drift sampler for riverine fish." Archiv für Hydrobiologie 139, no. 4 (1997): 449–60. http://dx.doi.org/10.1127/archiv-hydrobiol/139/1997/449.
Full text
33
Pan, Linyan, Junfeng Dai, Zhiqiang Wu, et al. "Spatio-Temporal Dynamics of Riverine Nitrogen and Phosphorus at Different Catchment Scales in Huixian Karst Wetland, Southwest China." Water 12, no. 10 (2020): 2924. http://dx.doi.org/10.3390/w12102924.
Full textAbstract:
Spatio-temporal dynamics of riverine nitrogen (N) and phosphorus (P) in karst regions are closely linked to hydrological conditions, human activities and karst features in upstream catchments. From October 2017 to September 2019, we undertook 22 sampling campaigns in 11 nested catchments ranging from 21.00 to 373.37 km2 in Huixian karst wetland to quantify forms, concentrations, and fluxes of riverine total nitrogen (TN) and total phosphorus (TP), and to identify spatial and temporal variations of nutrients transfer from upstream to downstream, tributaries (Mudong River and Huixian River) to the main stem (Xiangsi River) in the dry and wet seasons. Considering the hydrological conditions, human activities and karst features within upstream catchments, the following three spatial and temporal variations of riverine nutrients were found over the monitoring period: (1) the dynamics of riverine nitrogen and phosphorus varied seasonally with hydrological conditions; (2) the spatial disparities of riverine nitrogen and phosphorus were induced by different human activities within catchment scales; (3) the dynamics of riverine nitrogen and phosphorus varied similarly at spatial scale restricted by karst features. The findings from this study may improve our understanding of the influence of hydrological conditions, human activities and karst features on nitrogen and phosphorus variations in river waters at different spatial and temporal scales in the Huixian karst wetland basin, and will help managers to protect and restore river water environments in karst basin from a catchment-scale perspective.
34
Woodgate, Z., G. Distiller, and MJ O’Riain. "Hare today, gone tomorrow: the role of interspecific competition in shaping riverine rabbit occurrence." Endangered Species Research 44 (March 25, 2021): 351–61. http://dx.doi.org/10.3354/esr01106.
Full textAbstract:
Effective conservation, particularly of threatened species, requires an understanding of both abiotic and biotic drivers of distribution. In the case of one of Africa’s most endangered mammals, the riverine rabbit Bunolagus monticularis, only environmental covariates of presence have been used to provide coarse predictions of their distribution. Two potential competitors, namely scrub hare Lepus saxatilis and cape hare L. capensis, have significant (>90%) range overlap with the riverine rabbit, yet little is known about how these species interact. We used multi-species occupancy models, which model co-occurrence as a function of environmental variables, to assess the spatial response of riverine rabbits to both species of hare in Sanbona Wildlife Reserve, South Africa. We also examined temporal overlap between riverine rabbits and hares. Camera trapping data were collected from 150 camera traps distributed in clusters of 5 cameras at 30 independent sites, covering 223.24 km2. Contrary to prior studies, we found that riverine rabbits were not restricted to riparian habitat, and that their occurrence was conditional on hare absence and was negatively affected by terrain ruggedness. Whilst hare occurrence was independent of terrain ruggedness, it was negatively affected by rabbit presence. Activity patterns revealed high temporal overlap between hares and rabbits (Δ = 0.828, CI = 0.745-0.940); however, neither species co-occurred at any given site. Our results suggest that conservation management has greatly underestimated the importance of competition with other lagomorphs in understanding riverine rabbit occurrence.
35
Stone, Jeffery R. "Using Diatoms as Ecological and Paleoecological Indicators in Riverine Environments." Paleontological Society Papers 13 (October 2007): 121–30. http://dx.doi.org/10.1017/s1089332600001492.
Full textAbstract:
Fossil diatom assemblages are useful for reconstructing past environmental changes in riverine systems. However, few studies have attempted to utilize paleolimnological techniques in these settings. Analysis of sediments from riverine environments can provide key information predating the impact of human development, which cannot be acquired by other means. Paleolimnological techniques can be used to determine the natural variability in these systems and to estimate the magnitude and rates of change that the environment may have undergone as a result of anthropogenic or climatic factors, and to provide realistic goals for management of negatively-impacted systems.Reconstructing past riverine settings requires an understanding of the factors that control the spatial distribution of diatoms in riverine settings; this paper discusses the impact of resources, stressors, and disturbance events, which are the primary controls on the distribution of benthic diatoms in modern riverine environments. A selection of case studies that utilize paleolimnological techniques to infer past stream hydrology are also discussed; these examples encompass the use of fossil diatom assemblages from sediments recovered from lowland floodplain and meandering river systems, estuarine environments, fluvial lakes, arctic deltaic environments, and terminal lakes.
36
Pavey, Scott A., Troy R. Hamon, and Jennifer L. Nielsen. "Revisiting evolutionary dead ends in sockeye salmon (Oncorhynchus nerka) life history." Canadian Journal of Fisheries and Aquatic Sciences 64, no. 9 (2007): 1199–208. http://dx.doi.org/10.1139/f07-091.
Full textAbstract:
This study challenges recent hypotheses about sockeye salmon (Oncorhynchus nerka) colonization based on life history and broadens the pathways that investigators should consider when studying sockeye colonization of novel habitats. Most sockeye populations exhibit lake-type life histories. Riverine populations are thought to be more likely to stray from their natal stream to spawn and therefore colonize new habitat. We examined genetic relationships among five geographically proximate sockeye populations from the Aniakchak region of the Alaska Peninsula, Alaska. Specifically, we sought to determine if the genetic population structure was consistent with the hypothesis that a riverine population colonized a recently available upriver volcanic caldera lake, and whether recent volcanism led to genetic bottlenecks in these sockeye populations. Heterozygosity and allelic richness were not higher in the riverine population. Patterns of genetic divergence suggested that the geographically proximate riverine sockeye population did not colonize the lake; the caldera populations were more genetically divergent from the downstream riverine population (FST = 0.047) than a lake-type population in a different drainage (FST = 0.018). Our results did not suggest the presence of genetic bottlenecks in the caldera populations.
37
Carbonell-Rivera, J. P., J. Estornell, L. A. Ruiz, J. Torralba, and P. Crespo-Peremarch. "CLASSIFICATION OF UAV-BASED PHOTOGRAMMETRIC POINT CLOUDS OF RIVERINE SPECIES USING MACHINE LEARNING ALGORITHMS: A CASE STUDY IN THE PALANCIA RIVER, SPAIN." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2020 (August 12, 2020): 659–66. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2020-659-2020.
Full textAbstract:
Abstract. The management of riverine areas is fundamental due to their great environmental importance. The fast changes that occur in these areas due to river mechanics and human pressure makes it necessary to obtain data with high temporal and spatial resolution. This study proposes a workflow to map riverine species using Unmanned Aerial Vehicle (UAV) imagery. Based on RGB point clouds, our work derived simple geometric and spectral metrics to classify an area of the public hydraulic domain of the river Palancia (Spain) in five different classes: Tamarix gallica L. (French tamarisk), Pinus halepensis Miller (Aleppo pine), Arundo donax L. (giant reed), other riverine species and ground. A total of six Machine Learning (ML) methods were evaluated: Decision Trees, Extra Trees, Multilayer Perceptron, K-Nearest Neighbors, Random Forest and Ridge. The method chosen to carry out the classification was Random Forest, which obtained a mean score cross-validation close to 0.8. Subsequently, an object-based reclassification was done to improve this result, obtaining an overall accuracy of 83.6%, and individually a producer’s accuracy of 73.8% for giant reed, 87.7% for Aleppo pine, 82.8% for French tamarisk, 93.5% for ground and 80.1% for other riverine species. Results were promising, proving the feasibility of using this cost-effective method for periodic monitoring of riverine species. In addition, the proposed workflow is easily transferable to other tasks beyond riverine species classification (e.g., green areas detection, land cover classification) opening new opportunities in the use of UAVs equipped with consumer cameras for environmental applications.
38
St-Laurent, Pierre, Marjorie A. M. Friedrichs, Raymond G. Najjar, Elizabeth H. Shadwick, Hanqin Tian, and Yuanzhi Yao. "Relative impacts of global changes and regional watershed changes on the inorganic carbon balance of the Chesapeake Bay." Biogeosciences 17, no. 14 (2020): 3779–96. http://dx.doi.org/10.5194/bg-17-3779-2020.
Full textAbstract:
Abstract. The Chesapeake Bay is a large coastal-plain estuary that has experienced considerable anthropogenic change over the past century. At the regional scale, land-use change has doubled the nutrient input from rivers and led to an increase in riverine carbon and alkalinity. The bay has also experienced global changes, including the rise of atmospheric temperature and CO2. Here we seek to understand the relative impact of these changes on the inorganic carbon balance of the bay between the early 1900s and the early 2000s. We use a linked land–estuarine–ocean modeling system that includes both inorganic and organic carbon and nitrogen cycling. Sensitivity experiments are performed to isolate the effect of changes in (1) atmospheric CO2, (2) temperature, (3) riverine nitrogen loading and (4) riverine carbon and alkalinity loading. Specifically, we find that over the past century global changes have increased ingassing by roughly the same amount (∼30 Gg-C yr−1) as has the increased riverine loadings. While the former is due primarily to increases in atmospheric CO2, the latter results from increased net ecosystem production that enhances ingassing. Interestingly, these increases in ingassing are partially mitigated by increased temperatures and increased riverine carbon and alkalinity inputs, both of which enhance outgassing. Overall, the bay has evolved over the century to take up more atmospheric CO2 and produce more organic carbon. These results suggest that over the past century, changes in riverine nutrient loads have played an important role in altering coastal carbon budgets, but that ongoing global changes have also substantially affected coastal carbonate chemistry.
39
Rosa, Eric, Claude Hillaire-Marcel, Bassam Ghaleb, and Terry A. Dick. "Environmental and seasonal controls on riverine dissolved uranium in the Hudson, James, and Ungava bays region, Canada." Canadian Journal of Earth Sciences 49, no. 6 (2012): 758–71. http://dx.doi.org/10.1139/e2012-025.
Full textAbstract:
This study documents the spatiotemporal variability of riverine uranium contents and fluxes in rivers discharging into the Hudson, James, and Ungava bays (HJUB). Samples retrieved during a monitoring program of the Koksoak, Great Whale, La Grande, and Nelson rivers were analyzed for dissolved uranium concentration [U] and activity ratio (234U/238U). Field surveys conducted during baseflow and snowmelt in six other rivers of the HJUB basin provided complementary data. It is estimated that altogether, the studied rivers export 3.4 × 105 mol/year of U towards the HJUB, with a discharge weighted average (234U/238U) of 1.27. Two main factors appear to control seasonal fluctuations in dissolved U exports from HJUB rivers: snowmelt and anthropogenic flow control. Under natural hydrological regimes, the dilution of U caused by snowmelt does not compensate for the associated increase in discharge, and riverine U fluxes are intensified during springtime. Contrastingly, the timing of riverine U exports is decoupled from hydroclimatic conditions in rivers affected by flow-control structures. Despite the seasonal variations in riverine U contents, the sampling profiles carried along two of the monitored rivers reveal that within the study region, sample locality is at least as important as sampling time for evaluating riverine U fluxes. In addition, a compilation of data from North American rivers reveals that spatial variations in riverine U contents seem to respond to a prominent lithological control, as rivers draining sedimentary rocks (with abundant carbonates) tend to present overall higher U contents and lower (234U/238U) variability than the rivers of the Canadian Shield.
40
Rostami, Sajjad, Jianxun He, and Quazi K. Hassan. "Water quality response to river flow regime at three major rivers in Alberta." Water Quality Research Journal 55, no. 1 (2019): 79–92. http://dx.doi.org/10.2166/wqrj.2019.033.
Full textAbstract:
Abstract Both anthropogenic activities and natural factors affect river water in quantity and quality, while anthropogenic activities have been often blamed to cause water quality temporal degradation. In addition, riverine water quality displays intra-annual/seasonal variations, which are often more prominent than inter-annual variations. The intra-annual variations in water quality, which are attracting the attention of managers and policy-makers, beg the question of how to better manage riverine water quality at a finer time resolution. The natural factors, in particular, the hydro-meteorological variables, could be the primary drivers of the intra-annual variations of riverine water quality. Therefore, this paper examined the association between riverine water quality and one hydro-meteorological variable (flow) with the focus on their relationship at the intra-annual timescale on three selected rivers in Alberta, Canada. The results demonstrated that flow drives intra-annual variation of riverine water quality in general. Moreover, some water quality parameters responded to flow distinctively at three flow regimes (low, medium, and high flows). Water quality parameters were categorized into eight groups according to their responses to flow at the flow regimes. These implied the challenges in water quality management while providing insight into how to formulate more effective water management strategies.
41
Peralta-Maraver, Ignacio, Rachel Stubbington, Shai Arnon, et al. "The riverine bioreactor: An integrative perspective on biological decomposition of organic matter across riverine habitats." Science of The Total Environment 772 (June 2021): 145494. http://dx.doi.org/10.1016/j.scitotenv.2021.145494.
Full text
42
Le Fouest, V., M. Babin, and J. É. Tremblay. "The fate of riverine nutrients on Arctic shelves." Biogeosciences 10, no. 6 (2013): 3661–77. http://dx.doi.org/10.5194/bg-10-3661-2013.
Full textAbstract:
Abstract. Present and future levels of primary production (PP) in the Arctic Ocean (AO) depend on nutrient inputs to the photic zone via vertical mixing, upwelling and external sources. In this regard, the importance of horizontal river supply relative to oceanic processes is poorly constrained at the pan-Arctic scale. We compiled extensive historical (1954–2012) data on discharge and nutrient concentrations to estimate fluxes of nitrate, soluble reactive phosphate (SRP), silicate, dissolved organic carbon (DOC), dissolved organic nitrogen (DON), particulate organic nitrogen (PON) and particulate organic carbon (POC) from 9 large Arctic rivers and assess their potential impact on the biogeochemistry of shelf waters. Several key points can be emphasized from this analysis. The contribution of riverine nitrate to new PP (PPnew) is very small at the regional scale (< 1% to 6.7%) and negligible at the pan-Arctic scale (< 0.83%), in agreement with recent studies. By consuming all this nitrate, oceanic phytoplankton would be able to use only 14.3% and 8.7–24.5% of the river supply of silicate at the pan-Arctic and regional scales, respectively. Corresponding figures for SRP are 28.9% and 18.6–46%. On the Beaufort and Bering shelves, riverine SRP cannot fulfil phytoplankton requirements. On a seasonal basis, the removal of riverine nitrate, silicate and SRP would be the highest in spring and not in summer when AO shelf waters are nitrogen-limited. Riverine DON is potentially an important nitrogen source for the planktonic ecosystem in summer, when ammonium supplied through the photoammonification of refractory DON (3.9 × 109 mol N) may exceed the combined riverine supply of nitrate and ammonium (3.4 × 109 mol N). Nevertheless, overall nitrogen limitation of AO phytoplankton is expected to persist even when projected increases of riverine DON and nitrate supply are taken into account. This analysis underscores the need to better contrast oceanic nutrient supply processes with the composition and fate of changing riverine nutrient deliveries in future scenarios of plankton community structure, function and production in the coastal AO.
43
Le Fouest, V., M. Babin, and J. É. Tremblay. "The fate of riverine nutrients on Arctic shelves." Biogeosciences Discussions 9, no. 10 (2012): 13397–437. http://dx.doi.org/10.5194/bgd-9-13397-2012.
Full textAbstract:
Abstract. Present and future levels of primary production (PP) in the Arctic Ocean (AO) depend on nutrient inputs to the photic zone via vertical mixing, upwelling and external sources. In this regard, the importance of horizontal river supply relative to oceanic processes is poorly constrained at the panarctic scale. We compiled extensive historical (1954–2012) data on discharge and nutrient concentrations to estimate fluxes of nitrate, soluble reactive phosphate (SRP), silicate, DOC, DON, PON and POC from 9 large Arctic rivers and assess their potential impact on the biogeochemistry of shelf waters. Several key points can be emphasized from this analysis. The contribution of riverine nitrate to new PP (PPnew) is very small at the regional scale (< 1% to ca. 6.2%) and negligible at the panarctic scale (ca. 0.73%), in agreement with recent studies. By consuming all this nitrate, oceanic phytoplankton would be able to use only ca. 13.5% and 6.6–17.5% of the river supply of silicate at the panarctic and regional scales, respectively. Corresponding figures for SRP are ca. 27.8% and 18.4–44.4%. On the Beaufort and Bering shelves, riverine SRP cannot fulfil phytoplankton requirements. On a seasonal basis, the removal of riverine nitrate, silicate and SRP would be the highest in spring and not in summer when AO shelf waters are nitrogen-limited. Riverine DON is potentially an important nitrogen source for the planktonic ecosystem in summer, when ammonium supplied through the photoammonification of refractory DON (ca. 3.9×109 mol N) may exceed the combined riverine supply of nitrate and ammonium (ca. 2.9×109 mol N). Nevertheless, overall nitrogen limitation of AO phytoplankton is expected to persist even when projected increases of riverine DON and nitrate supply are taken into account. This analysis underscores the need to better contrast oceanic nutrient supply processes with the composition and fate of changing riverine nutrient deliveries in future scenarios of plankton community structure, function and production in the coastal AO.
44
Craig, Cody A., Jeremy D. Maikoetter, and Timothy H. Bonner. "Temperature-mediated feeding between spring-associated and riverine-associated congeners, with implications for community segregation." PeerJ 6 (January 4, 2019): e6144. http://dx.doi.org/10.7717/peerj.6144.
Full textAbstract:
Freshwater fish communities segregate along water temperature gradients attributed in part to temperature-mediated physiological processes that affect species fitness. In spring complexes of southwest USA, spring complexes with narrow range of water temperatures are dominated by a community of fishes (i.e., spring-associated fishes), whereas riverine habitats with wide-range of water temperatures are dominated by a different community of fishes (i.e., riverine-associated fishes). The purpose of this study was to test a prediction of the concept that temperature-mediated species performance is a mechanism in maintaining community segregation. We predicted that a spring-associated fish (Largespring Gambusia Gambusia geiseri) would feed first and more often in a pairing with a riverine-associated fish (Western Mosquitofish G. affinis) at an average spring temperature (23 °C) and that the riverine-associated fish would feed first and more often in a pairing with the spring-associated fish at a warm riverine temperature (30 °C). Among four trails consisting of 30 pairings, at the spring complex temperature (23 °C), Largespring Gambusia had a greater number of first feeds (mean ± 1 SD, 5.0 ± 0.82) than Western Mosquitofish (2.5 ± 1.73) and had greater mean number of total feeds (1.9 ± 0.31) than Western Mosquitofish (0.81 ± 0.70). At the riverine environment temperature (30 °C), Western Mosquitofish had a greater number of first feeds (5.25 ± 1.71) than Largespring Gambusia (2.5 ± 1.73) and had greater mean number of total feeds (2.78 ± 1.05) than Largespring Gambusia (0.94 ± 0.68). Our findings suggest that temperature-mediated species performance could be maintaining segregation between the two fish communities. This study benefits our understanding of distributional patterns and improves threat assessments of stenothermal aquatic organisms.
45
Cyberski, J., A. Wróblewski, and J. Stewart. "Riverine water inflows and the Baltic Sea water volume 1901-1990." Hydrology and Earth System Sciences 4, no. 1 (2000): 1–11. http://dx.doi.org/10.5194/hess-4-1-2000.
Full textAbstract:
Abstract. An analysis of riverine outflow into the Baltic Sea is presented for the years 1901 – 1990. The monthly outflows were calculated from the measurements in a number of representative rivers. The analysis included estimation of seasonal and multi-year characteristics of riverine outflows and periodic structure, as well as stochastic and statistical indicators characterising the influence of riverine water on the variability of the sea level and water volume in the basin. The article presents prognostic characteristics determined using analysis of parametric stochastic processes. The results obtained are related to oceanographic characteristics of the Baltic Sea. Keywords: Baltic volume; Baltic balance; river outflow; river seasonality
46
Yam, Rita S. W., Yen-Tzu Fan, Zhehan Tan, Tzu-Dan Wang, and Chiu-Yu Chiu. "Assessing Impacts of Metallic Contamination along the Tidal Gradient of a Riverine Mangrove: Multi-metal Bioaccumulation and Biomagnification of Filter-Feeding Bivalves." Forests 11, no. 5 (2020): 504. http://dx.doi.org/10.3390/f11050504.
Full textAbstract:
Most riverine mangroves (characterized by salinity fluctuations and tidal inundations), are seriously threatened by metallic pollution. Whether differences in salinity and tidal effects along the river continuum can affect metallic bioaccumulation and the biomagnification of species is still unknown. Bivalves are representative sessile inhabitants in mangrove ecosystems, with a high capacity to bioaccumulate metallic contaminants. The present study used two bivalves, Meretrix lusoria and Mytilopsis sallei, to monitor inter-site changes in metallic contamination and assess the associated ecological impacts along the tidal gradients of riverine mangroves. The concentrations of a total of six metals (Cr, Ni, Cu, Zn, Cd and Pb) in M. lusoria and M. sallei, collected at three different sites along Danshuei Riverine Mangrove, were investigated. The metallic concentrations of the whole soft body of the studied bivalves, and the associated surface sediment from each site, were analyzed using inductively coupled plasma mass spectrometry (ICP-MS) to determine the inter-site effects on the bioaccumulation and biomagnification of metallic contaminants in bivalves. There are increasing concentrations of four metallic contaminants, Zn, Cr, Cd and Cu, in the seaward direction of the bivalves. The increasing mean metallic concentrations along the seaward direction may be the effect of salinity, further decreasing the rate of the elimination of these metals, thus resulting in a net increase in metallic contaminants. Our results clearly show prominent inter-site changes in the metallic burdens of bivalves in our study on riverine mangrove ecosystems associated with different levels of bioaccumulation and biomagnification of metallic contaminants. Thus, it is important to monitor multiple sites along the dynamic environment of riverine mangroves in order to gain a good understanding of the ecological impact of metallic pollution risks. The present findings provide important evidence of the use of simple indices to assess the ecological impacts of metallic pollution in riverine mangroves.
47
Geraeds, Marlein, Tim van Emmerik, Robin de Vries, and Mohd Shahrizal bin Ab Razak. "Riverine Plastic Litter Monitoring Using Unmanned Aerial Vehicles (UAVs)." Remote Sensing 11, no. 17 (2019): 2045. http://dx.doi.org/10.3390/rs11172045.
Full textAbstract:
Plastic debris has become an abundant pollutant in marine, coastal and riverine environments, posing a large threat to aquatic life. Effective measures to mitigate and prevent marine plastic pollution require a thorough understanding of its origin and eventual fate. Several models have estimated that land-based sources are the main source of marine plastic pollution, although field data to substantiate these estimates remain limited. Current methodologies to measure riverine plastic transport require the availability of infrastructure and accessible riverbanks, but, to obtain measurements on a higher spatial and temporal scale, new monitoring methods are required. This paper presents a new methodology for quantifying riverine plastic debris using Unmanned Aerial Vehicles (UAVs), including a first application on Klang River, Malaysia. Additional plastic measurements were done in parallel with the UAV-based approach to make comparisons between the two methods. The spatiotemporal distribution of the plastics obtained with both methods show similar patterns and variations. With this, we show that UAV-based monitoring methods are a promising alternative for currently available approaches for monitoring riverine plastic transport, especially in remote and inaccessible areas.
48
Papale, Maria, Carmen Rizzo, Gabriella Caruso, et al. "Ice Melt-Induced Variations of Structural and Functional Traits of the Aquatic Microbial Community along an Arctic River (Pasvik River, Norway)." Water 13, no. 16 (2021): 2297. http://dx.doi.org/10.3390/w13162297.
Full textAbstract:
The effects of climate change-induced ice melting on the microbial communities in different glacial-fed aquatic systems have been reported, but seasonal dynamics remain poorly investigated. In this study, the structural and functional traits of the aquatic microbial community were assessed along with the hydrological and biogeochemical variation patterns of the Arctic Pasvik River under riverine and brackish conditions at the beginning (May = Ice-melt (−)) and during the ice-melting season (July = Ice-melt (+)). The microbial abundance and morphometric analysis showed a spatial diversification between the riverine and brackish stations. Results highlighted different levels of microbial respiration and activities with different carbon and phosphorous utilization pathways, thus suggesting an active biogeochemical cycling along the river especially at the beginning of the ice-melting period. At Ice-melt (−), Gammaproteobacteria and Alphaproteobacteria were dominant in riverine and brackish stations, respectively. Conversely, at Ice-melt (+), the microbial community composition was more homogeneously distributed along the river (Gammaproteobacteria > Alphaproteobacteria > Bacteroidetes). Our findings provide evidence on how riverine microbial communities adapt and respond to seasonal ice melting in glacial-fed aquatic ecosystems.
49
Hibbs, David E., Yih-Farn Chen, John S. Gulliver, and Vaughan R. Voller. "A TWO-PHASE RIVERINE SPILL MODEL." International Oil Spill Conference Proceedings 1997, no. 1 (1997): 567–71. http://dx.doi.org/10.7901/2169-3358-1997-1-567.
Full textAbstract:
ABSTRACT This paper presents a riverine spill model that computes the concentration of oil components in both the oil phase and the water phase by mathematically simulating the processes that affect the fate of the spilled oil. Processes simulated by the model include evaporation from the slick, dissolution of the slick into the water, volatilization from the water, and longitudinal dispersion in the river. The model also computes the location and size of the slick as it drifts downstream and spreads across the water surface. The model is versatile yet relatively simple and easy to use. The model requires minimum information on the river and oil, and it can be applied whenever the assumption of a laterally well-mixed river is acceptable. Most applications can be solved in several minutes on a 486-based personal computer. Sample applications show that the concentration of a compound in the water phase is strongly linked to its concentration in the oil phase and to its aqueous solubility. Concentrations in the water phase were also found to be most sensitive to variations in the dissolution rate. Concentrations were much less sensitive to variations in the volatilization rate, slick evaporation rate, and longitudinal dispersion.
50
Meyer, Judy L. "A Blackwater Perspective on Riverine Ecosystems." BioScience 40, no. 9 (1990): 643. http://dx.doi.org/10.2307/1311431.
Full text