Zooplankton assemblages and hydrography in the spawning area of anchovy (Engraulis anchoita) off Río de la Plata estuary (Argentina - Uruguay)

2002 ◽  
Vol 53 (6) ◽  
pp. 1031 ◽  
Author(s):  
María Delia Viñas ◽  
Rubén M. Negri ◽  
Fernando C. Ramírez ◽  
Daniel Hernández
Keyword(s):  
Size Structure ◽  
Zooplankton Community ◽  
Buenos Aires Province ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Oithona Similis ◽  
First Feeding ◽  
Plankton Biomass ◽  
Positive Correlations

The massive spawning of anchovy (Engraulis anchoita) in Argentine waters takes place in spring in the coastal sector off the Buenos Aires Province, with the highest concentrations of spawners occurring in front of the Río de la Plata mouth. In October 1995, the size structure, composition and abundance of the zooplankton community was analyzed and related to the hydrography and the abundance of anchovy eggs. Oceanographic conditions were different from the recorded means for the season. A higher proportion of the colder and more saline shelf waters were present in the coastal area and strong haloclines were not observed. High values of plankton biomass were observed in the estuarine frontal area and in the weakly stratified waters of the median shelf. The cluster analysis of the stations gave rise to the formation of coastal (CA), transitional (TA) and shelf (SA) faunistic areas. Mesozooplankton smaller than 1 mm total length (TL) dominated the whole area. The copepods, Paracalanus spp. and Oithona similis, and the cladocerans, Evadne nordmanni and Podon spp., constituted the bulk of this mesozooplankton fraction. Oithona similis was the dominant species in the SA. The copepod, Acartia tonsa (1–2 mm TL), was extremely abundant in the estuarine front (more than 17 600 individuals m–3) followed by appendicularians, members of Pseudocalanidae, anchovy eggs and decapod larvae. Species of Calanidae (Calanoides carinatus and Calanus simillimus), the amphipod hyperiid, Themisto gaudichaudii, and the euphausiid, Euphausia lucens, largely dominated the macrozooplankton (>2 mm TL) in the TA and SA. In the CA, significant positive correlations between the abundance of small copepods (size ranges <1 and 1–2 mm) and anchovy eggs were found. Trophic implications of these findings for first-feeding anchovy larvae were discussed. The adequacy of the TA and SA as feeding ground for adults of anchovy was evaluated.

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 Golden mussel Limnoperna fortunei (Bivalvia: Mytilidae) distribution in the main hydrographical basins of Uruguay: update and predictions

2005 ◽  
Vol 77 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Ernesto Brugnoli ◽  
Juan Clemente ◽  
Lucía Boccardi ◽  
Ana Borthagaray ◽  
Fabrizio Scarabino
Keyword(s):  
Neotropical Region ◽  
Aquatic Systems ◽  
Abiotic Factor ◽  
Buenos Aires Province ◽  
Rio De La Plata ◽  
Limnoperna Fortunei ◽  
Río De La Plata ◽  
La Plata ◽  
Distribution Process ◽  
Golden Mussel

Limnoperna fortunei, an Asiatic rivers bivalve has become a worldwide problematic invasive species causing several water quality and macrofouling problems. In the Neotropical region it was first recorded in 1991 in the Río de la Plata coast, Buenos Aires province. Since this, it showed a quick upstream invasion into the principals aquatic systems of the Plata Basin. Nevertheless, there is not a study about its invasion and distribution process in aquatic systems of Uruguay. We describe the new records of Limnoperna fortunei in Uruguayan coast of Río de la Plata, Santa Lucía, Negro and Uruguay Rivers. With these results we aim to estimate its distributional limits for Uruguay main hydrographical basins. We also deal with the role of salinity as the main abiotic factor in limiting the east distribution of this mussel in Uruguayan coast of Río de la Plata and as a potential determinant of the "new" colonization on the Atlantic and the Merín Lagoon Basins. Its presence in the ecosystems not only can cause changes at the ecosystem level but also endanger the associated community, favoring the displacement and the disappearance of endemic species.

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 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

Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina

2012 ◽  
Vol 38 ◽  
pp. 57-70 ◽  
Author(s):  
Hans-Joachim Massonne ◽  
Jorge A. Dristas ◽  
Juan Cruz Martínez
Keyword(s):  
Buenos Aires ◽  
Buenos Aires Province ◽  
Rio De La Plata ◽  
Metamorphic Evolution ◽  
Río De La Plata ◽  
La Plata

Los caminos de la escritura negra en el Río de la Plata. Prólogo de George R. Andrews.

2010 ◽  
Author(s):  
Jacinto de Ventura de Molina
Keyword(s):  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata
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