Nuevos registros de Bacillariophyceae en ecosistemas lóticos del Noroeste de Argentina II

Taboada, María de Los Ángeles; Marco, Silvia N. Martínez De; Bustos, Martínez; Tracanna, Beatriz Concepción

doi:10.30550/j.lil/2018.55.1/7

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…Analyzing the PC2 axis, it is observed that the variable with the highest positive weight corresponds to pH, while the one with the highest negative weight is COD; it is observed that the SU dominated by chlorophytes are located towards the positive region of The phytoplankton of the Itiyuro reservoir presented a considerable number of species, highlighting the richness of green algae over other phytoplankton groups, while in the Caraparí river, Bacillariophyta were the dominant ones. Previous studies carried out in rivers of northwestern Argentina, report a clear predominance of the Bacillariophyceae class, not only in relation to their abundances but also to richness (Seeligmann et al 2001;Mirande and Traccana 2005;Martínez Demarco et al 2011;Galea et al 2014;Taboada et al 2018). On the other hand, larger reservoirs in northwestern Argentina (Cabra Corral and El Tunal) that have been studied in the past were characterized by the dominance of Chlorophyta (Salusso and Moraña 2014), in agreement with that observed in Itiyuro.…”

Section: Dependent Canonical Variable or Criterion Or Endogenous Vari...mentioning

confidence: 92%

Primera caracterización de un reservorio tropical somero en riesgo en el norte de la Argentina

2022

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The study of shallow tropical environments in northwestern Argentina is poorly developed. The Itiyuro reservoir is of major importance for supplying drinking water to more than 100000 people in the San Martin department. The development of cyanobacterial blooms with cyanotoxin-producing species in the reservoir constitutes a health problem. The present study explores the relationship between phytoplankton communities and limnological variables in the Caraparí river and the Itiyuro reservoir, between June 2018 and January 2020, using standardized techniques. Bacillariophyta were dominant in the river, and cyanobacteria and chlorophytes, in the reservoir. A multispecific bloom of cyanobacteria was observed in the summer of the last year sampled. Only 22% of the species in the reservoir were dominant, including Aphanizomenon gracile, Raphidiopsis spp., Pseudanabaena limnetica and Monoraphidium contortum; this implies a low average dominance (0.29) in 65% of the samples. In both systems, 50% of the species were rare, and the abundance of the constant species was low. Phytoplankton abundance -and, in particular, of cyanobacteria-was higher in the highwater phase, characterized by a high average temperature (22.7 °C) and higher nutrient inputs from runoff. To date, there is no continuous monitoring of the reservoir by the drinking water service providers. Performing periodic samplings would allow the detection of algal and cyanobacterial blooms and the release of toxins in time, as well as developing management protocols.

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Section: Dependent Canonical Variable or Criterion Or Endogenous Vari...mentioning

confidence: 92%

Primera caracterización de un reservorio tropical somero en riesgo en el norte de la Argentina

2022

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“…In Argentina, most of the developed indices have been based on rivers of Pampean plain, using epipelic diatoms (Gómez, 1998(Gómez, , 1999Gómez & Licursi, 2001;Licursi & Gómez, 2002, 2003. Besides, in Argentina, there are few studies focused on phytobenthos, and most are focused on humid mountain environments (Taboada et al, 2018) and plains (Giorgi & Ferreyra, 2000;Gómez & Licursi, 2001). The rivers of semi-arid regions of northwestern Argentina are especially vulnerable to the effect of pollutants (i.e: agrochemicals and nutrients from the agricultural industry; household residues/waste, etc.…”

Section: Introductionmentioning

confidence: 99%

Are quality biological indices universally useful? Limits of benthic based indices in a brackish and arid sub‐basin from Argentina

et al. 2023

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The water quality of rivers belonging to an arid sub‐basin in northern Argentina was evaluated in a longitudinal gradient, during the period of maximum dryness in 2017. The composition and structure of the phytobenthos were studied using biotic indices. A total of 126 spp. were determined, with a predominance of diatoms and Cyanobacteria. Most of the diatom species found were meso to polyhalobus and tolerant to organic contamination. Despite the rivers of the basin cross areas with very different land uses, no differences were recorded in phytobenthos abundances between sites. The Pantle & Buck Saprobity index classified the sub‐basin in the α‐mesosaprobability range, and the diatomaceous eutrophication/pollution index assigns poor quality to most of the sites. Salinity should induce phycoflora homogenization that limits the sensibility of biotic indices to anthropogenic impacts.

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“…En Argentina, la mayoría de los índices desarrollados se han basado en ríos de la llanura pampeana, utilizando diatomeas epipélicas (Gómez, 1998(Gómez, , 1999Gómez & Licursi, 2001;Licursi & Gómez, 2002, 2003. Por otra parte, en Argentina son escasos los estudios centrados en el fitobentos, y la mayoría están enfocados en ambientes húmedos de montaña (Taboada et al, 2018) y llanura (Giorgi & Ferreyra, 2000;Gómez & Licursi, 2001). Los ríos de las regiones semiáridas del noroeste argentino son especialmente vulnerables al efecto de los contaminantes (i.e: agroquímicos y nutrientes de la industria agropecuaria; residuos/desechos domiciliarios, etc.).…”

Section: Introductionunclassified

¿Los índices biológicos de calidad son universalmente útiles? Límites de los índices basados en bentos en una subcuenca salobre y árida de Argentina

et al. 2023

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ResumenSe evaluó la calidad del agua de los ríos de una subcuenca árida del norte de Argentina en un gradiente longitudinal, durante el período de sequía máxima de 2017. Se estudió la composición y estructura del fitobentos mediante índices bióticos. Se determinaron 126 spp. en total, con predominio de diatomeas y cianobacterias. La mayoría de las especies de diatomeas encontradas eran de meso a polihalobas y tolerantes a la contaminación orgánica. A pesar de que los ríos de la cuenca atraviesan zonas con usos de la tierra muy diferentes, no se registraron diferencias en las abundancias de fitobentos entre los sitios. Según el Índice de Saprobiedad de Pantle & Buck, la subcuenca se clasificó en el rango de α‐mesosaprobiedad, y el Índice de Eutrofización/Contaminación por Diatomeas asigna una calidad baja a la mayoría de los sitios. La salinidad debe inducir una homogeneización de la ficoflora que limita la sensibilidad de los índices bióticos a los impactos antropogénicos.

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Nuevos registros de Bacillariophyceae en ecosistemas lóticos del Noroeste de Argentina II

Cited by 4 publications

References 18 publications

Primera caracterización de un reservorio tropical somero en riesgo en el norte de la Argentina

Primera caracterización de un reservorio tropical somero en riesgo en el norte de la Argentina

Are quality biological indices universally useful? Limits of benthic based indices in a brackish and arid sub‐basin from Argentina

¿Los índices biológicos de calidad son universalmente útiles? Límites de los índices basados en bentos en una subcuenca salobre y árida de Argentina

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