Results 61 to 70 of about 996 (161)

Ecophysiological interactions and water-related physicochemical parameters among freshwater stingrays

Brazilian Journal of Biology
The objective of this study was to compare and correlate the ecology of neonates and young individuals of Potamotrygon wallacei, Potamotrygon motoro and Paratrygon aiereba with regard to their hematological profile and the physicochemical parameters of ...
A. T. Oliveira, M. L. G. Araújo, J. R. G. Lemos, M. Q. C. Santos, J. Pantoja-Lima, P. H. R. Aride, M. Tavares-Dias, J. L. Marcon   +7 more
doaj   +1 more source

Beyond Hard Parts: Metabarcoding Advances Dietary Resolution in Threatened Amazonian Elasmobranchs

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 5, May 2026.
ABSTRACT Elasmobranchs are highly vulnerable and are considered one of the most threatened vertebrates worldwide. Insights into diet can improve conservation measures. The bias of traditional morphological methods towards taxa with distinctive hard parts makes metabarcoding analysis a complementary tool to assess diet composition. Here, we analysed the
Alan Érik S. Rodrigues, Cintia Oliveira Carvalho, Jorge Luiz S. Nunes, Rafaela Maria S. Brito, Marcelo Ândrade, Carolina Oliveira Magalhães, Fabrício dos Anjos Santa Rosa, Audun Schrøder‐Nielsen, Hugo J. de Boer, Quentin Mauvisseau, Jonathan S. Ready, João Bráullio L. Sales   +11 more
wiley   +1 more source

Análises transcritômicas do ferrão de Potamotrygon falkneri e Potamotrygon motoro [PDF]

, 2014
Dissertação (mestrado)—Fundação Universidade de Brasília, Programa de Pós-Graduação em Biologia Animal, 2014.Potamotrygon falkneri e Potamotrygon motoro consistem em espécies de arraias da família Potamotrygonidae.
Oliveira Júnior, Nelson Gomes de
core  

Sperm motility and lipid composition in internally fertilizing ocellate river stingray Potamotrygon motoro

Theriogenology, 2019
All extant groups of Elasmobranches have internal fertilization and the structure of the male reproductive organs is very specific: sperm passes from the internal organs via the cloaca, but the male copulating organ (clasper) is distant from the cloaca. This suggests that sperm can contact the surrounding medium before fertilization.
Dzyuba, Viktoriya, Sampels, Sabine, Ninhaus-Silveira, Alexandre, Kahanec, Martin, Verissimo-Silveira, Rosicleire, Rodina, Marek, Cosson, Jacky, Boryshpolets, Sergii, Selinger, Martin, Sterba, Jan, Dzyuba, Borys   +10 more
openaire   +4 more sources

Potamotrygon motoro gestacion

, 2017
Hembra adulta de potamotrygon motoro en estado de gestaciónFaunaVichadaLaboratorio Fundación OrinoquíaLaboratorio de pecesRaya motoroPotamotrygon motoroAnimaliaChordataChondrichthyesMyliobatiformesPotamotrygonidaePotamotrygonPuerto ...
Novoa Serna, María del Rosario
core   +1 more source

A new species of freshwater stingray (Myliobatiformes: Potamotrygoninae) from northern South America

Neotropical Ichthyology
A new species of freshwater stingray (Potamotrygoninae) is described from the Demerara River, Guyana and río Guanare, Venezuela. It is distinguished from all other regional congeneric taxa (i.e., Potamotrygon marinae, P. schroederi, P.
Devya Hemraj-Naraine, João Pedro Fontenelle, Astrid Acosta-Santos, Nathan R. Lovejoy, Elford Liverpool, Matthew A. Kolmann   +5 more
doaj   +1 more source

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   +2 more sources

Serum chemistry, thyroxine concentration, and blood cell morphology of wild, young Blackchin Guitarfish Glaucostegus cemiculus sampled on the eastern Mediterranean coastline

Journal of Aquatic Animal Health, Volume 36, Issue 3, Page 281-299, September 2024.
Abstract Objective The Blackchin Guitarfish Glaucostegus cemiculus is endemic to the Mediterranean Sea and is critically endangered, but relevant routine laboratory data are unavailable. Our objectives were to determine the packed cell volume (PCV), comprehensive serum chemistry analytes, and serum total thyroxine (sTT4) concentration; compare serum ...
Nevo Schwartz, Danny Morick, Barak Azrieli, Aviad Scheinin, Dan Tchernov, Itamar Aroch   +5 more
wiley   +1 more source

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  

Shearing overbite and asymmetrical jaw motions facilitate food breakdown in a freshwater stingray, Potamotrygon motoro [PDF]

Journal of Experimental Biology, 2019
ABSTRACT Many species of fish process their prey with cyclic jaw motions that grossly resemble those seen in mammalian mastication, despite starkly different tooth and jaw morphologies. The degree of similarity between the processing behaviors of these disparate taxa has implications for our understanding of convergence in vertebrate ...
J. D. Laurence-Chasen, Jason B. Ramsay, Elizabeth L. Brainerd   +2 more
openaire   +2 more sources