Mercury in the Aquatic Environment of the Village of Caimito at the Mojana Region, North of Colombia

Olívero-Verbel, Jesús; Johnson‐Restrepo, Boris; Mendoza-Marín, Claudia; Paz-Martinez, Ramon; Olivero-Verbel, Rafael

doi:10.1023/b:wate.0000049162.54404.76

Cited by 37 publications

(15 citation statements)

References 40 publications

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“…The Magdalena River is impacted by agricultural effluents, especially coffee farms, in Garzon; municipal and industrial discharges wastewaters from capital cities in Neiva and Barranquilla; and gold mining activities near Simiti and El Banco (Olivero-Verbel et al, 1995, 2004. Some studies have reported growth inhibition on C. elegans exposed to soil and river sediments.…”

Section: Growthmentioning

confidence: 99%

“…The relatively high levels of those metals are likely the result of anthropogenic activities carried out in the river basin, including gold mining (Olivero-Verbel et al, 1995, 2004, petrochemical, and fluvial transportation, agriculture, and municipal and industrial wastewater across the Magdalena River. The association between distance from the first sampling site and survival, growth, and locomotion inhibition is presented in Figure SM-8.…”

Section: Multivariate Analysis 331 Correlation Between Chemical Anmentioning

confidence: 99%

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Pollution by metals and toxicity assessment using Caenorhabditis elegans in sediments from the Magdalena River, Colombia

Benítez

Flegal

Odigie

et al. 2016

Environmental Pollution

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a b s t r a c tThe Magdalena River is the most important river in Colombia, supplying over 70% of the population of fish and drinking water, and it also is the main river transportation way of the country. It receives effluents from multiple sources along its course such as contaminant agricultural and industrial discharges. To evaluate the toxicity profile of Magdalena River sediments through endpoints such as survival, locomotion, and growth, wild type strains of Caenorhabditis elegans were exposed to aqueous extracts of the sediments. To identify changes in gene expression, GFP transgenic strains were used as reporter genes. Physiological and biochemical data were correlated with metal concentration in the sediments, identifying patterns of toxicity along the course of the river. Levels of some metals such as Cd, Cu, and Ni were above TEC and PEC limits. Effects in survival, growth, and locomotion were observed in most of the samples, and changes in gene expression were evident in the genes mtl-2, sod-4, and gst-1 using fluorescence expression. Cadmium and lead were the metals which were primarily associated with sediment toxicity, and the sampling sites with the highest increased expression of stress response genes were Barrancabermeja and Girardot. However, the diverse nature of toxic profiles observed in C. elegans in the study area showed the pervasiveness of different types of discharges throughout the river system.

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Section: Growthmentioning

confidence: 99%

Section: Multivariate Analysis 331 Correlation Between Chemical Anmentioning

confidence: 99%

Pollution by metals and toxicity assessment using Caenorhabditis elegans in sediments from the Magdalena River, Colombia

Benítez

Flegal

Odigie

et al. 2016

Environmental Pollution

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“…It was not possible to obtain samples from a reference site, because Hg contamination occurs throughout the Magdalena River drainage (Olivero-Verbel et al, 2004;Alvarez et al, 2012;Rúa et al, 2013). Mean clutch size was 8.4 eggs, comparable to reports of 9.5 eggs (Cortés-Duque, 2009) and 11 eggs (Bernal et al, 2004;Restrepo et al, 2007) per clutch on average in other locations.…”

Section: Methodsmentioning

confidence: 99%

MERCURY LEVELS IN EGGS, EMBRYOS, AND NEONATES OF Trachemys callirostris (TESTUDINES, EMYDIDAE).

Rendón-Valencia¹,

García²,

Bock³

et al. 2014

Acta biol. colomb.

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RESUMENCuantificamos la concentración total de mercurio en cáscaras, yemas y embriones de 16 nidos de hicotea (Trachemys callirostris). Los nidos fueron colectados en diferentes estadios de desarrollo embrionario. No hubo una correlación entre el tiempo estimado desde el desove y los niveles de mercurio en los huevos, sugiriendo que el metal no fue absorbido del substrato, sino que probablemente éste fue transferido a los huevos durante el proceso de foliculogénesis en las hembras reproductivas, las cuales bioacumularon el mercurio de fuentes ambientales. La concentración promedio de mercurio fue mayor en los embriones que en las cáscaras o yemas, indicando que los embriones también bioacumulan el metal presente en otros tejidos del huevo. La variación de la concentración de mercurio dentro de una misma nidada fue relativamente alta. Las concentraciones de mercurio en las yemas no estuvieron asociadas con ninguna de las medidas de fitness que fueron evaluadas (éxito de eclosión, tamaño inicial de los neonatos y tasas de crecimiento de los juveniles en el primer mes). Después de cinco meses de mantenimiento en cautiverio, en un ambiente libre de mercurio, 86 % de los juveniles había eliminado completamente este metal de sus tejidos.Palabras clave: bioacumulación, hicotea, mercurio, metales pesados, yema. ABSTRACTWe quantified total mercury concentrations in eggshells, egg yolks, and embryos from 16 nests of the Colombian Slider (Trachemys callirostris). Nests were collected in different stages of development, but estimated time of incubation in natural substrates was not correlated with mercury levels in the eggs, suggesting that mercury was not absorbed from the substrate, but more likely passed on to the embryos during folliculogenesis by the reproductive females who had bioaccumulated the mercury from environmental sources. Mean mercury concentrations were higher in embryos than in eggshells or egg yolks, indicating that embryos also bioaccumulate mercury present in other egg tissues. Intra-clutch variation in egg yolk mercury concentrations was relatively high. Egg yolk mercury concentrations were not associated with any of the fitness proxies we quantified for the nests (hatching success rates, initial neonate sizes and first-month juvenile growth rates). After five months of captive rearing in a mercury-free laboratory environment, 86 % of the juveniles had eliminated the mercury from their tissues.

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“…This vast basin is going to be affected by a number of significant processes: Land use change in the river basin: this is a process which possibly already touched its apex, but it is still going on (particularly deforestation and urbanization more or less un-controlled) and whose consequences-particularly the increment of sediment load to rivers-are on-going [31][32][33]; this is accompanied by industrial and illegal mining development and its proved toxic consequences [34][35][36][37][38][39][40][41]; 3.…”

Section: The Planned Futurementioning

confidence: 99%

A Qualitative Hydro-Geomorphic Prediction of the Destiny of the Mojana Region (Magdalena-Cauca Basin, Colombia), to Inform Large Scale Decision Making

Nardini¹,

Idarraga

2016

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Abstract:Colombia is undergoing a period of rapid development. In particular, the Magdalena-Cauca Rivers basin, and the Mojana region within it, is going to experience rapid expansion in infrastructure growth, entailing hydropower development, road and navigability works along hundreds of kilometers of channels, as well as standard flood control measures. This paper argues that unexpected and undesired outcomes are very likely to occur as a consequence of the hydraulic and geomorphological reaction of river systems to such development schemes; namely, we foresee heightened hydro-morphological risks, along with the loss of environmental services and strong increases in maintenance costs. River behavior has been the subject of extensive study by diverse disciplines. As a result, key principles of fluvial dynamics have been elucidated and specific quantitative prediction tools developed. In this paper we do rely on this wealth of knowledge. However, since specific local information and interpretative tools in Colombia are either lacking or unreliable, it is inevitable that, at the moment, any basin scale analysis has to remain qualitative and must incorporate several assumptions, leaving it open to questioning and further refinement. Nonetheless, we argue that advancing such type of speculative conjectures is the "right thing to do". The undeniably desirable but hard to achieve alternative of waiting for sufficient datasets and tools would entail excessive delay in obtaining relevant answers while large-scale development would continue to occur with potentially damaging results. Therefore, our analysis is conceived along the precautionary principle. This paper is primarily aimed at technical advisors of policy makers as it offers scientifically-based arguments for informing the political debate, hopefully guiding decision makers towards better choices. Rather than advocating specific solutions, the focus is on pointing out the likely adverse consequences of the currently planned course of action.

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Mercury in the Aquatic Environment of the Village of Caimito at the Mojana Region, North of Colombia

Cited by 37 publications

References 40 publications

Pollution by metals and toxicity assessment using Caenorhabditis elegans in sediments from the Magdalena River, Colombia

Pollution by metals and toxicity assessment using Caenorhabditis elegans in sediments from the Magdalena River, Colombia

MERCURY LEVELS IN EGGS, EMBRYOS, AND NEONATES OF Trachemys callirostris (TESTUDINES, EMYDIDAE).

A Qualitative Hydro-Geomorphic Prediction of the Destiny of the Mojana Region (Magdalena-Cauca Basin, Colombia), to Inform Large Scale Decision Making

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