Overview of the geography of the Monte Desert biome (Argentina)

Abraham, Elena María; Valle, Héctor F. del; Roig, Fidel Antonio; Torres, L.; Ares, J.; Coronato, Fernando Raúl; Godagnone, R.

doi:10.1016/j.jaridenv.2008.09.028

Cited by 162 publications

(135 citation statements)

References 17 publications

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“…Su hábitat está caracterizado por precipitaciones de ocurrencia estival (entre noviembre y marzo) que varían entre 100 y 350 mm, de carácter torrencial y con una marcada variabilidad temporal y espacial (Abraham et al 2009). La relación entre las precipitaciones y la evapotranspiración potencial oscila entre 0,05 y 0,5.…”

Section: Métodosunclassified

Tratamientos pregerminativos para la ruptura de la dormición en semillas de tres poblaciones de Ramorinoa girolae, leñosa endémica de zonas áridas en Argentina

Zapata¹,

Malo

Karlin³

2017

Bosque (Valdivia)

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Section: Métodosunclassified

Tratamientos pregerminativos para la ruptura de la dormición en semillas de tres poblaciones de Ramorinoa girolae, leñosa endémica de zonas áridas en Argentina

Zapata¹,

Malo

Karlin³

2017

Bosque (Valdivia)

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“…Río Negro Province lies within Patagonia (encompassed in the Monte Desert), extending westward from the Atlantic Ocean to the Cordillera of the Andes to the north of 42°S and the border with Neuquén Province (Abraham et al 2009) (Fig. 2).…”

Section: Río Negromentioning

confidence: 99%

“…The control province of Río Negro is characterised by sandy plains of Quaternary fluvial, lacustrine and aeolian origin (Abraham et al 2009). Mean iAs species concentrations for the surface waters (n = 8) were 4.3 μg l (Table 4).…”

Section: Río Negromentioning

confidence: 99%

Arsenic contamination of natural waters in San Juan and La Pampa, Argentina

O'Reilly

Watts

Shaw

et al. 2010

Environ Geochem Health

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Arsenic (As) speciation in surface and groundwater from two provinces in Argentina (San Juan and La Pampa) was investigated using solid phase extraction (SPE) cartridge methodology with comparison to total arsenic concentrations. A third province, Río Negro, was used as a control to the study. Strong cation exchange (SCX) and strong anion exchange (SAX) cartridges were utilised in series for the separation and preservation of arsenite (As ). Samples were collected from a range of water outlets (rivers/streams, wells, untreated domestic taps, well water treatment works) to assess the relationship between total arsenic and arsenic species, water type and water parameters (pH, conductivity and total dissolved solids, TDS). Analysis of the waters for arsenic (total and species) was performed by inductively coupled plasma mass spectrometry (ICP-MS) in collision cell mode. Total arsenic concentrations in the surface and groundwater from Encon and the San José de Jáchal region of San Juan (north-west Argentina within the Cuyo region) ranged from 9 -357 μg l -1As. Groundwater from Eduardo Castex (EC) and Ingeniero Luiggi (LU) in La Pampa (central Argentina within the Chaco-Pampean Plain) ranged from 3 -1326 μg l -1As. The pH range for the provinces of San Juan (7.2 -9.7) and La Pampa (7.0 -9.9) are in agreement with other published literature. The highest total arsenic concentrations were found in La Pampa well waters (both rural farms and pre-treated urban sources), particularly where there was high pH (typically > 8.2), conductivity (> 2600 μS cm As. Arsenic species for both provinces were predominantly As for groundwater, respectively. This translates to a relative As III abundance of 69 -100 % of the total arsenic in surface waters and 32 -100 % in groundwater. This is unexpected because it is typically thought that in oxidising conditions (surface waters), the dominant arsenic species is As V . However, data from the SPE methodology suggests that As III is the prevalent species in San Juan, indicating a greater influence from reductive processes. La Pampa groundwater had As (equating to up to 33 % of the total arsenic). Previously published literature has focused primarily on the inorganic arsenic species, however this study highlights the potentially significant concentrations of organoarsenicals present in natural waters. The potential for separating and preserving individual arsenic species in the field to avoid transformation during transport to the laboratory, enabling an accurate assessment of in-situ arsenic speciation in water supplies is discussed.

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“…1). Climate is arid to semi-arid, characterized by a mean annual precipitation of 155 mm, and by large seasonal and daily temperature variability (Morello, 1958;Abraham et al, 2009) (Fig. 1).…”

Section: Sites Descriptionmentioning

confidence: 99%

Assessing the Sensitivity of Riparian Algarrobo Dulce (<i>Prosopis flexuosa</i> DC) Radial Growth to Hydrological Changes

Piraino

Roig

2016

Geochronometria

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Ecotones, as for example riparian zones, have long interested ecologists, due to their potential role in generating species biodiversity and evolutionary novelty, as well as their sensitivity to environmental changes. Along riparian areas, vegetation is recognized for its ecological importance in several ecosystemic processes. In the Central Monte Desert (central-west Argentina), Prosopis flexuosa grows in territories characterized by a permanent access to water reservoirs, e.g. along riverbanks, where the species forms the classic gallery forests. Despite the ecosystemic role of the different Prosopis species distributed in arid lands, thus far no analysis has been conducted regarding the relation between their radial growth and hydrological changes, namely streamflow variability, in riparian settings. To fill this gap of knowledge, we performed a dendrochronological analysis considering several riparian P. flexuosa trees differing in their spatial position in relation to the riverbank. Pointer years, correlation function, and regression analyses show differences in the dendrohydrological signal of the studied species, probably function of tree distance from the river. In this sense, radial growth of trees distributed near the riverbank is tightly coupled to spring-summer (September to March) streamflow variability, whereas for farthest trees the ring development is driven by a combination of winter and spring river discharge and late-summer precipitation amount. The presented results demonstrate the potentiality of P. flexuosa, and in a broader sense of the Prosopis genus, in dendrohydrological studies.

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Overview of the geography of the Monte Desert biome (Argentina)

Cited by 162 publications

References 17 publications

Tratamientos pregerminativos para la ruptura de la dormición en semillas de tres poblaciones de Ramorinoa girolae, leñosa endémica de zonas áridas en Argentina

Tratamientos pregerminativos para la ruptura de la dormición en semillas de tres poblaciones de Ramorinoa girolae, leñosa endémica de zonas áridas en Argentina

Arsenic contamination of natural waters in San Juan and La Pampa, Argentina

Assessing the Sensitivity of Riparian Algarrobo Dulce (<i>Prosopis flexuosa</i> DC) Radial Growth to Hydrological Changes

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