Range extension for three species of South American freshwater crabs (Crustacea: Decapoda: Trichodactylidae)

Zootaxa ◽  
2009 ◽  
Vol 1977 (1) ◽  
pp. 49-54 ◽  
Author(s):  
PABLO A. COLLINS ◽  
FEDERICO GIRI ◽  
VERÓNICA WILLINER
Keyword(s):  
Amazon Basin ◽  
New Records ◽  
Paraná River ◽  
South American ◽  
Crab Species ◽  
Southern South America ◽  
Parana River ◽  
The North ◽  
Freshwater Crabs ◽  
Middle Paraná

New sampling programs have extended the distribution of three species of freshwater crabs (family Trichodactylidae): Dilocarcinus septemdentatus and Sylviocarcinus pictus from the Amazon basin to southern South America, and S. australis, from the north of Argentina southwards. The three species are now found in the floodplain of the middle Paraná River (31°39'S, 60°45'W). The extension of their distribution is approximately 500 km and 2000 km further south. The number of freshwater crab species in the alluvial valley of the Paraná River has increased by 30% with these new records.

NDVI patterns as indicator of morphodynamic activity in the middle Paraná River floodplain

Geomorphology ◽  
2016 ◽  
Vol 253 ◽  
pp. 146-158 ◽  
Author(s):  
Z.Y. Marchetti ◽  
P.G. Minotti ◽  
C.G. Ramonell ◽  
F. Schivo ◽  
P. Kandus
Keyword(s):  
Paraná River ◽  
River Floodplain ◽  
Parana River ◽  
Paraná River Floodplain ◽  
Middle Paraná

South American Missions

2021 ◽  
Author(s):  
Cameron Jones
Keyword(s):  
South America ◽  
Amazon Basin ◽  
Colonial Period ◽  
Indigenous Populations ◽  
South American ◽  
Extensive Experience ◽  
Republican Period ◽  
The North ◽  
Bourbon Reforms ◽  
Franciscan Order

While it is certainly true that more academic studies have focused on the North American missions, in terms of their historical impact South American missions were just as important to the frontiers of Spain and Portugal’s American empires. The massive size alone of the frontier region, stretching from the upper reaches of the Amazon basin to the headwaters of the Paraná as well as stretching across the lower Southern Cone, meant numerous missionary enterprises emerged in an attempt to evangelize the peoples who inhabited these regions. While small handfuls of Dominicans, Mercedarians, and Augustinians would engage in such efforts, most missions were established by the Jesuits or Franciscans. Certainly, for the Jesuits, or the Society of Jesus as they are properly known, American missions represented an extension of the Counter-Reformation for which they were created. Starting in the mid-16th century, this relatively new organization, founded in 1534, began in earnest to “reduce” the Indigenous peoples into their missions. These activities, however, abruptly ended when the Jesuits were expelled from both the Portuguese and Spanish empires in 1759 and 1767 respectfully. The much older Franciscan order had extensive experience in popular missions in Europe and was one of the first orders of regular clergy in the Americas. Franciscans, like the Jesuits, engaged in evangelizing activities throughout both North and South America from the colonial period to the present. The expulsion of the Jesuits, however, pushed them further to the forefront of missionizing efforts in the late colonial period. This acceleration of Franciscan missionary activity was aided by the establishment of the Apostolic Institute in 1682. The Institute created a pipeline of missionaries from Spain to come directly to frontier areas with funding from the crown. While this aided missionary efforts throughout South America, particularly in areas abandoned by the Jesuits, it embroiled the missionaries in the politics of the Bourbon reforms and their obsession with limited clerical power. Ultimately, while missionizing efforts continued into the Republican period, their association with the Spanish and Portuguese crowns led to widespread suppression and secularization following independence. The historiographical divide in the field tends to lie between usually older, Eurocentric histories by scholar-clerics which focus on the missionaries themselves, and newer studies carried out by more secular professional historians that examine how Indigenous populations were affected by the inherent imperialism of the missions, though exceptions abound.

scholarly journals Hydropower Development and Fishways: A Need for Connectivity in Rivers of the Upper Paraná Basin

2019 ◽  
Vol 11 (13) ◽  
pp. 3749 ◽  
Author(s):  
Sergio Makrakis ◽  
Ana P. S. Bertão ◽  
Jhony F. M. Silva ◽  
Maristela C. Makrakis ◽  
Fco. Javier Sanz-Ronda ◽  
...  
Keyword(s):  
Scientific Literature ◽  
Structural Connectivity ◽  
Paraná River ◽  
South American ◽  
Hydroelectric Dams ◽  
Migratory Fish ◽  
Parana River ◽  
Hydropower Plants ◽  
Hydropower Dams ◽  
Upper Paraná River

South American rivers have become intensely affected by the construction of hydroelectric dams that block the river’s connectivity for migratory fish species. In order to mitigate the problems caused by dams and to reestablish connections between habitats, fishways are implemented. Fishways are structures that aid fish in overcoming obstacles and help preserve migratory, reproductive, and feeding routes. This study performed an inventory of all hydropower plants—present and future—in the Upper Paraná River, with the objective of identifying fishways unknown to scientific literature, as well as the task of mapping them. By doing so, the current situation of structural connectivity via fishways in the Upper Paraná River Basin was described. Overall, 389 dams along 209 rivers were identified; of these, only 9% (35 dams) have fishways. In addition, an alarming explosion of future medium-sized hydropower plants was observed, with an expectation of an almost 500% increase in relation to those existing. This data reveals a trend of reduction of free-flowing river stretches, which are crucial habitats for Neotropical potamodromous species, and point to a deficiency in the structural connectivity of existing hydropower dams. Furthermore, if the implementations of these expected constructions are associated with limited connectivity as a result of the absence of fishways, the management of fisheries and their resources in the Upper Paraná River may become unsustainable.

scholarly journals Novel Diversity of Deeply Branching Holomycota and Unicellular Holozoans Revealed by Metabarcoding in Middle Paraná River, Argentina

2018 ◽  
Vol 6 ◽  
Author(s):  
Alicia S. Arroyo ◽  
David López-Escardó ◽  
Eunsoo Kim ◽  
Iñaki Ruiz-Trillo ◽  
Sebastián R. Najle
Keyword(s):  
Paraná River ◽  
Parana River ◽  
Middle Paraná

scholarly journals Pigmented Euglenophyceae of a lentic environment at the Upper Paraná River Floodplain, Brazil

2018 ◽  
Vol 30 (0) ◽  
Author(s):  
Susicley Jati ◽  
Carla Cristiane de Jesus Borsalli ◽  
Sueli Train
Keyword(s):  
Geographical Distribution ◽  
New Records ◽  
Environmental Variability ◽  
Paraná River ◽  
Biodiversity Survey ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain

Abstract Aim Contributing to taxonomic knowledge on Pigmented Euglenophyceae at the Upper Paraná River Floodplain by enlarging the biodiversity survey in this ecosystem, in addition to contributing to the knowledge on the geographical distribution of this group in Brazil. Methods Quarterly samplings in the limnetic region of a floodplain lake between February 2000 and March 2009, numbering 30 samples obtained from both vertical and horizontal trawls using plankton net of a 15 µm-mesh aperture and subjected to Transeau-solution preservation. We prepared temporary slides and analyzed in order to have the organisms identified, measured and photographed through digital camera, directly using an Olympus binocular optical microscope with a 400x/1000x magnification. The analysis included the calculation of Constancy (C) for the sample of each species. Results 36 taxa were identified. Genus Trachelomonas Ehr. emend. Defl. had the best representation, with 20 taxa. Among the taxa surveyed, 53% (19 taxa) constituted new records of occurrence for the Upper Paraná River Floodplain. The taxa recorded as frequent (33.3%) are considered cosmopolitan and present wide geographical distribution throughout Brazil; however, most of the taxa surveyed (67%) was classified as sporadic or rare, which is probably related to the high environmental variability observed along the study period. Conclusion Among the surveyed 19 taxa constituted new records of occurrence for the upper Paraná River floodplain and extended the geographical distribution of Euglenophyceae in Brazil.

scholarly journals Decomposition of cattle manure and colonization by macroinvertebrates in sediment of a wetland of the Middle Paraná River

2016 ◽  
Vol 16 (9) ◽  
pp. 2316-2325 ◽  
Author(s):  
Leticia M. Mesa ◽  
Cecilia Maldini ◽  
Gisela Mayora ◽  
Miguel Saigo ◽  
Mercedes Marchese ◽  
...  
Keyword(s):  
Paraná River ◽  
Cattle Manure ◽  
Parana River ◽  
Middle Paraná
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