Results 11 to 20 of about 212 (139)
Complete mitochondrial genome of the river stingray Potamotrygon orbignyi (Myliobatiformes: Potamotrygonidae) [PDF]
Mitochondrial DNA. Part B. Resources, 2019 The river stingray Potamotrygon orbignyi is a carnivorous bottom feeder that is widespread in the Amazonian region. We here assemble the 17,449 bp complete mitochondrial genome of the species, showing a typical gene arrangement as for related ...
David Ory +5 more
doaj +2 more sources
[PROVISIONAL] Chromosomal characterization of Amazonian freshwater stingrays with evidence for new karyomorphs and XX/XY sex chromosomes [PDF]
Genetics and Molecular Biology, 2019 Cytogenetic studies in the subfamily Potamotrygoninae has already provided valuable insights into the understanding of the evolution and diversification of its species.
Francisco Carlos de Souza Valentim +2 more
doaj +2 more sources
Visual discrimination and resolution in freshwater stingrays (Potamotrygon motoro). [PDF]
J Comp Physiol A Neuroethol Sens Neural Behav Physiol, 2021 AbstractPotamotrygon motoro has been shown to use vision to orient in a laboratory setting and has been successfully trained in cognitive behavioral studies using visual stimuli. This study explores P. motoro’s visual discrimination abilities in the context of two-alternative forced-choice experiments, with a focus on shape and contrast, stimulus ...
Daniel MMM +3 more
europepmc +4 more sources
The ancient and helical architecture of Elasmobranchii's spermatozoa enables progressive motility in viscous environments. [PDF]
PLoS ONESubclass Elasmobranchii belongs to an old evolutionary class of Chondrichthyes that diverged 450 mya, presenting a wide diversity of reproductive strategies while preserving the ancient mode of internal fertilization.
Sergii Boryshpolets +6 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
Brazilian Journal of Biology, 2010 The stomach contents of 137 examples of Potamotrygon motoro caught in 3 locations (Muaná, Afuá and Lake Arari) on Marajó Island were analysed. The values of the Index of Relative Importance (IRI) and its respective percentage (%IRI) were calculated.
MP. Almeida +3 more
doaj +2 more sources
Acta Scientiarum: Biological Sciences, 2006 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 ...
Milza Celi Fedatto Abelha +3 more
doaj +1 more source
Complete mitochondrial genome of the ocellate river stingray (Potamotrygon motoro) [PDF]
Mitochondrial DNA, 2014 We determined the first complete mitochondrial genome sequence of Potamotrygon motoro from South American freshwater stingrays. The total length of P. motoro mitogenome is 17,448 bp, which consists of 13 protein-coding genes, 22 tRNA genes, 2 rRNA genes and a control region, with the genome organization and gene order being identical to that of the ...
Hong-Mei, Song +5 more
+7 more sources
A comparison of staff presence and signage on zoo visitor behavior
Zoo Biology, Volume 42, Issue 3, Page 407-415, May/June 2023., 2023 The presence of uniformed zoo staff reduced negative behaviors by zoo visitors more effectively than signage. Abstract Many zoos favor the use of signage to encourage learning and positive visitor experiences as well as discourage negative behaviors by visitors because of its simplicity, relatively low maintenance needed, and low cost. However, current
Claudia Tay +5 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