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Journal articles on the topic 'Tocanins River'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Yamada, Fabio, and Ricardo Takemoto. "Metazoan parasite fauna of two peacock-bass cichlid fish in Brazil." Check List 9, no. (6) (2013): 1371–77. https://doi.org/10.15560/9.6.1371.

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A parasitological study of two freshwater cichlid fish of the genus <em>Cichla </em>(<em>C. kelberi </em>and <em>C. piquiti</em>) from six different aquatic ecosystems in Brazil was performed. Based on the survey, a checklist of the component community of the metazoan parasites of each of the two peacock-bass fish species was produced. Fish were collected from May 2009 to April 2011 in six Brazilian aquatic ecosystems using gillnets of different mesh sizes or angling using standardized effort. In total, six groups of parasites were collected: Monogenea, Digenea, Cestoda, Nematoda, Copepoda and

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Dagosta, Fernando C. P., Murilo N. L. Pastana, and André L. H. Esguícero. "New records of fishes (Actinopterygii: Ostariophysi) from the Upper Tapajós River Basin." Check List 8, no. 3 (2012): 592. http://dx.doi.org/10.15560/8.3.592.

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The first report of Sartor (Anostomidae) and Tatia intermedia (Auchenipteridae) for the Upper Tapajós River Basin are presented here. Sartor is very rare on collections, and is reported only from the Trombetas, Tocantins and Upper Xingu river basins. Tatia intermedia is registered in the upper reaches of the Araguaia, Tocantins, Xingu, and Capim rivers, tributaries of the lower Amazon River in Brazil, northwards to the Suriname coastal rivers and the Essequibo River in Guyana.

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Dagosta, Fernando, Murilo Pastana, and André Esguícero. "New records of fishes (Actinopterygii: Ostariophysi) from the Upper Tapajós River Basin." Check List 8, no. (3) (2012): 592–94. https://doi.org/10.15560/8.3.592.

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The first report of <em>Sartor </em>(Anostomidae) and <em>Tatia intermedia </em>(Auchenipteridae) for the Upper Tapajós River Basin are presented here. <em>Sartor </em>is very rare on collections, and is reported only from the Trombetas, Tocantins and Upper Xingu river basins. <em>Tatia intermedia </em>is registered in the upper reaches of the Araguaia, Tocantins, Xingu, and Capim rivers, tributaries of the lower Amazon River in Brazil, northwards to the Suriname coastal rivers and the Essequibo River in Guyana.

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Höhn, Helmut, and Marcondes Costa. "A EXPLORAÇÃO DE DIAMANTES NO RIO TOCANTINS." BOLETIM DO MUSEU DE GEOCIÊNCIAS DA AMAZÔNIA 6 (2019), no. 3 (2019): 1–26. http://dx.doi.org/10.31419/issn.2594-942x.v62019i3a18hh.

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Dornas, Túlio, Dianes Gomes Marcelino, Sidnei de Melo Dantas, Renato Torres Pinheiro, and Alexandre Aleixo. "Range extension and conservation of Psophia interjecta Griscom & Greenway, 1937 (Aves: Psophidae) in the Tocantins–Araguaia interfluve, state of Tocantins, Brazil." Check List 13, no. (4) (2017): 141–46. https://doi.org/10.15560/13.4.141.

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The genus <em>Psophia </em>includes terrestrial birds endemic to the Amazon. The number of species in this genus is still controversial, with alternative taxonomic treatments currently available. We present new and historical records of <em>P. interjecta</em> for the state of Tocantins, which extend this species’ range to the Tocantins–Araguaia interfluve, in southeasternmost Amazonia. <em>Psophia interjecta </em>is considered Vulnerable in Brazil, but we discuss that the species is likely more Critically Endangered in Tocantins due to drastic deforestation and hunting.

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6

Vari, Richard P., Carl J. Ferraris Jr., and Mário C. C. de Pinna. "The Neotropical whale catfishes (Siluriformes: Cetopsidae: Cetopsinae), a revisionary study." Neotropical Ichthyology 3, no. 2 (2005): 127–238. http://dx.doi.org/10.1590/s1679-62252005000200001.

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The catfishes of the subfamily Cetopsinae of the Neotropical family Cetopsidae are revised. Four genera, Cetopsidium new genus, Cetopsis, Denticetopsis, and Paracetopsis Bleeker are recognized as valid. Bathycetopsis, Hemicetopsis, and Pseudocetopsis are considered synonyms of Cetopsis and Paracetopsis Eigenmann & Bean and Cetopsogiton synonyms of Paracetopsis. Thirty-seven species are recognized in the Cetopsinae. Cetopsidium includes six species: C. ferreirai, new species, rio Trombetas; C. minutum, Essequibo River; C. morenoi, central and western portions of río Orinoco; C. orientale, c

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COELHO, FERNANDA L., CARINE C. CHAMON, and LUISA M. SARMENTO-SOARES. "A new species of driftwood catfish Centromochlus Kner, 1858 (Siluriformes, Auchenipteridae, Centromochlinae) from Tocantins-Araguaia River drainage." Zootaxa 4950, no. 1 (2021): 149–65. http://dx.doi.org/10.11646/zootaxa.4950.1.8.

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The genus Centromochlus includes eight catfish species in the Amazon and Orinoco river systems: C. schultzi from Xingu and Tocantins-Araguaia rivers; C. melanoleucus from Tapajós and Teles Pires rivers; C. macracanthus from Negro River; C. orca from Nhamundá River; C. heckelii and C. existimatus from Amazon and additionally at the Essequibo rivers; C. carolae and C. musaica from Orinoco River system. Recent field expeditions and collection examination revealed an undescribed species of Centromochlinae that has compatible features with Centromochlus. We herein describe a new species of Centromo

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8

Giongo, Patrícia, Wagner Martins Santana Sampaio, Frederico Belei, Fabricia Kohler de Carvalho, Anderson Fernandes, and Jorge Abdala Dergam. "Ichthyofauna of the Carrapato, Mutum and Caba Saco streams (Araguaia River Basin), Serra dos Carajás region, southeastern Pará, Brazil." Check List 7, no. 4 (2011): 517. http://dx.doi.org/10.15560/7.4.517.

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The ichthyofaunistic studies from the Tocantins-Araguaia River Basin are mainly concentrated in the main channel of the Araguaia and Tocantins rivers, due to faunal studies required for hydroelectric projects. Brooks and streams are usually neglected, though they represent the habitats most threatened by human activities. These small water courses present a great diversity of fishes, and they also have high rates of endemic species. The study was conducted from December 2009 to January 2010. For the inventory, the methodology used was the Rapid Assessment Program (RAP). In each sampled area th

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Giongo, Patrícia, Wagner Sampaio, Frederico Belei, Fabricia Carvalho, Anderson Fernandes, and Jorge Dergam. "Ichthyofauna of the Carrapato, Mutum and Caba Saco streams (Araguaia River Basin), Serra dos Carajás region, southeastern Pará, Brazil." Check List 7, no. (4) (2011): 517–21. https://doi.org/10.15560/7.4.517.

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The ichthyofaunistic studies from the Tocantins-Araguaia River Basin are mainly concentrated in the main channel of the Araguaia and Tocantins rivers, due to faunal studies required for hydroelectric projects. Brooks and streams are usually neglected, though they represent the habitats most threatened by human activities. These small water courses present a great diversity of fishes, and they also have high rates of endemic species. The study was conducted from December 2009 to January 2010. For the inventory, the methodology used was the Rapid Assessment Program (RAP). In each sampled area th

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FERREIRA, LEANDRO VALLE, DENISE A. CUNHA, PRISCILLA P. CHAVES, DARLEY C. L. MATOS, and PIA PAROLIN. "Impacts of hydroelectric dams on alluvial riparian plant communities in eastern Brazilian Amazonian." Anais da Academia Brasileira de Ciências 85, no. 3 (2013): 1013–23. http://dx.doi.org/10.1590/s0001-37652013000300012.

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The major rivers of the Amazon River basin and their biota are threatened by the planned construction of large hydroelectric dams that are expected to have strong impacts on floodplain plant communities. The present study presents forest inventories from three floodplain sites colonized by alluvial riparian vegetation in the Tapajós, Xingu and Tocantins River basins in eastern Amazonian. Results indicate that tree species of the highly specialized alluvial riparian vegetation are clearly distinct among the three river basins, although they are not very distinct from each other and environmenta

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Bartolette, Renata, Carolina Santos Vieira, Amille Ferreira Lima Santos, et al. "The ichthyofauna in the influence area of the Lajeado reservoir, Tocantins state, Brazil." Check List 13, no. 3 (2017): 2156. http://dx.doi.org/10.15560/13.3.2156.

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Five rivers and 13 streams in the influence area of the Lajeado reservoir (upper-middle Tocantins River) were sampled in 5 expeditions. A total of 194 fish species were recorded and with the Characiformes and Siluriformes predominant, following the observed pattern for the Neotropical region. As expected, the families with greater richness were Characidae, Loricariidae and Cichlidae. Three species listed as Endangered were collected: Mylesinus paucisquamatus Jégu & Santos, 1988, Melanorivulus litteratus (Costa, 2010) and Paratrygon aiereba (Müller & Henle, 1841).

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Bartolette, Renata, Carolina Vieira, amille Santos, et al. "The ichthyofauna in the influence area of the Lajeado reservoir, Tocantins state, Brazil." Check List 13, no. (3) (2017): 1–14. https://doi.org/10.15560/13.3.2156.

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Five rivers and 13 streams in the influence area of the Lajeado reservoir (upper-middle Tocantins River) were sampled in 5 expeditions. A total of 194 fish species were recorded and with the Characiformes and Siluriformes predominant, following the observed pattern for the Neotropical region. As expected, the families with greater richness were Characidae, Loricariidae and Cichlidae. Three species listed as Endangered were collected: <em>Mylesinus paucisquamatus </em>Jégu & Santos, 1988, <em>Melanorivulus litteratus</em> (Costa, 2010) and <em>Paratrygon aiereba </em>(Müller & Henle, 18

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Honda, Rubens Tomio, Igor Christo Miyahira, and Flávio Dias Passos. "At the doors of the Amazonian region: occurrence of Limnoperna fortunei (Dunker, 1857) (Mollusca, Bivalvia, Mytilidae) in the Tocantins River." Check List 21, no. 2 (2025): 248–54. https://doi.org/10.15560/21.3.248.

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The Tocantins river basin was one of the few regions in Brazil considered free of Golden Mussel, Limnoperna fortunei (Dunker, 1857). This is an invasive species that has been dispersing throughout South America since 1990. We report the first record of this species in the state of Tocantins. Its presence there represents a problem in the region and a major alert for the Amazon Basin. The Tocantins river basin constitutes one of the gateways to the Amazon Basin.

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Honda, Rubens Tomio, Igor Christo Miyahira, and Flávio Dias Passos. "At the doors of the Amazonian region: occurrence of Limnoperna fortunei (Dunker, 1857) (Mollusca, Bivalvia, Mytilidae) in the Tocantins River." Check List 21, no. 2 (2025): 248–54. https://doi.org/10.15560/21.2.248.

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The Tocantins river basin was one of the few regions in Brazil considered free of Golden Mussel, Limnoperna fortunei (Dunker, 1857). This is an invasive species that has been dispersing throughout South America since 1990. We report the first record of this species in the state of Tocantins. Its presence there represents a problem in the region and a major alert for the Amazon Basin. The Tocantins river basin constitutes one of the gateways to the Amazon Basin.

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15

Brasileiro, Cinthia A., Elaine M. Lucas, Hilton M. Oyamaguchi, Maria Tereza C. Thomé, and Marianna Dixo. "Anurans, Northern Tocantins River Basin, states of Tocantins and Maranhão, Brazil." Check List 4, no. 2 (2008): 185. http://dx.doi.org/10.15560/4.2.185.

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This study presents a list of anurans in the northern region of the Tocantins River Basin (states of Tocantins and Maranhão), with information regarding seasonality, habitat, and microhabitat. We recorded 38 species in 15 genera and seven families. Most species (47 %) occurred exclusively in open areas and only 11 % of the species were found in forest habitats. Around 82 % of species were observed in ponds and only 7 % occurred in streams. Regarding seasonality, 54 % were observed both in the rainy and dry seasons. The northern area of the Cerrado has being rapidly converted in monocultures an

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Brasileiro, Cinthia, Elaine Lucas, Hilton Oyamaguchi, Maria Thomé, and Marianna Dixo. "Anurans, Northern Tocantins River Basin, states of Tocantins and Maranhão, Brazil." Check List 4, no. (2) (2008): 185–97. https://doi.org/10.15560/4.2.185.

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This study presents a list of anurans in the northern region of the Tocantins River Basin (states of Tocantins and Maranhão), with information regarding seasonality, habitat, and microhabitat. We recorded 38 species in 15 genera and seven families. Most species (47 %) occurred exclusively in open areas and only 11 % of the species were found in forest habitats. Around 82 % of species were observed in ponds and only 7 % occurred in streams. Regarding seasonality, 54 % were observed both in the rainy and dry seasons. The northern area of the Cerrado has being rapidly converted in monocultures an

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Honda, Rubens Tomio, Igor Christo Miyahira, and Flávio Dias Passos. "At the doors of the Amazonian region: occurrence of Limnoperna fortunei (Dunker, 1857) (Mollusca, Bivalvia, Mytilidae) in the Tocantins River." Check List 21, no. (2) (2025): 248–54. https://doi.org/10.15560/21.2.248.

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The Tocantins river basin was one of the few regions in Brazil considered free of Golden Mussel, <em>Limnoperna fortunei</em> (Dunker, 1857). This is an invasive species that has been dispersing throughout South America since 1990. We report the first record of this species in the state of Tocantins. Its presence there represents a problem in the region and a major alert for the Amazon Basin. The Tocantins river basin constitutes one of the gateways to the Amazon Basin.

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Bove, Claudia, and C. Philbrick. "Rediscovery of a Neotropical rheophyte (Podostemaceae) after 160 years: implications for the location of conservation unit boundaries (Tocantins, Brazil)." Check List 10, no. (5) (2014): 1170–73. https://doi.org/10.15560/10.5.1170.

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Podostemaceae (angiosperms) occur only in swift river currents. <em>Podostemum flagelliforme </em>is a member of this family that was originally described by materials collected from the Tocantins River in 1844. The species was known only from the type collection until 2013, when the authors rediscovered it in the Balsas River (Tocantins), Brazil. The latter river does not occur in any current conservation unit. It is recommended that the margins of a proposed ecological corridor (Corredor Ecológico da Região do Jalapão) be adjusted to encompass the only known population of <em>Podostemum flag

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Costa, Wilson J. E. M., and Pedro F. Amorim. "A new miniature cryptic species of the seasonal killifish genus Spectrolebias from the Tocantins River basin, central Brazil (Cyprinodontiformes, Aplocheilidae)." Zoosystematics and Evolution 94, no. 2 (2018): 361–70. http://dx.doi.org/10.3897/zse.94.28085.

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The miniature seasonal killifish Spectrolebiascostae, first described for the middle Araguaia River basin, has been also recorded from two areas in the middle Tocantins River basin, from where male specimens exhibit some differences in their colour pattern. Analyses directed to species delineation (GMYC and bPTP), using a fragment of the mitochondrial gene COI, strongly support two species, S.costae from the Araguaia River basin and a new species from the Tocantins River basin. Spectrolebiasgracilis sp. n. is described on the basis of specimens collected from two localities separated by about

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Costa, Wilson J. E. M., and Pedro F. Amorim. "A new miniature cryptic species of the seasonal killifish genus Spectrolebias from the Tocantins River basin, central Brazil (Cyprinodontiformes, Aplocheilidae)." Zoosystematics and Evolution 94, no. (2) (2018): 359–68. https://doi.org/10.3897/zse.94.28085.

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The miniature seasonal killifish Spectrolebias costae, first described for the middle Araguaia River basin, has been also recorded from two areas in the middle Tocantins River basin, from where male specimens exhibit some differences in their colour pattern. Analyses directed to species delineation (GMYC and bPTP), using a fragment of the mitochondrial gene COI, strongly support two species, S. costae from the Araguaia River basin and a new species from the Tocantins River basin. Spectrolebias gracilis sp. n. is described on the basis of specimens collected from two localities separated by abo

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Bezerra, Alexandra Maria Ramos, Nelson Jorge da Silva Jr., and Jader Marinho-Filho. "The amazon bamboo rat Dactylomys dactylinus (Rodentia: Echimydae: Dactylomyinae) in the cerrado of central Brazil." Biota Neotropica 7, no. 1 (2007): 235–37. http://dx.doi.org/10.1590/s1676-06032007000100030.

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Until recently, the distribution of Dactylomys dactylinus was considered to be restricted to forest habitats from the western Amazon to the east of the Xingu River in Brazil. Individuals of D. dactylinus were rescued in January 1997 from the rising waters of the hydroelectric dam of Serra da Mesa, in Central Brazil. This record extends the southern limit of the distribution of D. dactylinus, and represents also the first occurrence of this species in the Cerrado biome. The specimens were collected in patches of gallery forest of the Tocantins River and its tributaries. The Tocantins is the mai

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Carvalho Pereira, Miziane de. "Ichthyofauna of the Middle Tocantins River, Imperatriz, Maranhão, Brazil." International Journal of Agriculture and Biology 33, no. 02 (2024): 330212. https://doi.org/10.17957/ijab/15.2272.

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Fish represent more than half of the vertebrate species in the world. In the Tocantins River, the second largest river by water flow in Brazil, there are a minimum of 520 species of fish. This work aims to list the diversity of the ichthyofauna present in the Cacau River, a tributary of the Tocantins River, which flows into the municipality of Imperatriz, Maranhão. The collections took place over a period of one year, every first week of the month, both in the rainy season (November to April) and in the dry season (May to October). The specimens were captured using cast nets and gillnets with

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Moreira, Lorena A., Danté B. Fenolio, Hélder Lúcio Rodrigues Silva, and Nelson Jorge da Silva Jr. "A preliminary list of the Herpetofauna from termite mounds of the cerrado in the Upper Tocantins river valley." Papéis Avulsos de Zoologia 49, no. 15 (2009): 183–89. http://dx.doi.org/10.1590/s0031-10492009001500001.

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Termite mounds are known to offer refuge and microhabitats to a great variety of invertebrates and vertebrates. In the valley of the upper Tocantins River, within areas of influence of hydroelectric power plants 4,000 termite mounds were surveyed to evaluate the diversity of amphibians and reptiles using these environments. Surveys in termite mounds from two other areas (Corumbá River and Araguaia River basins) were used for comparative purposes. The results for termitaria in the upper Tocantins river valley revealed nine families, 13 genera, and 25 species of amphibians, and 16 families, 32 g

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LANES, RAYQUE DE OLIVEIRA, and CIBELE RODRIGUES BONVICINO. "Reevaluation of Rhipidomys emiliae (J.A. Allen 1916) and description of a new Rhipidomys (Rodentia: Cricetidae) species from Amazonia and Cerrado." Zootaxa 5346, no. 5 (2023): 581–97. http://dx.doi.org/10.11646/zootaxa.5346.5.5.

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We present the revalidation of the sigmodontinae rodent species R. emiliae, as well as the description of a new species for the genus Rhipidomys. The maximum likelihood analysis recovers R. emiliae as sister species of the clade with Rhipidomys sp. nov. and R. ipukensis, with high bootstrap values. Comparisons between these species based on the external, cranial, and dental morphology identified several unique characters in Rhipidomys sp. nov., including more grayish brown color of the dorsal coat, subsquamosal fenestra wide and long, angular process ends in the same position of the end of con

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MARTINS, Jeronimo Carvalho, Israel Hidenburgo Aniceto CINTRA, and Valérie SARPEDONTI. "Seletividade da rede malhadeira na captura de Hemiodus unimaculatusno baixo Rio Tocantins, Amazônia, Brasil." Boletim do Instituto de Pesca 43, no. 2 (2017): 274–82. http://dx.doi.org/10.20950/1678-2305.2017v43n2p274.

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Leite, Olavo da Costa, Saulo de Oliveira Lima, Lawrence Nóbrega de Oliveira, et al. "MORPHOMETRIC CHARACTERIZATION OF PART OF MURICIZAL RIVER WATERSHED - TOCANTINS, BRAZIL." AGRI-ENVIRONMENTAL SCIENCES 5 (November 6, 2019): 0. http://dx.doi.org/10.36725/agries.v5i0.1184.

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The aim of this study was to carry out a superficial characterization on part of the watershed of Muricizal river, in Tocantins, from estimates based on given climatic and morphometric parameters. The river basin studied here comprises an area from the monitoring station of River Muricizal, at Muricilândia pluviometric station in Tocantins state code ANA 28150000 (- 7°08’43’’ and – 48°36’37’’, altitude 193m). The pluviometric stations were: code 748002, municipality of Nova Olinda - TO, 748003 municipality of Muricilândia – TO, and code 749000 municipality of Arapoema - TO. The basin under stu

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Garavello, JC, JP Garavello, and AK Oliveira. "Ichthyofauna, fish supply and fishermen activities on the mid-Tocantins River, Maranhão State, Brazil." Brazilian Journal of Biology 70, no. 3 (2010): 575–85. http://dx.doi.org/10.1590/s1519-69842010000300014.

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This article concerns an inventory of the ichthyofauna from the main channel of the mid-Tocantins River and studies on fisheries in this region including an evaluation of activities from Colônia de Pesca Z-35 of Estreito and Carolina in Tocantins and Maranhão States, Brazil, during 1999 and 2000. This study includes taxonomy and fishery data obtained from field collections and from interviews with the fishermen, carried out in March and July of 2001. The systematic record and fishery data were obtained from the most common species of the ichthyofauna of the mid-Tocantins River. A critical exam

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S.C., Silva Gabriel, Fábio F. Roxo, Luz E. Orrego, and Claudio Oliveira. "Description of a new catfish genus (Siluriformes, Loricariidae) from the Tocantins River basin in central Brazil, with comments on the historical zoogeography of the new taxon." ZooKeys 598 (June 14, 2016): 129–57. https://doi.org/10.3897/zookeys.598.7400.

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This study presents the description of a new genus of the catfish subfamily Neoplecostominae from the Tocantins River basin. It can be distinguished from other neoplecostomine genera by the presence of (1) three hypertrophied bicuspid odontodes on the lateral portion of the body (character apparently present in mature males); (2) a large area without odontodes around the snout; (3) a post-dorsal ridge on the caudal peduncle; (4) a straight tooth series in the dentary and premaxillary rows; (5) the absence of abdominal plates; (6) a conspicuous series of enlarged papillae just posterior to the

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Acioly, Thiago Machado da Silva, Marcelo Francisco da Silva, Letícia Almeida Barbosa, José Iannacone, and Diego Carvalho Viana. "Levels of Potentially Toxic and Essential Elements in Water and Estimation of Human Health Risks in a River Located at the Interface of Brazilian Savanna and Amazon Biomes (Tocantins River)." Toxics 12, no. 7 (2024): 444. http://dx.doi.org/10.3390/toxics12070444.

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The Tocantins–Araguaia basin is one of South America’s largest river systems, across three Brazilian states (Maranhão, Tocantins, and Pará), within the Legal Amazon region. Despite draining extensive Cerrado savanna and rainforest ecosystems, it has suffered significant degradation, notably in the past 40 years. Human activities, including agricultural expansion, deforestation, and the introduction of non-native species, have worsened the environmental damage, which is alarming since many residents and villages along the middle Tocantins River rely on it for water supply, recreation, and fishi

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Bezerra, Paulo Eduardo Silva, Adanna De Souza Andrade, and Milena Marília Nogueira de Andrade. "ANÁLISE MULTITEMPORAL DO RIO TOCANTINS NO MUNICÍPIO DE BAIÃO (PARÁ) APÓS A CONSTRUÇÃO DA BARRAGEM DA USINA HIDRELÉTRICA DE TUCURUÍ." InterEspaço: Revista de Geografia e Interdisciplinaridade 4, no. 12 (2018): 174. http://dx.doi.org/10.18764/2446-6549.v4n12p174-185.

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MULTITEMPORAL ANALYSIS OF THE TOCANTINS RIVER IN THE MUNICIPALITY OF BAIÃO (PARÁ) AFTER THE CONSTRUCTION OF THE TUCURUÍ HYDROELECTRIC POWER PLANTANALISIS MULTITEMPORAL DEL RÍO TOCANTINS EN EL MUNICIPIO DE BAIÃO (PARÁ) DESPUÉS DE LA CONSTRUCCIÓN DE LA CENTRAL HIDROELÉCTRICA DE TUCURUÍNas últimas décadas, grandes projetos hidroelétricos foram implantados na Amazônia, ocasionando diversos impactos ambientais. No estado do Pará, a construção da Usina Hidrelétrica (UHE) de Tucuruí conferiu modificações físicas no rio Tocantins. Em vista disso, este trabalho teve como principal objetivo analisar as

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CHAMON, CARINE C., and ILANA FICHBERG. "Rineloricaria quilombola: a new species of whiptail catfish (Siluriformes, Loricariidae, Loricariinae) from upper and middle Tocantins River basin, Brazil." Zootaxa 5194, no. 1 (2022): 58–70. http://dx.doi.org/10.11646/zootaxa.5194.1.3.

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The genus Rineloricaria comprises 69 valid species and has been considered monophyletic by some authors. The taxonomic history of Rineloricaria is quite complex, especially concerning its wide distribution and morphological plasticity that make it difficult to diagnose and describe new species. Even with the great species-richness of the genus and the huge diversity of the system, the Tocantins-Araguaia River basin hosts only three formally described species of Rineloricaria: R. hasemani, R. lanceolata, and R. osvaldoi, the former is known from lower Tocantins River, R. lanceolata widespread a

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Silva, Daniel Guimarães, José Roberto Dantas da Silva Junior, Filipe Milani de Souza, et al. "WRF-Hydro for Streamflow Simulation in the MATOPIBA Region within the Tocantins/Araguaia River Basin—Brazil: Implications for Water Resource Management." Water 15, no. 22 (2023): 3902. http://dx.doi.org/10.3390/w15223902.

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The effective management of water resources in regions with a high potential for water resources, such as the Tocantins/Araguaia Basin in Brazil, is crucial in the face of current climate change and urban and agricultural expansion. In this context, this study evaluates the WRF-Hydro hydrological model to simulate the flow of the Manuel Alves Pequeno, Vermelho, and Manuel Alves Grande rivers in the MATOPIBA region (encompassing areas from the states of Maranhão, Tocantins, Piauí, and Bahia), an agricultural frontier and the most key area in terms of grain production in Brazil. The aim is to an

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Rodrigues da Costa, Marlyson J., Paulo J. Siqueira do Amaral, Julio C. Pieczarka, et al. "Cryptic Species in Proechimys goeldii (Rodentia, Echimyidae)? A Case of Molecular and Chromosomal Differentiation in Allopatric Populations." Cytogenetic and Genome Research 148, no. 2-3 (2016): 199–210. http://dx.doi.org/10.1159/000446562.

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The spiny rats of the genus Proechimys have a wide distribution in the Amazon, covering all areas of endemism of this region. We analyzed the karyotype and cytochrome b (Cyt b) sequences in Proechimys goeldii from 6 localities representing 3 interfluves of the eastern Amazon. A clear separation of P. goeldii into 2 monophyletic clades was observed, both chromosomally and based on Cyt b sequences: cytotype A (2n = 26♀/27♂, NF = 42) for samples from the Tapajos-Xingu interfluve and cytotype B (2n = 24♀/25♂, NF = 42) for samples from the Xingu-Tocantins interfluve and east of the Tocantins River.

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Pelicice, Fernando Mayer, Angelo Antonio Agostinho, Alberto Akama, et al. "Large-scale Degradation of the Tocantins-Araguaia River Basin." Environmental Management 68, no. 4 (2021): 445–52. http://dx.doi.org/10.1007/s00267-021-01513-7.

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Medeiros, Marcelo Brilhante de, Bruno Machado Teles Walter, Glocimar Pereira da Silva, et al. "Vascular Flora of the Tocantins River Middle Basin, Brazil." Check List 8, no. 5 (2012): 852. http://dx.doi.org/10.15560/8.5.852.

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This study provides a checklist of the phanerogams and pteridophytes of the Tocantins river middle basin, in northern Goiás state and southern Tocantins state, Brazil. Herbarium samples were collected from 2000 to 2009 and this floristic survey recorded 1572 species from 135 families. The most species-rich families were Fabaceae (217), Poaceae (116), Asteraceae (88), Euphorbiaceae (65), Orchidaceae (58) and Malpighiaceae (56). Furthermore, 14 endangered species and 31 rare species were recorded, mainly associated with the campos rupestres in the Veadeiros Plateau region. The flora mainly from

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Junqueira, Rubens, Marcelo R. Viola, Carlos R. de Mello, Marcelo Vieira-Filho, Marcos V. G. Alves, and Jhones da S. Amorim. "Drought severity indexes for the Tocantins River Basin, Brazil." Theoretical and Applied Climatology 141, no. 1-2 (2020): 465–81. http://dx.doi.org/10.1007/s00704-020-03229-w.

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37

Medeiros, Marcelo, Bruno Walter, Glocimar Silva, et al. "Vascular Flora of the Tocantins River Middle Basin, Brazil." Check List 8, no. (5) (2012): 852–85. https://doi.org/10.15560/8.5.852.

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This study provides a checklist of the phanerogams and pteridophytes of the Tocantins river middle basin, in northern Goiás state and southern Tocantins state, Brazil. Herbarium samples were collected from 2000 to 2009 and this floristic survey recorded 1572 species from 135 families. The most species-rich families were Fabaceae (217), Poaceae (116), Asteraceae (88), Euphorbiaceae (65), Orchidaceae (58) and Malpighiaceae (56). Furthermore, 14 endangered species and 31 rare species were recorded, mainly associated with the <em>campos rupestres </em>in the Veadeiros Plateau region. The flora mai

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38

Nascimento, Maria Histelle Sousa, Deborah Gaído Aragão, Jordânia Leticia Nascimento Silva, et al. "The DNA barcode reveals cryptic diversity and a new record for the genus Leporinus (Characiformes, Anostomidae) in the hydrographic basins of central northern Brazil." PeerJ 11 (May 25, 2023): e15184. http://dx.doi.org/10.7717/peerj.15184.

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Leporinus is one of the most speciose genera of the order Characiformes, with 81 valid species distributed throughout much of Central and South America. The considerable diversity of this genus has generated extensive debate on its classification and internal arrangement. In the present study, we investigated the species diversity of the genus Leporinus in central northern Brazil, and conclude that six valid species—Leporinus maculatus, Leporinus unitaeniatus, Leporinus affinis, Leporinus venerei, Leporinus cf. friderici, and Leporinus piau—are found in the hydrographic basins of the Brazilian

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Medeiros, Marcelo Brilhante de, Bruno Machado Teles Walter, and Washington Luis Oliveira. "Floristic and structural comparisons between woody communities of two seasonal forest fragments in the Tocantins river basin and other remnants of this forest physiognomy in Brazil." Rodriguésia 65, no. 1 (2014): 21–33. http://dx.doi.org/10.1590/s2175-78602014000100002.

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This work describes the woody layer composition and structure in two seasonal forest fragments in the Tocantins river basin and compares them to other remnants of this forest physiognomy in Brazil. The survey was carried out by using 17 plot samples (20 × 50 m) located in Palmeirópolis, state of Tocantins, and in Minaçú, state of Goiás. All woody individuals showing diameters > 5 cm, at 1.30 cm above ground level, were recorded. The higher floristic similarity of these forest remnants compared with other closer seasonal forests did not show a distinct pattern. The floristic composition was

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Santana-Cornélio, Gilcilene, Elciomar Araújo-de-Oliveira, Keila Magalhães-Xavier, Gabriela Wemilly Barros-da-Silva, Luis Reginaldo Ribeiro Rodrigues, and Emil José Hernández-Ruz. "The genetic structure of Pristimantis latro (Anura: Craugastoridae) mirrors traits of their life history." Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales 44, no. 172 (2020): 729–39. http://dx.doi.org/10.18257/raccefyn.956.

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One of the main hypotheses to explain the origin of Amazonian diversity is the barrier effect of the rivers known as the riverine-barrier hypothesis, which suggests that riverine barriers isolated once continuous populations leading to differentiation and speciation. In this context, we studied the genetic structure of Pristimantis latro, a newly described species that inhabits a region under marked anthropic pressure due to expansive livestock, illegal mining, and hydroelectric dam construction. The DNA was extracted from 52 P. latro individuals and then amplified via polymerase chain reactio

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Dornas, Túlio, Willian Menq, Tiago Junqueira, and Estevão F. Santos. "The Tocantins-Araguaia Basin as a migratory route and a wintering area of Falco peregrinus (Aves, Falconidae)." Revista Brasileira de Ornitologia 27, no. 4 (2019): 284–90. http://dx.doi.org/10.1007/bf03546074.

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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.

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Benitez, Mauricio F., Juan C. Cerutti, Danilo R. Aichino, and Diego Baldo. "Morphological and molecular identification of Geophagus sveni Lucinda, Lucena & Assis, 2010 (Cichlidae, Cichliformes) from the Paraná river basin, Argentina." Check List 14, no. 5 (2018): 1053–58. http://dx.doi.org/10.15560/14.5.1058.

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During 2015, we collected several specimens of a cichlid tentatively assigned to Geophagus in Yacyretá reservoir in the Paraná river basin (Argentina). By means of morphological and molecular evidence, we identified these specimens as Gephagus sveni, a species known from middle portion of the Tocantins River. Here we report the presence of the genus Geophagus (sensu stricto) in Argentina for the first time.

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Benitez, Mauricio F., Juan C. Cerutti, Danilo R. Aichino, and Diego Baldo. "Morphological and molecular identification of Geophagus sveni Lucinda, Lucena & Assis, 2010 (Cichlidae, Cichliformes) from the Paraná river basin, Argentina." Check List 14, no. 6 (2018): 1053–58. http://dx.doi.org/10.15560/14.6.1058.

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During 2015, we collected several specimens of a cichlid tentatively assigned to Geophagus in Yacyretá reservoir in the Paraná river basin (Argentina). By means of morphological and molecular evidence, we identified these specimens as Gephagus sveni, a species known from middle portion of the Tocantins River. Here we report the presence of the genus Geophagus (sensu stricto) in Argentina for the first time.

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Oppenheimer, Marina, and Luís Fábio Silveira. "A taxonomic review of the Dark-winged Trumpeter Psophia viridis (Aves: Gruiformes: Psophiidae)." Papéis Avulsos de Zoologia 49, no. 41 (2009): 547–55. http://dx.doi.org/10.1590/s0031-10492009004100001.

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The Dark-winged Trumpeter, Psophia viridis (Gruiformes, Psophiidae) is a Brazilian endemic species and includes three subspecies: Psophia viridis viridis Spix, 1825; Psophia v. dextralis Conover, 1934, and Psophia v. obscura Pelzeln, 1857, as well as P. v. interjecta Griscom & Greenway, 1937, whose validity has been questioned by several authors. These taxa are allopatric in distribution along the south of the Amazon River, although the precise limits of their distribution still remain unknown. This complex has never been taxonomically reviewed and this work aims to test the validity of it

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Höhn, Helmut, and Marcondes Costa. "MINERAIS INDICADORES E/OU ACOMPANHANTES (“SATÉLITES”) DOS DIAMANTES DE SÃO JOÃO DO ARAGUAIA NO ESTADO DO PARÁ (AMAZÔNIA)." Boletim do Museu de Geociências da Amazônia 9, no. 1 (2022): 1–14. http://dx.doi.org/10.31419/issn.2594-942x.v92022i1a4hhn.

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The concentrates obtained during the extraction of diamond and gold in the bed of the Tocantins River (Tocantins River Lower Basin) in front of the city of São João do Araguaia, state of Pará, were analyzed by using stereomicroscope, x ray diffraction (XRD) and scanning electron microscope with energy dispersive spectrometry (SEM/EDS) to identify their indicator and/or accompanying minerals (satellite minerals). Of note are kyanite, corundum, garnets, chrysoberyl, staurolite and florencite. These minerals are given popular names in national use among prospectors. Corundum is available in ruby

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46

MENDES, Laís Aguiar da Silveira, Etiene Fabbrin PIRES, Maria Ecilene Nunes da Silva MENESES, and Hermann BEHLING. "Vegetational changes during the last millennium inferred from a palynological record from the Bananal Island, Tocantins, Brazil." Acta Amazonica 45, no. 2 (2015): 215–30. http://dx.doi.org/10.1590/1809-4392201402265.

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The Bananal Island is regarded the largest fluvial island in the world, bounded by Araguaia and Javaés rivers, being located in southwest of Tocantins. The objectives of this work were to provide information about the vegetational changes that occurred at the Bananal Island, in order to contribute to the understanding the dynamics of past and current savanna and areas of ecotones with forests. Thus, a sedimentary core collected from a small lake at the Bananal Island plain was submitted to pollen and radiocarbon dating analyses. The results showed that the last millennium was dominated by fore

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47

Chamon, Carine C., and Ilana Fichberg. "Rineloricaria quilombola: a new species of whiptail catfish (Siluriformes, Loricariidae, Loricariinae) from upper and middle Tocantins River basin, Brazil." Zootaxa 5194, no. 1 (2022): 58–70. https://doi.org/10.11646/zootaxa.5194.1.3.

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Chamon, Carine C., Fichberg, Ilana (2022): Rineloricaria quilombola: a new species of whiptail catfish (Siluriformes, Loricariidae, Loricariinae) from upper and middle Tocantins River basin, Brazil. Zootaxa 5194 (1): 58-70, DOI: 10.11646/zootaxa.5194.1.3

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Lacerda, A. C. F., R. M. Takemoto, N. C. Marchiori, M. L. Martins, and G. C. Pavanelli. "New species of Cucullanus (Nematoda: Cucullanidae), an intestinal parasite of the peacock bass Cichla piquiti (Perciformes: Cichlidae) from the Tocantins River, Brazil." Journal of Helminthology 89, no. 1 (2013): 9–12. http://dx.doi.org/10.1017/s0022149x13000485.

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AbstractCucullanus tucunarensis n. sp. (Cucullanidae) is described parasitizing the peacock bass Cichla piquiti (Cichlidae) from the Tocantins River, Tocantins State, Brazil. The new species is unique and differs from all its congeners by having a tail tip provided with several sclerotized spine-like processes on its ventral side, present in both the male and female. Furthermore, C. tucunarensis n. sp. is compared with other species of the genus recorded in the same zoogeographical region and in the same group of hosts (Perciformes).

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Baturin, G. N., and V. V. Gordeev. "Geochemistry of suspended matter in the Amazon river waters." Геохимия 64, no. 2 (2019): 195–205. http://dx.doi.org/10.31857/s0016-7525642195-205.

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The duplicate samples of the Amazon River suspended matter (SM) collected during Cruise 9th of R/V Professor Shtokman were studied using modern analytical techniques. Waters of the Amazon basin are subdivided into three main types differing in SM content and chemical composition: white (turbid yellow waters of the Amazon River and Madeira tributary), clear (transparent waters of the large Xingu, Tapajós, Trombetas, and Tocantins tributaries) and black (waters with strong coffer color, high content of dissolved organics, and elevated acidity, Riu Negro). The specific features of SM from differe

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Da Silva Jr., Nelson Jorge, Breno Hamdan, Itamar Jr Tonial, Hélder Lúcio R. Da Silva, and Carlos Eduardo D. Cintra. "Hydrodynastes melanogigas Franco, Fernandes and Bentim, 2007 (Squamata: Serpentes: Colubridae): Range extension and new state record." Check List 8, no. 4 (2012): 813. http://dx.doi.org/10.15560/8.4.813.

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Two specimens of the poorly known Colubridae snake Hydrodynastes melanogigas were collected in the municipality of Carolina, southwestern state of Maranhão in gallery forests on the Tocantins River. These records represent the northernmost locality for the species.

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