Results 71 to 80 of about 414 (162)

Morfometria de raias continentais (Chondrichthyes, Potamotrygonidae) do alto rio Paraná, Brasil = Morphometry of upper Paraná river freshwater stingrays (Chondrichthyes, Potamotrygonidae)

Acta Scientiarum: Biological Sciences, 2007
Potamotrygonidae constitui o único grupo recente de Chondrichthyes cujo habitat está restrito, exclusivamente, a águas continentais. Na planície de inundação do Alto rio Paraná, espécies desta família estabeleceram-se após o fechamento das comportas da ...
Antonio Guilherme Cândido da Silva, Erivelto Goulart   +1 more
doaj  

Ecotoxicology of Potamotrygoninae freshwater stingrays: bioaccumulation, toxicological risks, and conservation implications

Frontiers in Marine Science
Obligate freshwater stingrays of the Potamotrygoninae subfamily are endemic to South America and confined to freshwater systems heavily impacted by anthropogenic activities. These pressures often lead to habitat degradation, with unknown impacts on these
Neuciane Dias Barbosa, Neuciane Dias Barbosa, Natascha Wosnick, Natascha Wosnick, Natascha Wosnick, Ana Paula Chaves, Eloísa Pinheiro Giareta, Renata Daldin Leite, Patricia Charvet, Rachel Ann Hauser-Davis   +9 more
doaj   +1 more source

Fish distribution across altitudinal gradients in the Upper Paraguay River Basin: Implications for conservation in the Pantanal region

Conservation Science and Practice, Volume 7, Issue 7, July 2025.
This paper approaches the patterns in fish distribution across the altitudinal gradient in the Upper Paraguay River basin, from uplands to the floodplain. We compiled more than 75,000 available fish records and registered 342 fish species and your distribution along altitudinal gradient. Floodplain portion have higher species diversity than headwaters,
Adriana Maria Espinoza Fernando, Francisco Severo‐Neto, Fabiane Silva Ferreira, Lúcia Mateus, Karina K. Tondato‐Carvalho, Elaine Antoniassi Luiz Kashiwaqui, Heriberto Gimenes Junior, Wladimir M. Domingues, Carla Simone Pavanelli, Henrique Ledo Lopes Pinho, Jerry Penha, Yzel Rondon Súarez   +11 more
wiley   +1 more source

Diet of the freshwater stingray Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) on Marajó Island (Pará, Brazil) Dieta da raia de água doce Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) na Ilha de Marajó (Pará, Brasil)

Brazilian Journal of Biology, 2010
The stomach contents of 137 examples of Potamotrygon motoro caught in 3 locations (Muaná, Afuá and Lake Arari) on Marajó Island were analysed. The values of the Index of Relative Importance (IRI) and its respective percentage (%IRI) were calculated.
MP. Almeida, PMO. Lins, P. Charvet-Almeida, RB. Barthem   +3 more
doaj   +1 more source

Potamotrygon amandae Loboda, Carvalho 2013

, 2018
Published as part of Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, pp. 1-111 in Neotropical Ichthyology 16 (2) on pages 15-16, DOI: 10.1590/1982-0224-20170094, http://zenodo.org/record ...
Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da, Pavanelli, Carla Simone   +3 more
openaire   +2 more sources

Stirring, charging, and picking: hunting tactics of potamotrygonid rays in the upper Paraná River

Neotropical Ichthyology
Hunting tactics of potamotrygonid freshwater rays remain unreported under natural conditions. Three main foraging tactics of Potamotrygon falkneri and P. motoro are described here based on underwater observations in the upper Paraná River.
Domingos Garrone-Neto, Ivan Sazima
doaj   +1 more source

Machine learning models accurately predict clades of proteocephalidean tapeworms (Onchoproteocephalidea) based on host and biogeographical data

Cladistics, Volume 41, Issue 3, Page 264-282, June 2025.
Abstract Proteocephalids are a cosmopolitan and diverse group of tapeworms (Cestoda) that have colonized vertebrate hosts in freshwater and terrestrial environments. Despite the ubiquity of the group, key macroevolutionary processes that have driven the group's evolution have yet to be identified.
Philippe Vieira Alves, Reinaldo José da Silva, Tomáš Scholz, Alain de Chambrier, José Luis Luque, Anastasiia Duchenko, Daniel Janies, Denis Jacob Machado   +7 more
wiley   +1 more source

Allometric patterns in Potamotrygon motoro (Myliobatiformes: Potamotrygonidae): insights into sexual and ontogenetic variation

Neotropical Ichthyology
Potamotrygon is the most species-rich genus of Neotropical freshwater stingrays in the Potamotrygoninae, currently comprising 31 species primarily diagnosed by coloration patterns, dermal denticles, and body measurements. Although morphometric characters
Júlia Papalardo Azevedo, Thiago Silva Loboda, Veronica Slobodian   +2 more
doaj   +1 more source

Potamotrygon schroederi Fernandez-Yepez 1958

, 2011
Published as part of De, Marcelo R., Sabaj, Mark H. & Lovejoy, Nathan R., 2011, Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yépez, 1958 (Chondrichthyes: Potamotrygonidae), pp.
De, Marcelo R., Sabaj, Mark H., Lovejoy, Nathan R.   +2 more
openaire   +1 more source

Potamotrygon limai Fontenelle, Silva & Carvalho 2014

, 2023
Potamotrygon limai Fontenelle, Silva & Carvalho, 2014 Holotype: MZUSP 104031; adult male, 477 mm DW (cited as 498 mm DW in Fontenelle et al. 2014) (Fig. 13); Represa Samuel, district of Itapo ã do Oeste, Rio Madeira basin, Rio Jamari, Amazon basin, Rondônia State, Brazil, 9º4’33.96’’S, 63º18’17.64’’W; depth not listed; F. P. L. Marques et al.; May 2006.
Lima, Arthur De, Loboda, Thiago Silva, Gianeti, Michel Donato, Silva, João Paulo Capretz Batista Da, Pinna, Mario De   +4 more
openaire   +2 more sources