Results 21 to 30 of about 3,578 (213)

First record of plastic ingestion by a freshwater stingray

Science of The Total Environment, 2023
The abundance and dispersion of plastic particles in aquatic ecosystems has become pervasive resulting in the incorporation of these materials into food webs. Here we describe the first record of plastic ingestion by the freshwater white-blotched river stingray Potamotrygon leopoldi (Potamotrygonidae), an endemic and threatened species in the Xingu ...
Trindade, Paulo A A, Brabo, Lúcio D M, Andrades, Ryan, Azevedo-Santos, Valter M, Andrade, Marcelo C, Candore, Laura, Cabigliera, Serena B, Chelazzi, David, Cincinelli, Alessandra, Jeffres, Carson A, Giarrizzo, Tommaso   +10 more
openaire   +3 more sources

Sperm Lipid Composition in Early Diverged Fish Species: Internal vs. External Mode of Fertilization

Biomolecules, 2020
The lipid composition of sperm membranes is crucial for fertilization and differs among species. As the evolution of internal fertilization modes in fishes is not understood, a comparative study of the sperm lipid composition in freshwater ...
Kathrin M. Engel, Viktoriya Dzyuba, Alexandre Ninhaus-Silveira, Rosicleire Veríssimo-Silveira, Dirk Dannenberger, Jürgen Schiller, Christoph Steinbach, Borys Dzyuba   +7 more
doaj   +1 more source

Environmental DNA approach complements social media reports to detect an endangered freshwater stingray species in the wild

Endangered Species Research, 2022
Environmental DNA (eDNA) barcoding has emerged as an important non-invasive sampling technique for the detection of rare and endangered species that can be difficult to sample.
KC Lim, AY Then
doaj   +1 more source

Morphological aspects and germ cells of male reproductive tract of river stingray, Potamotrygon amandae

Acta Scientiarum: Biological Sciences, 2023
The family Potamotrygonidae are the only species of stingrays restricted to fresh water and located exclusively in South America. The objective of this research was to analyze the morphological aspects and germ cells of the male reproductive tract of ...
Stefhani Cristina Chan Jacik, Julia Bastos de Aquino, Luana Felix de Melo, Rosângela Felipe Rodrigues, Alan Peres Feraz de Melo, Maria Angélica Miglino, Rose Eli Grassi Rici   +6 more
doaj   +1 more source

Electroreception in the obligate freshwater stingray, Potamotrygon motoro [PDF]

Marine and Freshwater Research, 2015
Elasmobranch fishes use electroreception to detect electric fields in the environment, particularly minute bioelectric fields of potential prey. A single family of obligate freshwater stingrays, Potamotrygonidae, endemic to the Amazon River, demonstrates morphological adaptations of their electrosensory system due to characteristics of a high impedance
Lindsay L. Harris, Christine N. Bedore, Stephen M. Kajiura   +2 more
openaire   +1 more source

A Severe Accident Caused by an Ocellate River Stingray (Potamotrygon motoro) in Central Brazil: How Well Do We Really Understand Stingray Venom Chemistry, Envenomation, and Therapeutics?

Toxins, 2015
Freshwater stingrays cause many serious human injuries, but identification of the offending species is uncommon. The present case involved a large freshwater stingray, Potamotrygon motoro (Chondrichthyes: Potamotrygonidae), in the Araguaia River in ...
Nelson Jorge da Silva, Kalley Ricardo Clementino Ferreira, Raimundo Nonato Leite Pinto, Steven Douglas Aird   +3 more
doaj   +1 more source

Ecophysiological interactions and water-related physicochemical parameters among freshwater stingrays [PDF]

Brazilian Journal of Biology, 2016
Abstract 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 the water that they inhabit.
Oliveira, A. T., Araújo, M. L. G., Lemos, J. R. G., Santos, M. Q. C., Pantoja-Lima, J., Aride, P. H. R., Tavares-Dias, M., Marcon, J. L.   +7 more
openaire   +5 more sources

Functionally Rich Fish Assemblages Support Greater Rates of Multiple Ecological Functions in Seagrass Meadows. [PDF]

Ecol Evol
We show that the functional diversity of fishes promotes multifunctionality in seagrass meadows. We found that there was consistency in the seascape context and connectivity variables that structured the rate and distribution of different components of functioning and the functional diversity of fish in seagrass meadows.
James AL, Gilby BL, Olds AD, Mosman JD, Hill JT, Henderson CJ.   +5 more
europepmc   +2 more sources

The Influence of Body Size and Hemoglobin Multiplicity on Critical Oxygen Threshold in Red Drum (Sciaenops ocellatus) [PDF]

, 2016
Hypoxia is common in marine environments and fishes use a suite of cardiorespiratory adjustments to defend aerobic metabolism, including reducing standard metabolic rate (SMR), the minimum metabolic rate needed to sustain life at a specified temperature,
Pan, Yihang
core   +1 more source

Growth and reproduction in captivity unveils remarkable life-history plasticity in the smallnose fanskate, Sympterygia bonapartii (Chondrichthyes: Rajiformes) [PDF]

, 2018
Analizamos el crecimiento y la reproducción de ejemplares de raya marmorada, Sympterygia bonapartii nacidas en cautiverio. Se obtuvieron ovicápsulas a partir de la oviposición de dos hembras capturadas en la naturaleza y mantenidas en el Acuario Temaikèn.
Abraham, Carolina, Argemi, Federico, Jañez, Julieta, Lucifora, Luis Omar, Meijide, Fernando Javier   +4 more
core   +3 more sources