Claudia Feijoó

National University of Luján

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Adonis Giorgi

National University of Luján

Nicolás Ferreiro

National University of Luján

María Laura Messetta

National University of Luján

Cecilia Hegoburu

National University of Luján

Leonardo Leggieri

Consejo Nacional de Investigaciones Científicas y Técnicas

Rafael Marcé

Centre d'Estudis Avançats de Blanes

Nora Gómez

Consejo Nacional de Investigaciones Científicas y Técnicas

Laura Rigacci

National University of Luján

Ana Torremorell

Universidad Nacional de La Plata

Alberto Rodrigues Capítulo

Instituto Nacional de Limnología

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

National University of Luján

Universitat de Barcelona

Centro Científico Tecnológico - San Juan

Laboratoire Microorganismes Génome et Environnement

University of Girona

National University of Comahue

Clermont Université

Université Clermont Auvergne

Universidad Nacional de La Plata

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Acidification and increase of phosphorus levels in Pampean streams after 12 years of agricultural intensification

Research Square (Research Square) (2023)

Claudia Feijoó Cecilia Hegoburu María Laura Messetta José Guerra-López Laura Rigacci

Abstract Agricultural intensification is a process that is still undergoing in many emergent economies. In the Pampas (central Argentina), the former low-external input farming was replaced by a model based on genetically modified crops and the intensive use of pesticides (mainly glyphosate) in the last decades. Here, we analyzed changes in water chemistry (pH, conductivity, dissolved oxygen, nutrients, and carbonates) in 41 streams of Buenos Aires province between 2003/04 and 2015/16, and the impact of geology, soil type and land use change on water chemistry. We also used the SPARROW model to further analyze possible drivers of stream phosphorus loads. We observed modifications at reach scale in several streams, including changes in channel morphology, riparian vegetation and land use, and a moderate expansion of agriculture in most basins. Mean nitrate concentration did not significantly change between 2003/04 and 2015/16, and it was related to cropland cover in the basins. Dissolved phosphorus concentration increased in the streams, especially in the southern fluvial regions, but contrary to our expectations, phosphorus levels were not associated to land use but to pH. The SPARROW model also supported the link between water acidification and phosphorus concentration, and indicated that the whole basin acts as a phosphorus source. Possible explanations of fluvial acidification may be related to current agricultural practices, including higher inputs of labile carbon from croplands, soil acidification by nitrogenous fertilizers, and the generalized use of glyphosate. This highlights the necessity of adopting new agricultural paradigms to reduce the use of agrochemicals in Pampean basins.

Agricultural land

Land Cover

10.21203/rs.3.rs-2807594/v1

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Citations (1)

Patterns and controls of carbon dioxide concentration and fluxes at the air–water interface in South American lowland streams

Aquatic Sciences (2022)

Claudia Feijoó Maite Arroita María Laura Messetta Julieta Anselmo Laura Rigacci

Alkalinity

Total inorganic carbon

10.1007/s00027-022-00852-9

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Citations (4)

Nutrient fluxes through boundaries in the hypolimnion of Sau reservoir: expected patterns and unanticipated processes

Limnetica (2006)

Rafael Marcé Enrique Moreno‐Ostos Claudia Feijoó Enrique Navarro Luciano Caputo

By contrast to many natural lakes, the summer hypolimnion in advection-dominated systems like canyon-shaped reservoirs is not isolated from direct inputs from the river.This has important implications in the evolution of limnological features of the hypolimnion through the stratified period, especially if the river water directly plunges as a density current into the hypolimnion as a consequence of temperature differences.Taking the Sau Reservoir (Spain) as a prototype for this kind of systems, we present data from 11 years of monitoring to show how the river water entering the reservoir during summer is the main factor determining hypolimnetic nutrient concentrations.The empirical regression approach used all through the paper also stressed the effect of the improvement in water quality experienced by the river during the studied period on the improvement of the water quality stored in the summer hypolimnion of the reservoir.Since the change in river water quality was the consequence of the implementation of remediation measures at the basin scale, we advocate these solutions to manage reservoir eutrophication problems in this type of systems, which, in addition, had other unexpected benefits for the hypolimnetic water quality in Sau Reservoir.

10.23818/limn.25.36

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Citations (17)

Dissolved phosphorus uptake in subtropical and temperate streams of Argentina

Limnetica (2018)

María de Lourdes Gultemirian Adonis Giorgi Claudia Feijoó María Carolina Rodríguez Castro Hugo R. Fernández

An abrupt CO 2 -mediated decrease in pH affects growth rates, cellular features and the interspecific interaction of Scenedesmus (Acutodesmus) obliquus and Cryptomonas pyrenoidiferaThe technologies of anthropogenic CO 2 mitigation, such as carbon capture and sequestration, may pose an environmental threat to aquatic systems.In a scenario of CO 2 leakage from a carbon capture and sequestration process, very low-pH values might be reached and could remain over time.The main objective of this study was to detect how an abrupt lowering of pH would affect the microalgae Scenedesmus (Acutodesmus) obliquus and Cryptomonas pyrenoidifera at physiological, morphological and population levels, and also see how these effects could lead to ecological consequences.Monospecific and mixed culture experiments were run according to this purpose over 14 days and at a pH of 6.5, controlled by CO 2 injection.An increased CO 2 concentration significantly enhanced the growth rate of both species and especially affected the cell size of C. pyrenoidifera in the monoculture.The total biovolume of C. pyrenoidifera was higher than the total biovolume of S. obliquus in the control treatment, although neither of the two species were dominant in the culture experiments.Granularity responded in different ways for the species studied, being statistically different within subjects in monospecific and mixed culture experiments.Only chlorophyll and granularity have been significantly correlated in the low pH of C. pyrenoidifera monoculture.Due to its ecological relevance, the decreased colony formation ability of S. obliquus under a high CO 2 concentration is highlighted.

10.23818/limn.37.23

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Seasonal weather effects on hydrology drive the metabolism of non-forest lowland streams

Hydrobiologia (2013)

Leonardo Leggieri Claudia Feijoó Adonis Giorgi Nicolás Ferreiro Vicenç Acuña

Ecosystem respiration

Seston

River ecosystem

Periphyton

10.1007/s10750-013-1543-4

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Citations (15)

Catchment morphometric characteristics, land use and water chemistry in Pampean streams: a regional approach

Hydrobiologia (2015)

Graciana Amuchástegui Leonardo Di Franco Claudia Feijoó

Land Cover

Riparian buffer

Agricultural land

10.1007/s10750-015-2478-8

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Citations (38)

Influence of a macrophyte bed on sediment deposition in a small plain stream

SIL Proceedings 1922-2010 (1994)

Claudia Feijoó Gustavo Ferreyra Nuncia M. Tur Fernando Momo

Deposition

Coastal plain

10.1080/03680770.1992.11900516

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Citations (4)

High nutrient retention in chronically nutrient-rich lowland streams

Freshwater Science (2016)

Victoria García Patricia Gantes Loreta Giménez Cecilia Hegoburu Nicolás Ferreiro

Nutrient retention has been studied intensively in streams, but some mechanisms and processes are not yet entirely understood, especially in open-canopy streams. We evaluated PO43−, as soluble reactive P (SRP), and NH4+ uptake in 2 chronically enriched Pampean streams with different macrophytic abundance. We performed short-term nutrient additions to quantify SRP and NH4+ uptake metrics throughout the year, and we investigated which hydrological and biological factors influenced nutrient uptake. The results showed that SRP and NH4+ uptakes were high in relation to pristine and impaired streams elsewhere, and they did not saturate despite elevated background nutrient levels. NH4+ areal uptake rate fit in a 1st-order uptake model, but an exponential model described the relationship between SRP areal uptake rate and SRP concentration. Consistent with this finding, SRP uptake velocity tended to increase linearly, and SRP uptake length decreased linearly with SRP concentration. The analysis of factors influencing uptake metrics suggested that SRP uptake mainly depended on heterotrophic demand, whereas NH4+ uptake was enhanced under more autotrophic conditions. Our results showed that nutrient uptake metrics of enriched Pampean streams were similar to those observed in streams with low nutrient levels.

Autotroph

10.1086/690598

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Citations (26)

Erratum: Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes

Environmental Research Letters (2013)

Joan Artigas Emili García‐Berthou Delia Elena Bauer M. I. Castro Joaquín Cochero

Biome

10.1088/1748-9326/8/1/019601

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Citations (5)

Global changes in pampean lowland streams (Argentina): implications for biodiversity and functioning

Springer eBooks (2010)

Alberto Rodrigues Capítulo Nora Gómez Adonis Giorgi Claudia Feijoó

10.1007/978-94-007-0608-8_5

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Citations (13)