scholarly journals Actinopterygii, Siluriformes, Loricariidae, Hypostomus aspilogaster (Cope, 1894). Distribution extension and first record for Argentina

Check List ◽  
2011 ◽  
Vol 7 (5) ◽  
pp. 596 ◽  
Author(s):  
Yamila P. Cardoso ◽  
Florencia Brancolini ◽  
Lucila Protogino ◽  
Marta Lizarralde
Keyword(s):  
Buenos Aires ◽  
First Record ◽  
Buenos Aires Province ◽  
Rio De La Plata ◽  
Southern Brazil ◽  
Río De La Plata ◽  
La Plata ◽  
La Plata Basin ◽  
Entre Rios ◽  
Uruguay River

The present work extends to Argentina the distribution of Hypostomus aspilogaster originally described from Uruguay River in southern Brazil. The examined specimens were sampled in the stream Mandisoví Grande, affluent of Uruguay River in Entre Ríos province, and in Punta Lara, from Río de la Plata basin, in Buenos Aires province, Argentina. This represents the first country record for this species. 

scholarly journals Histology and gametogenesis inHeleobia piscium(Cochliopidae) from the Multiple Use Reserve “Isla Martín García,” Buenos Aires, Argentina

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2548 ◽  
Author(s):  
Stella Maris Martin ◽  
Ana C. Díaz
Keyword(s):  
South America ◽  
Reproductive Cycle ◽  
Buenos Aires ◽  
Rio De La Plata ◽  
Multiple Use ◽  
Río De La Plata ◽  
Early Maturation ◽  
La Plata ◽  
Natural Reserve ◽  
Entre Rios

Heleobia piscium(d’Orbigny, 1835), a member of the Cochliopidae family found only in South America, is distributed from Entre Ríos, Delta del Paraná, and the littoral of the Río de la Plata down as far as to Punta Indio (Buenos Aires), the southernmost limit of the snail’s geographical distribution. To date, little information is available regarding the reproductive cycle of species within this family either in Argentina or throughout South America. The present work analyzed the histology of the reproductive system of the gonochoric speciesH. pisciumand determined the stages oogenesis and spermatogenesis under natural conditions. Specimens ofH. pisciumwere collected in the Multiple-Use Natural Reserve Isla Martín García, located in the Upper Río de la Plata estuary to the south of the mouth of the Uruguay River. The gametogenic cycle in both sexes was found to consist of the following stages: early maturation, maturation, and evacuation. The maturation period was found to extend from January to October and evacuation of the gametes to start in November and end in February (summer in the Southern Hemisphere). The results indicated theH. pisciumexhibit a reproductive cycle without a resting period.

The Service of William A. Harris at Buenos Aires 1846–1851

1960 ◽  
Vol 16 (3) ◽  
pp. 251-269
Author(s):  
William Dusenberry
Keyword(s):  
Buenos Aires ◽  
The United States ◽  
Buenos Aires Province ◽  
Rio De La Plata ◽  
Critical Periods ◽  
Río De La Plata ◽  
Entire Area ◽  
La Plata ◽  
The Government ◽  
Argentine History

William A. Harris ably served the United States as chargé d'affaires at Buenos Aires from June, 1846, until October, 1851, during one of the most critical periods in Argentine history. When he went to his post of duty, Argentina was suffering both from external and internal strife. France and England had intervened in affairs in the Río de la Plata, and had blockaded the coast. Relations between Argentina and two of her neighbors, Paraguay and Brazil, were strained. The government of Buenos Aires was fomenting civil war in Uruguay. There was mounting tension between Buenos Aires and the back country provinces. Public discontent prevailed within Buenos Aires Province. Foreign nationals residing there became increasingly apprehensive about the future of their business enterprises. The heavy hand of the violent caudillo, Juan Manuel de Rosas, Governor of Buenos Aires Province, was felt throughout the entire area of the Río de la Plata. His position was so strong that in most respects he controlled affairs of the whole Argentine Confederation, comprising fourteen provinces.

Cattle Raising in the Argentine Northeast: Corrientes,c.1750–1870

1988 ◽  
Vol 20 (2) ◽  
pp. 313-335 ◽  
Author(s):  
Thomas Whigham
Keyword(s):  
Buenos Aires ◽  
Late Nineteenth Century ◽  
Buenos Aires Province ◽  
Rio De La Plata ◽  
External Trade ◽  
Río De La Plata ◽  
Cattle Industry ◽  
La Plata ◽  
Refrigerated Transport ◽  
Independence Era

Though Argentina has long been synonymous with trackless pampas and teeming livestock herds, this common image requires some qualification. Before the late nineteenth century, when refrigerated transport made possible a large international market for Argentine beef, cattle played a less important role in the economy of the Río de la Plata than is usually assumed. Except for Buenos Aires province, where stockraising was predominant even in the colonial period, ranchers often had to struggle hard and insistently to find their niche in the overall commerce of the region. Grazing conditions were excellent in many areas of the Río de la Plata, but because the port of Buenos Aires always enjoyed a near-exclusive control over external trade, theporteñoseffectively blunted the development of any stockraising that threatened to compete with their own exports. In the northeastern provinces, this resulted in a cattle industry marked by technological backwardness and erratic growth. The chaotic politics of the post-independence era reinforced these conditions, though reform-minded ranchers and government officials consistently tried to improve provincial standards of stockraising.

scholarly journals Occurrence of dioctophymosis in canines within a riparian zone of the Río de La Plata watercourse, in Ensenada, Buenos Aires Province, Argentina

2017 ◽  
Vol 10 ◽  
pp. 43-50
Author(s):  
Nilda Ester Radman ◽  
María Inés Gamboa ◽  
Marcos Javier Butti ◽  
Marianela Blanco ◽  
Ana Rube ◽  
...  
Keyword(s):  
Buenos Aires ◽  
Riparian Zone ◽  
Buenos Aires Province ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata

scholarly journals Geographic variation of Moenkhausia bonita (Characiformes: Characidae) in the rio de la Plata basin, with distributional comments on M. intermedia

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
James Anyelo Vanegas-Ríos ◽  
Ricardo Britzke ◽  
Juan Marcos Mirande
Keyword(s):  
Distinct Group ◽  
Multivariate Methods ◽  
Rio De La Plata ◽  
Meristic Characters ◽  
Río De La Plata ◽  
La Plata ◽  
La Plata Basin ◽  
Bermejo Basin ◽  
Uruguay River ◽  
Canonical Analyses

ABSTRACT Moenkhausia bonita occurs in numerous additional localities from the Bermejo, Paraná, Paraguay, and Uruguay river basins. Given that this finding greatly expands the distributional range of M. bonita, we carried out an intraspecific comparison, using multivariate methods for 18 morphometric and eight meristic characters taken from a comprehensive sample of 536 specimens. All localities were distributed in four major geographic groups as follows: Bermejo, Paraná, Paraguay, and Uruguay. Results of the morphometric comparisons showed significant differences among the studied groups except between the Paraguay and Uruguay groups. Statistical differences in meristic values were found for most between-group comparisons, especially in those resulting from discriminant canonical analyses (DCA). Specimens from the Bermejo basin were the most distinct group in most morphological comparisons. However, the overall subtle differences found in body morphology likely reflect intraspecific variation within M. bonita and seem to be mainly influenced by spatial and environmental features of drainages. As M. bonita was previously identified as M. intermedia in the río de La Plata basin, distributional comments on the latter species in that basin are provided.

scholarly journals Mixed-stock and discriminant models use for assessing recruitment sources of estuarine fish populations in La Plata Basin (South America)

2019 ◽  
Vol 99 (06) ◽  
pp. 1429-1433
Author(s):  
Esteban Avigliano ◽  
Jorge Pisonero ◽  
Nerea Bordel ◽  
Alejandro Dománico ◽  
Alejandra Vanina Volpedo
Keyword(s):  
South America ◽  
Estuarine Fish ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
Data Set ◽  
Prochilodus Lineatus ◽  
La Plata ◽  
La Plata Basin ◽  
Recruitment Sources ◽  
Uruguay River

AbstractThe objective of this study was to identify potential recruitment sources of Prochilodus lineatus from freshwater areas (Paraná and Uruguay rivers) to estuarine population of the Río de la Plata Estuary (La Plata Basin, South America), considering young (age-1) and adult (age-7) fish. LA-ICP-MS chemical analysis of the otolith core (nine element:Ca ratios) of an unknown mixed sample from Río de la Plata Estuary (2011 and 2017) was compared with a young-of-year baseline data set (same cohort) and classified into freshwater nurseries (Paraná or Uruguay river) by using maximum classification-likelihood models (MLE and MCL) and quadratic discriminant analysis (QDA). Considering the three models used, the Uruguay River was the most important contributor for both young and adult populations. The young population (2011) was highly mixed with contributions between 31.7 to 68.3%, while the degree of mixing was found to decrease in 2017 (adult fish) from 97.1 to 100% contributions. The three employed methods showed comparable estimates, however, the QDA showed a high similarity with the MCL model, suggesting sensitivity to evaluate small contributions, unlike the MLE method. Our results show the potential application of maximum likelihood mixture models and QDA for determining the relative importance of recruitment sources of fish in estuarine waters of the La Plata Basin.

scholarly journals A 200 años de la Constitución de 1819. Breve comentario de su historia

2019 ◽  
Vol 11 (11) ◽  
pp. 280
Author(s):  
Diego Gabriel Presa
Keyword(s):  
Buenos Aires ◽  
Rio De La Plata ◽  
Santa Fe ◽  
Río De La Plata ◽  
La Plata ◽  
Del Rio ◽  
Entre Rios

El 22 de abril de 1819 el Congreso de Tucumán, sesionaba en Buenos Aires y sanciona el primer texto constitucional orgánico para las Provincias Unidas del Rio de La Plata  el Estado; texto que no van a aceptar las provincias litorales de la Banda Oriental del Uruguay –no solo por no coincidir con el mismo, sino por estar ocupada por los portugueses desde 1816 a instancias de Buenos Aires-  y las provincias de Corrientes, Entre Ríos y Santa Fe. No obstante este texto constitucional, que es el primero en su estilo,   llevara al camino a la Constitución de 1853. Hoy doscientos años después podemos recorrer su articulado y ver dicho texto en profundidad, donde muchas de las atribuciones de los poderes del estado, se fueron manteniendo en los textos constitucionales que le sucedieron, hasta terminar en artículos vigentes en la Constitución Nacional de 1853 y sus reformas.  

Acido delta-aminolevulínico dehidrasa (ALA-D) como biomarcador de exposición a plomo en peces

2008 ◽  
Author(s):  
◽  
Paula Edith Lombardi
Keyword(s):  
Cyprinus Carpio ◽  
Buenos Aires ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
Prochilodus Lineatus ◽  
La Plata ◽  
Del Rio

La actividad de la enzima ácido δ-aminolevulínico dehidrasa (ALA-D) es un reconocido biomarcador específico de exposición a plomo. Debido a sus características ha sido utilizado en estudios de monitoreo ambiental para evaluar la exposición a plomo en diversos organismos, entre ellos peces. El principal objetivo del presente trabajo de tesis fue validar un método de evaluación general de riesgo ecotoxicológico por exposición a plomo en poblaciones naturales de peces. Para tal fin se seleccionaron tres especies recolectadas del río de la Plata: Prochilodus lineatus (sábalo), Leporinus obtusidens (boga) y Cyprinus carpio (carpa). Las zonas de muestreo elegidas fueron: Berazategui y Berisso ubicadas cerca de las emisiones de residuos cloacales provenientes de las ciudades de Buenos Aires y La Plata. La tercera, Atalaya, libre de emisiones cloacales, pero sujeta a emisiones diversas, todas ellas, de origen antropogénico. Los muestreos se realizaron entre junio de 2002 y mayo de 2004. En primera instancia se caracterizaron diversos parámetros de la enzima ALA-D en muestras de sangre y de tejido hepático. Los resultados obtenidos mostraron características similares en la enzima sanguínea de todas las especies estudiadas. Lo mismo se observó para la enzima hepática. La comparación entre tejidos mostró diferencias en el valor de Km, siendo menor para la enzima hepática. Posteriormente, se procedió a validar el uso de la enzima como parámetro biomarcador de exposición a plomo en estudios de campo.

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