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 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 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 Population structure of Uncancylus concentricus (d'Orbigny, 1835) (Ancylidae, Pulmonata, Basommatophora) in the Multiple Use Reserve Martín García Island, Upper Río de la Plata, Argentina

2012 ◽  
Vol 72 (1) ◽  
pp. 65-70 ◽  
Author(s):  
SM Martín ◽  
AC Díaz
Keyword(s):  
Size Range ◽  
Sampling Period ◽  
Rio De La Plata ◽  
Multiple Use ◽  
Río De La Plata ◽  
La Plata ◽  
Natural Reserve ◽  
Variable Distribution ◽  
In The Wild ◽  
Uruguay River

The present work analyzes the population dynamics of Uncancylus concentricus in natural conditions in the northeastern coastal area of the Multiple Use Natural Reserve Isla Martín García (Beach of Basural), Buenos Aires, Argentina. Martín García Island is located in the Upper Río de La Plata, to the south of the mouth of the Uruguay River (34° 11' 25" S and 58° 15'38" W). Monthly collections were made from August 2005 to December 2006. The size frequency of the U. concentricus population throughout the sampling period ranges from 1.2 to 8.3 m. The changes in the size frequencies throughout the months surveyed indicate a variable distribution pattern because of the increase and decrease in water flow, but we observed a peak in the frequency of individuals within the size range 3.5 to 4.5 mm in the population. It can be concluded that this species lives for at least a year in the wild since the juveniles are highly abundant in spring and summer.

scholarly journals Airborne PCB patterns and urban scale in the Southern Río de la Plata Basin, Argentina

2016 ◽  
Vol 572 ◽  
pp. 16-22 ◽  
Author(s):  
Malena J. Astoviza ◽  
Natalia Cappelletti ◽  
Claudio Bilos ◽  
Maria C. Migoya ◽  
Juan C. Colombo
Keyword(s):  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
La Plata Basin

Accumulation of human pharmaceuticals and activity of biotransformation enzymes in fish from two areas of the lower Rio de la Plata Basin

Chemosphere ◽  
2021 ◽  
Vol 266 ◽  
pp. 129012
Author(s):  
M. Rojo ◽  
D. Cristos ◽  
P. González ◽  
V. López-Aca ◽  
A. Dománico ◽  
...  
Keyword(s):  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Biotransformation Enzymes ◽  
La Plata Basin

Early diagenetic alterations of sterol biomarkers during particle settling and burial in polluted and pristine areas of the Rio de la Plata Basin

2018 ◽  
Vol 117 ◽  
pp. 1-11 ◽  
Author(s):  
Eric Demian Speranza ◽  
Manuel Colombo ◽  
Carlos Norberto Skorupka ◽  
Juan Carlos Colombo
Keyword(s):  
Rio De La Plata ◽  
Particle Settling ◽  
Río De La Plata ◽  
La Plata ◽  
La Plata Basin
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