Climatic events during the Late Pleistocene and Holocene in the Upper Parana River: Correlation with NE Argentina and South-Central Brazil

2000 ◽  
Vol 72 (1) ◽  
pp. 73-85 ◽  
Author(s):  
José C. Stevaux
Keyword(s):  
Late Pleistocene ◽  
Paraná River ◽  
Central Brazil ◽  
Parana River ◽  
South Central ◽  
Upper Paraná River

scholarly journals Quaternary colluvial episodes (Upper Paraná River Hydrographic Basin, Brazil)

2010 ◽  
Vol 82 (3) ◽  
pp. 701-715 ◽  
Author(s):  
Alethea E.M. Sallun ◽  
Kenitiro Suguio
Keyword(s):  
Oxygen Isotope ◽  
Soil Cover ◽  
Climatic Changes ◽  
Paraná River ◽  
Sediment Deposition ◽  
Hydrographic Basin ◽  
Neotectonic Activity ◽  
Central Brazil ◽  
Parana River ◽  
Upper Paraná River

Colluvial deposits occur extensively in the Upper Paraná River Hydrographic Basin (UPRHB) in Southeastern,Southern, and Western central Brazil. These deposits were recognized as an allostratigraphic unit and related to creeping during the Quaternary. Every studied colluvial profile is homogeneous, which indicates relatively long periods of landscape stability that is sufficient for the development of a thick soil cover. The deposits were dated by luminescence and indicate periods of more intense colluvial deposition between 6 and 220 ky B.P. These events correspond approximately to the transitions between the oxygen isotope stages 2-3-4 and 5-6, suggesting that this aggradation was influenced by climatic changes. However, the most important alluviation episode was tentatively correlated with the Middle to Upper Pleniglacial of the Wisconsin glaciation. The most intensive and frequent periods of precipitation that occurred during climate transitions are probably correlated with aggradation events. The regularity of the colluvial deposits suggests continuous uplift accompanied by sediment deposition throughout the UPRHB due to neotectonic activity during the last million years.

scholarly journals Late Pleistocene and Holocene paleoenvironments in ponds and alluvial sediments of Upper Paraná River, Brazil

2013 ◽  
Vol 16 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Renato Lada Guerreiro ◽  
José Cândido Stevaux ◽  
Mauro Parolin ◽  
Mario Luis Assine
Keyword(s):  
Late Pleistocene ◽  
Paraná River ◽  
Alluvial Sediments ◽  
Parana River ◽  
Upper Paraná River

scholarly journals Assessment of fish assemblages in streams of different orders in the Upper Paraná River basin, Central Brazil

2014 ◽  
Vol 104 (2) ◽  
pp. 175-183 ◽  
Author(s):  
Thiago B. Vieira ◽  
Francisco L. Tejerina-Garro
Keyword(s):  
River Basin ◽  
Fish Assemblages ◽  
Trophic Group ◽  
Paraná River ◽  
Central Brazil ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Santa Maria ◽  
Paraná River Basin

The aim of this study was to test whether the richness observed and the biomass per trophic group of fish assemblages vary depending on the order (1st and 2nd) of the streams located in three different basins of the Upper Paraná River Basin, Central Brazil. Samples were collected between April and September, 2009, in 27 streams of the Meia Ponte, Piracanjuba and Santa Maria River basins. A total of 4,879 specimens were collected distributed in 59 species and 19 families. The statistical analyses carried out indicate that the observed richness and biomass of omnivore fish were influenced by the interaction of two factors: stream order and basin. The 2nd order streams located in the Santa Maria basin presented significant differences in the observed richness and omnivore biomass when compared to i) 1st order streams in the same basin (only richness) or in the Piracanjuba and Meia Ponte basin; ii) 2nd order streams in the Piracanjuba (only omnivore biomass) and Meia Ponte Rivers basins. Results are discussed considering the influence of geomorphic processes on fish assemblages and food availability.

scholarly journals Evaluation of the Upper Paraná River discharge controlled by reservoirs

2009 ◽  
Vol 69 (2 suppl) ◽  
pp. 707-716 ◽  
Author(s):  
EE. Souza Filho
Keyword(s):  
Paraná River ◽  
River Level ◽  
Parana River ◽  
River Damming ◽  
Discharge Rates ◽  
Historical Series ◽  
Discharge Regime ◽  
Upper Paraná River ◽  
The Relationship ◽  
Different Levels

The building of large dams in the Upper Paraná River basin altered the discharge regime at the Porto São José River section. The discharge regime has been altered since 1972, but the changes intensified after the Porto Primavera damming, in late 1998. Considering that discharge control affects the relationship between channel and floodplain, this work aimed to evaluate the intensity of the discharge control that resulted from the operation of the Porto Primavera Dam. To achieve this objective, statistical analyses were carried out based on the Porto São José Fluviometric Station historical series of river level readings and discharge, between 1964 and 2007. Results showed that the average discharge increased from 1964 to 1981 and diminished after river damming. The increase of average discharge rates was followed by an increase of the duration of higher discharges at different levels of geomorphologic and limnological importance, and the reduction of average discharge during the last observed period was followed by a disproportionate decrease in the duration of the abovementioned discharges. Moreover, it is clear that the relationship between fluviometric level and fluvial discharge changed, which implies that a certain river level reading represents a higher discharge than necessary before river damming.

scholarly journals Genetic variability of brycon orbignyanus (valenciennes, 1850) (characiformes: characidae) in cultivated and natural populations of the upper paraná river, and implications for the conservation of the species

2011 ◽  
Vol 54 (4) ◽  
pp. 839-848 ◽  
Author(s):  
Renata de Souza Panarari-Antunes ◽  
Alberto José Prioli ◽  
Sônia Maria Alves Pinto Prioli ◽  
Alexsandro Sobreira Galdino ◽  
Horácio Ferreira Julio Junior ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Natural Populations ◽  
Paraná River ◽  
Parana River ◽  
Upper Paraná River

scholarly journals Comparison of the diet of Alouatta caraya (Primates: Atelidae) between a riparian island and mainland on the Upper Parana River, southern Brazil

2008 ◽  
Vol 25 (3) ◽  
pp. 419-426 ◽  
Author(s):  
Gabriela Ludwig ◽  
Lucas M. Aguiar ◽  
Walfrido K. Svoboda ◽  
Carmen L. S. Hilst ◽  
Italmar T. Navarro ◽  
...  
Keyword(s):  
Sampling Method ◽  
Riparian Forest ◽  
Diet Breadth ◽  
Paraná River ◽  
Food Type ◽  
Left Bank ◽  
Southern Brazil ◽  
Alouatta Caraya ◽  
Parana River ◽  
Upper Paraná River

Howler monkeys (Alouatta Lacèpéde, 1799) are folivores-frugivores with flexible diets depending on conditions. Here, we compare the diets of Alouatta caraya (Humboldt, 1812) in two riparian forests (island and mainland), in Porto Rico region, Upper Paraná River, Southern Brazil. Howlers were followed from October 2004 to September 2005 in the riparian forest of a 1,050 ha island and in the continuous riparian forest on the mainland (left bank of the river). The "scan sampling" method with instantaneous samples every 15 minutes was used. Besides vines, diet breadth was similar: 17 species consumed on the island versus 16 species on the mainland. Both consumed leaves followed by fruits more than any other food type (leaves: island - 65%, mainland - 49%, fruits: island - 24%, mainland - 46%). Even though the plant Cecropia pachystachya Trécul is less abundant in the mainland it was the item most consumed in both locations all year long, which suggests its importance for the howlers. Diet also varied both seasonally and between the island and mainland, apparently following changes in local abundance of each item and due to plant phenologies.

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