Assessment of benthic changes during 20 years of monitoring the Mexican Salina Cruz Bay

González‐Macías, C.; Schifter, I.; Lluch‐Cota, Daniel B.; Méndez-Rodríguez, Lía Celina; Hernández‐Vázquez, Salvador

doi:10.1007/s10661-008-0187-8

Cited by 5 publications

(2 citation statements)

References 48 publications

(50 reference statements)

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“…La contaminación puede medirse a través de indicadores simples obtenidos de la columna de agua, los sedimentos o los organismos bentónicos. Sin embargo, está ampliamente demostrado que tales indicadores, considerados individualmente, no siempre son suficientes o confiables para detectar un cambio producido por la contaminación (González-Macías et al, 2009;Brack et al, 2016;Vethaak et al, 2017). Tampoco pueden evidenciar los complejos fenómenos de interacciones entre los componentes abióticos y bióticos del ecosistema sujeto a impacto ambiental.…”

Section: Discussionunclassified

Caracterización físico-química y biológica de sedimentos marino costeros, sujetos o no a actividades antropogénicas (Golfo Nuevo, Patagonia argentina)

Ferrando

Lompré

2020

RMLP

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El impacto causado por las embarcaciones en los puertos es un problema a nivel mundial debido al tráfico marítimo y el vertido de aguas residuales con un alto contenido orgánico. El objetivo de este trabajo fue caracterizar un sitio afectado crónicamente por actividades portuarias (Muelle Luis Piedrabuena-MLP) y otro sin signos de impacto antrópico (Cerro Avanzado-CA). Para ello, se colectaron muestras de sedimento (n=3) con un corer (diámetro: 11 cm, altura: 15 cm) y se realizó la determinación de parámetros físico-químicos in situ en el agua adyacente. Las columnas sedimentarias fueron fraccionadas en tres secciones (0-2 cm; 2-4 cm y 4-10 cm). Los resultados granulométricos indicaron un predominio de la fracción limo fino-medio en MLP y de arena muy fina en CA. A su vez, se registraron mayores porcentajes de humedad y materia orgánica en MLP cerca de la superficie (46,7±4,1% y 2,8±0,2% versus 27,0±1,0% y 1,2±0,3% en profundidad, respectivamente), mientras que en CA la distribución de estos parámetros fue homogénea (28,5±1,2% y 1,5±0,1%, respectivamente). Con respecto a los análisis biológicos, la clase Polychaeta fue la más abundante en ambos sitios, seguido de Amphipoda en MLP y Bivalvia en CA. A su vez, la mayor abundancia de organismos fue registrada en los primeros 2 cm de la columna sedimentaria en ambos sitios. Los resultados constituyen una línea de base que podrá ser utilizada en estudios ecotoxicológicos y de monitoreo en Patagonia o en otros ambientes con características ecológicas similares.

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Section: Discussionunclassified

Caracterización físico-química y biológica de sedimentos marino costeros, sujetos o no a actividades antropogénicas (Golfo Nuevo, Patagonia argentina)

Ferrando

Lompré

2020

RMLP

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“…More recently, an assessment of the impact of organic compounds in the macro infaunal component of the mollusks benthic community of the Bay was performed (González-Macías et al 2008). The major objective of the current study was to determine potential environmental impacts to aquatic biota in the La Ventosa Estuarine System that may be linked to the presence of PAHs from the effluents of the Salina Cruz refinery.…”

Section: Introductionmentioning

confidence: 99%

Weighing the evidence of ecological risk from PAHs contamination in the estuarine environment of Salina Cruz Bay, México

Salazar‐Coria

Schifter

González‐Macías

2009

Environ Monit Assess

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Results of bulk-phase chemical measurements, toxicological tests combined with bioaccumulation measures in fishes, were used to evaluate the toxicity of the 16 USEPA priority polycyclic aromatic hydrocarbons from the sediment collected from eight stations of the Ventosa Estuarine System, located close to the main center of processing oil in the Mexican Pacific coast. Levels of the sum of polycyclic aromatic hydrocarbons varied from 22 to 6,850 microg kg(-1) dry weight. Based on sediment quality guidelines, the compounds with high environmental priority were acenaphtylene, acenaphtene, and phenanthrene. Acute toxicity tests with Vibrio fischeri and Daphnia magna as well as chronic toxicity with Panagrellus redivivus were performed. The quantification of hepatic ethoxyresorufin O-deethylase activity was used to assess the induction of the mixed function oxygenase system of brown trout. However, because it is often difficult to blend the results from such very different assays into a unified decision about the potential for impacts, a weight-of-evidence (WOE) approach to sediment quality investigations was followed. These assays provided measurement endpoints that could be used to develop an overall evaluation of the potential for environmental impacts from the oil processing operations. WOE provides a valuable tool for assessing the results of environmental investigations because it provides a framework for considering the strengths and weaknesses of environmental measurements, an approach for addressing uncertainty in the measurements, and documentation of the evaluation and its assumptions.

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Application of the positive matrix factorization approach to identify heavy metal sources in sediments. A case study on the Mexican Pacific Coast

González‐Macías

Sanchez–Reyna

Salazar‐Coria

et al. 2013

Environ Monit Assess

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During the last two decades, sediments collected in different sources of water bodies of the Tehuantepec Basin, located in the southeast of the Mexican Pacific Coast, showed that concentrations of heavy metals may pose a risk to the environment and human health. The extractable organic matter, geoaccumulation index, and enrichment factors were quantified for arsenic, cadmium, copper, chromium, nickel, lead, vanadium, zinc, and the fine-grained sediment fraction. The non-parametric SiZer method was applied to assess the statistical significance of the reconstructed metal variation along time. This inference method appears to be particularly natural and well suited to temperature and other environmental reconstructions. In this approach, a collection of smooth of the reconstructed metal concentrations is considered simultaneously, and inferences about the significance of the metal trends can be made with respect to time. Hence, the database represents a consolidated set of available and validated water and sediment data of an urban industrialized area, which is very useful as case study site. The positive matrix factorization approach was used in identification and source apportionment of the anthropogenic heavy metals in the sediments. Regionally, metals and organic matter are depleted relative to crustal abundance in a range of 45-55 %, while there is an inorganic enrichment from lithogenous/anthropogenic sources of around 40 %. Only extractable organic matter, Pb, As, and Cd can be related with non-crustal sources, suggesting that additional input cannot be explained by local runoff or erosion processes.

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Assessment of benthic changes during 20 years of monitoring the Mexican Salina Cruz Bay

Cited by 5 publications

References 48 publications

Caracterización físico-química y biológica de sedimentos marino costeros, sujetos o no a actividades antropogénicas (Golfo Nuevo, Patagonia argentina)

Caracterización físico-química y biológica de sedimentos marino costeros, sujetos o no a actividades antropogénicas (Golfo Nuevo, Patagonia argentina)

Weighing the evidence of ecological risk from PAHs contamination in the estuarine environment of Salina Cruz Bay, México

Application of the positive matrix factorization approach to identify heavy metal sources in sediments. A case study on the Mexican Pacific Coast

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