Variation of stomach content and isotopic niche of puye Galaxias maculatus (Jenyns, 1842) in large river systems of southern Chile

2021 ◽  
Author(s):  
Aliro J. Manosalva ◽  
Stefanía Pérez ◽  
Bárbara Toledo ◽  
Nicole Colin ◽  
Evelyn M. Habit ◽  
...  
Keyword(s):  
Stomach Content ◽  
Large River ◽  
Isotopic Niche ◽  
Southern Chile ◽  
River Systems ◽  
Galaxias Maculatus

scholarly journals River Water Quality of the Selenga-Baikal Basin: Part II—Metal Partitioning under Different Hydroclimatic Conditions

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2392
Author(s):  
Nikolay Kasimov ◽  
Galina Shinkareva ◽  
Mikhail Lychagin ◽  
Sergey Chalov ◽  
Margarita Pashkina ◽  
...  
Keyword(s):  
River Basin ◽  
Large River ◽  
Metal Partitioning ◽  
River Systems ◽  
Catchment Scale ◽  
Selenga River Basin ◽  
Extensive Field ◽  
Basin Scale ◽  
Wide Range ◽  
Dissolved Form

The partitioning of metals and metalloids between their dissolved and suspended forms in river systems largely governs their mobility and bioavailability. However, most of the existing knowledge about catchment-scale metal partitioning in river systems is based on a limited number of observation points, which is not sufficient to characterize the complexity of large river systems. Here we present an extensive field-based dataset, composed of multi-year data from over 100 monitoring locations distributed over the large, transboundary Selenga River basin (of Russia and Mongolia), sampled during different hydrological seasons. The aim is to investigate on the basin scale, the influence of different hydroclimatic conditions on metal partitioning and transport. Our results showed that the investigated metals exhibited a wide range of different behaviors. Some metals were mostly found in the dissolved form (84–96% of Mo, U, B, and Sb on an average), whereas many others predominantly existed in suspension (66–87% of Al, Fe, Mn, Pb, Co, and Bi). Nevertheless, our results also showed a consistently increasing share of metals in dissolved form as the metals were transported to the downstream parts of the basin, closer to the Lake Baikal. Under high discharge conditions (including floods), metal transport by suspended particulate matter was significantly greater (about 2–6 times). However, since high and low water conditions could prevail simultaneously at a given point of time within the large river basin, e.g., as a result of on-going flood propagation, snap-shot observations of metal partitioning demonstrated contrasting patterns with domination of both particulate and dissolved phases in different parts of the basin. Such heterogeneity of metal partitioning is likely to be found in many large river systems. These results point out the importance of looking into different hydroclimatic conditions across space and time, both for management purposes and contaminant modeling efforts at the basin scale.

Current research status of large river systems: a cross-continental comparison

2020 ◽  
Vol 27 (31) ◽  
pp. 39413-39426 ◽  
Author(s):  
Wan Su ◽  
Juan Tao ◽  
Jun Wang ◽  
Chengzhi Ding
Keyword(s):  
Large River ◽  
River Systems ◽  
Research Status

The Mini-Missouri Trawl: A Useful Methodology for Sampling Small-Bodied Fishes in Small and Large River Systems

2009 ◽  
Vol 24 (1) ◽  
pp. 103-108 ◽  
Author(s):  
David P. Herzog ◽  
David E. Ostendorf ◽  
Robert A. Hrabik ◽  
Valerie A. Barko
Keyword(s):  
Large River ◽  
River Systems

The reversible process concept applied to the environmental management of large river systems

1987 ◽  
Vol 11 (5) ◽  
pp. 607-617 ◽  
Author(s):  
Claude Amoros ◽  
Jean -Claude Rostan ◽  
Guy Pautou ◽  
Jean -Paul Bravard
Keyword(s):  
Environmental Management ◽  
Large River ◽  
River Systems ◽  
Reversible Process

Large barchanoid dunes in the Amazon River and the rock record: Implications for interpreting large river systems

2016 ◽  
Vol 454 ◽  
pp. 92-102 ◽  
Author(s):  
Renato Paes de Almeida ◽  
Cristiano Padalino Galeazzi ◽  
Bernardo Tavares Freitas ◽  
Liliane Janikian ◽  
Marco Ianniruberto ◽  
...  
Keyword(s):  
Large River ◽  
Amazon River ◽  
River Systems ◽  
Rock Record

scholarly journals The challenge of reconstructing human impact on large river systems

PAGES news ◽  
2007 ◽  
Vol 15 (1) ◽  
pp. 21-23 ◽  
Author(s):  
Thomas Hoffmann ◽  
A Lang ◽  
R Dikau
Keyword(s):  
Human Impact ◽  
Large River ◽  
River Systems

scholarly journals The potential of small mountain river systems for paleoenvironmental reconstructions in drylands - An example from the Binaloud Mountains in northeastern Iran

2021 ◽  
Author(s):  
Azra Khosravichenar ◽  
Morteza Fattahi ◽  
Hamideh Amini ◽  
Hans von Suchodoletz
Keyword(s):  
River System ◽  
Large River ◽  
Alluvial Fan ◽  
Small Rivers ◽  
River Systems ◽  
Mountain Ranges ◽  
Geomorphological Mapping ◽  
Fluvial Dynamics ◽  
Local Tectonics ◽  
Numerical Dating

<p>Fluvial sediments are valuable paleoenvironmental archives of the Quaternary. Since besides environmental factors they are also affected by local tectonics or intrinsic processes, large instead of small catchments should be studied. In drylands covering ca. 45% of the global terrestrial surface large river systems are generally missing, and most river systems are small rivers originating from mountain ranges. Their sediments are potentially interesting paleoenvironmental archives, but are often affected by intensive tectonics. During this study, to obtain a robust regional paleoenvironmental signal a small river system in the southwestern Binaloud Mountains in semi-arid NE Iran was exemplarily studied with a combined approach that encompassed both alluvial fan and catchment. By using geomorphological mapping and numerical dating, fluvial aggradation followed by incision was independently identified in larger areas or in different parts of the river system ca. 95–88 ka, 40 ka, 20 ka, around/after the Pleistocene/Holocene transition and possibly ca. 2.6 ka. These could be linked with regional and over-regional paleoenvironmental data. Furthermore, large boulders on the alluvial fan suggest anthropogenic destabilisation of the catchment during the last decades. Despite strong local tectonics the fluvial dynamics was mostly controlled by paleoenvironmental changes and human activity. This indicates that despite their small size, such river systems form valuable paleoenvironmental archives in drylands where other archive types are largely missing. </p>

Environmental monitoring of riverine plastic contamination in Asia

2021 ◽  
Author(s):  
Marianne Olsen ◽  
Rachel Hurley ◽  
Nina Buenaventura ◽  
David Eidsvoll ◽  
Hans Fredrik Braaten ◽  
...  
Keyword(s):  
Environmental Monitoring ◽  
Social Science Research ◽  
Science Research ◽  
Large River ◽  
Plastic Waste ◽  
Considerable Proportion ◽  
Monitoring Methods ◽  
River Systems ◽  
Routine Monitoring ◽  
Asean Countries

<p>Rivers have been identified as an important pathway for the release of plastic waste to the oceans, connecting land-based sources to the marine environment. Asian rivers, in particular, have been highlighted by several published studies as contributing a considerable proportion of global macro- and microplastic release. To evaluate this, several parallel projects (ASEANO, SINOPLAST, INOPOL) have commenced environmental monitoring of riverine plastic contamination in China, India, and several ASEAN countries. Monitoring is being undertaken in selected study catchments, which have been identified based on their geographical context and their relevance to global plastic contamination. They include several rivers that have been reported as being amongst the most contaminating systems in the world. Macroplastic flows in the active river channel will be assessed, as well as the role of the riverbank zone in the storage and transport of plastic waste. Monitoring of riverine microplastic contamination will also be included in some countries. The aims of this environmental monitoring is to: i) provide estimates for the flux of plastics to the ocean; ii) identify appropriate and optimum methods for routine monitoring of riverine plastic contamination; iii) supply qualitative and quantitative data on macroplastic flows and contamination to support social science research that is also taking place within these river catchments; and iv) provide data for the calibration and validation of riverine plastic transport models.</p><p>This presentation will give an overview of monitoring plans and preliminary findings and experiences from these ongoing projects. This will include a discussion about the ways in which monitoring methods have been adapted to river systems with different morphologies and flow regimes, and to satisfy different research questions across the projects. The complexities associated with undertaking environmental monitoring in large river systems will also be addressed.</p>

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