Diatomeas y calidad del agua de los ríos del Macizo Central Gallego (Ourense, N.O. Espana) mediante la aplicación de índices diatomológicos

Penalta-Rodríguez, María; López-Rodríguez, Ma Carmen

doi:10.23818/limn.26.30

Cited by 4 publications

(1 citation statement)

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“…La utilidad de las diatomeas como indicadores de contaminación e impacto ambiental es ampliamente reconocida, y con base en estas se han ingeniado índices cualitativos y cuantitativos (Medley & Clements, 1998;Ivorra et al, 1999;Gómez & Licursi, 2001;Ács et al, 2005;Salomoni et al, 2006;Penalta-Rodríguez & López-Rodríguez 2007). Estos en su mayor parte se han enfocado sobre hábitats de aguas continentales, lo que ha contribuido en la determinación de normas de calidad de agua, mismas que han sido aceptadas como referentes de la salud de ciertos ambientes.…”

Section: Introductionunclassified

Prospective observations on benthic marine diatoms taxocoenoses in a port exposed to mining residues

Martínez¹

2022

Hidrobiológica

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Vargas RESUMENAntecedentes. Existe un reciente interés por el estudio de diatomeas bentónicas marinas (DBM) y su respuesta a contaminación por elementos potencialmente tóxicos (EPT), principalmente metales que pueden impactar la composición de especies, alterar los parámetros de las asociaciones, y ocasionar deformaciones de las frústulas de diatomeas. Objetivo. Explorar qué cambios en las asociaciones de DBM podrían representar una respuesta a contaminación por EPT en ambientes marinos, usando de referencia la estructura típica de sus asociaciones, incluyendo florística, riqueza, diversidad y dominancia, así como frecuencia de frústulas deformes. Métodos. Se tomaron muestras de roca y sedimento en mayo 2015 y enero 2016 en Santa Rosalía, BCS, una playa contaminada con desechos mineros. Resultados. Se apoyó parcialmente la hipótesis propuesta, i.e., se registró entre 1 y 7.6% de valvas deformes por sitio; esta frecuencia de frústulas deformes sugiere impacto de contaminación por EPT en el área. Se registraron valores de diversidad de H´ entre 1.1 a 4.3, los cuales están dentro de los intervalos típicos de diversidad para sitios no contaminados, a pesar de que concentraciones de EPT como Cu 3760 mg kg -1 , Zn 2294 mg kg -1 , Ni 401 mg kg -1 , Pb 216 mg kg -1 , registradas en el área sobrepasan los valores de efecto de rango medio, indicando que un 50% de la biota presente sería afectada. Conclusiones. Las elevadas abundancias de ciertos taxa sugieren su capacidad de tolerar PTE, mientras que aquellos que mostraron deformaciones de sus frústulas podrían considerarse taxa sensibles.

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Section: Introductionunclassified

Prospective observations on benthic marine diatoms taxocoenoses in a port exposed to mining residues

Martínez¹

2022

Hidrobiológica

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Application of diatom biotic indices in the Guadalquivir River Basin, a Mediterranean basin. Which one is the most appropriated?

Martı́n

Toja

Sala

et al. 2010

Environ Monit Assess

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The diatom community was studied in 110 sites within the Guadalquivir River catchment area, South Spain, in order to test the applicability of diatom biotic indices developed in other European regions to this site and to provide a useful tool for monitoring water quality in the river basin. We identified 399 taxa and calculated five diatomic indices (Specific Polluosensitivity Index (IPS), Biological Diatom Index, Trophic Diatom Index, Index of the European Economic Community, and Diatom-based Eutrophication Pollution Index (EPI-D)). Since the indices analyzed were highly correlated, their results could be compared. The indices that gave the best results were the EPI-D followed by the IPS, the latter being the most widely used index in Iberian catchments. Nevertheless, the EPI-D presented certain advantages: (1) this index correlated the best with the water chemistry in the catchment area; (2) EPI-D is not sensitive to the presence of taxa belonging to the Achnanthidium minutissimum complex frequently present in the Guadalquivir basin. Nevertheless, EPI-D retains its effectiveness and thus constitutes an easier index for application from a taxonomical standpoint. We estimated the general water quality of the entire basin on the basis of EPI-D. According to these results, 55% of the sites had either high or good water quality. The species that better characterized each water quality category in the study area were: A. minutissimum (high and good), Amphora pediculus (moderate), Nitzschia frustulum (poor), and Nitzschia capitellata (bad).

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A multimetric diatom index to assess the ecological status of coastal Galician rivers (NW Spain)

2010

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There are many rivers in northwest Spain as a consequence of the mountainous landscape and the granitic geology subjected to Atlantic influences. Water and epilithic diatoms samples were collected at 72 sites in Galicia flowing into the Atlantic Ocean and Cantabrian Sea in summer 2002-2003 and spring 2004. These sites included minimally disturbed sites, defined as reference sites, and impacted sites which were influenced by different human pressures. We used the diatom assemblages to calculate diatom indices using the Omnidia software, but we also developed new metrics based on the similarity of species composition in reference sites. The response of the metrics was tested in relation to physicochemical variables. We developed a diatom multimetric index (MDIAT) as a combination of metric values. The sensitivity of the MDIAT to organic and nutrient stressors supports the use of this index to classify the ecological status of Galician rivers. The MDIAT showed higher correlations with some variables and nutrients than the individual metrics. According to the MDIAT, 69% of the sites sampled in Galician coastal rivers achieve good ecological status. The MDIAT has been developed specifically for Galician granitic rivers (NW Spain), and has been intercalibrated at the European level in the Central Baltic Rivers GIG. Our study validates the application of this multimetric index to evaluate the water quality in coastal Galician rivers.

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Diatomeas y calidad del agua de los ríos del Macizo Central Gallego (Ourense, N.O. Espana) mediante la aplicación de índices diatomológicos

Cited by 4 publications

References 0 publications

Prospective observations on benthic marine diatoms taxocoenoses in a port exposed to mining residues

Prospective observations on benthic marine diatoms taxocoenoses in a port exposed to mining residues

Application of diatom biotic indices in the Guadalquivir River Basin, a Mediterranean basin. Which one is the most appropriated?

A multimetric diatom index to assess the ecological status of coastal Galician rivers (NW Spain)

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