Toxic Substances

Hansen, Anne M.; Afferden, Manfred van

doi:10.1007/978-1-4615-0545-7_4

Cited by 10 publications

(11 citation statements)

References 6 publications

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“…The lake acts as a sink for dissolved substances (e.g. heavy metals) and suspended sediments transported from up-stream agricultural, urban and industrial areas through the Lerma River and the local watershed [18].…”

Section: Study Zonementioning

confidence: 99%

Water Quality Assessment of a Tropical Mexican Lake Using Multivariate Statistical Techniques

Badillo-Camacho¹,

Reynaga-Delgado²,

Barcelo-Quintal³

et al. 2015

JEP

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Water quality of Mexican tropical lake Chapala was assessed through multivariate statistical techniques, cluster analysis (CA) and principal component analysis (PCA) at ten different monitoring sites for ten physicochemical variables and six metals. This study evaluated and interpreted complex water quality data sets and apportioned of pollution sources to get better information about water quality. From descriptive statistics results, the highest concentrations of metals occurred during the dry season, and this trend was explained by the fact that an unusual rainy event occurred during the month of February 2009 and brought metals into the lake by runoffs from nearby mountains. According to international criteria for water consumption by aquatic organisms [USEPA], only Zn concentration values were below these criteria whereas the values of Ni, Pb, Cd and Fe were above the corresponding values set in these criteria (Ni: 52 µg•L −1 , Pb: 2.5 µg•L −1 , Cd: 0.25 µg•L −1 , and Fe: 1000 µg•L −1). The correlations were observed by PCA, which were used to classify the samples by CA, based on the PCA scores. Seven significant cluster groups of sampling locations-(sites 4 and 5), (sites 3 and 9), (site 7), (site 10), (sites 2 and 6), (site 8) and (site 1)-* Corresponding author. J. Badillo-Camacho et al. 216 were detected on the basis of similarity of their water quality. The results revealed that the stress exerted on the lake caused by waste sources follows the order: domestic > agricultural > industrial.

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Section: Study Zonementioning

confidence: 99%

Water Quality Assessment of a Tropical Mexican Lake Using Multivariate Statistical Techniques

Badillo-Camacho¹,

Reynaga-Delgado²,

Barcelo-Quintal³

et al. 2015

JEP

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“…The Goodeinae constitute the most distinctive fish group in Central Mexico; yet, most of their habitat is threatened by urban, industrial, and agricultural pollutants such as benzene, xylene, phenol, and pesticides (Hansen and Afferden, 2001). The organophosphorus compound methyl parathion [MeP; O,O-dimethyl O-p-nitrophenyl phosphorothioate] is extensively used as a pesticide in developing countries.…”

Section: Introductionmentioning

confidence: 99%

Effects of methyl parathion exposure on development and reproduction in the viviparous fish Girardinichthys multiradiatus

Arellano-Aguilar

Garcı́a

2008

Environmental Toxicology

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Methyl parathion (MeP), an insecticide commonly used in Mexico, has been detected in water bodies adjacent to agricultural crops and is accumulated in the tissue of the amarillo (Girardinichthys multiradiatus), a viviparous fish unique to Central Mexico. Evidence of MeP accumulation in a G. multiradiatus population prompted assessment of the consequences of exposure to MeP during the gestation period and adult life. We exposed adult fish to MeP in the diet at concentrations ranging from 0.001 to 0.165 microg/g dry weight of food. Fish accumulated MeP at concentrations from 0.21 to 5.87 microg/g of fish and exhibited a significant reduction in weight and growth rate. We also evaluated the effects on broods of pregnant females exposed to 0.005, 0.01, and 0.1 microg/g dry weight of food. Although these pregnant females were not affected, their offspring showed an increase in spinal cord malformation and a reduction in survival to adulthood. Finally, we sampled seven localities inhabited by G. multiradiatus; this revealed the presence of MeP in two water bodies at concentrations of 0.0036 and 0.037 microg/mL respectively. Our results suggest that low MeP concentrations affect immature fish with possible consequences later in life.

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“…The model exhibits the origin of currents from the Santiago river, highlighting changes in the natural direction of the water flow explained by Fernex et al [77]. Other currents were detected from the Lerma River and La Pasión Creek, evidencing the extensive erosion processes generated in their catchments and the sediment transport to the lake [45][46][47]. However, the finding of the spatial strip along the eastern side of the lake suggests that high turbidity values in this area furthermore respond to other factors that produce a sudden increase in the horizontal rate of turbidity values at short distances.…”

Section: Model Interpretationsmentioning

confidence: 53%

“…The Lerma river carries a great amount of solids generated by erosive processes, mainly caused by poor management of soil resources [43,44]. The river also transports contaminants from upstream towns to the lake due to the agricultural, livestock and industrial activities; many of these effluents are not treated and constitute a potential threat to the ecosystem of the lake and further downstream [45,46]. La Pasión Creek is another important source of sediment, which causes turbidity in the lake [47].…”

Section: Introductionmentioning

confidence: 99%

Time Delay Evaluation on the Water-Leaving Irradiance Retrieved from Empirical Models and Satellite Imagery

et al. 2019

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Temporal delays and spatial randomness between ground-based data and satellite overpass involve important deviations between the empirical model output and real data; these are factors poorly considered in the model calibration. The inorganic matter-generated turbidity in Lake Chapala (Mexico) was taken as a study case to expose the influence of such factors. Ground-based data from this study and historical records were used as references. We take advantage of the at-surface reflectance from Landsat-8, sun-glint corrections, a reduced NIR-band range, and null organic matter incidence in these wavelengths to diminish the physical phenomena-related radiometric artifacts; leaving the spatio-temporal relationships as the principal factor inducing the model uncertainty. Non-linear correlations were assessed to calibrate the best empirical model; none of them presented a strong relationship (<73%), including that based on hourly delays. This last model had the best predictability only for the summer-fall season, explaining 71% of the turbidity variation in 2016, and 59% in 2017, with RMSEs < 24%. The instantaneous turbidity maps depicted the hydrodynamic complexity of the lake, highlighting a strong component of spatial randomness associated with the temporal delays. Reasonably, robust empirical models will be developed if several dates and sampling-sites are synchronized with more satellite overpasses.

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Toxic Substances

Cited by 10 publications

References 6 publications

Water Quality Assessment of a Tropical Mexican Lake Using Multivariate Statistical Techniques

Water Quality Assessment of a Tropical Mexican Lake Using Multivariate Statistical Techniques

Effects of methyl parathion exposure on development and reproduction in the viviparous fish Girardinichthys multiradiatus

Time Delay Evaluation on the Water-Leaving Irradiance Retrieved from Empirical Models and Satellite Imagery

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