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Journal articles on the topic 'Amazonas river basin'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Costa, Wilson. "Phylogeny and evolutionary radiation in seasonal rachovine killifishes: biogeographical and taxonomical implications." Vertebrate Zoology 64 (July 15, 2014): 177–92. https://doi.org/10.3897/vz.64.e31478.

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A phylogenetic analysis combining available mitochondrial DNA sequences (total of 3,339 bp) and 161 morphological characters for 22 species of rachovine genera (Aphyolebias, Austrofundulus, Gnatholebias, Llanolebias, Micromoema, Moema, Neofundulus, Pterolebias, Rachovia, Renova, Terranatos, and Trigonectes), and 16 outgroups, supports monophyly of the group containing genera endemic to the Orinoco river basin and adjacent coastal drainages. Results of the present analysis are compared to previous studies. The tree topology indicates that the genera Moema and Rachovia as presently delimited are

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2

Escalona, Tibisay. "New and unusual field records of Chelus spp. in Venezuela (Testudines: Chelidae)." Anartia, no. 38 (September 12, 2024): 52–63. https://doi.org/10.5281/zenodo.13755882.

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New and unusual records on <em>Chelus</em> turtles in Venezuela are provided: Lake Maracaibo Basin in Zulia state; Santa Rosa-Putucual Lagoon Swamp, Gulf of Paria Basin, Sucre state; Caura River Basin, Bolívar state; and Casiquiare River Canal, Amazonas state.

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LIMA, FLÁVIO C. T. "A revision of the cis-andean species of the genus Brycon Müller & Troschel (Characiformes: Characidae)." Zootaxa 4222, no. 1 (2017): 1. http://dx.doi.org/10.11646/zootaxa.4222.1.1.

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A revision of the cis-andean species of Brycon, with the exception of the Brycon pesu species-complex, is presented. Twenty-one Brycon species (including B. pesu) are recognized from cis-andean river systems: Brycon stolzmanni Steindachner, from the upper Río Marañon basin, Peru; Brycon coxeyi Fowler, from the Río Marañon basin, Ecuador and Peru; Brycon polylepis Moscó Morales, from the Lago de Maracaibo, Río Orinoco, upper rio Amazonas, and rio Tocantins basins, Venezuela, Colombia, Peru, and Brazil; Brycon coquenani Steindachner, from the upper Río Caroni, Río Orinoco basin, Venezuela; Bryco

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4

Queiroz, Matheus Silveira de, and José Alberto Lima de Carvalho. "GEOMORPHOLOGICAL CHARACTERIZATION OF THE TARUMÃ-AÇÚ BASIN, AMAZONAS, BRAZIL." Brazilian Geographical Journal 11, no. 2 (2020): 113–25. http://dx.doi.org/10.14393/bgj-v11n2-a2020-57878.

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The purpose of this work was to analyze the geomorphology of the Tarumã-Açú basin according to morphometric, slope, topographical parameters to understand the current dynamics of the basin geomorphological. Morphometric analysis indicated a low tendency to erosion in the Basin. The flat slope is located near the mouth of the Tarumã-Açú river and the largest slopes indicate terraces and dividers and most of the basin is characterized by small and medium hills (3-20 %). The basin has a strong structural control represented by a Strike-Slip Fault that controls the Tarumã-Açú River and the tributa

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Padilha, Rinaldo Marques, and Célia Alves de Souza. "Dinâmica fluvial na bacia hidrográfica do rio Carapá, inserida na bacia do rio Amazonas." Revista Brasileira de Geografia Física 11, no. 4 (2018): 1490–511. http://dx.doi.org/10.26848/rbgf.v11.4.p1490-1511.

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6

da, Fonseca Ivanny Coelho, Luan Aércio Melo Maciel, Frank Raynner Vasconcelos Ribeiro, and Luís Reginaldo Ribeiro Rodrigues. "Karyotypic variation in the long-whiskered catfish Pimelodus blochii Valenciennes, 1840 (Siluriformes, Pimelodidae) from the lower Tapajós, Amazonas and Trombetas Rivers." Comparative Cytogenetics 12, no. (3) (2018): 285–98. https://doi.org/10.3897/CompCytogen.v12i3.22590.

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The genus Pimelodus LaCépède, 1803 comprises 35 formally recognized species distributed along the major neotropical river basins. Despite conservatism in diploid number with 2n=56, an intense variation of chromosomal morphology (karyotypic formula) has been documented in Pimelodus species. In the present study, we analyzed karyotypes of 20 specimens, identified as Pimelodus blochii Valenciennes, 1840 and collected from the lower courses of the Tapajós, Amazonas and Trombetas Rivers. The karyotypes were characterized by Giemsa conventional staining, C-banding, silver staining (Ag-NOR) and fluor

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Montaña, Carmen G., Hernán López-Fernández, and Donald C. Taphorn. "A new species of Crenicichla (Perciformes: Cichlidae) from the Ventuari River, Upper Orinoco River Basin, Amazonas State, Venezuela." Zootaxa 1856 (December 31, 2008): 33–40. https://doi.org/10.5281/zenodo.183553.

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Montaña, Carmen G., López-Fernández, Hernán, Taphorn, Donald C. (2008): A new species of Crenicichla (Perciformes: Cichlidae) from the Ventuari River, Upper Orinoco River Basin, Amazonas State, Venezuela. Zootaxa 1856: 33-40, DOI: 10.5281/zenodo.183553

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8

Dal, Vechio Francisco, Jr. Mauro Teixeira, Renato Recoder, Sena Marco de, Sergio Souza, and Miguel Rodrigues. "Distribution extension and revised map of Erythrolamprus pygmaeus (Cope, 1868) (Serpentes: Dipsadidae)." Check List 11, no. (4) (2015): 1–4. https://doi.org/10.15560/11.4.1719.

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We provide geographic data for the poorly known dipsadid <em>Erythrolamprus pygmaeus</em>, including the first record in Rondônia state, as well a new record in central Amazon at lower Purus River, Amazonas state. Additionally we review its distribution in Pará state.

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9

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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10

LEHMANN A., PABLO, FLÁVIO C. T. LIMA, and ROBERTO E. REIS. "Parotocinclus yaka, a new species of armored catfish (Loricariidae: Hypoptopomatinae), from the Amazon basin in Brazil." Zootaxa 4521, no. 4 (2018): 584. http://dx.doi.org/10.11646/zootaxa.4521.4.7.

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Parotocinclus yaka is described as a new species of hypoptopomatine cascudinho from tributaries of the Rio Tiquié, tributary to the Rio Uaupés, upper Rio Negro drainage, Amazon basin, Amazonas State, Brazil. The new species is distinguished from its congeners in northeastern and southeastern Brazil by having the cheek canal plate elongated posteriorly on the ventral surface of the head and in contact with the cleithrum. Parotocinclus yaka is diagnosed from the Parotocinclus species of the Amazon, Orinoco and Guianas watersheds by having a conspicuous dark spots smaller than the pupil diameter

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Espinoza, Jhan Carlo, Josyane Ronchail, Frédéric Frappart, Waldo Lavado, William Santini, and Jean Loup Guyot. "The Major Floods in the Amazonas River and Tributaries (Western Amazon Basin) during the 1970–2012 Period: A Focus on the 2012 Flood*." Journal of Hydrometeorology 14, no. 3 (2013): 1000–1008. http://dx.doi.org/10.1175/jhm-d-12-0100.1.

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Abstract In this work, the authors analyze the origin of the extreme floods in the Peruvian Amazonas River during the 1970–2012 period, focusing on the recent April 2012 flooding (55 400 m3 s−1). Several hydrological variables, such as rainfall, terrestrial water storage, and discharge, point out that the unprecedented 2012 flood is mainly related to an early and abundant wet season over the north of the basin. Thus, the peak of the Marañón River, the northern contributor of the Amazonas, occurred sooner than usual (in April instead of May), coinciding with the peak of the Ucayali River, the s

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Calegari, Bárbara B., Alberto Akama, and Roberto E. Reis. "First record of the driftwood catfish Spinipterus acsi Akama & Ferraris, 2011 (Siluriformes, Auchenipteridae) for Brazil, Juruá River, Amazon basin." Check List 14, no. 4 (2018): 693–97. http://dx.doi.org/10.15560/14.4.693.

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Spinipterus Akama & Ferraris, 2011 is a monotypic genus known only by the holotype of its single species S. acsi, described from a creek tributary to the Nanay River, in the Peruvian portion of the Amazon basin. A second specimen of this genus and species representing the first record of occurrence in Brazil is reported from the Juruá River, upper Amazon basin, Amazonas state.

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Lima, Alexandre de O., Nildo da S. Dias, Francisco P. Lima Filho, Miguel Ferreira Neto, Priscila R. do A. Rego, and Anderson de M. Souza. "Hydrochemistry of alluvial aquifer in the Cobra River sub-basin." Revista Brasileira de Engenharia Agrícola e Ambiental 21, no. 11 (2017): 785–90. http://dx.doi.org/10.1590/1807-1929/agriambi.v21n11p785-790.

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ABSTRACT The regional characteristics of waters from alluvial aquifers are different, since they depend on geology and climate. Also, there may be local variation in the quality of the available water when the water source is superficial (rivers and lakes) or is underground due to geology. In order to investigate the groundwater quality of the alluvial aquifer in the Sub-Basin of the Cobra River (RN) for construction of underground dams, five wells, four in the main river and one in the tributary, were monitored in dry and rainy seasons, during two hydrological years. Fifteen water samples fro

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Calegari, Bárbara B., Alberto Akama, and Roberto E. Reis. "First record of the driftwood catfish Spinipterus acsi Akama & Ferraris, 2011 (Siluriformes, Auchenipteridae) for Brazil, Juruá River, Amazon basin." Check List 14, no. (4) (2018): 693–97. https://doi.org/10.15560/14.4.693.

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<em>Spinipterus</em> Akama & Ferraris, 2011 is a monotypic genus known only by the holotype of its single species <em>S. acsi</em>, described from a creek tributary to the Nanay River, in the Peruvian portion of the Amazon basin. A second specimen of this genus and species representing the first record of occurrence in Brazil is reported from the Juruá River, upper Amazon basin, Amazonas state.

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15

Guimarães, Maria Eduarda Santos, Luiz Antônio dos Santos Dias, Caio Márcio Vasconcelos Cordeiro de Almeida, Carlos Alberto Spaggiari Souza, Odimar Ferreira Almeida, and Thais Roseli Corrêa. "Genetic variability of cocoa from the amazon basin: implications for genetic conservation." Bioscience Journal 39 (February 3, 2023): e39020. http://dx.doi.org/10.14393/bj-v39n0a2023-63126.

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The cocoa and chocolate production chain involves US$60 billion annually and three million farmers around the world, in an area exceeding nine million hectares. The use of wild germplasm will enable to generate new disease- and pest-resistant cultivars and ability to adapt to changing environments. Here we evaluated 145 cocoa accessions, originated from nine Amazonian basins, based on eight fruit traits. Univariate anova showed significant differences (p<0.05) for all traits. For seven traits, the variance component within basins was higher (81.5%, on average). Therefore, it is recommended

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16

Pedroza, Wellington, Frank Ribeiro, Túlio Teixeira, Willian Ohara, and Lúcia Py-Daniel. "Ichthyofaunal survey of stretches of the Guariba and Rooselvelt Rivers, in Guariba State Park and Guariba Extractive Reserve, Madeira River basin, Amazonas, Brazil." Check List 8, no. (1) (2012): 8–15. https://doi.org/10.15560/8.1.008.

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The fishes presented herein were collected in small streams, in channel of lagoons and in the main channel of the Guariba River, as well as in one tributary of the right bank of the Roosevelt River, both clear-water tributaries of Aripuanã River, Madeira River basin. Field work was carried out in November 2008, during the low water season. Sampling resulted in 3924 specimens belonging to 160 species distributed in 34 families, and seven orders. Eight species are recognized as new, two of which were recently described. This study represents the first fish survey for the region and will certainl

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17

Pereira, Andreia Cavalcante, Lezilda Carvalho Torgan, and Sergio Melo. "Four new Pinnularia Ehrenberg (Bacillariophyta, Pinnulariaceae) species from Amazonian black water (Tupé Lake, Amazonas State, Brazil)." Phytotaxa 158, no. 2 (2014): 154. http://dx.doi.org/10.11646/phytotaxa.158.2.3.

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Tupé Lake belongs to one of the Sustainable Development Reserves in the Negro River Basin, Amazonas State, Brazil. It connects to the Negro river by a channel, so its level varies according to the floods of the river. The water has low pH (< 5), low conductivity (< 7.60 µS.cm-1) and high temperature (> 28.5ºC). During a taxonomic study of the genus Pinnularia, four new species are described: P. manausensis Pereira & Torgan, P. nelsonii Pereira & Torgan, P. tupensis Pereira, Melo & Torgan and P. walkerae Pereira & Torgan. The study was based on samples taken during Octo

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18

Londoño-Burbano, Alejandro, César Román-Valencia, and Donald C. Taphorn. "Taxonomic review of Colombian Parodon (Characiformes: Parodontidae), with descriptions of three new species." Neotropical Ichthyology 9, no. 4 (2011): 709–30. http://dx.doi.org/10.1590/s1679-62252011000400003.

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We review species of Parodon Valenciennes, 1850 from the Magdalena, Cauca, Orinoco, Amazonas, Atrato and Caribbean-Guajira River basins of Colombia using meristic and morphological characters. We recognize eight valid species, five previously described: P. apolinari Myers, from the Orinoco River basin; P. buckleyi Boulenger and P. pongoensis (Allen) from the upper Amazon; P. caliensis Boulenger, from the upper Cauca River drainage; and P. suborbitalis Valenciennes, from Lake Maracaibo basin. Three new species are described: P. alfonsoi, from the lower Magdalena River drainage; P. magdalenensis

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Lehmann A., Pablo, Lucas J. Schvambach, and Roberto E. Reis. "A new species of the armored catfish Parotocinclus (Loricariidae: Hypoptopomatinae), from the Amazon basin in Colombia." Neotropical Ichthyology 13, no. 1 (2015): 47–52. http://dx.doi.org/10.1590/1982-0224-20140113.

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A new species of hypoptopomatine cascudinho is described from a creek tributary to the Amazon River in Leticia, Amazonas Departament, Colombia. The new species of Parotocinclus is distinguished from congeners from northeastern to southeastern Brazilian rivers in having the cheek canal plate elongated posteriorly on the ventral surface of head and contacting the cleithrum. It is diagnosed from P. collinsae (Essequibo River basin, Guiana) and P. halbothi (rio Trombetas basin, Brazil and Marowijne River, Suriname), by having a triangular patch of dark pigmentation on the anterior portion of the d

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SIMÕES, PEDRO IVO, JOÃO CARLOS LOPES COSTA, FERNANDO J. M. ROJAS-RUNJAIC, et al. "A new species of Phyzelaphryne Heyer, 1977 (Anura: Eleutherodactylidae) from the Japurá River basin, with a discussion of the diversity and distribution of the genus." Zootaxa 4532, no. 2 (2018): 203. http://dx.doi.org/10.11646/zootaxa.4532.2.2.

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We describe and name the second species of Phyzelaphryne (Brachycephaloidea, Eleutherodactylidae), from northwestern Brazilian Amazonia. Phyzelaphryne nimio sp. nov. is distinguished from its only congener, Phyzelaphryne miriamae, by its smaller body size and the anatomy of the carpal and metacarpal regions, with relatively larger (sometimes fused) supernumerary carpal and metacarpal tubercles. Molecular phylogenetic analyses based on fragments of the mitochondrial genes 16S rRNA and COI suggest that the currently known distribution of the species is restricted to its type locality and other a

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Costa, Wilson. "Phylogeny and evolutionary radiation in seasonal rachovine killifishes: biogeographical and taxonomical implications." Vertebrate Zoology 64, no. 2 (2014): 177–92. http://dx.doi.org/10.3897/vz.64.e31478.

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A phylogenetic analysis combining available mitochondrial DNA sequences (total of 3,339 bp) and 161 morphological characters for 22 species of rachovine genera (Aphyolebias, Austrofundulus, Gnatholebias, Llanolebias, Micromoema, Moema, Neofundulus, Pterolebias, Rachovia, Renova, Terranatos, and Trigonectes), and 16 outgroups, supports monophyly of the group containing genera endemic to the Orinoco river basin and adjacent coastal drainages. Results of the present analysis are compared to previous studies. The tree topology indicates that the genera Moema and Rachovia as presently delimited are

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22

Zatti, Suellen A., Stephen D. Atkinson, Antônio A. M. Maia, Jerri L. Bartholomew, and Edson A. Adriano. "Ceratomyxa gracillima n. sp. (Cnidaria: Myxosporea) provides evidence of panmixia and ceratomyxid radiation in the Amazon basin." Parasitology 145, no. 9 (2018): 1137–46. http://dx.doi.org/10.1017/s0031182017002323.

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AbstractWe describe a new freshwater myxosporean species Ceratomyxa gracillima n. sp. from the gall bladder of the Amazonian catfish Brachyplatystoma rousseauxii; the first myxozoan recorded in this host. The new Ceratomyxa was described on the basis of its host, myxospore morphometry, ssrDNA and internal transcribed spacer region (ITS-1) sequences. Infected fish were sampled from geographically distant localities: the Tapajós River, Pará State, the Amazon River, Amapá State and the Solimões River, Amazonas State. Immature and mature plasmodia were slender, tapered at both ends, and exhibited

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23

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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Camargo, Mauricio, and Tommaso Giarrizzo. "Fish, Marmelos Conservation Area (BX044), Madeira River basin, states of Amazonas and Rondônia, Brazil." Check List 3, no. 4 (2007): 291. http://dx.doi.org/10.15560/3.4.291.

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The present study provides a species list of fish from the Marmelos River Area – BX044 in the states of Amazonas and Rondônia in northern Brazil. During a Rapid Ecological Assessment (REA) performed in October and November of 2003, 133 fish species from six orders and 24 families were recorded. The most diverse families were Characidae (47 species), Cichlidae (15 species), Loricariidae (12 species) and Pimelodidae (7 species). 23 fish species were common to the entire river basin and 4 were endemic to the aquatic system studied.

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Camargo, Mauricio, and Tommaso Giarrizzo. "Fish, Marmelos Conservation Area (BX044), Madeira River basin, states of Amazonas and Rondônia, Brazil." Check List 3, no. (4) (2007): 291–96. https://doi.org/10.15560/3.4.291.

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The present study provides a species list of fish from the Marmelos River Area – BX044 in the states of Amazonas and Rondônia in northern Brazil. During a Rapid Ecological Assessment (REA) performed in October and November of 2003, 133 fish species from six orders and 24 families were recorded. The most diverse families were Characidae (47 species), Cichlidae (15 species), Loricariidae (12 species) and Pimelodidae (7 species). 23 fish species were common to the entire river basin and 4 were endemic to the aquatic system studied.

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Santos-Silva, André Ricardo Ghidini Edinaldo Nelson dos. "Composition, abundance, and diversity of limnetic cladocerans (Crustacea: Anomopoda and Ctenopoda) in a black-water lake in the Negro River basin, Amazonas State, Brazil." Nauplius 26 (September 13, 2018): 1–10. https://doi.org/10.1590/2358-2936e2018018.

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Santos-Silva, André Ricardo Ghidini Edinaldo Nelson dos (2018): Composition, abundance, and diversity of limnetic cladocerans (Crustacea: Anomopoda and Ctenopoda) in a black-water lake in the Negro River basin, Amazonas State, Brazil. Nauplius (e2018018) 26: 1-10, DOI: 10.1590/2358-2936e2018018, URL: https://doi.org/10.1590/2358-2936e2018018

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CASATTI, LILIAN. "Taxonomy of the South American genus Pachypops Gill 1861 (Teleostei: Perciformes: Sciaenidae), with the description of a new species." Zootaxa 26, no. 1 (2002): 1. http://dx.doi.org/10.11646/zootaxa.26.1.1.

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Pachypops is a South American freshwater sciaenid genus characterized by having two anal-fin spines, three mental barbels, an inferior mouth, a swimbladder with a pair of short appendages anteriorly and a pair of longer appendages projected posteriorly, and the haemal spine of the first caudal distinctly expanded. Three valid Pachypops species are recognized herein. Of the six nominal species previously assigned to Pachypops, two are herein recognized as valid (Perca fourcroi and Micropogon trifilis), two are assigned to other sciaenid genera (Pachypops adspersus and Pachypops cevegei) and two

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CORTÉS-HERNÁNDEZ, MIGUEL ÁNGEL, ALEJANDRO MÉNDEZ-LÓPEZ, and CARLOS DONASCIMIENTO. "New records of Pimelodella (Siluriformes, Heptapteridae) from Colombia for the Amazon River basin, and redescription of P. serrata." Zootaxa 5293, no. 1 (2023): 185–95. http://dx.doi.org/10.11646/zootaxa.5293.1.10.

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We recorded Pimelodella bockmanni and P. serrata for the first time for Colombia, based on specimens collected in tributaries from the main channel of the Amazonas River, in the so-called Trapecio Amazónico, in the southernmost region of this country. We also present morphometric, meristic, and osteological data of the examined material, and provide a complementary morphological description of the poorly known P. serrata, a species known only from the Madeira River drainage in Bolivia and Brazil.

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Villar Quintana, Anthony Alex, Idelfonso Tii Impi, and Junias Antich Petsa. "Ancestral cultures of the lower basin of the Santiago River, an approach from the Apinkras Creek, in Villa Gonzalo (district of Río Santiago, Condorcanqui-Amazonas)." Revista Científica Pakamuros 12, no. 2 (2024): 27–44. http://dx.doi.org/10.37787/0nnh5h91.

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In this research we dive into an area scarcely known by Amazonian and Peruvian archaeology, the Kanu sor Santiago River basin, the border area between the Sub-Andean Zone and the Amazonian plain. Through the recognition of an archaeological site in Apinkras Creek, current territory of the Wampis community of Villa Gonzalo (district of Río Santiago, Condorcanqui-Amazonas) and a subsequent analysis of the associated cultural material, we seek to approach the antiquity and the characterization of the societies that elaborated these objects during their permanence in the area. In this way, we iden

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Méndez-López, Alejandro, and Alexander Urbano-Bonilla. "Moenkhausia hemigrammoides Géry, 1965 (Characidae, Stethaprioninae) in Colombia: new records and comments on morphology." Check List 15, no. 5 (2019): 867–74. http://dx.doi.org/10.15560/15.5.867.

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Moenkhausia hemigrammoides G&eacute;ry, 1965 was described from Suriname and recently found in the Ariari drainage, part of the Orinoco river basin. Here, we formally report the presence of this species in the Ariari and In&iacute;rida drainages of the Guaviare River and present morphological data that complement the original description. Our records of M. hemigrammoides represent the westernmost distribution for this Guianan species in the Amazonas&ndash;Orinoco transition zone.

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Méndez-López, Alejandro, and Alexander Urbano-Bonilla. "Moenkhausia hemigrammoides Géry, 1965 (Characidae, Stethaprioninae) in Colombia: new records and comments on morphology." Check List 15, no. (5) (2019): 867–74. https://doi.org/10.15560/15.5.867.

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<em>Moenkhausia hemigrammoides</em> Géry, 1965 was described from Suriname and recently found in the Ariari drainage, part of the Orinoco river basin. Here, we formally report the presence of this species in the Ariari and Inírida drainages of the Guaviare River and present morphological data that complement the original description. Our records of <em>M. hemigrammoides </em>represent the westernmost distribution for this Guianan species in the Amazonas–Orinoco transition zone.

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Cavalcanti, Mauro José, Paulo Roberto Duarte Lopes, and Santos-Silva Edinaldo Nelson dos. "Panbiogeographic analysis of the distribution patterns of the freshwater species of Sciaenidae (Actinopterygii: Perciformes) in the Amazon Basin." Tropical Diversity 1, no. 1 (2019): 5–11. https://doi.org/10.5281/zenodo.11099697.

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The Sciaenidae include four genera (<em>Pachypops</em>, <em>Pachyurus</em>, <em>Petilippinis</em> and <em>Plagioscion</em>) and about 20 species restricted to freshwater, distributed in South American rivers. In this paper, the distribution of 10 species of freshwater Sciaenidae occurring in the Amazon Basin, belonging to the genera <em>Pachypops</em>, <em>Pachyurus</em>, <em>Petilippinis</em> and <em>Plagioscion</em>, was analyzed by the panbiogeographic quantitative methods. By means of track analysis, three generalized tracks and six biogeographic nodes were found. The main massing of the s

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Mansur, Maria C. D., and Daniel M. Pimpão. "Triplodon chodo, a new species of pearly fresh water mussel from the Amazon Basin (Mollusca: Bivalvia: Unionoida: Hyriidae)." Revista Brasileira de Zoologia 25, no. 1 (2008): 111–15. http://dx.doi.org/10.1590/s0101-81752008000100015.

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A new species of the genus Triplodon Spix, 1827 is described based on shell samples collected on Rivers Jamari (Rondônia State) and Aripuanã (Amazonas State) from the Madeira River Basin; on the Amazon at Oriximiná and on the mouth of Tapajós River at Alter do Chão (Pará State). Triplodon chodo is a new species considered closely related to T. stevensi Lea, 1871, (described from the part of the River Essequibo which borders the Guianas). Triplodon chodo is distinguished from the latter by its smaller, lighter shell, the absence of a wing in the anterior region and by the delicate shape of the

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FARROÑAY, FRANCISCO, RICARDO DE OLIVEIRA PERDIZ, EDUARDO MAGALHÃES BORGES PRATA, and ALBERTO VICENTINI. "Notes on morphology and distribution of Acmanthera (A. Juss.) Griseb. (Malpighiaceae), an endemic genus from Brazil." Phytotaxa 415, no. 4 (2019): 199–207. http://dx.doi.org/10.11646/phytotaxa.415.4.4.

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We present the amended description of the species Acmanthera minima and A. parviflora based on specimens collected in the Lower Negro River basin and the Serra do Aracá National Park, respectively, in the Amazonas State, Brazil. We also provide photographs, a distribution map, notes on conservation status and a key to all species of the genus Acmanthera. We report new records and range extension for Acmanthera latifolia and A. minima, previously known only for the Negro and Madeira River basins, respectively.

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Costa, Jamerson Souza da, Liange De Sousa Rodrigues, Mayra Rejane Moreira Mendonça, Maria Da Glória Gonçalves de Melo, and Maria Astrid Rocha Liberato. "Environmental diagnosis of the lower course of the Gigante river basin (Amazonas – Brazil)." Ciência e Natura 42 (November 5, 2020): e97. http://dx.doi.org/10.5902/2179460x40562.

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The watershed is a complex system that goes beyond the drainage network, involving all the ecosystem aspects within its limits. Despite the set of ecohydrological functions that its components play in the protection of water resources, especially the vegetal cover, hydrological systems are the ecosystems that suffer the most changes due to anthropic activities, notably when inserted in the urban environment. Thus, this work aimed to perform the environmental diagnosis of the lower course of the Gigante river basin, in Manaus-AM. We carried field visits, collecting and registering information a

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Dos Anjos, Helio Daniel Beltrão, Jansen Zuanon, Tony Marcos Porto Braga, and Keid Nolan Silva Sousa. "Fish, upper Purus River, state of Acre, Brazil." Check List 4, no. 2 (2008): 198. http://dx.doi.org/10.15560/4.2.198.

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The ichthyofauna of the headwaters of the main tributaries of the mighty Solimões/Amazonas River has been little studied. Considering the importance of those environments for the overall fish diversity in that river system, we surveyed the composition of the fish fauna of the upper portion of Purus River and two of its tributaries (Caeté and Macapá rivers), state of Acre, Brazil. The collections were done in November 2004, using a seine net and a set of gillnets of different mesh sizes. A total of 735 specimens belonging to 86 species and 28 families were collected. Eight species, Creagrutus o

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dos, Anjos Helio, Jansen Zuanon, Tony Braga, and Keid Sousa. "Fish, upper Purus River, state of Acre, Brazil." Check List 4, no. (2) (2008): 198–213. https://doi.org/10.15560/4.2.198.

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The ichthyofauna of the headwaters of the main tributaries of the mighty Solimões/Amazonas River has been little studied. Considering the importance of those environments for the overall fish diversity in that river system, we surveyed the composition of the fish fauna of the upper portion of Purus River and two of its tributaries (Caeté and Macapá rivers), state of Acre, Brazil. The collections were done in November 2004, using a seine net and a set of gillnets of different mesh sizes. A total of 735 specimens belonging to 86 species and 28 families were collected. Eight species, <em>Creagrut

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Paixão, Andrea de Carvalho, and Mônica Toledo-Piza. "Systematics of Lamontichthys Miranda-Ribeiro (Siluriformes: Loricariidae), with the description of two new species." Neotropical Ichthyology 7, no. 4 (2009): 519–68. http://dx.doi.org/10.1590/s1679-62252009000400002.

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The taxonomic revision of the genus Lamontichthys Miranda-Ribeiro, based on the examination of 164 specimens of different river drainages throughout the Amazon basin, revealed the presence of six species of which two are new. Lamontichthys filamentosus occurs in the upper and middle portions of the rio Amazonas basin; L. llanero in the río Orinoco basin; L. maracaibero in the lago Maracaibo basin; and L. stibaros in the upper río Amazonas basin. Lamontichthys avacanoeiro, new species, occurs in the upper rio Tocantins basin; and L. parakana, new species, in the lower rio Tocantins basin. The n

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BOGAN, SERGIO, and FEDERICO L. AGNOLIN. "First fossil of the Giant Armored Catfish Acanthicus (Siluriformes, Loricariidae) from the Late Miocene of Entre Ríos Province, Argentina." Zootaxa 4808, no. 3 (2020): 571–81. http://dx.doi.org/10.11646/zootaxa.4808.3.11.

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Loricariidae is a very diverse lineage of Neotropical fishes, being the most speciose family of the order Siluriformes. However, the loricariid fossil record is still very sparse. The aim of the present contribution is to describe in detail several bones belonging to the loricariid genus Acanthicus coming from late Miocene beds located at the Paraná River cliffs, Entre Ríos province, Argentina. Fishes of the Acanthicus clade are currently restricted to the northern half of South America, being mainly distributed in the Orinoco and Amazonas basins, with a single genus reaching the Paraná-Plata

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Gaem, Paulo Henrique, Francisco Farroñay, Talitha Ferreira Santos, Nicolli Bruna Cabello, Fiorella Fernanda Mazine, and Alberto Vicentini. "First Record of Myrcia magna D.Legrand (Myrtaceae) as a Myrmecophyte Host for Myrcidris epicharis Ward, 1990 (Formicidae: Pseudomyrmecinae)." Sociobiology 66, no. 4 (2019): 592. http://dx.doi.org/10.13102/sociobiology.v66i4.4477.

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The association of the ant Myrcidris epicharis with the plant Myrcia magna is reported for the first time. This association was registered in two localities along the Negro river basin, in the region of Manaus, Amazonas state, Brazil. The ants inhabit swollen shoots in apical and subjacent nodes of the branches. This record represents the second plant species of Myrtaceae to be associated with Myrcidris epicharis.

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Lourenço, Igor Hister, Larissa Sbeghen Pelegrini, Victoria Judith Isaac Nahum, and Marcelo Rodrigues dos Anjos. "Analysis of Migratory Catfish Production from Artisanal Fishing in the Middle Madeira Sub-Basin Using New Monitoring Methods, Southwestern Amazon." Journal of Applied Ichthyology 2024 (February 23, 2024): 1–14. http://dx.doi.org/10.1155/2024/6668857.

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Studies on the production of Pimelodidae catfish in the Amazon are generally carried out in large fishing centers. However, the data referring to small-scale fisheries have gaps that can represent a risk to the activity. This study evaluated the volume produced and the revenue obtained from migratory catfish of the Pimelodidae family of commercial interest landed in Humaitá, Amazonas, Brazil, from May 2018 to April 2019. Daily monitoring was carried out with the Z-31 Fishermen’s Colony through questionnaires to fishermen for each vessel docked. The total production was 6013.93 kg, with 1,689 f

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Thomé-Souza, Mario J. F., Michael J. Maceina, Bruce R. Forsberg, Bruce G. Marshall, and Álvaro L. Carvalho. "Peacock bass mortality associated with catch-and-release sport fishing in the Negro River, Amazonas State, Brazil." Acta Amazonica 44, no. 4 (2014): 527–32. http://dx.doi.org/10.1590/1809-4392201400193.

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Sport fishing for peacock bass Cichla spp. in the Brazilian Amazon has increased in popularity and attracts anglers who generate significant economic benefits in rural regions. The sustainability of this fishery is partly dependent on the survival of fish caught through catch-and-release fishing. The objective of this work was to investigate, hooking mortality of Cichla spp., including speckled peacock bass (C. temensis Humbolt), butterfly peacock bass (C. orinocensis Humbolt), and popoca peacock bass (C. monoculus Agassiz) in the basin of the Negro River, the largest tributary of the Amazon R

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Ferraz, ESB, and EAN Fernandes. "Trace element composition in sediments of the Amazonian Lake Cristalino." Marine and Freshwater Research 46, no. 1 (1995): 107. http://dx.doi.org/10.1071/mf9950107.

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Lake Cristalino is a small lake adjacent to the Negro River near Manaus (03�08'S, 60�06'W) and not far from the Arnazonas River, in the central Amazon basin. The lake is fed seasonally by waters of the Negro River, a blackwater river with low levels of nutrients and suspended solids (7 g m-3). However, some investigations have established that Lake Cristalino has a high sedimentation rate (0.4-0.5 cm year-1) similar to those in the alluvial floodplain lakes of the Arnazonas River (suspended solids 200-300 g m-3). Sediment cores were taken during the low-water period and the trace-element compo

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MONTAÑA, CARMEN G., HERNÁN LÓPEZ-FERNÁNDEZ, and DONALD C. TAPHORN. "A new species of Crenicichla (Perciformes: Cichlidae) from the Ventuari River, Upper Orinoco River Basin, Amazonas State, Venezuela." Zootaxa 1856, no. 1 (2008): 33. http://dx.doi.org/10.11646/zootaxa.1856.1.3.

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We describe a new species of the genus Crenicichla Heckel, 1840, from the Ventuari River, a tributary of the Orinoco River in southern Venezuela. Crenicichla zebrina is distinguished from all other species in the genus by its unique coloration pattern, including the combination of a large, dark, vertically oriented, more or less oval-shaped humeral spot, and thin, dark bars, separated by narrow, vertical, yellowish bars extending between the dorsal and anal fin base on the caudal half of the body. Crenicichla zebrina is included in the putative C. acutirostris group (9 species) and represents

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Costa, Wilson, Pedro Amorim, and Pedro H. N. Bragança. "A new miniature killifish of the genus Melanorivulus (Cyprinodontiformes: Rivulidae) from the Xingu river drainage, Brazilian Amazon." Vertebrate Zoology 64, no. 2 (2014): 193–97. http://dx.doi.org/10.3897/vz.64.e31479.

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Melanorivulus rubroreticulatus, new species, is described on the basis of material collected in the lower section of the Xingu river drainage, Brazilian Amazon. It is a member of a group endemic to the region encompassing the southern Amazonas river tributaries and the Parnaíba river basin. The new species is distinguished from other congeners of this group by the presence of broad red bars on the caudal fin in males, bars often interconnected to form reticulations, and short red bars contrasting with intense light blue ground colour on the anal-fin base. It represents the northern-most record

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Costa, Wilson, Pedro Amorim, and Pedro H. N. Bragança. "A new miniature killifish of the genus Melanorivulus (Cyprinodontiformes: Rivulidae) from the Xingu river drainage, Brazilian Amazon." Vertebrate Zoology 64 (July 15, 2014): 193–97. https://doi.org/10.3897/vz.64.e31479.

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Melanorivulus rubroreticulatus, new species, is described on the basis of material collected in the lower section of the Xingu river drainage, Brazilian Amazon. It is a member of a group endemic to the region encompassing the southern Amazonas river tributaries and the Parnaíba river basin. The new species is distinguished from other congeners of this group by the presence of broad red bars on the caudal fin in males, bars often interconnected to form reticulations, and short red bars contrasting with intense light blue ground colour on the anal-fin base. It represents the northern-most record

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Gomes, Maria Fernanda S., Paulo Henrique R. Aride, Maiko Willas S. Ribeiro, et al. "Occurrence of Four Freshwater Stingrays (Chondrichthyes: Potamotrygoninae) in the Uatumã River Basin, Amazon Region: A Field Study." Fishes 9, no. 5 (2024): 186. http://dx.doi.org/10.3390/fishes9050186.

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The Amazon region has the largest diversity of freshwater stingrays; however, there are still places where information about this group is scarce. The present work aims to record the occurrence of freshwater stingrays in the Uatumã river basin, Amazonas, Brazil. For this, collections were carried out in three municipalities bathed by the Uatumã River, Presidente Figueiredo, Itapiranga, and São Sebastião do Uatumã. The rays were collected through fishing using a hand net and, after capture, were identified through the pattern of the dorsal and ventral color of the disc, the absence or presence

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Aguiar, Rogério Souza, Edson José Paulino da Rocha, José Augusto de Souza Junior, Joyse Tatiane Souza dos Santos, and Josiane Sarmento Dos Santos. "Análise de Componente do Regime Hidrológico da Bacia do Rio Amazonas em Anos de Eventos Climáticos." Revista Brasileira de Geografia Física 12, no. 3 (2019): 988. http://dx.doi.org/10.26848/rbgf.v12.3.p988-1002.

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As cheias e vazantes do rio Amazonas passaram a ser mais persistentes ao longo dos anos. Este estudo busca analisara influência da variabilidade temporal em escala de bacia hidrográfica sobre o regime do rio Amazonas, a partir das vazões da estação hidrológica da Agência Nacional de Águas – ANA, localizada em Óbidos, no Estado do Pará em uma série histórica de janeiro/1970 a dezembro/2013. Além do tempo, o estudo analisou a intensidade do El Niño e La Niña. Como esperado, o tempo influenciou na vazão média interanual encontrada de 98.723 m3/s para os 44 anos da série analisada. Porém com varia

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Martinez, Juliana F., Roberto L. Lui, Josiane B. Traldi, Daniel R. Blanco, and Orlando Moreira-Filho. "Comparative Cytogenetics of Hoplerythrinus unitaeniatus (Agassiz, 1829) (Characiformes, Erythrinidae) Species Complex from Different Brazilian Hydrographic Basins." Cytogenetic and Genome Research 149, no. 3 (2016): 191–200. http://dx.doi.org/10.1159/000448153.

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Chromosomal characteristics of Hoplerythrinus unitaeniatus populations from 5 Brazilian river basins, namely Arinos (Amazonas basin), Araguaia, Paraguai, Alto Paraná, and São Francisco were analyzed by conventional Giemsa staining, C-banding, silver nitrate impregnation, and fluorescence in situ hybridization (FISH) with 18S and 5S rDNA and telomeric sequence (TTAGGG)n probes. The diploid chromosome number was 2n = 48 in representatives of the populations from Paraguai and Alto Paraná River basins and 2n = 52 for those from the Arinos and Araguaia River basins. The São Francisco population had

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MENDES, Anderson C., Ângela B. DANTAS, Anne Caroline S. RIBEIRO, et al. "Provenance of heavy and clay minerals in bottom sediments of Green Lake, an Amazonian fluvial lake in Brazil." Acta Amazonica 50, no. 2 (2020): 159–69. http://dx.doi.org/10.1590/1809-4392201804681.

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ABSTRACT Studies on provenance of minerals in Amazonian rivers focus mostly on suspended sediments, while processes that control bottom-sediment production and distribution are still little known. We determined the provenance of the bottom sediments of Green Lake, a micro-basin draining into the Tapajós River, in the eastern Brazilian Amazon. We used X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and, cathodoluminescence techniques to analyze clay, light and heavy minerals of 22 samples. The lake is L-shaped, with 5.5 m maximu

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