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4. Quaternary climatic events as conditioning factors of hydrogeologic characteristics and salinity in costal aquifers at northern Patagonia, Argentina.

Author

Carol, Eleonora, Perdomo, Santiago, Tanjal, Carolina, Scivetti, Nicolás, and Alvarez, María del Pilar

Subjects
BEACH ridges, CALCRETES, AQUIFERS, SEAWATER, GROUNDWATER, HYDROGEOLOGY, SALINITY, SALINE waters
Abstract

In arid and semiarid coastal areas, freshwater resources are scarce and are frequently affected by salinization processes. The aim of this work is to evaluate the influence of Late Quaternary climatic events on the hydrogeologic characteristics conditioning the distribution of fresh, brackish, and saline ground water in the Holocene and Pleistocene beach ridges in coastal aquifers of northern Patagonia. To achieve this, geologic, geomorphological, geophysical, hydrochemical, and isotopic studies were carried out, which allowed the identification of the hydrolithologic characteristics controlling groundwater salinity in a context of Quaternary geologic–geomorphological–climatic evolution. In Pleistocene beach ridges, it was recognized that the formation of calcretes in an arid period after Marine Isotope Stage (MIS) 5e conditioned the permeability of superficial sediments, strongly decreasing infiltration rates. During the Holocene, beach ridges were deposited and sea water entered the Pleistocene ridges. Subsequently, with the sea-level drop and wetter climatic conditions, rainwater began to infiltrate, recharging the aquifers and displacing seawater, allowing development of freshwater lenses. However, freshwater lenses only developed in Holocene ridges due to the lower permeability of Pleistocene ridges, which determines that in these geoforms, sea water cannot be displaced by rainwater, and therefore groundwater is brackish to saline. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Diallel crossing among maize populations for resistance to fall armyworm

Author

Alvarez María del Pilar and Miranda Filho José Branco de

Subjects
genetic resistance, partial diallel, germplasm, Agriculture (General), S1-972
Abstract

Among the insects infecting the maize (Zea mays L.) crop in Brazil, the fall armyworm (Spodoptera frugiperda Smith, 1797, Lepdoptera: Noctuidae) is considered one of the most important because it causes the highest damage to yield. Genetic resistance to the fall armyworm has be an effective control strategy. The main objective of this work was to evaluate new germplasm sources for resistance to the fall armyworm, the key pest for the maize crop in Brazil. A partial diallel design between 20 varieties of Brazilian germplasm and nine exotic and semi-exotic varieties of different origin was used. The 180 crosses and 29 parental varieties along with two commercial checks were evaluated in three locations in the State of São Paulo State (Brasil). Fall armyworm resistance (FAWR) under artificial and natural infestations, grain yield (GY), and plant height (PH) were analyzed. The populations CMS14C and MIRT, and hybrid São José x MIRT showed the highest resistance, with values of 1.8, 1.7 and 1.4, respectively. Populations PMI9401 and PR91B, and the hybrid CMS14C x (B97xITU) had best yields, with 4893, 3858 and 5677 kg ha-1, respectively. Heterosis ranged from -28% to 47% for FAWR and from -21% to 125% for GY, with mean values of -0,43% and 31%, respectively. Genotype by environment interaction was not significant for FAWR. The effects of varieties and heterosis were significant for all traits, showing that both additive and dominance effects may be important as sources of variation. For FAWR, only specific heterosis presented significance, suggesting strong genetic divergence between specific pairs of parental populations. Brasilian populations PMI9302 and São José, and the exotic population PR91B presented high performance per se, and also in croses for FAWR and GY. Crosses PMI9401 x (Cuba110 x EsalqPB1) and São José x MIRT presented high specific heterosis effects for both characters. These populations can be useful to be introgressed in maize breeding programs.

Published
2002

28. Mechanism of removal and retention of heavy metals from the acid mine drainage to coastal wetland in the Patagonian marsh

Author

Yanina Lorena Idaszkin, Alvarez María del Pilar, and Eleonora Silvina Carol

Subjects
Environmental Engineering, Marsh, 010504 meteorology & atmospheric sciences, Health, Toxicology and Mutagenesis, Drainage basin, 010501 environmental sciences, Wastewater, 01 natural sciences, Mining, SALT MARSH PLANTS, Ciencias de la Tierra y relacionadas con el Medio Ambiente, SOIL POLLUTION, MINING WASTE DEPOSITS, SAN ANTONIO BAY, Metals, Heavy, Environmental Chemistry, Soil Pollutants, Organic matter, Drainage, 0105 earth and related environmental sciences, chemistry.chemical_classification, geography, ARGENTINA, Minerals, geography.geographical_feature_category, MINERALOGY, Public Health, Environmental and Occupational Health, Environmental engineering, General Medicine, General Chemistry, Acid mine drainage, Pollution, Soil contamination, chemistry, Environmental chemistry, Salt marsh, Wetlands, Soil water, Environmental science, Meteorología y Ciencias Atmosféricas, Acids, CIENCIAS NATURALES Y EXACTAS, Environmental Monitoring
Abstract

The attenuation of the acid mine drainage is one of the most important environmental challenges facing the mining industry worldwide. Mining waste deposits from an ancient metallurgical extraction of heavy metals were found near to the San Antonio marsh in Patagonia. The aim of this work was to determinate which mechanisms regulate the mobilization and retention of metals by acid drainage. A geological and geomorphological survey was carried out and samples from the mining waste deposits and the marsh were collected to determine soil texture, Eh pH, organic matter, Cu, Pb, Zn and Fe content, and soil mineralogical composition. Metals in marsh plants were determined in above- and below-ground structures. In the mining waste deposits polymetallic sulphides were recognized where the oxidation and formation of oxy-hydroxides and sulphates of Fe, Cu, Pb and Zn occurs. Then, by the alteration of those minerals, the metals enter in solution and are mobilized with the surface drainage towards the marsh where adsorption in the soils fine fraction and organic matter and/or by plants occurs. Locally, in the mining waste deposits, the precipitation/dissolution of Cu, Pb, and Zn sulphates take place in small centripetal drainage basins. In topographically lower portions of the marsh desorption and removal of metals by tidal flow could also be happen. The results allow to concluding that the marsh adjacent to the mining waste deposits is a geochemically active environment that naturally mitigates the contamination caused by acid drainage. Fil: Idaszkin, Yanina Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Universidad Nacional de la Patagonia. Facultad de Ciencias Naturales. Sede Puerto Madryn; Argentina Fil: Carol, Eleonora Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina Fil: Alvarez, Maria del Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Universidad Nacional de la Patagonia. Facultad de Ciencias Naturales. Sede Puerto Madryn; Argentina

Published
2017

30. Arte y Ciencia: Proporción de los dedos de la mano

Author

González Hernández, Alejandro, Molina Alvarez, María del Pilar, González Hernández, Alejandro, and Molina Alvarez, María del Pilar

Abstract

This work has the purpose of presenting an interesting example to understand the concept of proportionality between two variables. Our example lies in the relationship of the length of each finger with its respective phalanges in order to find the so called “golden ratio”. We worked on photographs of several students’ right hands measuring the lengths of their fingers and phalanges. Both measurements were graphically related and we obtained good linear ratio with correlation coefficient of R2 = 0.999. We found the golden ratio only in the case of the little finger with a maximum error of 11%. We were not able to find this ratio in the case of the others fingers., En este trabajo presentamos un interesante ejemplo para entender la proporcionalidad entre dos variables. Nuestro ejemplo consistió en estudiar la relación que existe entre la longitud de los dedos de la mano con sus falanges con el propósito de encontrar la llamada “proporción aurea” entre estas longitudes. Para ello, se trabajó con las fotografías de las manos derechas de varios estudiantes, midiendo las longitudes de sus dedos y sus respectivas falanges. Ambas mediciones se graficaron obteniéndose buenas relaciones de proporcionalidad con coeficientes de correlación del orden R2 = 0.999. La proporcionalidad aurea solo se encontró para el dedo meñique, con un error máximo del 11%. Para los otros dedos no se pudo encontrar esta proporcionalidad.

Published
2017

32. Hidrogeología del sur de Península de Valdés, Chubut, Argentina

Author

Alvarez, María del Pilar, Hernández, Mario Alberto, and Bilmes, Andrés

Subjects
GEOLOGIA, Península Valdes, Formación Puerto Madryn, Hidrogeología
Abstract

Fil: Alvarez, María del Pilar. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Hernández, Mario Alberto. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Bilmes, Andrés. Centro de Investigaciones Geológicas (CIG). Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina

Published
2014

33. Diagnóstico y criterios hidrogeológicos en la gestión de residuos sólidos urbanos del noreste de la provincia de Buenos Aires

Author

Trovatto, María Marta, Alvarez, María del Pilar, Solero, Claudia, Hernández, Mario Alberto, and González, Nilda

Subjects
GEOLOGIA, Residuos urbanos, Hidrogeología ambiental, Escala regional, Criterios hidrogeológicos
Abstract

Fil: Trovatto, María Marta. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Alvarez, María del Pilar. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Solero, Claudia. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Hernández, Mario Alberto. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: González, Nilda. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina

Published
2014

34. From the presence of arsenic in natural waters to HACRE

Author

Hernández, Mario Alberto, González, Nilda, Trovatto, María Marta, and Alvarez, María del Pilar

Subjects
GEOLOGIA, Water regulation, HACRE, Natural waters, Arsenic
Abstract

Fil: Hernández, Mario Alberto. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: González, Nilda. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Trovatto, María Marta. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Alvarez, María del Pilar. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina

Published
2014

37. Estimación de la recarga en zonas áridas según distintos métodos : área medanosa del Sur de Península Valdés

Author

Alvarez, María del Pilar, Hernández, Mario Alberto, Trovatto, María Marta, and González, Nilda

Subjects
GEOLOGIA, Patagonia Extrandina, Recarga, Zonas áridas, Médanos, Peninsula Valdés
Abstract

Fil: Alvarez, María del Pilar. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Hernández, Mario Alberto. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Trovatto, María Marta. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: González, Nilda. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina

Published
2013

38. Evidencias hidrodinámicas de explotación intensiva en cuencas del Noreste de la provincia de Buenos Aires

Author

Trovatto, María Marta, Alvarez, María del Pilar, González, Nilda, and Hernández, Mario Alberto

Subjects
Explotación intensiva, GEOLOGIA, Usos, Hidrodinámica, Hidrogeología
Abstract

Fil: Trovatto, María Marta. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Alvarez, María del Pilar. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: González, Nilda. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Hernández, Mario Alberto. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina

Published
2013

39. El programa de Geohidrología Comparada en la cuenca inferior del río Uruguay (Argentina-Uruguay)

Author

Hernández, Mario Alberto, Montaño Xavier, Jorge, González, Nilda, Collazo, Paula, Trovatto, María Marta, Hernández, Lisandro, Alvarez, María del Pilar, and Montaño, Mauricio

Subjects
GEOLOGIA, Programación, Planning, Río Uruguay basin, Cuenca río Uruguay, Geohydrology, Geohidrología
Abstract

Fil: Hernández, Mario Alberto. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Montaño Xavier, Jorge. Facultad de Ciencias. Universidad de la República Fil: González, Nilda. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Collazo, Paula. Facultad de Ciencias. Universidad de la República Fil: Trovatto, María Marta. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Hernández, Lisandro. Cátedra de Fundamentos de Geología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Alvarez, María del Pilar. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Montaño, Mauricio. Facultad de Ciencias. Universidad de la República

Published
2012

42. La escultura solar

Author

Molina Alvarez, María del Pilar and Tous Olagorta, Francisco Javier

Subjects
Humanidades y Artes
Published
2007

44. Diallel crossing among maize populations for resistance to fall armyworm

Author

Alvarez, María del Pilar and Miranda Filho, José Branco de

Subjects
partial diallel, dialelo parcial, germoplasma, genetic resistance, germplasm, resistência genética
Abstract

Among the insects infecting the maize (Zea mays L.) crop in Brazil, the fall armyworm (Spodoptera frugiperda Smith, 1797, Lepdoptera: Noctuidae) is considered one of the most important because it causes the highest damage to yield. Genetic resistance to the fall armyworm has be an effective control strategy. The main objective of this work was to evaluate new germplasm sources for resistance to the fall armyworm, the key pest for the maize crop in Brazil. A partial diallel design between 20 varieties of Brazilian germplasm and nine exotic and semi-exotic varieties of different origin was used. The 180 crosses and 29 parental varieties along with two commercial checks were evaluated in three locations in the State of São Paulo State (Brasil). Fall armyworm resistance (FAWR) under artificial and natural infestations, grain yield (GY), and plant height (PH) were analyzed. The populations CMS14C and MIRT, and hybrid São José x MIRT showed the highest resistance, with values of 1.8, 1.7 and 1.4, respectively. Populations PMI9401 and PR91B, and the hybrid CMS14C x (B97xITU) had best yields, with 4893, 3858 and 5677 kg ha-1, respectively. Heterosis ranged from -28% to 47% for FAWR and from -21% to 125% for GY, with mean values of -0,43% and 31%, respectively. Genotype by environment interaction was not significant for FAWR. The effects of varieties and heterosis were significant for all traits, showing that both additive and dominance effects may be important as sources of variation. For FAWR, only specific heterosis presented significance, suggesting strong genetic divergence between specific pairs of parental populations. Brasilian populations PMI9302 and São José, and the exotic population PR91B presented high performance per se, and also in croses for FAWR and GY. Crosses PMI9401 x (Cuba110 x EsalqPB1) and São José x MIRT presented high specific heterosis effects for both characters. These populations can be useful to be introgressed in maize breeding programs. Dentre as pragas que infestam a cultura de milho (Zea mays L.) no Brasil, destaca-se a lagarta do cartucho (Spodoptera frugiperda Smith, 1797, Lepdoptera: Noctuidae), considerada como a praga chave por ser a que produz o maior dano. A utilização de cultivares resistentes constitui um método de controle eficiente. O principal objetivo deste trabalho foi a avaliação de novas fontes de germoplasma para resistência à lagarta do cartucho, praga chave da cultura de milho no Brasil. Foi utilizado um esquema dialélico parcial entre 20 populações representantes de germoplasma brasileiro e nove populações exóticas e semi-exóticas de diferentes origens. Os 180 híbridos e as 29 variedades genitoras, junto com duas testemunhas comerciais, foram avaliados em três locais no Estado de São Paulo (Brasil). Foram analizados os caracteres resistência à lagarta do cartucho (RLC), sob infestação artificial e natural, produtividade de grãos (PG) e altura de planta (AP). As populações CMS14C e MIRT, e o híbrido São José x MIRT apresentaram a maior resistência, com valores de 1,8 , 1,7 e 1,4, respectivamente. As populações PMI9401 e PR91B, e o híbrido CMS14C x (B97 x ITU) tiveram a maior produtividade, com 4893, 3858 e 5677 kg ha-1, respectivamente. Os valores de heterose foram de -28% a 47% para RLC e de -21% a 125% para PG, com valores médios de -0,43% e 31%, respectivamente. O caráter RLC não apresentou interação genótipo x ambiente significativa. Os efeitos de variedades e de heterose foram significativos para os três caracteres, indicando que tanto os efeitos aditivos quanto os de dominância podem ser importantes como fontes de variação. Para FAWR, somente a heterose específica foi significativa, sugerindo uma forte divergência genética entre pares específicos de populações parentais. As populações brasileiras PMI9302 e São José, e a população exótica PR91B apresentaram boa performance per se e em cruzamentos para resistência e produtividade. Os híbridos PMI9401 x (Cuba110 x ESALQ-PB1) e (São José x MIRT) apresentaram altos efeitos de heterose específica para ambos caracteres. Estes materiais podem ser promissores para sua incorporação em programas de melhoramento.

Published
2002

48. Tracking Organomineralization Processes from Living Microbial Mats to Fossil Microbialites.

Author

Eymard, Inès, Alvarez, María del Pilar, Bilmes, Andrés, Vasconcelos, Crisogono, and Ariztegui, Daniel

Subjects
*MICROBIAL mats, *CARBONATE minerals, *CALCITE, *FOSSILS, *ORGANIC compounds, *CYTOPLASMIC filaments
Abstract

Geneses of microbialites and, more precisely, lithification of microbial mats have been studied in different settings to improve the recognition of biogenicity in the fossil record. Living microbial mats and fossil microbialites associated with older paleoshorelines have been studied in the continental Maquinchao Basin in southernmost South America. Here, we investigate carbonate crusts from a former pond where active mineralizing microbial mats have been previously studied. Petrographic observations revealed the presence of abundant erect and nonerect microfilaments and molds with diameters varying from 6 to 8 micrometers. Additionally, smaller pores and organic matter (OM) remains have been identified in areas containing less filaments and being dominated by carbonate. A Mg, Al and Si-rich phase has also been identified in the carbonate matrix associated with the dominant micritic calcite. Moreover, mineralized sheaths contain mixed carbonate (calcite) with Mg, Al and Si, where the latter elements are associated with authigenic clays. The presence of mineralized sheaths further attests to biologically induced processes during the uptake of CO2 by photosynthetic microorganisms. Additionally, the high density of the micritic phase supports the subsequent mineralization by nonphotosynthetic microorganisms and/or physicochemical processes, such as evaporation. Since the micritic filament microstructure of these recent crusts is very similar to that observed in fossil microbialites, they can be used to bridge the gap between living mats and fossil buildups. [ABSTRACT FROM AUTHOR]

Published
2020
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