Results 41 to 50 of about 1,299 (195)
Journal of Fish Biology, Volume 108, Issue 3, Page 922-931, March 2026.Abstract The branchial epithelium of Potamotrygon—a member of the only strictly freshwater elasmobranch family Potamotrygonidae—was observed via immunohistochemistry, and two distinct forms of ionocytes were identified. The acid (A‐type) and base (B‐type) secreting cells with respective basolateral–apical localizations of Na+/K+‐ATPase–Na+/H+ exchanger
M. W. Rossi +3 more
wiley +1 more source
Revista U.D.C.A Actualidad & Divulgación Científica, 2011 A pesar de la representatividad de Potamotrygon magdalenae en Colombia, por encontrarse a lo largo de la cuenca del río Magdalena y sus afluentes, esta raya no ha sido objeto de estudios previos, desconociéndose la mayor parte de sus aspectos bio ...
Herly Bibiana Ramos Socha +1 more
doaj +1 more source
Ictiólogos de la Argentina: Guillermo Martínez Achenbach. [PDF]
, 2009 This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina. The general plan of this work consists of individual factsheets containing a list of works
López, Hugo L. +2 more
core
SERUM COMPOSITION OF FRESHWATER STRINGRAYS (POTAMOTRYGONIDAE) ADAPTED TO FRESH AND DILUTE SEA WATER
The Biological Bulletin, 1973 1. Juvenile freshwater stingrays of the family Potamotrygonidae are unable to survive in salinities in excess of 20.6‰ when gradually acclimated.2. No differences were observed in blood pH or hematological parameters when fish adapted to a salinity of 14.5‰ were compared with freshwater controls.3. Significant increases were found in serum sodium (21%),
Griffith, Robert W +3 more
openaire +2 more sources
Ornamental fishing in the region of Barcelos, Amazonas: socioeconomic description and scenario of activity in the view of “piabeiros” [PDF]
Brazilian Journal of Biology, 2019 The Negro river basin is considered the largest area of extractive of ornamental fish in Brazil. This area has fundamental importance for the populations from the Amazon.
D. S. Ladislau +9 more
doaj +1 more source
Diversidad gen?tica de potamotrygon motoro en las cuencas del Onrin?co y Amazonas colombiano [PDF]
, 2017 61 p. Recurso Electr?nicoLa falta de claridad frente a la taxonom?a de Potamotrygon motoro y la ausencia de estudios previos de su diversidad gen?tica, hace a la especie vulnerable al ser la segunda especie de raya de agua dulce m?s extra?da y exportada ...
Renza Mill?n, Mariana
core
Acta Biológica Colombiana, 2021 El diseño de cebadores es fundamental para amplificar regiones de genes debido a que la especificidad que mantienen cebador-secuencia de interés puede causar el éxito o fracaso en la reacción de PCR.
Iván Yesid López-Ardila +2 more
doaj +1 more source
Fish fauna from Río Pilcomayo National Park and Ramsar Site and its surroundings, Formosa, Argentina [PDF]
, 2014 The first list of fish species from the Río Pilcomayo National Park and Ramsar Site (RPNP), located in the WetChaco plains of Northern Argentina is presented here.
Baigún, Claudio Rafael M. +5 more
core +4 more sources
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 +3 more
doaj +1 more source
Spatiotemporal eDNA Monitoring of Marine Biodiversity in a Hyperurbanised Coastal Environment
Environmental DNA, Volume 7, Issue 4, July–August 2025.Using environmental DNA and a metabarcoding approach, we amplified and sequenced the cytochrome oxidase subunit I (COI) gene for invertebrates and the 16S rRNA gene for vertebrates. Our spatiotemporal analyses over a year and across four sites in Singapore revealed distinct communities between sites and timepoints for both the COI and 16S rRNA assays ...
Zhi Ting Yip +2 more
wiley +1 more source