Horticulture affects macroinvertebrate assemblages in adjacent streams (Buenos Aires, Argentina)

The agrochemicals used on crops can reach watercourses, affecting water quality and biologic communities. The aim of this research was to study the effects of horticulture on the water quality and invertebrate assemblages of adjacent streams in Buenos Aires province, Argentina. Four streams draining horticultural basins were compared with another four considered less disturbed: two of the latter located in a Biosphere Reserve and the other two in extensive livestock-raising basins. Pesticides were detected in the horticulture-related streams, while nutrient concentrations were significantly higher than in the less-disturbed streams. The macroinvertebrate assemblages differed: the less-disturbed streams exhibited a significantly higher taxa richness and density. Hyalella sp. and Simocephalus vetulus were dominant, whereas Entomobryoidea, Dugessidae, and Glossiphoniidae were dominant in the horticulture-associated streams. Ephemeroptera (Caenis and Baetidae) were well represented in the less-disturbed streams and rare or absent in the horticulture-adjacent streams. Multivariate analysis indicated that the horticulture-impacted sites contained high nutrient concentrations and tolerant taxa, while the less-disturbed sites corresponded to lower nutrient concentrations and sensitive taxa. We propose Hyalella sp. and S. vetulus as water-quality indicators in pampean streams and conclude that intensive agrochemical applications in horticulture increase nutrient and pesticide loads affecting the macroinvertebrate assemblages of adjacent streams.

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Nutrient Input and Trophic Status of the “Neue Donau”, a High-Water Control System along the River Danube in Vienna, Austria

Water Science & Technology ◽

10.2166/wst.1990.0021 ◽

1990 ◽

Vol 22 (5) ◽

pp. 137-144 ◽

Cited By ~ 3

Author(s):

M. T. Dokulil ◽

G. A. Janauer

Keyword(s):

Water Quality ◽

Control System ◽

Trophic Status ◽

High Water ◽

Nutrient Concentrations ◽

Nutrient Input ◽

Water Control ◽

Trophic Conditions ◽

River Danube ◽

High Nutrient

The system “Neue Donau” functions as a control system for high waters of the river Danube and is an important recreational area for many people. Water quality and trophic status of the water body is thereforeof prime importance. The high nutrient concentrations of the river Danube (P-tot 238±41µg/l, N-tot 2.53±0.78 mg/l) reach the system via groundwater seepage. Present conditions in the basin of Neue Donau are,as a result of this nutrient in-flux,eutrophic to hypertrophic. Average values during the summer period have declined from 366 µg/l total phosphorus to 78 µg/l, and from 86 µg/l chlorophyll-a tol7µg/l between the years 1985 and 1988. However, a dam which is planned in the river at Vienna will permanently raise the water level of the river thus increasing the the groundwater flow in the direction to the Neue Donau and therefore the nutrient input which will enhance trophic conditions in the impoundment. Since macrophytes play an important role in one part of the system macrophyte management together with measures along the river are some of the suggested strategies to keep the system Neue Donau at acceptable trophic conditions and good water quality.

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Water quality in equine production in Buenos Aires Province, Argentina

SN Applied Sciences ◽

10.1007/s42452-020-2263-9 ◽

2020 ◽

Vol 2 (3) ◽

Author(s):

Mariana M. Vaccaro ◽

Alejandra V. Volpedo ◽

Alberto García Liñeiro ◽

Alicia Fernñandez Cirelli

Keyword(s):

Water Quality ◽

Buenos Aires ◽

Buenos Aires Province

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Evaluation of bottled water quality by determining nitrate concentration

Journal of Water and Health ◽

10.2166/wh.2020.125 ◽

2020 ◽

Vol 18 (5) ◽

pp. 681-691

Author(s):

María Susana Fortunato ◽

Ana Julieta González ◽

María Florencia Tellechea ◽

Mariano Humberto Reynoso ◽

Favia Vallejos ◽

...

Keyword(s):

Water Quality ◽

Buenos Aires ◽

Nitrate Concentration ◽

Public Awareness ◽

Bottled Water ◽

Buenos Aires Province ◽

Water Access ◽

Limit Value ◽

Random Samples ◽

Consumption Habits

Abstract The presence of nitrate in sources of drinking water is a matter of concern because of its potential risk for human health. In many countries like Argentina, an increasing proportion of the population chooses to consume bottled water, among other reasons, for lack of water access. The present study was conducted (a) to evaluate the quality of bottled waters by determining nitrate concentration, (b) to relate bottled water quality with water access, (c) to analyze public awareness about bottled water quality and consumption habits of the population in the urban area of Buenos Aires. Two locations were selected, Ciudad Autónoma de Buenos Aires (C.A.B.A.) and Malvinas Argentinas in Buenos Aires Province (PBA), with percentages of water access of 99.6% and 8.8%, respectively. Random samples from both locations (n = 100) were analyzed. A survey was conducted in order to inquire about perception of population on bottled water quality and their consumption habits. In C.A.B.A., no sample exceeded the 45 mg/L limit value in force in Argentina, while in Malvinas Argentinas, 34% of the brands analyzed showed values above it. The survey revealed that 71.7% of people consume bottled water. While people in C.A.B.A. do so mainly out of habit, safety is the priority in PBA.

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Water quality assessment of the Burgos stream micro-basin (San Pedro, Buenos Aires Province) impacted by rural activities

Revista del Museo Argentino de Ciencias Naturales ◽

10.22179/revmacn.20.588 ◽

2018 ◽

Vol 20 ◽

pp. 239-250

Author(s):

Anahí Magdaleno ◽

Marta Paz ◽

Julián Mantovano ◽

Laura de Cabo ◽

Sabrina Bollani ◽

...

Keyword(s):

Water Quality ◽

Quality Assessment ◽

Buenos Aires ◽

Water Quality Assessment ◽

Buenos Aires Province ◽

San Pedro

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Specific indicator invertebrates of urbanized habitats in tributary streams of the Luján River basin (Buenos Aires, Argentina)

Annales de Limnologie - International Journal of Limnology ◽

10.1051/limn/2021010 ◽

2021 ◽

Vol 57 ◽

pp. 12

Author(s):

Agustina Belén Fañani ◽

Luciana Cibils-Martina ◽

María Andrea Casset ◽

Barbara Pamela Banegas ◽

Teresita Inés Poretti ◽

...

Keyword(s):

Water Quality ◽

River Basin ◽

Buenos Aires ◽

Sampling Site ◽

Principal Component ◽

Buenos Aires Province ◽

Urbanization Gradient ◽

Indicator Taxa ◽

Four Seasons ◽

Suspended Particulate

The increase of urbanized areas produces disturbances in rivers and streams, and its widespread effects reduce water quality and threaten aquatic biota. The aim of this study was to analyze changes in the invertebrate communities of the Luján River basin (Buenos Aires Province, Argentina) in an urbanization gradient and to determine the specific indicator taxa of urbanized habitats. Nine sampling sites were selected in the Luján River basin, distributed along a land use gradient. At each sampling site physicochemical variables of water were recorded, and invertebrate samples were collected during four seasons. A Principal Component Analysis separated three groups of sites with different urbanization conditions: low (<15%), moderate (between 15% and 60%) and high urbanization (>60%). These groups showed differences in the concentration of dissolved oxygen, suspended particulate organic matter, and nitrates. The communities changed with urbanization conditions, with a simplification of the community composition and a decrease in richness towards the lower basin (moderate and high urbanization). The IndVal method found three indicator taxa for the low urbanization sites (Heleobia sp. (Cochliopidae), Uncancylus sp. (Ancylidae) and Callibaetis sp. (Baetidae)) and three for the moderate urbanization habitats (Nematoda, Hyalella curvispina (Hyalellidae) and Chironominae). These taxa were useful to identify different disturbance conditions due to urbanization, which makes them potential bioindicators in the diagnosis and monitoring of water quality in the Luján River basin.

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Index of Biotic Integrity based on fish assemblages for pampean streams and its implementation along the Del Azul stream (Buenos Aires province, Argentina)

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x8220 ◽

2021 ◽

Vol 33 ◽

Author(s):

Ignacio Masson ◽

José Gonzalez Castelain ◽

Sabrina Dubny ◽

Natalia Othax ◽

Fabio Peluso

Keyword(s):

Water Quality ◽

Fish Assemblages ◽

Water Quality Monitoring ◽

Index Of Biotic Integrity ◽

Alternative Methods ◽

Biotic Integrity ◽

Buenos Aires Province ◽

Local Index ◽

Pampean Streams ◽

Environmental Integrity

Abstract: Aim Freshwater communities respond to abiotic and biotic changes in the environment, and are widely used as indicators of environmental integrity. Fish have been one of the most used biological groups for this purpose. The Del Azul stream located in the pampean region of Argentina has been monitored using a physicochemical approach with this monitoring being sporadic due to economic and operational constraints associated with the chemical analyses. In this paper we developed an Index of Biotic Integrity for the Del Azul stream (IBIA) based on Karr´s Index of Biotic Integrity as an alternative. Methods We computed two existent physicochemical indexes for comparison, one of them is the NSF-WQI and the other one is a local index referred to as Water Quality Index for Del Azul Stream and based on the former. Results The three indexes followed similar trends along the examined reaches, showing good conditions in the upper basin, poor conditions just downstream of the urban area and a recovery state further downstream in the basin. Conclusions Since the IBIA followed the same patterns as the physicochemical indexes, has a lower implementation cost and it is simpler to apply, we promote it as an alternative to the traditional physicochemical water quality monitoring for pampean streams.

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Stored Nutrients and Climate Warming Will Feed More Algal Blooms

Eos ◽

10.1029/2020eo138117 ◽

2020 ◽

Vol 101 ◽

Author(s):

Elizabeth Thompson

Keyword(s):

Water Quality ◽

Climate Warming ◽

Algal Blooms ◽

Nutrient Concentrations ◽

Future Scenarios ◽

New Model ◽

High Nutrient

High nutrient concentrations cause water quality problems in lakes, and as the climate warms, these issues will only get worse. A new model assesses future scenarios and explores solutions.

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Conservation unit and water quality: the influence of environmental integrity on benthic macroinvertebrate assemblages

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x2013000400009 ◽

2013 ◽

Vol 25 (4) ◽

pp. 442-450

Author(s):

Jessé Renan Scapini Sobczak ◽

Alice Teresa Valduga ◽

Rozane Maria Restello ◽

Rafael Imlau Cardoso

Keyword(s):

Water Quality ◽

Benthic Macroinvertebrates ◽

Habitat Diversity ◽

Benthic Macroinvertebrate ◽

Conservation Unit ◽

Macroinvertebrate Assemblages ◽

Taxa Richness ◽

Assessment Protocol ◽

Shannon Diversity ◽

Environmental Integrity

AIM: This study aimed to determine the effectiveness of a Conservation Unit (CU) in maintaining the quality of freshwater habitats and to evaluate the influence of environmental integrity on benthic macroinvertebrate assemblages. METHODS: The research was conducted at sampling sites located within and outside of the CU in the Alto Uruguai region, southern Brazil, and included two stages: (i) the collection of benthic macroinvertebrates and (ii) the application of a Rapid Assessment Protocol (RAP) to characterise the habitat quality. RESULTS: A total of 1,362 benthic macroinvertebrates were collected during the study, totalling 30 taxa. The densities within and outside the CU were significantly different (F= 160.08; p= 0.05), and the Shannon diversity and taxa richness followed the same pattern (F= 118.72, p= 0.05; and F= 176.33, p= 0.04, respectively). In contrast, the Pielou equitability did not differ within and outside the CU (F= 0.19, p= 0.74). The biotic index (Biological Monitoring Working Party) indicated that water quality was good or very good in the majority of cases. Most of the sampling sites were classified as ‘natural’ according to the RAP. The taxa richness was significantly related to habitat diversity (F= 7.24; p = 0.05), but no significant relationship was found between the habitat diversity and the Shannon diversity (F= 2.13, p = 0.22). CONCLUSION: The CU was effective for the conservation of water quality and the freshwater biodiversity of benthic macroinvertebrates. The results show that the environmental integrity was related to the distribution of benthic macroinvertebrates, primarily to the taxa richness. More detailed investigations need to be developed to better understand these relationships and to take into account the temporal scale. An analysis of the most significant sources of stress on the aquatic life outside the area is recommended.

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