scholarly journals Importance of the Rio de la Plata estuarine front (southwestern Atlantic Ocean) in the feeding ecology of Argentine anchovy, Engraulis anchoita (Clupeiformes, Clupeidae

2011 ◽  
Vol 39 (2) ◽  
pp. 205-213 ◽  
Author(s):  
Luciano N. Padovani ◽  
Maria D. Vinas ◽  
Marcelo Pajaro
Keyword(s):  
Atlantic Ocean ◽  
Feeding Ecology ◽  
Rio De La Plata ◽  
Southwestern Atlantic ◽  
Río De La Plata ◽  
La Plata ◽  
Southwestern Atlantic Ocean

scholarly journals An empirical remote sensing algorithm for retrieving total suspended matter in a large estuarine region

2019 ◽  
Vol 83 (1) ◽  
pp. 53
Author(s):  
Martina D. Camiolo ◽  
Ezequiel Cozzolino ◽  
Ana I. Dogliotti ◽  
Claudia G. Simionato ◽  
Carlos A. Lasta
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Pearson Correlation ◽  
Biological Study ◽  
Spatial And Temporal Variability ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Suspended Particulate ◽  
Southwestern Atlantic Ocean

The Río de la Plata is a large, shallow estuary located at approximately 35°S and flowing into the southwestern Atlantic Ocean. It carries a high amount of nutrients and suspended particulate matter, both organic and inorganic, to the adjacent shelf waters and is considered among the most turbid estuarine systems in the world. Knowledge of the concentration and spatial and temporal variability of these materials is critical for any biological study in the Río de la Plata. In this work, the relationship between suspended particulate matter and turbidity is empirically established in order to derive suspended particulate matter maps from satellite data (MODIS-Aqua) for the Río de la Plata region. A strong correlation between suspended particulate matter and turbidity was found (Pearson correlation coefficient =0.91) and the linear regression (slope =0.76 and intercepts =12.78, R2=0.83) explained 83% of the variance. The validation of the empirical algorithm, using co-located and coincident satellite and in situ measurements, showed good results with a low mean absolute error (14.60%) and a small and positive bias (3.04%), indicating that the estimated suspended particulate matter values tend to slightly overestimate the field values.

Stable oxygen isotopes reveal habitat use by marine mammals in the Río de la Plata estuary and adjoining Atlantic Ocean

2020 ◽  
Vol 238 ◽  
pp. 106708
Author(s):  
Massimiliano Drago ◽  
Meica Valdivia ◽  
Daniel Bragg ◽  
Enrique M. González ◽  
Alex Aguilar ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Habitat Use ◽  
Oxygen Isotopes ◽  
Marine Mammals ◽  
Rio De La Plata ◽  
Stable Oxygen Isotopes ◽  
Río De La Plata ◽  
La Plata ◽  
Stable Oxygen

scholarly journals Multilevel analysis of the bacterial diversity along the environmental gradient Río de la Plata–South Atlantic Ocean

2010 ◽  
Vol 61 (1) ◽  
pp. 57-72 ◽  
Author(s):  
C Alonso ◽  
P Gómez-Pereira ◽  
A Ramette ◽  
L Ortega ◽  
BM Fuchs ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Bacterial Diversity ◽  
Multilevel Analysis ◽  
Environmental Gradient ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata

scholarly journals Baseline data of the presence of meso and microplastics in digestive tract of a commercially important teleost fish from the Rio de la Plata Estuary System (Southwest Atlantic Ocean)

2021 ◽  
Vol 35 (1) ◽  
Author(s):  
María Agustina Mandiola ◽  
Ramiro Bagnato ◽  
Joaquín C. M. Gana ◽  
M. Carolina De León ◽  
Mariela Dassis ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Digestive Tract ◽  
Marine Debris ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
Southwest Atlantic ◽  
Commercial Fish ◽  
Plastic Debris ◽  
White Croaker ◽  
La Plata

In this paper, we analyze the occurrence, abundance, and type of plastic debris (PD) present on the digestive tracts of 65 white croakers (Micropogonias furnieri) catches from Rio de la Plata Estuary System (RLPES). Eighty percent of individuals analyzed had ingested PD, of which 156 were thread-like plastics (FO = 83.9 %) and 30 were fragments (FO = 16.1%). The average number of pieces per digestive tract was 2.83 ± 3.14. Microplastic represented 85% of PD, the majority of these pieces were <2 mm, and the preeminent color was blue. The RLPES is the area of the Southwest Atlantic Ocean that concentrates most of the records of plastic debris on the environment, where the white croaker is the main commercial fish. In addition, M. furnieri constitutes a key prey of several predators in the area. Although preliminary, this is a relevant contribution to the knowledge of marine debris pollution and its impact on the Southwest Atlantic Ocean organisms, particularly at the RLPES.

scholarly journals Remarks on the morphology and distribution of some rare centric diatoms in southern Brazilian continental shelf and slope waters

2012 ◽  
Vol 60 (4) ◽  
pp. 415-427 ◽  
Author(s):  
Marinês Garcia ◽  
Clarisse Odebrecht
Keyword(s):  
Atlantic Ocean ◽  
Continental Shelf ◽  
Southwestern Atlantic ◽  
Patos Lagoon ◽  
La Plata ◽  
Centric Diatoms ◽  
Southwestern Atlantic Ocean ◽  
The Family ◽  
Scanning Electron Microcopy ◽  
First Time

This paper provides information on the morphology and occurrence of extant diatoms of the family Asterolampraceae and Azpeitia species of the southernmost Brazilian continental shelf and slope waters in the Southwestern Atlantic Ocean (28 -34ºS), under the influence of Tropical, Subtropical, Subantarctic Waters, terrestrial discharges from La Plata River and Lagoa dos Patos lagoon. Plankton was sampled (20 µm net; vertical hauls) at the same 27 stations in winter 2005 and summer 2007. Among Asterolampraceae, Asteromphalus flabellatus was the most frequent species (57% of samples) observed mainly in winter samples (92%) in Subtropical Shelf Water but also under the influence of La Plata River plume (salinity <35). Lower frequencies were observed for Asterolampra marylandica, Asteromphalus elegans, Asteromphalus heptactis and Spatangidium arachne. Four species of Azpeitia were observed: A. barronii and A. neocrenulata for the first time in the South Atlantic Ocean while A. africana and A. nodulifer had already been registered in equatorial and southern areas of Brazil. All Azpeitia species were rare (19%) in offshore samples (100-200 m depth. Remarks on the morphology based on light and scanning electron microcopy observations are provided along with their distribution in the study area.

Isotope-based inferences of skipjack tuna feeding ecology and movement in the southwestern Atlantic Ocean

2021 ◽  
pp. 105246
Author(s):  
Juliano L. Coletto ◽  
Silvina Botta ◽  
Luciano G. Fischer ◽  
Seth D. Newsome ◽  
Lauro S.P. Madureira
Keyword(s):  
Atlantic Ocean ◽  
Feeding Ecology ◽  
Skipjack Tuna ◽  
Southwestern Atlantic ◽  
Southwestern Atlantic Ocean

scholarly journals Temporal and Spatial Variability Scales of Salinity at a Large Microtidal Estuary

2021 ◽  
Vol 9 (8) ◽  
pp. 860
Author(s):  
Michelle Jackson ◽  
Gianfranco Sienra ◽  
Pablo Santoro ◽  
Mónica Fossati
Keyword(s):  
Salt Transport ◽  
Spatiotemporal Variability ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
Salinity Field ◽  
Salinity Stratification ◽  
La Plata ◽  
Southwestern Atlantic Ocean ◽  
Large Width ◽  
Estuarine Hydrodynamics

The Río de la Plata is a large fluvial–estuarine–sea system discharging into the southwestern Atlantic Ocean, which has relevant features such as high fluvial discharge, microtidal astronomical tidal scales, a relevant meteorological tide, and a strong atmospheric forcing effect, due to its large width. The objective of this study is to advance the understanding of the estuarine hydrodynamics and salt transport, as well as discussing the main characteristics of the spatiotemporal variability of the salinity field. To achieve this, the results of a 3D model of the Río de la Plata and its maritime front were used, simulating an extensive period of 10 years. In this study, the model was validated using vertical salinity profiles collected at different locations in the estuary. The temporal variability of the salinity stratification was characterised at different temporal scales: annual, monthly, and storm. At the same time, the influences of fluvial flow and winds were determined. The correlation analysis between fluvial flow and the salinity field showed that high annual fluvial flows generate an extension of the freshwater area, with larger longitudinal salinity gradients and a shift of the salinity front towards the ocean. The tendency at the monthly scale is not as clear as that observed at the annual scale. The results show that the effect of a storm coming from the northwest is quite similar to that of storms coming from the southwest, especially in the central and southern zones of the Río de la Plata, where mixing increases and stratification decreases, according to the intensity of the storm. The effect of south–southeasterly storms increases the mixing process and reduces stratification; the opposite effect was identified with respect to northeasterly storms, under the influence of which the stratified area increases. Synthesising the obtained results, a global zonification of the vertical salinity stratification for the Río de la Plata is proposed.

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