Results 21 to 30 of about 212 (139)

Combined effects of life‐history traits and human impact on extinction risk of freshwater megafauna

Conservation Biology, Volume 35, Issue 2, Page 643-653, April 2021., 2021
Abstract Megafauna species are intrinsically vulnerable to human impact. Freshwater megafauna (i.e., freshwater animals ≥30 kg, including fishes, mammals, reptiles, and amphibians) are subject to intensive and increasing threats. Thirty‐four species are listed as critically endangered on the International Union for Conservation of Nature (IUCN).
Fengzhi He, Simone D. Langhans, Christiane Zarfl, Roland Wanke, Klement Tockner, Sonja C. Jähnig   +5 more
wiley   +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

Mitochondrial DNA suggests Hybridization in Freshwater Stingrays Potamotrygon (POTAMOTRYGONIDAE: MYLIOBATIFORMES) from the Xingu river, Amazonia and reveals speciation in Paratrygon aireba

Anais da Academia Brasileira de Ciências, 2021
In the Xingu river basin, Brazil, occurs two genera of Potamotrygonidae family: Potamotrygon and Paratrygon. In this region, the taxa have significant economic importance for the ornamental fishing industry, being intensively captured, especially the ...
DAMIRES SANCHES, THAIS MARTINS, ÍTALO LUTZ, IVANA VENEZA, RAIMUNDO DA SILVA, FELIPE ARAÚJO, JANICE MURIEL-CUNHA, IRACILDA SAMPAIO, MAGALI GARCIA, LEANDRO SOUSA, GRAZIELLE EVANGELISTA-GOMES   +10 more
doaj   +1 more source

Not just shades of grey: life is full of colour for the ocellate river stingray (Potamotrygon motoro) [PDF]

Journal of Experimental Biology, 2021
ABSTRACTPrevious studies have shown that marine stingrays have the anatomical and physiological basis for colour vision, with cone spectral sensitivity in the blue to green range of the visible spectrum. Behavioural studies on Glaucostegus typus also showed that blue and grey can be perceived and discriminated.
Vera Schluessel, Ingolf P. Rick, Friederike Donata Seifert, Christina Baumann, Wayne Iwan Lee Davies   +4 more
openaire   +2 more sources

Digenea, Nematoda, Cestoda, and Acanthocephala, parasites in Potamotrygonidae (Chondrichthyes) from the upper Paraná River floodplain, states of Paraná and Mato Grosso do Sul, Brazil [PDF]

Check List, 2008
The present paper represents the first study on the endoparasitic fauna of Potamotrygon falkneri and P. motoro in the upper Paraná River floodplain. Fishes were collected by fishing rod and gillnetting in different stations of the floodplain, from March,
Ana Lacerda, Ricardo Takemoto, Gilberto Pavanelli   +2 more
doaj   +5 more sources

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

Hábitos alimentares e sobreposição trófica das raias Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae) na planície alagável do alto rio Paraná, Brasil - DOI: 10.4025/actascibiolsci.v28i3.208

Acta Scientiarum: Biological Sciences, 2007
As raias Potamotrygon falkneri e Potamotrygon motoro foram avaliadas em relação à composição de suas dietas e a sobreposição do nicho trófico nos períodos de seca (agosto/2004) e cheia (janeiro/2005) na planície alagável do alto rio Paraná, em três ...
Alessandra Pasian Lonardoni, Erivelto Goulart, Edson Fontes de Oliveira, Milza Celi Fedatto Abelha   +3 more
doaj   +1 more source

Morfometria de raias continentais (Chondrichthyes, Potamotrygonidae) do alto rio Paraná, Brasil - DOI: 10.4025/actascibiolsci.v29i4.885

Acta Scientiarum: Biological Sciences, 2008
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   +1 more source

Morphology and morphometry of blood cells of two species of freshwater stingrays (Chondrichthyes: Potamotrygoninae) from the lower Solimões river, Amazon [PDF]

Anais da Academia Brasileira de Ciências
Cytomorphological evaluation of peripheral blood provides information about the health status of animals, in addition to being indicators of environmental contamination.
MARCIO QUARA DE C. SANTOS, FLÁVIA DAYANE F. FARIAS, PAULO HENRIQUE R. ARIDE, ADRIANO T. OLIVEIRA   +3 more
doaj   +1 more source

Potamotrygon motoro

, 2013
Potamotrygon motoro (Müller & Henle, 1841) Figs. 1-20, 21 b-c, 22 Synonymy of Potamotrygon motoro in the Paraná-Paraguay basin: Taeniura motoro: - Müller & Henle, 1841: 197-198 [original description, type locality: Cuiabá River, Brazil (“Fluss Cuyaba in Brasilien ”, p. 197)]; - Günther, 1870: 484 [brief description, synonymy].
Loboda, Thiago Silva, Carvalho, Marcelo Rodrigues de   +1 more
openaire   +2 more sources