71 results match your criteria orinoco basins


Phylogeography, genetic diversity and population structure of the freshwater stingray, (Müller & Henle, 1841) (Myliobatiformes: Potamotrygonidae) in the Colombian Amazon and Orinoco basins.

Mitochondrial DNA A DNA Mapp Seq Anal 2021 01 21;32(1):20-33. Epub 2020 Dec 21.

Laboratorio de Ecología Molecular de Vertebrados Acuáticos (LEMVA), Departamento de Ciencias Biológicas, Universidad de los Andes, Bogotá, Colombia.

The freshwater stingray have coloration, osteological and morphometric variations that could suggest the existence of more than one species in Colombia. In order to evaluate the phylogeography, population structure and genetic diversity for distributed in the Amazon and Orinoco basins, we amplified partial region of mitochondrial DNA () in 50 samples from eight different sub-basins. Our results suggest three phylogroups and a vicariance event occurred 43 million years ago proposing how diverged into the basins. Read More

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January 2021

Ecological impacts of an invasive top predator fish across South America.

Sci Total Environ 2021 Mar 4;761:143296. Epub 2020 Nov 4.

Graduate Course in Neotropical Biodiversity, Federal University of Rio de Janeiro State, Av. Pasteur, 458 - R506A, 22290-240 Rio de Janeiro, RJ, Brazil.

Peacock bass Cichla ocellaris is a piscivorous cichlid native from the Amazon and Orinoco river basins, which has been broadly introduced into tropical areas worldwide, leading to several adverse local effects. However, predictors of its invasibility and assessments of its ecological impacts over large spatial scales are still lacking. The importance of different environmental factors in explaining the relative abundance of peacock bass in 62 sites across South America (30 native and 32 invaded systems) was investigated. Read More

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Taxonomic study of Moenkhausia cotinho Eigenmann, 1908 and Hemigrammus newboldi (Fernández-Yépez, 1949) with the description of two new species of Moenkhausia (Teleostei: Characiformes: Characidae).

Zootaxa 2020 Sep 14;4852(1):zootaxa.4852.1.1. Epub 2020 Sep 14.

Universidade de São Paulo, Instituto de Biociências, Departamento de Zoologia, Rua do Matão, Travessa 14, no. 101, São Paulo, SP, CEP 05508-090, Brazil..

Moenkhausia cotinho is redescribed based on the examination of meristic and morphometric data and external morphological characters of specimens from the Amazon and Orinoco basins and from rivers in the Guyana. The species is distinguished from congeners based on the combination of a reticulate color pattern, the presence of dark spots on the posterior edge of scales of the longitudinal rows dorsal to the lateral line, the presence of a dark blotch on the caudal-fin base failing to reach the posterior tip of the middle caudal-fin rays; the dorsal region of the eyes red to orange in life; 5/3 longitudinal series of scales, above and below the lateral line, respectively; and the tips of the pectoral-fin rays not extending beyond the base of the pelvic fin. All specimens of M. Read More

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September 2020

A new species of Mastiglanis Bockmann 1994 (Siluriformes: Heptapteridae) from the Amazon River basin, Peru.

Zootaxa 2020 Jul 28;4820(2):zootaxa.4820.2.6. Epub 2020 Jul 28.

Departamento de Ictiología, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, ​Av. Arenales 1256, Jesús María, Lima, Perú. Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Programa de Pós-Graduação em Biologia Animal Av. Bento Gonçalves, 9500, Bloco IV, Prédio 43433, Campus do Vale, Bairro Agronomia, Porto Alegre, RS, Brasil..

Mastiglanis is a genus of heptapterid catfish represented by two valid species. These freshwater species are widely distributed along the Amazon, Orinoco, and Maroni River basins. However, a taxonomic review of specimens collected in the Putumayo and Nanay rivers, Amazon River basin in Peru revealed a new species of Mastiglanis. Read More

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First fossil of the Giant Armored Catfish Acanthicus (Siluriformes, Loricariidae) from the Late Miocene of Entre Ríos Province, Argentina.

Zootaxa 2020 Jul 3;4808(3):zootaxa.4808.3.11. Epub 2020 Jul 3.

Fundación de Historia Natural "Félix de Azara". Centro de Ciencias Naturales, Ambientales y Antropológicas, Universidad Maimónides, Hidalgo 775 piso 7 (1405BDB). Buenos Aires, Argentina..

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. Read More

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Molecular delimitation and taxonomic revision of the wimple piranha Catoprion (Characiformes: Serrasalmidae) with the description of a new species.

J Fish Biol 2020 Sep 22;97(3):668-685. Epub 2020 Jul 22.

Departamento de Biologia Estrutural e Funcional, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil.

A taxonomic revision of wimple piranhas of the genus Catoprion is performed in combination with a molecular analysis using mtDNA. Molecular phylogenetic analyses of 49 specimens using genetic distances, conventional likelihood and four delimitation methods yielded two distinct lineages of Catoprion, with the morphological analyses of 198 specimens of Catoprion corroborating the molecular results. We provide a redescription of Catoprion mento, from the Paraguay, Orinoco, and tributaries of western Amazon basin, keeping Mylesinus macropterus as a junior synonym of C. Read More

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September 2020

How will farmed populations of freshwater fish deal with the extreme climate scenario in 2100? Transcriptional responses of Colossoma macropomum from two Brazilian climate regions.

J Therm Biol 2020 Apr 13;89:102487. Epub 2020 Mar 13.

Laboratory of Ecophysiology and Molecular Evolution, Brazilian National Institute for Research of the Amazon, André Araújo Avenue, 2936, 69067-375, Petrópolis, Manaus, AM, Brazil.

Tambaqui (Colossoma macropomum Cuvier, 1818) is an endemic fish of the Amazon and Orinoco basins, and it is the most economically important native species in Brazil being raised in five climatically distinct regions. In the face of current global warming, environmental variations in farm ponds represent additional challenges that may drive new adaptive regional genetic variations among broodstocks of tambaqui. In an experimental context based on the high-emission scenario of the 5th Intergovernmental Panel on Climate Change (IPCC) report, we used two farmed tambaqui populations to test this hypothesis. Read More

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Genomic analyses reveal two species of the matamata (Testudines: Chelidae: Chelus spp.) and clarify their phylogeography.

Mol Phylogenet Evol 2020 07 9;148:106823. Epub 2020 Apr 9.

Museum of Zoology, Senckenberg Dresden, A. B. Meyer Building, Dresden, Germany.

The matamata is one of the most charismatic turtles on earth, widely distributed in northern South America. Debates have occurred over whether or not there should be two subspecies or species recognized due to its geographic variation in morphology. Even though the matamata is universally known, its natural history, conservation status and biogeography are largely unexplored. Read More

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Hyphessobrycon rheophilus, a new species from rapids of the Amazon and Orinoco river basins (Characiformes: Characidae: Stethaprioninae).

Zootaxa 2019 Dec 23;4712(4):zootaxa.4712.4.5. Epub 2019 Dec 23.

Universidade Federal de Rondônia, Departamento de Engenharia de Pesca, rua da Paz, 4376, Lino Alves Teixeira, 76916-000, Presidente Medici, RO, Brazil..

A new species from rapids of Rio Aripuanã, Rio Madeira basin, in Brazil, and from the same type of habitat in the upper Rio Negro and upper Rio Orinoco basins in Brazil, Colombia, and Venezuela is described and assigned to the genus Hyphessobrycon. The new species presents an interrupted lateral line plus a single perforated scale on caudal peduncle and a small dark blotch on dorsal procurrent caudal-fin rays, features not found in the other species of Hyphessobrycon. Comments on the phylogenetic position of the new species, its rheophilic habits, and the biogeographic implications of its distribution are presented. Read More

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December 2019

Taxonomic revision of the genus Anostomoides (Characiformes: Anostomidae).

Zootaxa 2019 Jul 23;4646(1):zootaxa.4646.1.7. Epub 2019 Jul 23.

Programa de Pós-Graduação em Ciências Biológicas, Universidade Estadual de Londrina, Centro de Ciências Biológicas, Rodovia Celso Garcia Cid, Campus Universitário, 86057-970, Londrina-PR, Brazil..

A taxonomic revision of Anostomoides is herein presented based on a comprehensive revision of specimens deposited in fish collections and the literature. The present revision proposes that A. laticeps is a junior synonym of A. Read More

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Mercury in Populations of River Dolphins of the Amazon and Orinoco Basins.

Ecohealth 2019 12 12;16(4):743-758. Epub 2019 Nov 12.

Grupo de Ecología del Paisaje y Modelación de Ecosistemas-ECOLMOD, Departamento de Biología, Facultad de Ciencias, Universidad Nacional de Colombia, Cra 30 No. 45-03, Bogotá, DC, Colombia.

In the Amazon and Orinoco basins, mercury has been released from artisanal and industrial gold mining since the Colonial time, as well as a result of deforestation and burning of primary forest, that release natural deposits of methyl mercury, affecting the local aquatic vertebrate fauna. This study reports the presence of mercury in river dolphins' genera Inia and Sotalia. Mercury concentrations were analysed in muscle tissue samples collected from 46 individuals at the Arauca and Orinoco Rivers (Colombia), the Amazon River (Colombia), a tributary of the Itenez River (Bolivia) and from the Tapajos River (Brazil). Read More

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December 2019

Checklist of the ichthyofauna of the Rio Negro basin in the Brazilian Amazon.

Zookeys 2019 17;881:53-89. Epub 2019 Oct 17.

Instituto Nacional de Pesquisas da Amazônia - INPA; Coordenação de Biodiversidade; Av. André Araújo, 2936, Caixa Postal 478, CEP 69067-375, Manaus, Amazonas, Brazil Instituto Nacional de Pesquisas da Amazônia Manaus Brazil.

This study presents an extensive review of published and unpublished occurrence records of fish species in the Rio Negro drainage system within the Brazilian territory. The data was gathered from two main sources: 1) litterature compilations of species occurrence records, including original descriptions and revisionary studies; and 2) specimens verification at the INPA fish collection. The results reveal a rich and diversified ichthyofauna, with 1,165 species distributed in 17 orders (+ two incertae sedis), 56 families, and 389 genera. Read More

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October 2019

Ayahuasca: Uses, Phytochemical and Biological Activities.

Nat Prod Bioprospect 2019 Aug 27;9(4):251-265. Epub 2019 May 27.

Laboratorio de Farmacología. Dpto. Ciencias de la Salud. Div. C.B.S. Universidad Autónoma Metropolitana, Unidad Iztapalapa. Av. San Rafael Atlixco No. 186, Col. Vicentina, 09340, Mexico CDMX, Mexico.

Ayahuasca (caapi, yajé), is a psychoactive brew from the Amazon Basin region of South America traditionally considered a "master plant." It is prepared as a decoction from Banisteriopsis caapi and Psychotria viridis, which it is thought that it stimulates creative thinking and visual creativity. Native healers of the Orinoco and Amazon basins have used traditionally ayahuasca as a healing tool for multiple purposes, particularly to treat psychological disorders in the patients, with some beneficial effects experimentally and clinically validated. Read More

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Molecular Data Reveal Multiple Lineages in Piranhas of the Genus (Teleostei, Characiformes).

Genes (Basel) 2019 05 15;10(5). Epub 2019 May 15.

Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista, Rua Professor Doutor Antônio Celso Wagner Zanin, 250, Rubião Junior, Botucatu, SP 18618-689, Brazil.

Carnivorous piranhas are distributed in four serrasalmid genera including which inhabit major river basins of South America. While and are endemics of the Orinoco and São Francisco basins, respectively, is widely distributed across the Amazonas, Essequibo, lower Paraná, Paraguay, and coastal rivers of northeastern Brazil, with recent records of introductions in Asia. Few studies have focused on the genetic diversity and systematics of and the putative presence of additional species within has never been the subject of a detailed molecular study. Read More

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A new species of Piaractus (Characiformes: Serrasalmidae) from the Orinoco Basin with a redescription of Piaractus brachypomus.

J Fish Biol 2019 Aug 22;95(2):411-427. Epub 2019 May 22.

Departamento de Genética, Instituto de Ciências Biológicas, Laboratório de Evolução e Genética Animal, Universidade Federal do Amazonas, Manaus, Brazil.

Piaractus orinoquensis, a new species of serrasalmid fish, is described from the Orinoco River basin. The new species differs from congeners by having a slenderer body, relatively smaller head and snout, more compressed mid-body, fewer scales above and below the lateral line and diagnostic molecular characters in the coI mitochondrial gene region. We also provide a re-description of Piaractus brachypomus, restricting its geographic distribution to the Amazon River basin. Read More

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Review of Ancistrus (Siluriformes: Loricariidae) from the northwestern Guiana Shield, Orinoco Andes, and adjacent basins with description of six new species.

Zootaxa 2019 Feb 6;4552(1):1-67. Epub 2019 Feb 6.

Field Museum of Natural History, 1400 S. Lake Shore, Chicago, IL 60605 USA.

The Orinoco Andes and northwestern Guiana Shield (Essequibo, Orinoco, Branco, and upper Negro) were found to contain 11 species of Ancistrus, six of which are new. We additionally examine A. brevifilis from the Río Tuy of Venezuela and A. Read More

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February 2019

Blood parasites infecting the Hoatzin (), a unique neotropical folivorous bird.

PeerJ 2019 5;7:e6361. Epub 2019 Feb 5.

Department of Biology/Institute for Genomics and Evolutionary Medicine (iGEM), Temple University, Philadelphia, PA, United States of America.

The Hoatzin () is the only extant member of the order Opisthocomiformes. This unique South American bird lives in the riparian lowland vegetation characteristic of the Amazon and Orinoco basins. Hoatzins nest in communal social units close to water bodies; they are strictly folivores being the only bird with pregastric fermentation in the crop. Read More

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February 2019

Mitochondrial DNA diversity and population structure of the ocellate freshwater stingray Potamotrygon motoro (Müller & Henle, 1841) (Myliobatiformes: Potamotrygonidae) in the Colombian Amazon and Orinoco Basins.

Mitochondrial DNA A DNA Mapp Seq Anal 2019 04 7;30(3):466-473. Epub 2019 Jan 7.

a Laboratorio de Ecología Molecular de Vertebrados Acuáticos (LEMVA), Departamento de Ciencias Biológicas , Universidad de los Andes , Bogotá , Colombia.

The lack of clarity regarding the taxonomy of the ocellate river stingray (Potamotrygon motoro) and the absence of previous studies regarding its genetic diversity and population structure makes this species vulnerable to overexploitation, being now the second species of freshwater ray most extracted and exported for ornamental purposes in Colombia. The aim of this work was to determine the population genetic structure and genetic diversity of P. motoro in the Colombian Amazon and Orinoco basins. Read More

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Red-headed Amazon River Turtles in Venezuela and Colombia: population separation and connection along the famous route of Alexander von Humboldt.

Zoology (Jena) 2018 10 17;130:67-78. Epub 2018 Jul 17.

Grupo Biodiversidad y Conservación Genética, Instituto de Genética, Universidad Nacional de Colombia, Ciudad Universitaria, Edificio 426, Bogotá, Colombia; Museum of Zoology, Senckenberg Natural History Collections of Dresden, Königsbrücker Landstraße 159, D-01109 Dresden, Germany. Electronic address:

Podocnemis erythrocephala, the Red-headed Amazon River Turtle, is distributed in the Amazon and Orinoco basins where it predominantly inhabits blackwater and has never been found in whitewater. The only permanent river connection between the habitats in the different river basins features considerable whitewater proportions and, therefore, is hypothesised to be a dispersal barrier for this turtle species. By using variable neutral nuclear and mitochondrial markers (microsatellite loci and control region sequences), the present study assessed the genetic structure, genetic diversity, gene flow and historical biogeography of P. Read More

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October 2018

Rivers shape population genetic structure in (Arecaceae).

Ecol Evol 2018 Jul 11;8(13):6589-6598. Epub 2018 Jun 11.

Laboratorio Nacional de Genómica para la Biodiversidad (Langebio) Unidad de Genómica Avanzada Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Irapuato Guanajuato Mexico.

The L.f. palm is known as the "tree of life" given its importance as fundamental food and construction resources for humans. Read More

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Taxonomic revision of the Cis-Andean species of Mylossoma Eigenmann Kennedy, 1903 (Teleostei: Characiformes: Serrasalmidae).

Zootaxa 2018 Feb 26;4387(2):275-309. Epub 2018 Feb 26.

Universidade Estadual Paulista, Departamento de Morfologia, Laboratório de Biologia e Genética de Peixes. Distrito de Rubião Júnior S/N, 18618-970 Botucatu, SP, Brazil..

A revision of the cis-Andean species of Mylossoma is presented. Four species were recognized: M. albiscopum and M. Read More

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February 2018

Redescription of Dekeyseria picta (Siluriformes; Loricariidae), a poorly known ancistrin from the Amazon and Orinoco Basins.

J Fish Biol 2018 May 26;92(5):1446-1462. Epub 2018 Mar 26.

Instituto Nacional de Pesquisas da Amazônia (INPA), Programa de Coleções, Coleção de Peixes, Campus II. Av. Andre Araujo, 2936, Petrópolis, CEP 69067-375, Manaus, Amazonas, Brazil.

A re-evaluation of Dekeyseria brachyura and D. pulchra found them to be junior synonyms of D. picta, the oldest species among these congeners, based on continuous intraspecific variation in morphometrics and colour pattern. Read More

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Fishes of the Cusiana River (Meta River basin, Colombia), with an identification key to its species.

Zookeys 2018 26(733):65-97. Epub 2018 Jan 26.

Laboratorio de Ictiología, Unidad de Ecología y Sistemática (UNESIS), Departamento de Biología, Facultad de Ciencias, Pontificia Universidad Javeriana, Carrera 7 N° 43-82, Bogotá, D.C., Colombia.

The Cusiana River sub-basin has been identified as a priority conservation area in the Orinoco region in Colombia due to its high species diversity. This study presents an updated checklist and identification key for fishes of the Cusiana River sub-basin. The checklist was assembled through direct examination of specimens deposited in the main Colombian ichthyological collections. Read More

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January 2018

Systematics and diversification of Anindobothrium Marques, Brooks & Lasso, 2001 (Eucestoda: Rhinebothriidea).

PLoS One 2017 27;12(9):e0184632. Epub 2017 Sep 27.

Departamento de Zoologia/Instituto de Biociências, Universidade de São Paulo, São Paulo, São Paulo, Brazil.

Tapeworms of the genus Anindobothrium Marques, Brooks & Lasso, 2001 are found in both marine and Neotropical freshwater stingrays of the family Potamotrygonidae. The patterns of host association within the genus support the most recent hypothesis about the history of diversification of potamotrygonids, which suggests that the ancestor of freshwater lineages of the Potamotrygonidae colonized South American river systems through marine incursion events. Despite the relevance of the genus Anindobothrium to understand the history of colonization and diversification of potamotrygonids, no additional efforts were done to better investigate the phylogenetic relationship of this taxon with other lineages of cestodes since its erection. Read More

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October 2017

Taxonomic review of Copella (Characiformes: Lebiasinidae) with an identification key for the species.

PLoS One 2017 17;12(8):e0183069. Epub 2017 Aug 17.

Museu de Zoologia da Universidade de São Paulo, Ipiranga, São Paulo, São Paulo, Brazil.

A taxonomic review of Copella is presented based on the analysis of the type material of all nominal species and extensive material from South American drainages. Six out of ten nominal species are recognized as valid: Copella arnoldi, C. callolepis, C. Read More

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October 2017

Molecular analysis reveals hidden diversity in Zungaro (Siluriformes: Pimelodidade): a genus of giant South American catfish.

Genetica 2017 Jun 13;145(3):335-340. Epub 2017 May 13.

Laboratório de Biodiversidade Molecular e Conservação, Departamento de Genética e Evolução, Universidade Federal de São Carlos, Rodovia Washington Luis km 235, 13565-905, São Carlos, SP, Brazil.

The genus Zungaro contains some of the largest catfish in South America. Two valid species are currently recognized: Zungaro jahu, inhabiting the Paraná and Paraguay basins, and Zungaro zungaro, occurring in the Amazonas and Orinoco basins. Analysing Zungaro specimens from the Amazonas, Orinoco, Paraguay and Paraná basins, based on the sequencing of COI and D-loop, we found at least three MOTUs, indicating the existence of hidden diversity within this fish group. Read More

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The Karyotype of Microsternarchus aff. bilineatus: A First Case of Y Chromosome Degeneration in Gymnotiformes.

Zebrafish 2017 06 6;14(3):244-250. Epub 2017 Mar 6.

1 Laboratório de Citogenética , Centro de Estudos Avançados da Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Brazil .

Various species and lineages that until recently were identified as Microsternarchus bilineatus (Hypopomidae, Gymnotiformes) have a widespread distribution in the Amazon and Orinoco River basins and across the Guiana shield. Recent molecular studies show five distinct lineages for Microsternarchus from different localities. These results suggest that this previously monotypic genus actually consists of more than one species. Read More

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Large-scale SNP discovery and construction of a high-density genetic map of Colossoma macropomum through genotyping-by-sequencing.

Sci Rep 2017 04 7;7:46112. Epub 2017 Apr 7.

Animal Science department, University of São Paulo (USP)/Luiz de Queiroz College of Agriculture (ESALQ), Piracicaba, São Paulo, Brazil.

Colossoma macropomum, or tambaqui, is the largest native Characiform species found in the Amazon and Orinoco river basins, yet few resources for genetic studies and the genetic improvement of tambaqui exist. In this study, we identified a large number of single-nucleotide polymorphisms (SNPs) for tambaqui and constructed a high-resolution genetic linkage map from a full-sib family of 124 individuals and their parents using the genotyping by sequencing method. In all, 68,584 SNPs were initially identified using minimum minor allele frequency (MAF) of 5%. Read More

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On the importance of geographic and taxonomic sampling in phylogeography: A reevaluation of diversification and species limits in a Neotropical thrush (Aves, Turdidae).

Mol Phylogenet Evol 2017 06 24;111:87-97. Epub 2017 Mar 24.

Laboratorio de Biología Evolutiva de Vertebrados, Departamento de Ciencias Biológicas, Universidad de los Andes, Bogotá, Colombia.

Phylogeographic studies seeking to describe biogeographic patterns, infer evolutionary processes, and revise species-level classification should properly characterize the distribution ranges of study species, and thoroughly sample genetic variation across taxa and geography. This is particularly necessary for widely distributed organisms occurring in complex landscapes, such as the Neotropical region. Here, we clarify the geographic range and revisit the phylogeography of the Black-billed Thrush (Turdus ignobilis), a common passerine bird from lowland tropical South America, whose evolutionary relationships and species limits were recently evaluated employing phylogeographic analyses based on partial knowledge of its distribution and incomplete sampling of populations. Read More

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Specific gravity of woody tissue from lowland Neotropical plants: differences among forest types.

Ecology 2017 May 7;98(5):1474. Epub 2017 Apr 7.

Laboratorio de Ecología de Bosques Tropicales y Primatología, Universidad de Los Andes, 111711, Bogotá D.C, Colombia.

Wood density, or more precisely, wood specific gravity, is an important parameter when estimating aboveground biomass, which has become a central tool for the management and conservation of forests around the world. When using biomass allometric equations for tropical forests, researchers are often required to assume phylogenetic trait conservatism, which allows us to assign genus- and family-level wood specific gravity mean values, to many woody species. The lack of information on this trait for many Neotropical plant species has led to an imprecise estimation of the biomass stored in Neotropical forests. Read More

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