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Relevant bibliographies by topics / River stingray

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Academic literature on the topic 'River stingray'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "River stingray"

1

Oliveira, A. T., M. L. G. Araújo, J. Pantoja-Lima, P. H. R. Aride, M. Tavares-Dias, R. P. Brinn, and J. L. Marcon. "Cyrilia sp. (Apicomplexa: Haemogregarinidae) in the Amazonian freshwater stingray Potamotrygon wallacei (cururu stingray) in different hydrological phases of the Rio Negro." Brazilian Journal of Biology 77, no. 2 (August 15, 2016): 413–16. http://dx.doi.org/10.1590/1519-6984.00416.

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Abstract Intraerythrocytic parasites are frequently found in fish, including elasmobranchs. The Amazonian rivers present well defined annual hydrological cycles that results in drastic modifications of the environmental conditions with deep implications in the life cycle of the whole associated biota in those fluvial systems. The freshwater stingray Potamotrygon wallacei (stingray cururu) is a new species restricted to the Middle Rio Negro basin and it is subject to strong alterations in their natural habitats (igapós) a result of the constant variations in the water level of Rio Negro. This work demonstrates the occurrence of intraerythrocytic parasite Cyrilia sp. in this stingray species. Additionally, the prevalence and quantification of hemoparasites in different phases of Rio Negro were also established. Field sampling was carried in the Archipelago of Mariuá, Middle Rio Negro, involving different stages of the water cycle. The intraerythrocytic parasites were quantified by direct counting in blood smears using a total counting of 2000 erythrocytes in each blood smear. The presence of parasites intraerythrocytic generates changes in the morphology of blood cell. The largest amount of the hemoparasites was recorded in the drought period. We observed a decreasing tendency in the number of parasites in the blood between the drought periods and inundation. We concluded that the level of Negro River influences the incidence of intraerythrocytic parasites in the cururu stingray and the drought represents the period of larger susceptibility to the infestation.

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Carmo, Lucas, Alline Mota, and Cecilia Manoel. "Hemopneumothorax Caused By River Stingray Accident In The Amazon Region." Residência Pediátrica 8, no. 1 (April 2018): 51–54. http://dx.doi.org/10.25060/residpediatr-2018.v8n1-09.

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Song, Hong-Mei, Xi-Dong Mu, Min-Xia Wei, Xue-Jie Wang, Jian-Ren Luo, and Yin-Chang Hu. "Complete mitochondrial genome of the ocellate river stingray (Potamotrygon motoro)." Mitochondrial DNA 26, no. 6 (January 10, 2014): 857–58. http://dx.doi.org/10.3109/19401736.2013.861429.

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Morales-Betancourt, Mónica Andrea, and Carlos Andrés Lasso-Alcalá. "Proposal of a non-lethal visual census method to estimate freshwater stingray abundance." Universitas Scientiarum 21, no. 1 (February 10, 2016): 23. http://dx.doi.org/10.11144/javeriana.sc21-1.poan.

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<p>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. It consists of making nocturnal surveys by boat in large rivers (>25m width) and floodplain lagoons of varying sizes, along transects of 100m x 10m (1000 m2). We applied this method in the Tomo River, a tributary of the Orinoco River in Colombia. 110 transects were surveyed in 200 runs. A total of 149 rays of four species were recorded: <em>Potamotrygon motoro, Potamotrygon orbignyi, Potamotrygon schroederi</em> and <em>Paratrygon aiereba. P. motoro</em> was the most abundant with a density of 0.31 individuals /1000 m2 (SD=0.5). This method gave optimal results when applied to habitats with high transparency and shallow depth (< 1m) since it permitted the identification of both adults and juveniles present.</p>

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Ory, David, Yves Cuenot, Régis Vigouroux, Raphaël Covain, Sébastien Brosse, and Jérôme Murienne. "Complete mitochondrial genome of the river stingray Potamotrygon orbignyi (Myliobatiformes: Potamotrygonidae)." Mitochondrial DNA Part B 4, no. 2 (July 3, 2019): 3153–54. http://dx.doi.org/10.1080/23802359.2019.1666683.

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6

Frederico, Renata G., Izeni P. Farias, Maria Lúcia Góes de Araújo, Patricia Charvet-Almeida, and José A. Alves-Gomes. "Phylogeography and conservation genetics of the Amazonian freshwater stingray Paratrygon aiereba Müller & Henle, 1841 (Chondrichthyes: Potamotrygonidae)." Neotropical Ichthyology 10, no. 1 (2012): 71–80. http://dx.doi.org/10.1590/s1679-62252012000100007.

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The family Potamotrygonidae is monophyletic comprising three genera: Paratrygon Duméril, Potamotrygon Garman and Plesiotrygon Rosa, Castello & Thorson. The distribution of most species in this family is restricted to a single basin or fluvial system. Only Potamotrygon motoro, Potamotrygon orbignyi and Paratrygon aiereba are found in more than one river basin. In this study we investigate genetic structuring of Paratrygon aiereba, from five rivers of the Amazon region: Negro, Solimões-Amazon-Estuary system, Tapajós, Xingu and Araguaia. Sixty-three individuals were sequenced for ATPase 6, and a representative subsample of 27 individuals was sequenced for COI. The COI dataset analysis indicated that Paratrygon is sister to all other potamotrygonid genera and species. Population parameters inferred from the analysis of ATPase 6 sequences revealed that the populations of this species are structured within each river, with no or nearly non-existent gene flow occurring between rivers and a positive correlation between geographic and genetic distances. Paratrygon aiereba is comprised of three geographically restricted clades with K2P interclade distances of at least 2%. Intraspecific divergence within P. aiereba is similar to the interspecific divergence observed in Potamotrygon spp. sampled throughout the same geographic area. Using the premises of COI barcoding and the allopatric distribution of the three P. aiereba clades, the taxon P. aiereba most likely comprises three distinct biological species. Since freshwater stingrays of the family Potamotrygonidae are highly exploited for the aquarium trade, management and conservation strategies need to be implemented at the level of each river basin, rather than at the level of the Amazon basin.

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Seamone, S. G., T. M. McCaffrey, and D. A. Syme. "Disc starts: the pectoral disc of stingrays promotes omnidirectional fast starts across the substrate." Canadian Journal of Zoology 97, no. 7 (July 2019): 597–605. http://dx.doi.org/10.1139/cjz-2018-0054.

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We explored how the flattened and rounded pectoral disc of the ocellate river stingray (Potamotrygon motoro (Müller and Henle, 1841)) enables them to use the benthic plane during fast-start escape. Escape responses were elicited via prodding different locations around the pectoral disc and were recorded using video. Modulation of pectoral-fin movements that power swimming enabled omnidirectional escape across the substrate, with similar performance in all directions of escape. Hence, translation of the body did not necessarily have to follow the orientation of the head, overcoming the constraint of a rigid body axis. An increase in prod speed was associated with an increase in initial translational speed and acceleration away from the prod. As prod location shifted towards the snout, yaw rotation increased, eventually reorienting the fish into a forward swimming position away from the prod. Furthermore, P. motoro yawed with essentially zero turning radius, allowing reorientation of the head with simultaneous rapid translation away from the prod, and yaw rate during escape was substantially greater than reported during routine swimming for stingrays. We conclude that stingrays employ a distinctive approach to escape along the substrate, which we have termed disc starts, that results in effective manoeuvrability across the benthic environment despite limited longitudinal flexibility of the body and that challenges the concept of manoeuvrability typically used for fishes.

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Khovansky, Igor, and Elena Podorozhnyuk. "Pacific salmon fry migration in the Amur River basin." Fisheries 2021, no. 2 (April 9, 2021): 52–59. http://dx.doi.org/10.37663/0131-6184-2021-2-52-59.

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The intensity of the Pacific salmon fry migration in the Amur basin depends on the water level and floods; In the clear water of the river Anyuy rolled migration is round-the-clock, but the intensity of migration shifts to the dark time of day. In recent years, the effectiveness of reproduction is not stable, there are "failures" when the number of young people decreases dramatically, which determines the need for constant observations of the stingray for adjustments of catch forecasts. The assessment of the total number of young people sliding into the Amur River basin shows the comparability of the number of natural young and young produced by fish farms, and more research is needed to determine the role and contribution of artificial reproduction.

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Harris, Lindsay L., Christine N. Bedore, and Stephen M. Kajiura. "Electroreception in the obligate freshwater stingray, Potamotrygon motoro." Marine and Freshwater Research 66, no. 11 (2015): 1027. http://dx.doi.org/10.1071/mf14354.

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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 freshwater environment. Little work has investigated whether the reduced morphology translates to reduced sensitivity because of the electrical properties of freshwater, or because of a marine-tuned sensory system attempting to function in freshwater. The objective of the present study was to measure electric potential from prey of Potamotrygon motoro and replicate the measurements in a behavioural assay to quantify P. motoro electrosensitivity. Median orientation distance to prey-simulating electric fields was 2.73cm, and the median voltage gradient detected was 0.20mVcm–1. This sensitivity is greatly reduced compared with marine batoids. A euryhaline species with marine-type ampullary morphology was previously tested in freshwater and demonstrated reduced sensitivity compared with when it was tested in seawater (0.2μVcm–1 v. 0.6nVcm–1). When the data were adjusted with a modified ideal dipole equation, sensitivity was comparable to P. motoro. This suggests that the conductivity of the medium, more so than ampullary morphology, dictates the sensitivity of elasmobranch electroreception.

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Dzyuba, Viktoriya, Sabine Sampels, Alexandre Ninhaus-Silveira, Martin Kahanec, Rosicleire Veríssimo-Silveira, Marek Rodina, Jacky Cosson, et al. "Sperm motility and lipid composition in internally fertilizing ocellate river stingray Potamotrygon motoro." Theriogenology 130 (May 2019): 26–35. http://dx.doi.org/10.1016/j.theriogenology.2019.02.029.

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Dissertations / Theses on the topic "River stingray"

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Rincon, Filho Getulio. "Aspectos taxonômicos, alimentação e reprodução da raia de água doce Potamotrygon orbignyi (Castelnau) (Elasmobranchii: potamotrygonidae) no rio Paraná-Tocantins /." Rio Claro : [s.n.], 2006. http://hdl.handle.net/11449/106565.

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Rincon, Filho Getulio [UNESP]. "Aspectos taxonômicos, alimentação e reprodução da raia de água doce Potamotrygon orbignyi (Castelnau) (Elasmobranchii: potamotrygonidae) no rio Paraná-Tocantins." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/106565.

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Made available in DSpace on 2014-06-11T19:35:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-03-14Bitstream added on 2014-06-13T21:08:00Z : No. of bitstreams: 1 rinconfilho_g_dr_rcla.pdf: 2989756 bytes, checksum: 1a42dacb7997cea4ab2edc011dd589b3 (MD5)
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Whalen, John. "A Multibiomarker Analysis of Pollutant Effects on Atlantic Stingray Populations in Florida’s St. Johns River." UNF Digital Commons, 2017. http://digitalcommons.unf.edu/etd/725.

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The goal of this study was to examine the potential health effects of organochlorine (OC) and polycyclic aromatic hydrocarbon (PAH) exposure on Atlantic stingray populations in Florida’s St. Johns River (SJR). Special emphasis was placed on identifying OC- and/or PAH-related effects in stingrays from areas of the lower (LSJR) and middle (MSJR) basins shown to possess elevated levels of these compounds, as well as characterizing baseline levels of pollutant exposure in the SJR shipping channel, which may be subjected to dredging in the near future, potentially resuspending and redistributing contaminated sediments and increasing pollutant-associated effects. To accomplish this, we measured OC and PAH biomarker levels in stingrays collected from contaminated and reference sites. We specifically examined the phase I detoxification enzyme, cytochrome P4501a1 (CYP1a1); the phase II detoxification enzymes, glutathione-S-transferase (GST) and uridine 5’-diphosphate glucuronosyltransferase (UGT); fluorescent aromatic compounds, PAH bile metabolites; and lipid peroxidation (LPO), cell membrane damage. Biomarker values collected between 2014 and 2016 were compared by site. Detoxification enzyme activity and LPO values from individuals collected from the three MSJR lakes between 2002 and 2005 were compared to those collected between 2014 and 2016. The data suggested that biomarker values from the SJR were variable, with elevated levels from Lake Jesup. Compared to reference estuaries, the LSJR has low biomarker values. This indicates that residing in certain portions of the MSJR is detrimental to stingray health, while residing in the LSJR is not. Lake Monroe and Lake George biomarker levels indicated reduced contaminant input over time, whereas Lake Jesup biomarker levels suggested the opposite. This study has developed a baseline for biomarker levels in the LSJR, allowing for the identification of dredging-induced changes to the system, and has identified temporal changes in biomarker levels from three MSJR lakes.

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Books on the topic "River stingray"

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Carvalho, Marcelo R. de. Freshwater stingrays of the Green River Formation of Wyoming (early Eocene), with the description of a new genus and species and an analysis of its phylogenetic relationships (Chondrichthyes, Myliobatiformes). New York, NY: American Museum of Natural History, 2004.

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