An interesting new record of the almost unknown brachypterous phaneropterine katydid Xenicola dohrni (Orthoptera: Tettigoniidae) from Argentina, and its high-ultrasound male-female communication

Zootaxa ◽  
2021 ◽  
Vol 4948 (2) ◽  
pp. 287-294
Author(s):  
HOLGER BRAUN
Keyword(s):  
Acoustic Communication ◽  
Carrier Frequency ◽  
New Record ◽  
Rio De La Plata ◽  
Southern Brazil ◽  
Frequency Range ◽  
Río De La Plata ◽  
La Plata ◽  
Floating Vegetation

The southernmost record of the neotropical genus Xenicola is documented. An apparently tiny population of X. dohrni, a species described long ago from southern Brazil without other published records, lives at the shore of the Río de la Plata, 1000 km further south. Perhaps it has been established there by means of floating vegetation. The acoustic communication of this species is also very interesting: The male produces with its minuscule tegmina brief signals with a carrier frequency range between 80 and 100 kHz. The female responds, and the male modifies its song when engaged in a duet. It modifies it further, when the female responds from very close. The paper includes a review of the records of Xenicola species on biodiversity observation platforms. 

scholarly journals Actinopterygii, Characiformes, Characidae: Ectrepopterus uruguayensis (Fowler, 1943): new record for Argentina

Check List ◽  
2013 ◽  
Vol 9 (5) ◽  
pp. 1043
Author(s):  
Amalia M. Miquelarena ◽  
Fernando R. Carvalho
Keyword(s):  
New Record ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Entre Rios

Ectrepopterus uruguayensis Fowler was recently redescribed, with occurrence in lower tributaries of Río de la Plata and lower Río Uruguay, Uruguay. Herein its occurrence is extended and confirmed to Argentina, arroyo El Molino, in Uruguay Department, Entre Ríos Province, Uruguay drainage.

scholarly journals Tectonic evolution of the Dom Feliciano Belt in Southern Brazil: Geological relationships and U-Pb geochronology

2016 ◽  
Vol 46 (suppl 1) ◽  
pp. 83-104 ◽  
Author(s):  
Ruy Paulo Philipp ◽  
Marcio Martins Pimentel ◽  
Farid Chemale Jr
Keyword(s):  
Active Continental Margin ◽  
Structural Data ◽  
Shear Zones ◽  
Crustal Thickening ◽  
Geochemical Data ◽  
Rio De La Plata ◽  
Southern Brazil ◽  
Río De La Plata ◽  
La Plata ◽  
Dom Feliciano Belt

ABSTRACT: The Dom Feliciano Belt is an important Neoproterozoic to Cambrian orogenic complex, extending from eastern Uruguay to southern Brazil. It comprises a collage of oceanic domains and continental fragments developed between 900 and 540 Ma between the Rio de La Plata, Congo and Kalahari cratons. The integration of field and structural data with recent isotopic results has introduced new insights on the sources of the magmatism and sedimentary processes. This paper presents a review of the geochronological results combined with stratigraphic, structural and geochemical data. The evolution of the Dom Feliciano Belt involved three orogenic events known as the Passinho (0.89 - 0.86 Ga), São Gabriel (0.77 - 0.68 Ga) and Dom Feliciano (0.65 - 0.54 Ga). The first two events involved the closure of the Charrua Ocean generating an intra-oceanic arc (Passinho) and, subsequently, an active continental margin arc (São Gabriel). This ocean separated the continental areas represented by the Rio de la Plata Craton and the Nico Perez continental microplate. Closure of the Adamastor ocean resulted in an important collisional event between the Nico Perez Microplate/Rio de La Plata Craton and Kalahari and Congo cratons between 650 and 620 Ma, involving high T/intermediate P metamorphism. At this time of crustal thickening, the partition of the deformation controled the final evolution of the belt with important escape tectonics, responsible for nucleating crustal-scale transcurrent shear zones. These structures were deep and promoted the rise of mafic magmas, which, associated with high regional thermal gradient, lead to an important event of crustal reworking, responsible for the formation of the Pelotas Batholith. The orogenic collapse is represented by late magmatism of Pelotas Batholith and deposition of upper section of the Camaquã Basin.

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 Detecting and Quantifying a Massive Invasion of Floating Aquatic Plants in the Río de la Plata Turbid Waters Using High Spatial Resolution Ocean Color Imagery

2018 ◽  
Vol 10 (7) ◽  
pp. 1140 ◽  
Author(s):  
Ana Dogliotti ◽  
Juan Gossn ◽  
Quinten Vanhellemont ◽  
Kevin Ruddick
Keyword(s):  
High Resolution ◽  
Aquatic Plants ◽  
Color Space ◽  
Landsat 8 ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Turbid Waters ◽  
High Resolution Imagery ◽  
Floating Vegetation

The massive development of floating plants in floodplain lakes and wetlands in the upper Middle Paraná river in the La Plata basin is environmentally and socioeconomically important. Every year aquatic plant detachments drift downstream arriving in small amounts to the Río de la Plata, but huge temporary invasions have been observed every 10 or 15 years associated to massive floods. From late December 2015, heavy rains driven by a strong El Niño increased river levels, provoking a large temporary invasion of aquatic plants from January to May 2016. This event caused significant disruption of human activities via clogging of drinking water intakes in the estuary, blocking of ports and marinas and introducing dangerous animals from faraway wetlands into the city. In this study, we developed a scheme to map floating vegetation in turbid waters using high-resolution imagery, like Sentinel-2/SMI (MultiSpectral Imager), Landsat-8/OLI (Operational Land Imager), and Aqua/MODIS (MODerate resolution Imager Spectroradiometer)-250 m. A combination of the Floating Algal Index (that make use of the strong signal in the NIR part of the spectrum), plus conditions set on the RED band (to avoid misclassifying highly turbid waters) and on the CIE La*b* color space coordinates (to confirm the visually “green” pixels as floating vegetation) were used. A time-series of multisensor high resolution imagery was analyzed to study the temporal variability, covered area and distribution of the unusual floating macroalgae invasion that started in January 2016 in the Río de la Plata estuary.

scholarly journals Vascular plant species of the floating vegetation rafts from the Río de la Plata (Argentina)

Rodriguésia ◽  
2018 ◽  
Vol 69 (4) ◽  
pp. 1965-1972
Author(s):  
Elián Leandro Guerrero ◽  
Federico Lisandro Agnolin ◽  
Mariana Benedictto ◽  
Diego Gambeta ◽  
Felipe Andrés Suazo Lara ◽  
...  
Keyword(s):  
Plant Species ◽  
Vascular Plant ◽  
Sensu Stricto ◽  
Point Of View ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
Economic Point ◽  
La Plata ◽  
Floating Vegetation ◽  
Conservation Plans

Abstract In South American rivers, Eichhornia crassipes and other floating plants intertwine and form floating rafts commonly known as "camalotales" which are especially abundant during flooding periods. During extraordinary floods, hectares of floating mats are drifted by the Plata Basin Rivers. In the Río de la Plata several reports suggest that many animal and plant species from subtropical latitudes colonizes the area through these large rafts. These episodes are very important from the economic point of view because they cause several troubles to navigation and other activities. On the other hand, benefits to biodiversity are conspicuous, and many authors consider this process vital to the Río de la Plata wetlands and forests. However, there is scarce knowledge about Eichhornia rafts plant species composition. With the aim of creating an exhaustive list of the flora of the Eichhornia rafts, we visited the Río de la Plata coast during a massive Eichhornia rafts arrival. Thirty-two plant species were recorded in three different plant assemblages: Eichhornia rafts sensu stricto, floating reeds (canutillares) and embalsados. In front of this unexpected we emphasize the need to include this phenomenon in regional biodiversity conservation plans.

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