scholarly journals River lives, River movements. Fisher communities mobilizing local and official rules in defense of the Magdalena River

2021 ◽  
Vol 53 (3) ◽  
pp. 458-476
Author(s):  
Rutgerd Boelens ◽  
Juliana Forigua-Sandoval ◽  
Bibiana Duarte-Abadía ◽  
Juan Carlos Gutiérrez-Camargo
Keyword(s):  
Magdalena River

scholarly journals The Rise of Climate-Driven Sediment Discharge in the Amazonian River Basin

Atmosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 208 ◽  
Author(s):  
Nazzareno Diodato ◽  
Naziano Filizola ◽  
Pasquale Borrelli ◽  
Panos Panagos ◽  
Gianni Bellocchi
Keyword(s):  
River Basin ◽  
Amazon Basin ◽  
Global Climate ◽  
Climate Extremes ◽  
Temporal Variations ◽  
Sediment Discharge ◽  
Storm Events ◽  
Discharge Data ◽  
Magdalena River ◽  
Sediment Export

The occurrence of hydrological extremes in the Amazon region and the associated sediment loss during rainfall events are key features in the global climate system. Climate extremes alter the sediment and carbon balance but the ecological consequences of such changes are poorly understood in this region. With the aim of examining the interactions between precipitation and landscape-scale controls of sediment export from the Amazon basin, we developed a parsimonious hydro-climatological model on a multi-year series (1997–2014) of sediment discharge data taken at the outlet of Óbidos (Brazil) watershed (the narrowest and swiftest part of the Amazon River). The calibrated model (correlation coefficient equal to 0.84) captured the sediment load variability of an independent dataset from a different watershed (the Magdalena River basin), and performed better than three alternative approaches. Our model captured the interdecadal variability and the long-term patterns of sediment export. In our reconstruction of yearly sediment discharge over 1859–2014, we observed that landscape erosion changes are mostly induced by single storm events, and result from coupled effects of droughts and storms over long time scales. By quantifying temporal variations in the sediment produced by weathering, this analysis enables a new understanding of the linkage between climate forcing and river response, which drives sediment dynamics in the Amazon basin.

scholarly journals Effect of Restoration Actions on Organic Carbon Pools in the Lagoon—Delta Ciénaga Grande de Santa Marta, Colombian Caribbean

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1297
Author(s):  
Laura Victoria Perdomo-Trujillo ◽  
Jose Ernesto Mancera-Pineda ◽  
Jairo Humberto Medina-Calderón ◽  
David Alejandro Sánchez-Núñez ◽  
Marie-Luise Schnetter
Keyword(s):  
Organic Matter Content ◽  
Matter Content ◽  
Partial Recovery ◽  
Management Intervention ◽  
Management Measures ◽  
C Stocks ◽  
C Stock ◽  
Magdalena River ◽  
Indirect Relationship ◽  
Mangrove Degradation

Mangroves provide multiple ecosystem services and are essential for mitigating global warming owing to their capacity to store large carbon (C) stocks. Due to widespread mangrove degradation, actions have been implemented to restore them worldwide. An important representative case in Colombia is the Ciénaga Grande de Santa Marta’s restoration plan. This management intervention focused on restoring the natural hydrological functioning after massive mangrove mortality (~25,000 ha) due to soil hyper-salinization after river water input from the Magdalena River was eliminated. A partial recovery occurred during subsequent years, and hydrological management is still being implemented today. To understand how the degradation and subsequent management have affected mangrove C stocks, we compared C stocks in stands with different intervention levels reflected in their current forest structure. We found that the total C stock (398–1160 Mg C ha−1) was within the range measured in other neotropical mangroves without vegetation deterioration. The aboveground C was significantly higher in the stands where hydraulic connectivity was restored. By contrast, the belowground C was higher in the stands with low hydraulic connectivity due to channel clogging and a lack of sufficient maintenance. Our results show that hydrological management measures influenced above- and belowground C stocks, even at a 2 m depth. In addition, a strong indirect relationship useful for estimating carbon content from organic matter content was found.

A case of two spellings for Humboldt’s blue-winged mosquito (Diptera: Culicidae)

Zootaxa ◽  
2021 ◽  
Vol 4974 (1) ◽  
pp. 191-192
Author(s):  
RALPH E. HARBACH ◽  
NEAL L. EVENHUIS
Keyword(s):  
Mosquito Species ◽  
Know How ◽  
The Past ◽  
The Poor ◽  
Magdalena River ◽  
Perceived Color ◽  
Dark Blue

While adding taxon names to the Systema Dipterorum database (Evenhuis & Pape 2021), one of us (NLE) discovered that Humboldt (1819) had spelled the proposed name of a nominal mosquito species in two ways. He described the species, which was found in swampy places along the Magdalena River near Tenerife, Colombia, as Culex cyanopennis on page 340 and afterwards referred to it as Culex cyanopterus on pages 345 and 349. Both names have the same meaning: cyano- (Gr. kyanos, dark blue), pennis (L. penna, feather, wing) and pteron (Gr. feather, wing). The species was named for the perceived color of the wings: “Alæ cæruleæ, splendore semi-metallico…” (wings blue, a bright semi-metallic). On page 345, Humboldt states, translated from the French: “We have been informed in the Rio de la Magdalena that in Simitì no other Culex than the jejen [je·jén: Sp., gnat, mosquito] was known in the past. You can spend the night there quietly, because the jejen is not a nocturnal insect. Since the year 1801, the big blue-winged mosquito (Culex cyanopterus) has shown itself in such abundance that the poor inhabitants of Simitì do not know how to get a peaceful sleep.” Thus, in addition to having the same meaning, the two names are associated with the same locality. 

Evidence of river flow regulation loss over time in the Magdalena river basin 

2021 ◽  
Author(s):  
Diver E. Marín ◽  
Juan F. Salazar ◽  
José A. Posada-Marín
Keyword(s):  
Climate Change ◽  
Environmental Change ◽  
River Basin ◽  
River Flow ◽  
Southern Oscillation ◽  
Scaling Theory ◽  
Scaling Properties ◽  
Low Flows ◽  
High Flows ◽  
Magdalena River

<p>Some of the main problems in hydrological sciences are related to how and why river flows change as a result of environmental change, and what are the corresponding implications for society. This has been described as the Panta Rhei context, which refers to the challenge of understanding and quantifying hydrological dynamics in a changing environment, i.e. under the influence of non-stationary effects. The river flow regime in a basin is the result of a complex aggregation process that has been studied by the scaling theory, which allows river basins to be classified as regulated or unregulated and to identify a critical threshold between these states. Regulation is defined here as the basin’s capacity to either dampen high flows or to enhance low flows. This capacity depends on how basins store and release water through time, which in turn depends on many processes that are highly dynamic and sensitive to environmental change. Here we focus on the Magdalena river basin in northwestern South America, which is the main basin for water and energy security in Colombia, and at the same time, it has been identified as one of the most vulnerable regions to be affected by climate change. Building upon some of our previous studies, here we use data analysis to study the evolution of regulation in the Magdalena basin for 1992-2015 based on the scaling theory for extreme flows. In contrast to most previous studies, here we focus on the scaling properties of events rather than on long term averages. We discuss possible relations between changes in the scaling properties and environmental factors such as climate variability, climate change, and land use/land cover change, as well as the potential implications for water security in the country. Our results show that, during the last few decades, the Magdalena river basin has maintained its capacity to regulate low flows (i.e. amplification) whereas it has been losing its capacity to regulate high flows (i.e. dampening), which could be associated with the occurrence of the extremes phases of  El Niño Southern Oscillation (ENSO) and anthropogenic effects, mainly deforestation. These results provide foundations for using the scaling laws as empirical tools for understanding temporal changes of hydrological regulation and simultaneously generate useful scientific evidence that allows stakeholders to take decisions related to water management in the Magdalena river basin in the context of environmental change.</p>

scholarly journals Breeding sites of Culicoides pachymerus Lutz in the Magdalena River basin, Colombia

2010 ◽  
Vol 105 (2) ◽  
pp. 216-219 ◽  
Author(s):  
María Cristina Carrasquilla ◽  
Felipe Guhl ◽  
Yaneth Zipa ◽  
Cristina Ferro ◽  
Raúl Hernando Pardo ◽  
...  
Keyword(s):  
River Basin ◽  
Breeding Sites ◽  
Magdalena River

scholarly journals Potential and analysis of an osmotic power plant in the Magdalena River using experimental field-data

Energy ◽  
2019 ◽  
Vol 180 ◽  
pp. 548-555 ◽  
Author(s):  
Jacobo M. Salamanca ◽  
Oscar Álvarez-Silva ◽  
Fernando Tadeo
Keyword(s):  
Power Plant ◽  
Field Data ◽  
Experimental Field ◽  
Magdalena River

scholarly journals Taxonomic review of Colombian Parodon (Characiformes: Parodontidae), with descriptions of three new species

2011 ◽  
Vol 9 (4) ◽  
pp. 709-730 ◽  
Author(s):  
Alejandro Londoño-Burbano ◽  
César Román-Valencia ◽  
Donald C. Taphorn
Keyword(s):  
New Species ◽  
River Basin ◽  
Morphological Characters ◽  
Valid Species ◽  
Type Specimens ◽  
River Drainage ◽  
Distribution Maps ◽  
Maracaibo Basin ◽  
Three New Species ◽  
Magdalena River

We review species of Parodon Valenciennes, 1850 from the Magdalena, Cauca, Orinoco, Amazonas, Atrato and Caribbean-Guajira River basins of Colombia using meristic and morphological characters. We recognize eight valid species, five previously described: P. apolinari Myers, from the Orinoco River basin; P. buckleyi Boulenger and P. pongoensis (Allen) from the upper Amazon; P. caliensis Boulenger, from the upper Cauca River drainage; and P. suborbitalis Valenciennes, from Lake Maracaibo basin. Three new species are described: P. alfonsoi, from the lower Magdalena River drainage; P. magdalenensis, from the middle Magdalena and upper Cauca River drainages; and P. atratoensis, from the Atrato River basin. We redescribe Parodon suborbitalis using type specimens and topotypes, and designate lectotypes. A taxonomic key is included for identification of the species, as well as geographic distribution maps.

scholarly journals Logistic platform placement for harmonious development of the nation’s intermodal network

2018 ◽  
Vol 12 (23) ◽  
pp. 81
Author(s):  
Rafael Arevalo Ascanio ◽  
Rafael Santofimio Rivera ◽  
Jair Eduardo Rocha González ◽  
Wilson Adarme Jaimes
Keyword(s):  
Programming Model ◽  
Optimal Location ◽  
Caribbean Region ◽  
Intermodal Transport ◽  
Cargo Transport ◽  
Mixed Programming ◽  
Aggregation And Disaggregation ◽  
The Caribbean ◽  
Magdalena River ◽  
The Cost

This article considers the problem of locating multiple installations for the intermodal transport network in Colombia, and is based on the analysis of the transport of cargo from the main generating cities to the three most important port cities in the Caribbean region of the country: Barranquilla, Cartagena and Santa Marta; integrating the modes of transport by land, road and river. According to this, land transport by road is used from the source of cargo to the possible locations of the logistic platforms, and then the Magdalena River basin is used as a unique river corridor. The model proposed consists of determining the optimal location of a series of logistic platforms that guarantee a system of integration and cooperation in transport strategies for the country, in which aggregation and disaggregation of freight operations will be possible. In this aspect, an entire mixed programming model is performed with the objective of minimizing the total costs of transport and operation of the new intermodal network, with restrictions associated with the generation and processing of cargo, obtaining results in the cost functions related to cargo transport and leaving as evidence the potential of integrating intermodal transport for the country's competitiveness. 

Sign in / Sign up

Export Citation Format

Share Document