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.

Vascular plant species richness and distribution in the Río de la Plata grasslands

2018 ◽  
Author(s):  
Bianca Ott Andrade ◽  
Eduardo Marchesi ◽  
Silvia Burkart ◽  
Robberson Bernal Setubal ◽  
Felipe Lezama ◽  
...  
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Vascular Plant ◽  
Plant Species Richness ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Vascular Plant Species

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 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 Floristic composition of Isla de las Gaviotas, Río de la Plata estuary, Uruguay

Check List ◽  
2013 ◽  
Vol 9 (4) ◽  
pp. 763 ◽  
Author(s):  
Anaclara Guido ◽  
Patricia Mai ◽  
Verónica Piñeiro ◽  
Dominique Mourelle ◽  
Mercedes Souza ◽  
...  
Keyword(s):  
Plant Species ◽  
Native Species ◽  
Floristic Composition ◽  
Sampling Technique ◽  
Distribution Patterns ◽  
Coastal Vegetation ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
Species List ◽  
La Plata

Isla de las Gaviotas is an island located in Río de la Plata estuary, Uruguay. The aim of this study is to determine and analyze plant species composition on this island and to identify vegetation zonation patterns. An angiosperm species list was generated using a qualitative sampling technique. We registered a total of 27 species, distributed among 18 families. According to species distribution patterns on the island, we propose four vegetation zones: North, Central, Southeast and West. Exotic species comprised 52% of the total number of species, reflecting a history of disturbance in the area. Nonetheless, this site also has a remarkable number of native species, in particular Heliotropium curassavicum, which is listed among Uruguayan species of conservation concern. Given that the loss of coastal plant species is a current problem, the proportion of native halophyte species recorded (37%) indicated the island’s importance as a relict of Uruguayan coastal vegetation.

scholarly journals Vegetación de un área polderizada del Río de la Plata en la Ciudad de Buenos Aires: la Reserva Ecológica Ciudad Universitaria - Costanera Norte

2020 ◽  
Vol 8 (2) ◽  
pp. 460-478
Author(s):  
Rocío Melzi Fiorenza ◽  
Horacio Sirolli ◽  
Pablo I. Picca
Keyword(s):  
Plant Communities ◽  
Buenos Aires ◽  
Vascular Plant ◽  
Life Forms ◽  
Systematic Sampling ◽  
Rio De La Plata ◽  
Species Trees ◽  
Río De La Plata ◽  
Entire Area ◽  
La Plata

Coastal reclamation constitutes a world trend and can result in new ecosystems adapted to the new coastal configuration. In Buenos Aires City, the “Ciudad Universitaria - Costanera Norte” Ecological Reserve (RECU-CN) constitutes one example of the expansion of the coastline in the Río de la Plata sector, carried out in the late 1960s. Given the lack of published works generated systematically that cover the entire area, we set as the objective to describe the RECU-CN vascular plant vegetation. For this, a systematic sampling was carried out in 79 plots of 25 m2, where the coverage of each of the vascular plant species present was registered. We identified 154 taxa, corresponding to 144 species, 123 genus and 58 families, and the total richness was estimated as 238 species. Trees and herbs had the highest coverage of all life forms. Through multivariate analysis, three vegetation units (Wetland, Forest and Grassland with groves) and 10 vascular plant communities were recognized. Vegetation was ordered according to two gradients: one of flood and another of anthropization. From the comparison with the typical plant communities of the region, similarities were found only with those registered in the Wetland unit. Results highlight that both the coexistence of physiognomically diverse vegetation units, as well as the native composition found in the plant communities of the Wetland unit, constitute main conservation values of the protected area.

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