scholarly journals Checklist of aquatic and marshy Monocotyledons from the Araguaia River basin, Brazilian Cerrado

2016 ◽  
Vol 4 ◽  
pp. e7085
Author(s):  
Adriana Oliveira ◽  
Claudia Bove
Keyword(s):  
River Basin ◽  
Brazilian Cerrado ◽  
Araguaia River

scholarly journals Hydrophytic Cyperaceae from the Araguaia river basin, Brazil

Rodriguésia ◽  
2011 ◽  
Vol 62 (4) ◽  
pp. 847-866 ◽  
Author(s):  
Adriana Luiza Ribeiro de Oliveira ◽  
André dos Santos Bragança Gil ◽  
Claudia Petean Bove
Keyword(s):  
River Basin ◽  
Geographic Distribution ◽  
Brazilian Cerrado ◽  
Identification Keys ◽  
Araguaia River ◽  
Cerrado Savanna

Abstract Cyperaceae is a cosmopolitan family with over 5,000 species, which are often found in wet habitats. In this study we found 31 hydrophylic species of Cyperaceae, belonging to 10 genera (Ascolepis, Calyptrocarya, Cyperus, Eleocharis, Fimbristylis, Fuirena, Lipocarpha, Pycreus, Rhynchospora and Scleria), that occur in the Araguaia River Basin, located mainly within the Brazilian Cerrado (savanna). Short descriptions, geographic distribution, illustrations, identification keys and comments are presented.

Long known, brand new, and possibly threatened: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins-Araguaia River Basin, Brazil

Zootaxa ◽  
2021 ◽  
Vol 4903 (2) ◽  
pp. 217-241
Author(s):  
ANTONIO MORAES-DA-SILVA ◽  
RENATA CECÍLIA AMARO ◽  
PEDRO M. SALES NUNES ◽  
MIGUEL TREFAUT RODRIGUES ◽  
FELIPE FRANCO CURCIO
Keyword(s):  
New Species ◽  
River Basin ◽  
Sister Group ◽  
Color Pattern ◽  
Rapid Expansion ◽  
Brazilian Cerrado ◽  
Superficial Resemblance ◽  
Araguaia River ◽  
Molecular Phylogenetic ◽  
A New Species

We describe a new species of watersnake of the genus Helicops from the Tocantins-Araguaia River Basin based on characters of coloration and hemipenial morphology, also corroborated by a molecular phylogenetic analysis including 18 terminals of 10 additional congeners. The new species superficially resembles the spotted-patterned He. leopardinus, but differs from it in exhibiting dorsal spots fused into irregular bands, and a unique hemipenial structure with two pairs of distinctly enlarged basal spines. In addition, despite the superficial resemblance of color pattern, our genetic evidence indicates that the new species does not belong to the He. leopardinus radiation, representing the sister group of a component including terminals of this species, He. modestus, and He. infrataeniatus. Finally, we discuss the apparent restriction of the new species to the Tocantins-Araguaia Basin with focus on vicariant processes that may have promoted its differentiation, as well as on the conservation challenges in an area severely affected by anthropic impacts associated with the rapid expansion of hydroelectric and agricultural sectors in the Brazilian Cerrado. 

scholarly journals The Tocantins-Araguaia Basin as a migratory route and a wintering area of Falco peregrinus (Aves, Falconidae)

2019 ◽  
Vol 27 (4) ◽  
pp. 284-290
Author(s):  
Túlio Dornas ◽  
Willian Menq ◽  
Tiago Junqueira ◽  
Estevão F. Santos
Keyword(s):  
South America ◽  
River Basin ◽  
The State ◽  
Migration Route ◽  
Falco Peregrinus ◽  
Central Brazil ◽  
Araguaia River ◽  
Wintering Area ◽  
Migratory Route

AbstractThe Peregrine Falco peregrinus, is an Nearctic migrant to Brazil where its status in central Brazil is still poorly known. Herein we present a compilation of records of the species from the state of Tocantins and comment on its use of a wintering site in the state of Goiás. These records show that the Tocantins-Araguaia River Basin is a migration route for the species, and therefore a mid-continental migration route through the interior of South America.

scholarly journals Effects of area and available energy on fish assemblages of tropical streams

2017 ◽  
Vol 68 (4) ◽  
pp. 772 ◽  
Author(s):  
Bruno Bastos Gonçalves ◽  
Francisco Leonardo Tejerina-Garro ◽  
Rodrigo Assis de Carvalho
Keyword(s):  
River Basin ◽  
Fish Assemblages ◽  
Regional Scale ◽  
Drainage Area ◽  
Taxonomic Richness ◽  
Local Conditions ◽  
Available Energy ◽  
Functional Richness ◽  
Araguaia River ◽  
Species Area

A central issue in fish community ecology is to understand how the size of the drainage area and the available energy influence fish species diversity and their spatial distribution. In the present study, we tested whether the species–area relationship (represented by drainage area) and species–energy association (represented by algal biomass and organic matter) drive taxonomic and functional richness in a regional scale. The results indicated that fish assemblages of the two tropical neighbouring basins sampled responded differently to the size of drainage area. Whereas taxonomic richness was influenced by the size of the drainage area in Tocantins River basin streams, it was not affected in Araguaia River basin streams. Both taxonomic richness and functional richness of the fish assemblages were affected by available energy in the system. A possible explanation for these different responses is related to local conditions, such as the percentage of natural vegetation cover encountered in each basin.

scholarly journals The genus Pinnularia (Bacillariophyta, Pinnulariaceae) from Lago dos Tigres, Britânia, Goiás, Brazil

2016 ◽  
Vol 16 (1) ◽  
Author(s):  
Weliton José da Silva ◽  
Daiane Ruwer ◽  
Ina Nogueira ◽  
Bárbara Dunck
Keyword(s):  
River Basin ◽  
First Record ◽  
The State ◽  
Aquatic Systems ◽  
Amazon River ◽  
Taxonomic Study ◽  
Amazon River Basin ◽  
Parana River ◽  
Araguaia River ◽  
Infraspecific Taxa

Studies of the genus Pinnularia Ehrenb. are only incipient in central-western Brazil, especially in Goiás. Only 20 of the 170 taxa known from Brazil were recorded in this state until now. A taxonomic study of Pinnularia from Lago dos Tigres (Tocantins-Araguaia River Basin) recorded 20 specific and infraspecific taxa, distributed in 17 species, including P. instabilis whose lectotype is designated here. Only P. meridiana var. meridiana was previously recorded in aquatic systems of the state. Eighteen taxa are newly recorded for Goiás, and one is the first record in Brazil. The Pinnularia flora from Lago dos Tigres contains nine taxa in common with the Amazon River Basin flora, and seven other taxa that occur elsewhere in the Paraná River Basin.

scholarly journals Regionalization of reference streamflows for the Araguaia River basin in Brazil

2020 ◽  
Vol 41 (3) ◽  
pp. 829 ◽  
Author(s):  
Marco Antonio Vieira Morais ◽  
Marcelo Ribeiro Viola ◽  
Carlos Rogério de Mello ◽  
Jéssica Assaid Martins Rodrigues ◽  
Vinícius Augusto de Oliveira
Keyword(s):  
River Basin ◽  
Cross Validation ◽  
Monitoring Network ◽  
Linear Potential ◽  
Explanatory Variables ◽  
Hydrological Data ◽  
Robust Model ◽  
Araguaia River ◽  
Agricultural Use ◽  
Leave One Out

Hydraulic projects and water management require reliable hydrological data. The Araguaia-Tocantins River basin, in addition to agricultural use, has great potential for hydroelectric exploitation. However, the streamflow monitoring network in the Araguaia River basin is composed of only a few stations, resulting in a lack of hydrological data. The regionalization of the reference streamflows is a technique that can help circumvent this lack of data, enabling the estimation of streamflows from easily obtainable explanatory variables. In this context, the objective of this study was to develop regional functions for the maximum streamflow (Qmax) applicable to different Return Periods (RP), the long-term mean streamflow (Qmlt) and the 95% streamflow permanence (Q95) of the upper and middle Araguaia River sub-basins. The dimensionless streamflow methodology was adopted with the drainage area as an explanatory variable. The tested regressive models were the linear, potential and quotient models. Leave-one-out cross-validation was used to assess the quality of the regional models. Ten statistical distributions of 2 to 5 parameters were used. (i) Satisfactory results were obtained for all reference streamflows. (ii) The cross-validation technique proved to be essential for the selection of the most robust model. (iii) The quotient model was shown to be superior to the potential linear model in most cases.

scholarly journals Cost of charging for water use in the Brazilian Cerrado hydrographic basin

2018 ◽  
Vol 13 (5) ◽  
pp. 1
Author(s):  
Kalesson Martins Alencar ◽  
Michel Castro Moreira ◽  
Demetrius David da Silva
Keyword(s):  
River Basin ◽  
Water Use ◽  
Production Costs ◽  
Irrigated Agriculture ◽  
Relative Cost ◽  
Brazilian Cerrado ◽  
Water Users ◽  
Bodies Of Water ◽  
Doce River

This study analyzed the relative cost of charging for water use with respect to water users' production costs in the Grande River Basin, located in the Brazilian Cerrado, considering the principal charging methods existing in Brazil. The study was developed based on: the rights of use grant data surveys pertaining to water resources and the classification of bodies of water into usage classes; a simulation of charging for water use through various methods; and an analysis of the relative cost of charges on the production cost of the water users. The charging methods used by the following were studied: the Committee of the Basin of River Paraíba do Sul (CEIVAP), the Committee of Basins of Piracicaba, Capivari and Jundiaí Rivers (PCJ), the São Francisco River Basin Committee (CBHSF) and the Doce River Basin Committee (CBH-DOCE). The study verified that irrigated agriculture is the sector that uses the most water, representing 46.4% of the outflow granted in the basin. Considering the different charging methods, the collection in the basin of the Grande River potentially allows for investments of US$ 1.2 million (PCJ), US$ 920,000 (CEIVAP), US$ 426,000 (CBH-DOCE), or US$ 297,000 (CBHSF) in this region, leading to average relative costs of 0.68% (irrigation), 0.28% (human) and 0.08% (industry). For this reason, there is the possibility of implanting charges for water use in the Grande River Basin, with either the CEIVAP's or PCJ's method appearing to be the most suitable, given that the parameters of these mechanisms are in line with existing activities in the basin.

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