Entre Rios Province Research Articles

INDAGAÇÕES SOBRE AS MUDANÇAS ACONTECIDAS NO DESENVOLVIMENTO DO TURISMO NA CIDADE DE SAN JOSÉ, PROVÍNCIA DE ENTRE RIOS, ARGENTINA

O documento apresenta os resultados de uma pesquisa sobre o desenvolvimento de um destino emergente da Argentina. Justificou-se pela necessidade de realizar uma contribuição a respeito da relação existente entre o turismo, a partir de uma análise sistêmica, e o desenvolvimento local na tentativa de desvendar o surgimento de iniciativas, ou mudanças, e implementação de políticas e estratégias de desenvolvimento. Trata-se de um estudo de caso realizado na cidade de San José, província de Entre Rios entre os anos 2004 e 2009. Tentou-se analisar o impacto sócio-econômico em relação ao emprego, os empreendimentos e investimentos, assim como a contribuição refletida nos benefícios que ocasionou, em particular, na população residente.

CO2 emissions from a municipal site for final disposal of solid waste in Gualeguaychu, Entre Rios Province, Argentina

This paper estimates CO2 fluxes in a municipal site for final disposal of solid waste, located in Gualeguaychu, Argentina. Estimations were made using the accumulation chamber methods, which had been calibrated previously in laboratory. CO2 fluxes ranged from 31 to 331 g m−2 day−1. Three different populations were identified: background soil gases averaging 46 g m−2 day−1, intermediate anomalous values averaging 110 g m−2 day−1 and high anomalous values averaging 270 g m−2 day−1. Gas samples to a depth of 20 cm were also taken. Gas fractions, XCO2 < 0.1, XCH4 < 0.01, XN2 ~0.71 and XO2 ~0.21, δ13C of CO2 (−34 to −18‰), as well as age of waste emplacement, suggest that the study site may be at the final stage of aerobic biodegradation. In a first approach, and following the downstream direction of groundwater flow, alkalinity and δ13C of dissolved inorganic carbon (−15 to 4‰) were observed to increase when groundwater passed through the disposal site. This suggests that the CO2 generated by waste biodegradation dissolves or that dissolved organic matter appears as a result of leachate degradation.

Magnetotellurics applied to the study of the Guaraní aquifer in Entre Ríos Province, N–E Argentina

Abstract The South American Guarani Aquifer System covers the entire Parana basin and part of the Chaco-Parana basin. This system is one of the most important groundwater reservoirs; it is shared by four neighboring countries covering an area larger than one million square kilometers. The geological units closely related to the Guarani Aquifer are the Piramboia and Botucatu Formations that consist of Triassic–Jurassic aeolian, fluvial and lacustrine sandstones, and the Serra Geral basalts with clastic intercalations. Serra Geral, an effusive Cretaceous complex, covers the sandstones and provides a high degree of confinement to the system. This paper presents the interpretation of magnetotelluric (MT) data collected during 2007–2008 in Entre Rios Province, Argentina. These data, recorded in three profiles, mainly provide the depth to the crystalline basement, determinant for the presence of aquifer-related sediments. Models showed that the discrimination of the basalts strongly depends on local electrical characteristics. Model information is quite consistent with the information from oil and thermal wells located close to the profiles.

The immature stages of the biting midge Culicoides debilipalpis Lutz (Diptera: Ceratopogonidae)

The fourth instar larva and pupa of Culicoides debilipalpis Lutz, 1913 are described, illustrated, and photomicrographed from material collected in tree-holes of Salix sp. in Entre Rios Province, Argentina by using binocular, phase-contrast, and scanning electron microscopy. Measurements of instars I–IV are also presented. The larva shows features typical to carnivorous-predatory larvae, as well as characters typical of larvae occurring in tree holes and clean water. Details on larval biology, habitat, and feeding behavior are given.

Toxigenic fungi in maize (maize) stored in hermetic plastic bags

In Argentina, 35 million tonnes are stored in hermetic plastic bags. Inside the bags, the modified atmosphere has an effect on stored grains, insects and fungi. Fungi taxa and species typically isolated from stored grains consist of species of the genera Aspergillus, Penicillium, Fusarium and xerophilic fungi, some of which are potential producers of mycotoxins. The province of Entre Rios, Argentina, is an important area of study because much of the production of maize stored in bags is supplying the poultry industry demand. The objective of this study was to identify mycotoxigenic fungi species in maize stored in hermetic plastic bags, located in three Departments of Entre Rios province. A total of 176 samples of maize were analyzed, stored in 23 bags located in the Departments of Parana (west region), La Paz (northern region) and Tala (central region). Two potential producers of aflatoxins ( A. flavus and A. parasiticus ) and a potential producer of fumonisins ( F. verticillioides ) were identified in all the plastics bags evaluated. In La Paz Department, Aspergillus spp. and F. verticillioides were detected in 66.7% and 54% of samples, respectively. In Tala Department, Aspergillus spp. were detected in 63.3% and F. verticillioides in 43.6%, while in Parana, Aspergillus spp. was detected in 88.2% of the evaluated samples and F. verticillioides in 41.4% of the samples. The results revealed that mycotoxigenic fungi can develop in maize stored in hermetic plastic bags. This implies a potential risk of contamination with aflatoxins and /or fumonisins in the grain lots stored inside these bags. Keywords : Mycotoxigenic fungi, Grain, Plastic silo-bag, Grain Quality, Fungi spoilage

The Tayassuidae (Mammalia, Artiodactyla) from the Quaternary of Entre Rios Province. A palaeofaunal review in Argentina

Fil: Gasparini, German Mariano. Consejo Nacional de Investigaciones Cientificas y Tecnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina

Genetic variability of Phytophthora sojae isolates from Argentina

Phytophthora sojae causes root and stem rot, one of the most important diseases of soybean worldwide. Genetic diversity of 32 Phytophthora sojae isolates of different geographic origin from Argentina was evaluated with RAPD markers. The isolates were collected from diseased soybean plants and soil samples from Santa Fe, Buenos Aires, C6rdoba and Entre Rios provinces, in the Pampeana Region. DNA was amplified with 20 decanucleotides primers. Seven primers amplified 49 fragments, of which 35 were polymorphic, indicating high variability. RAPD analysis detected intraspecific variability even among isolates of the same geographic origin.

Geographical distribution of wild Daucus species in the natural grasslands of the Argentinian pampas

Three wild carrot species have been reported in the argentinian flora: Daucus montanus Humb. et Bonpl. ex Schult., D. montevidensis Link ex Sprengel and D. pusillus Michx. There is a discrepancy among authors about the distinctive morphological traits of the last two species; thus, it is difficult to ascertain if they are truly two distinct taxa. Based on the available literature and in the search of a paradigmatic site, four collection trips were carried out in 2004 and 2005 in Buenos Aires and Southern Entre Rios provinces. Populations were sampled at 30 sites, and local environmental parameters and associated plant species were recorded. Morphological observations and chromosome counts were carried out on 10 plants/population. Three morphological phenotypes were distinguished: one in 18 populations, all with 2n = 2x = 18, and two in the remaining 12, with 2n = 2x = 22 or aneusomaty (2n = 2x = 20, 22). Populations of the first phenotype were assigned to wild D. carota and the rest, tentatively, to D. pusillus (D. montevidensis?), till further evaluations are carried out in test sites to verify this tentative conclusion.

Bone-Munching Symbionts Found in the Abyss

south from its origin in Brazil, marking the borders of Brazil, Paraguay, and Argentina and draining South America's second largest watershed. it descends through rainforest to the Great Chaco savannah and on to the delta wetlands, a series of human interventions transform the river's ecology. In September 2005, a coalition of scientists, fishermen, and environmentalists from Entre Rios Province, Argentina, met at the Senate building in Parana City to report that fish populations are collapsing and to demand the enactment of conservation measures currently before the second chamber. The growth of soya plantations and a series of upstream dams have brought changes to the Parana's hydrology. As the agrarian frontier expands, we are seeing heavy floods and prolonged droughts linked to Par na River feels the strain

Ruptura e continuidade com o passado : bens patrimoniais e turismo em duas cidades relocalizadas

This paper comparatively analyses the experiences of urban populations of Federacion (Entre Rios Province, Argentina) and Ita (state of Santa Catarina, Brazil), which were relocated because of the constructions, respectively, of the bi-national Argentine and Uruguayan dam Salto Grande and the Brazilian dam Ita. Its main focus is the manner in which different social agents in these relocated cities represent and deal with part of their tangible and intangible patrimony related to the former settlements and urban traditions, which existed before the flood resulting from the construction of the aforementioned dams. This analysis focuses primaly on the tourist venture projects currently being planned or implemented in both cities.

Amphibians occurring in soybean and implications for biological control in Argentina

Abstract The diversity and diet composition of amphibians were examined in soybean of the Cordoba and Entre Rios Provinces of Argentina, investigating their potential as biological control agents of herbivores species. A total of 15 anuran species belonging to three families were detected in the two crops. The numbers of individuals found in soybean and the variety of arthropods they consumed suggest that anuran populations could be important biological control factors of soybean arthropods.

Soil quality: a new index based on microbiological and biochemical parameters

The objective of this investigation was to evaluate some chemical, physical, biological and biochemical parameters and to determine a minimum data set to establish a soil quality index. Four different forms of management (native forest soil, soil deforested in 1982 and 1983 and under natural pasture for the last 8–10 years, soil deforested 26 years ago and under no-tillage for 6 years, and soil deforested 40 years ago and under conventional tillage) were established in an experimental site located in Entre Rios Province, Argentina in a Vertic Argiudoll soil. Soils sampled from the different treatments were monitored for their organic C, total N and extractable P contents and for aggregate stability, respiration C, dehydrogenase, urease, protease, acid phosphomonoesterase, β-glucosidase and arysulphatase activities. Different contents of organic C and total N between cultivated treatments and the forest soil indicated the extractive effect of cultivation and agricultural practices during different periods of time. Organic C presented significant correlations with most of the others properties. Among the various polynomial expressions that could be formulated, one (organic C=–0.4008 arylsulphatase+0.4153 dehydrogenase+0.4033 acid phosphomonoesterase+0.4916 β-glucosidase) had a R2 value which did not differ from that of the complete model.

Mycoflora and mycotoxins natural occurrence in corn from entre rios province, Argentina.

Corn samples were collected in 1999 from three departments of Entre Réos province, Argentina, and were surveyed for mould contamination and natural occurrence ofFusarium mycotoxins, ochratoxin A and aflatoxins.Fusarium verticillioides was the most prevalent fungal species recorded at all departments. Zearalenone, deoxynivalenol and ochratoxin A were not found in any samples. Only one of the 52 corn samples analysed was contaminated with aflatoxin B1 (17 μg/kg). Fumonisin B1 was found in 58 % of samples (range of positive samples: 47- 3,347 μg/kg), fumonisin B2 in 33.0 % (range of positive samples: 23-537 μg/kg) and fumonisin B3 in 25.0 % (range of positive samples: 24-287 μg/kg) of them. This is the first report on the natural occurrence of mycotoxins in corn from Entre Ríos province, Argentina. Levels of fumonisins were lower than detected in other Argentinian provinces.

Mycoflora and mycotoxins natural occurrence in corn from entre rios province, Argentina.

Corn samples were collected in 1999 from three departments of Entre Réos province, Argentina, and were surveyed for mould contamination and natural occurrence ofFusarium mycotoxins, ochratoxin A and aflatoxins.Fusarium verticillioides was the most prevalent fungal species recorded at all departments. Zearalenone, deoxynivalenol and ochratoxin A were not found in any samples. Only one of the 52 corn samples analysed was contaminated with aflatoxin B1 (17 μg/kg). Fumonisin B1 was found in 58 % of samples (range of positive samples: 47- 3,347 μg/kg), fumonisin B2 in 33.0 % (range of positive samples: 23-537 μg/kg) and fumonisin B3 in 25.0 % (range of positive samples: 24-287 μg/kg) of them. This is the first report on the natural occurrence of mycotoxins in corn from Entre Ríos province, Argentina. Levels of fumonisins were lower than detected in other Argentinian provinces.

Sesquiterpene lactones from Chrysolaena platensis.

Fil: Pollora, Genaro Cesar. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Tucuman. Instituto de Quimica del Noroeste. Universidad Nacional de Tucuman. Facultad de Bioquimica, Quimica y Farmacia. Instituto de Quimica del Noroeste; Argentina

FITOLITOS DE POACEAE DE ARGENTINA. III. FITOLITOS FOLIARES DE ESPECIES DEL GÉNERO PASPALUM (PANICEAE) EN LA PROVINCIA DE ENTRE RÍOS

Zucol A. F. 2000. Phytoliths of Poaceae from Argentina: III. Leaf phytoliths of some species of the genus Paspalum (Paniceae), from Entre Rios province. Darwiniana 38(1-2): 11-32. Foliar phytolith morphology of 8 species of Paspalum: P. dilatatum Poir., P. lividum Trin. ex Schltdl., P. nicorae Parodi, P. notatum Flugge, P. plicatulum Michx., P. saurae Parodi, P. unispicatum Nash and P. urvillei Steud., present in the prairie of Entre Rios Province, was described. Cluster analysis (UPGMA) and ordination by principal component analysis (PCA) were performed on 49 morphological characters from the 8 phytolith assemblages (OTUs). Three groups were found, the first one with P. unispicatum, the second one with P. lividum and the third group with (P. dilatatum + (P. notatum + P. saurae)) and (P. nicorae + (P. plicatulum + P. urvillei)) assemblage subgroups. The 8 phytolith assemblages show Panicoid affinity (sensu Twiss, 1992). This analyses supported the infrageneric classification, with an exception in the Dilatata group assemblages ( P.dilatatum and P.urvillei).

Cytogenetic studies inSinipta dalmani Stal (Orthoptera: Acrididae). III: Pericentric M4 inversion affecting morphological traits

Three population samples ofSinipta dalmani from Entre Rios Province in Argentina polymorphic for the M4 inversion were analysed for five body-size-related traits: total body, tegmina, third femur, third tibia and thorax lengths. MANOVA and individual ANOVA revealed that there were significant differences between karyomorphs for total body and thorax lengths. The univariate analyses also revealed significant differences for tibia length, showing an important influence of correlated traits. The influence of the M4 inversion leads to a significant reduction of body size in the homozygotes for the M4 inversion. Comparison of mean values for tibia length through Scheffe’s method revealed that (i) heterozygotes were intermediate between homozygotes, and (ii) there were significant differences between homozygotes. These results suggest that the differences between karyomorphs are largely additive. On the contrary, the heterozygote mean value for thorax length differs significantly from the average of the two homozygotes, showing that the dominance effects are mainly related with the differences between karyomorphs. This parametric comparison using total body length data revealed only marginally significant differences. Regression analysis of morphological traits on number of inverted chromosomes revealed that there was a dose effect only for third tibia length.

The epiphytic algae on floating macrophytes of a Paran� river floodplain lake

We describe the composition and seasonal (1993–1994) changes of epiphytic algae on the submerged parts of macrophytes (Eichhornia crassipes (Mart.) Solms-Loubach, Salvinia rotundifolia Willd., Lemna gibba L. and Ricciocarpos natans (L.) Corda) of a shallow lake from Entre Rios province, Argentina (33°48′S, 58°57′W), permanently connected to the Parana river.

Effects of chromosome rearrangements on sperm formation inSinipta dalmani(Orthoptera: Acrididae)

SUMMARYThe populations of National Park «El Palmar» (Entre Rios Province, Argentina) of Sinipta dalmani are polymorphic for a pericentric inversion and a centric fusion (REMIS 1989b, 1990). The percentage of normal and abnormal (macro and micro) spermatids was asessed in order to evaluate the influence of these rearrangements on sperm formation. The pericentric inversion does not associate significantly with macrospermatid formation. On the contrary, microspermatid production and a significant increase in the frequency of macrospermatids are observed in centric fusion carriers. The DNA content of giant spermatids was mainly 2c, suggesting that there may be any meiotic misbehaviour during meiosis. However, 3c to 5c macrospermatids were also found; hence, other mechanism, such as cell fusion, may be involved in the production of abnormal sperm. Although this influence may affect any component of fitness in a negative way, it ought to be counterbalanced by any adaptive effect or else by meiotic drive in orde...

New Ctenomys karyotypes (Rodentia, Octodontidae) from north-eastern Argentina and from Paraguay confirm the extreme chromosomal multiformity of the genus

Bone-marrow karyotypes of 68 specimens of the subterranean octodontid rodent genus Ctenomys from 16 different populations of north east Argentina and one from Paraguay have been studied. A surprising variety of chromosome numbers was found, ranging from 2n=42 to 2n=70. Some of the karyomorphs are clearly assigned to named species by topotypy: C. conoveris 2n=50, FN=56; C. argentinus, 2n=44, FN=54; C. perrensi, 2n=50, FN=84; C. dorbignyi, 2n=70, FN=84; C. roigi, 2n=48, FN=80; C. yolandae, 2n=50, FN=78. Four populations of Corrientes Province similar in morphology to C. perrensi were found to be polymorphic and polytypic; they maintain the same FN=84, but diploid numbers increase from 2n=54 to 2n=58 from SW to the NE, thus suggesting Robertsonian rearrangements. In the middle of this cline, a stable karyomorph of 2n=62, FN=84 was found in two different populations, suggesting to belong to an undescribed species. Another karyomorph of 2n=42, FN=76 found in Curuzu Laurel, Corrientes, may also prove to represent another undescribed species. One karyomorph of 2n=52, FN=74, and another of 2n=56, FN=78 from Parana and Ubajaý (Entre Rios Province, Argentina) respectively are close to C. rionegrensis. The relationships among these karyomorphs is considered in light of data on sperm morphology. The hypothesis is advanced that karyotypic rearrangements among the FN=84 group may be the result of Robertsonian repatterning from a 2n=70 original widespread form. Fixation of chromosomal variants is correlated with patchy distribution and small size of unstable demes, and may or may not have resulted in reproductive isolation.