Results 51 to 60 of about 702 (125)

Tectonostratigraphic Evolution of the Guyana Basin: Implications for Sediment Routing and Slope Stability

Basin Research, Volume 38, Issue 2, March/April 2026.
Seismic profile across the Guyana Basin showing the main tectonostratigraphic units and an order‐of‐magnitude increase in sedimentation rates since the Middle Miocene corresponding with the onset of sedimentation dominated by mass transport deposits. ABSTRACT The Guyana Basin developed in an evolving tectonic setting, but a lack of subsurface data has ...
Deron Saul, Uisdean Nicholson
wiley   +1 more source

Patterns of Style, Diversity, and Similarity in Middle Orinoco Rock Art Assemblages

Arts, 2019
The area encompassed by the Orinoco river basin is home to some of the largest and most diverse rock art sites in lowland South America. In this paper, we aim to formally describe the spatial distribution and stylistic attributes of rock engravings and ...
Philip Riris, José Oliver
doaj   +1 more source

Ichthyofauna of piedmont and savannah environments in the Casanare River drainage, Orinoco Basin, Colombia

Biota Colombiana, 2018
Currently, only 20 fish species have been recorded from the Casanare River, which is one of the main tributaries of the Meta River drainage. To characterize the fish assemblages of this river, samplings were carried out at 35 collecting stations in low ...
Jhon Zamudio, Alexander Urbano-Bonilla, Vicente Preciado-Silva, Daniel Rodríguez-Cubillos, Edgar Esteban Herrera-Collazos   +4 more
doaj   +1 more source

Proposal of a non-lethal visual census method to estimate freshwater stingray abundance

Universitas Scientiarum, 2016
There is not a current method to estimate South American freshwater stingray’s abundance. Therefore we designed a census method and tested it in the field.
Mónica Andrea Morales-Betancourt, Carlos Andrés Lasso-Alcalá   +1 more
doaj   +1 more source

Lista preliminar de los peces del río Papunahua, cuenca del río Inírida - departamento del Vaupés, Colombia

Biota Colombiana, 2009
Fish sampling in the Papunahua river (Inírida river basin-colombian Orinoco) (october and november 2005) revealed 86 fish species grouped in 64 genera, 28 families, and 8 orders. Orders with the largest numbers of species were Characiformes (42 species),
Hollman Miller-Hurtado, Donald C. Taphorn B., José Saulo Usma Oviedo   +2 more
doaj   +1 more source

Composition and fish species richness in piedmont streams and rivers of the Cusiana River drainage in the Colombian Orinoco River Basin

Biota Colombiana, 2014
In order to provide information on the composition and richness of fish in the Colombian Orinoco piedmont (Tauramena - Casanare), collections were made every two months (June 2012 - February 2013), and standardized (arts-length-time), for six streams and
Alexander Urbano-Bonilla, Saúl Prada-Pedreros, Ángela Zapata, José I. Barrera-Cataño, Ana C. Moreno-Cárdenas   +4 more
doaj   +1 more source

Fishes of the Tomo river, Orinoco basin, Colombia

Biota Colombiana, 2006
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Javier Alejandro Maldonado-Ocampo, Miryan Lugo, Juan David Bogotá-Gregory, Carlos A. Lasso, Lucena Vásquez, Jose Saulo Usma, Donald C. Taphorn, Francisco Provenzano Rizzi   +7 more
doaj   +1 more source

Revision of the Astyanax orthodus species-group (Teleostei: Characidae) with descriptions of three new species

European Journal of Taxonomy, 2018
The Astyanax orthodus species-group includes nine species: Astyanax boliviensis sp. nov., A. bopiensis nom. nov., A. embera sp. nov., A. gandhiae sp. nov., A. moorii comb. nov., A. orthodus, A. superbus, A. villwocki and A. yariguies comb. nov. The group
Raquel I. Riuz-C, César Román-Valencia, Donald C. Taphorn, Paulo A. Buckup, Hernán Ortega   +4 more
doaj   +1 more source

Systematics and biogeography of Sternarchellini (Gymnotiformes: Apteronotidae): Diversification of electric fishes in large Amazonian rivers

Neotropical Ichthyology
The Sternarchellini (Gymnotiformes, Apteronotidae) is a clade of 10 electric fish species that inhabit deep river channels of the Amazon and Orinoco basins, attain moderate adult body sizes (15-50 cm TL), and have a predatory life style.
Stephen J. Ivanyisky III, James S. Albert   +1 more
doaj   +1 more source

Revision of the South American freshwater fish genus Laemolyta Cope, 1872 (Ostariophysi: Characiformes: Anostomidae)

Neotropical Ichthyology
The anostomid genus Laemolyta Cope, 1872, is redefined.Various morphological, especially osteological characters in addition to the commonly utilized features of dentition proved useful for its characterization.
Kelly Cristina Mautari, Naércio Aquino Menezes   +1 more
doaj   +1 more source