Distribution modelling for Neotropical freshwater stingrays Potamotrygon brachyura and Potamotrygon motoro (Myliobatiformes, Potamotrygonidae) in the Uruguay River basin. [PDF]
J Fish BiolAbstract This study aimed to identify geographical distribution patterns of the giant short‐tailed river stingray Potamotrygon brachyura and the motoro stingray Potamotrygon motoro in the Uruguay River basin. Data on presence/absence of stingrays were based on fishers' knowledge accessed by interviews through expeditions in Brazil, Argentina and ...
Pereira DAS, Reis RE, Fontoura NF.
europepmc +2 more sources
Testicular Morphology and Spermatogenesis in Potamotrygon motoro: Insights Into Reproduction of Freshwater Stingrays. [PDF]
J MorpholElectron microscopy of Potamotrygon motoro spermatozoa. a – Illustration of a schematic sperm cell depicting the helical head, intermediate piece (midpiece), and flagellum. b ‐ Helical heads (Hh) of spermatozoa inserted into the cytoplasm of Sertoli cells (S) through openings in the plasma membrane. Scales: 10 μm.
Delgado MLR +6 more
europepmc +2 more sources
Morphology of lateral line canals in Neotropical freshwater stingrays (Chondrichthyes: Potamotrygonidae) from Negro River, Brazilian Amazon [PDF]
Neotropical Ichthyology, 2010 The relationship between the distribution of the lateral line canals and their functionality has not been well examined in elasmobranchs, especially among Neotropical freshwater stingrays of the family Potamotrygonidae.
Akemi Shibuya +3 more
doaj +2 more sources
The use of pelvic fins for benthic locomotion during foraging behavior in Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) [PDF]
Zoologia (Curitiba), 2015 Synchronized bipedal movements of the pelvic fins provide propulsion (punting) during displacement on the substrate in batoids with benthic locomotion. In skates (Rajidae) this mechanism is mainly generated by the crural cartilages.
Akemi Shibuya +3 more
doaj +4 more sources
Analysis of the Entire Mitogenome of the Threatened Freshwater Stingray <i>Potamotrygon leopoldi</i> (Myliobatiformes: Potamotrygonidae) and Comprehensive Phylogenetic Assessment in the Xingu River, Brazilian Amazon. [PDF]
Int J Mol SciThe present study characterizes the complete mitochondrial genome of Potamotrygon leopoldi, commonly referred to as the “white blotched stingray”, a member of the Potamotrygonidae family that are a group of stingrays that live exclusively in ...
Guerreiro SLM +14 more
europepmc +2 more sources
Linking rivers, mixing faunas: How artificial connectivity between the Middle and Upper Paraná River basins shapes fish diversity in a tributary of the Itaipu Reservoir, Brazil. [PDF]
J Fish BiolAbstract This work aimed to investigate the distribution and occurrence of fish species along the São Francisco Falso Braço Norte (SFFBN) River basin, a tributary of the Middle Paraná River basin now artificially connected to the Upper Paraná ecoregion, to evaluate how such connectivity may affect the biogeographic distribution and regional composition
Kampfert LEP +5 more
europepmc +2 more sources
Evolution of reproductive modes in sharks and rays
Journal of Evolutionary Biology, Volume 36, Issue 11, Page 1630-1640, November 2023., 2023 The evolution of reproductive modes in sharks, rays, and chimaeras. Abstract The ecological and life history drivers of the diversification of reproductive modes in early vertebrates are not fully understood. Sharks, rays and chimaeras (group Chondrichthyes) have an unusually diverse variety of reproductive modes and are thus an ideal group to test the
Gergely Katona +7 more
wiley +1 more source
Comparing the performance of 12S mitochondrial primers for fish environmental DNA across ecosystems
Environmental DNA, Volume 3, Issue 6, Page 1113-1127, November 2021., 2021 We propose a framework for comparing the performance of primer pairs, which we applied to the comparison of two fish eDNA primer pairs, teleo and MiFish‐U. We showed how those primer pairs could be best used together to increase diversity coverage of eDNA studies.
Andrea Polanco F. +12 more
wiley +1 more source
Journal of Fish Biology, Volume 99, Issue 4, Page 1158-1189, October 2021., 2021 ABSTRACT Freshwater fish communities in Ecuador exhibit some of the highest levels of diversity and endemism in the Neotropics. Unfortunately, aquatic ecosystems in the country are under serious threat and conditions are deteriorating. In 2018–19, the government of Ecuador sponsored a series of workshops to examine the conservation status of Ecuador's ...
Windsor E. Aguirre +15 more
wiley +1 more source
Hematological parameters of freshwater stingrays from the lower river negro, Amazonas, Brazil [PDF]
Brazilian Journal of BiologyFreshwater stingrays of the subfamily Potamotrygoninae represent a unique group of elasmobranchs exclusively adapted to freshwater environments in South America.
R. M. Paixão +7 more
doaj +2 more sources