Results 31 to 40 of about 996 (161)

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   +2 more sources

Case Reports of Citrobacter freundii Infections in Captive Freshwater Species in South Korea [PDF]

Pathogens
Citrobacter freundii, an opportunistic Gram-negative bacterium belonging to the Enterobacteriaceae family, is emerging as a significant pathogen in diverse aquatic species, often associated with environmental stress and poor husbandry conditions.
Su-Bhin Jeong, Bo Seong Kim, Min-Young Sohn, Ha-Jeong Son, Chae-Yeong Ji, Ji Hye Jin, Gyoungsik Kang, Chan-Il Park   +7 more
doaj   +2 more sources

The ancient and helical architecture of Elasmobranchii's spermatozoa enables progressive motility in viscous environments. [PDF]

PLoS ONE
Subclass 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, Borys Dzyuba, Pablo García-Salinas, Hermes Bloomfield-Gadêlha, Victor Gallego, Anatoliy Sotnikov, Juan F Asturiano   +6 more
doaj   +2 more sources

Descriptions of two new freshwater Neotropical species of Rhinebothrium (Cestoda: Rhinebothriidea) from Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) [PDF]

Folia Parasitologica, 2011
Two new species of Rhinebothrium (Cestoda, Rhinebothriidea) from potamotrygonid stingrays in the Neotropical region are herein described, which raises the total number of Rhinebothrium species known from Neotropical freshwaters to five.
Ivanov, V.A., Menoret, A.
core   +8 more sources

First identification of interspecies hybridization in the freshwater stingrays Potamotrygon motoro and P-falkneri (Myliobatiformes, Potamotrygonidae)

Conservation Genetics, 2015
The stingrays Potamotrygon motoro and P. falkneri occurred in sympatry in the Paraguay, Lower and Middle Parana River, and belong to distinct ecomorphological groups.
Cruz, V. P. [UNESP], Mendonça, F. F. [UNESP], Foresti, F., Pardo, B. G., Martinez, P., Oliveira, C. [UNESP], Oliveira, C., Vera, M., Foresti, F. [UNESP], Cruz, V. P., Mendonça, F. F.   +10 more
core   +3 more sources

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, Xi-Dong, Mu, Min-Xia, Wei, Xue-Jie, Wang, Jian-Ren, Luo, Yin-Chang, Hu   +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, Todd J. McWhorter, Shangzhe Xie, Tiara Sophia Binte Mohd Nasir, Borja Reh, Eduardo J. Fernandez   +5 more
wiley   +1 more source

Conservation threats and future prospects for the freshwater fishes of Ecuador: A hotspot of Neotropical fish diversity

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, Gabriela Alvarez‐Mieles, Fernando Anaguano‐Yancha, Ricardo Burgos Morán, Roberto V. Cucalón, Daniel Escobar‐Camacho, Iván Jácome‐Negrete, Pedro Jiménez Prado, Enrique Laaz, Katherin Miranda‐Troya, Ronald Navarrete‐Amaya, Fredy Nugra Salazar, Willan Revelo, Juan F. Rivadeneira, Jonathan Valdiviezo Rivera, Edwin Zárate Hugo   +15 more
wiley   +1 more source

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