Results 161 to 170 of about 1,538 (201)

First identification of interspecies hybridization in the freshwater stingrays Potamotrygon motoro and P. falkneri (Myliobatiformes, Potamotrygonidae)

Conservation Genetics, 2015
The stingrays Potamotrygon motoro and P. falkneri occurred in sympatry in the Paraguay, Lower and Middle Parana River, and belong to distinct ecomorphological groups. The construction of a hydroelectric dam in Itaipu in 1982 facilitated the invasion of Upper Parana River by both species with unpredictable ecological consequences. The aim of the present
V. P. Cruz, M. Vera, F. F. Mendonça, B. Pardo, P. Martinez, C. Oliveira, F. Foresti   +6 more
semanticscholar   +3 more sources

Potamotrygon motoro

2014
Published as part of Litz, Thomas O. & The, Stefan Koerber Introduction, 2014, Check List of the Freshwater Fishes of Uruguay (CLOFF-UY)., pp.
Litz, Thomas O., The, Stefan Koerber Introduction   +1 more
openaire   +1 more source

PRESUMPTIVE DYSGERMINOMA IN AN ORANGE-SPOT FRESHWATER STINGRAY (POTAMOTRYGON MOTORO)

Journal of Zoo and Wildlife Medicine, 2015
A captive-born, 13-yr-old female orange-spot freshwater stingray, (Potamotrygon motoro), presented with an acute caudodorsal swelling. Ultrasonography revealed an intracoelomic mass of mixed echogenicity containing fluid pockets. The ray was euthanatized and gross postmortem examination confirmed the presence of a fluid-filled coelomic mass in the ...
Yousuf S, Jafarey, Ric A, Berlinski, Christopher S, Hanley, Michael M, Garner, Matti, Kiupel   +4 more
openaire   +2 more sources

Seeing the forest before the trees-spatial orientation in freshwater stingrays (Potamotrygon motoro) in a hole-board task.

Behavioural Processes, 2015
Freshwater stingrays (Potamotrygon motoro) have been shown to use a variety of spatial learning strategies including directional, landmark and place learning. In the present study, the significance of landmarks and geometric cues was investigated in a hole-board task.
V. Schluessel, H. Herzog, M. Scherpenstein   +2 more
semanticscholar   +3 more sources

Envenomation by Amazonian freshwater stingray Potamotrygon motoro: 2 cases reported in Europe

Toxicon, 2006
Freshwater stingrays of the Potamotrygon genus are regarded by native people in the Amazonia as dangerous fishes responsible of frequent stings. Small freshwater stingrays are imported to Europe and sold as aquarium fish because they are easy to keep captive.
Ingrid Blanc, Brisset, Andreas, Schaper, Philip, Pommier, Luc, de Haro   +3 more
openaire   +2 more sources

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. Part A, DNA mapping, sequencing, and analysis, 2019
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 ...
Mariana Renza-Millán, C. Lasso, Mónica A Morales-Betancourt, F. Villa, S. Caballero   +4 more
semanticscholar   +1 more source

An intriguing model for 5S rDNA sequences dispersion in the genome of freshwater stingray Potamotrygon motoro (Chondrichthyes: Potamotrygonidae)

Molecular Biology, 2015
5S rDNA genes of the stingray Potamotrygon motoro were PCR replicated, purified, cloned and sequenced. Two distinct classes of segments of different sizes were obtained. The smallest, with 342 bp units, was classified as class I, and the largest, with 1900 bp units, was designated as class II.
V. P. Cruz, C. Oliveira, F. Foresti
semanticscholar   +4 more sources

Potamotrygon motoro

Potamotrygon motoro (Müller & Henle 1841) Distribution tropical S. A., east of Andes. Notes Barriga (1994), Galacatos et al. (2004), Valdiviezo-Rivera et al. (2018), Jácome-Negrete et al. (2018).
Escobar-Camacho, Daniel, Valdiviezo-Rivera, Jonathan, Carrillo-Moreno, Carolina, Argüello, Pablo, Swing, Kelly   +4 more
openaire   +1 more source

Reproduction and development of the South American freshwater stingrays,Potamotrygon circularis and P. motoro

Environmental Biology of Fishes, 1983
Observations of reproductive features and body measurements were made on wild-caught, freshwater stingrays, Potamotrygon circularis and P. motoro, from the Amazon drainage of western Brazil and southern Colombia. Further observations were made in Detroit's Belle Isle Aquarium on a captive pair of P.
Thomas B. Thorson, James K. Langhammer, Madeline I. Oetinger   +2 more
openaire   +1 more source

Characterization of cDNAs encoding cholesterol side chain cleavage and 3β-hydroxysteroid dehydrogenase in the freshwater stingray Potamotrygon motoro

Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 2006
The interrenal gland (adrenocortical homolog) of elasmobranchs produces a unique steroid, 1alpha-hydroxycorticosterone (1alpha-B). The synthesis of this and most other steroids requires both cholesterol side chain cleavage (CYP11A) and 3beta-hydroxysteroid dehydrogenase (HSD3).
Scott Nunez, B., Evans, A.N., Simpson, M.A., Wong, W.P., Ip, Y.K.   +4 more
openaire   +2 more sources