Results 111 to 120 of about 3,578 (213)

Independent Transitions to Freshwater Environments Promote Phenotypic Divergence, Not Convergence, in Stingrays

Integrative And Comparative Biology
Synopsis Instances of convergent or parallel evolution provide a potent model system for exploring contingency and determinism in evolutionary biology. Likewise, the multiple, independent habitat transitions from saltwater to freshwater biomes offer opportunities for studying convergent evolution within and among different vertebrate ...
A Magnuson, M N Dean, J C Weaver, J P Fontenelle, N R Lovejoy, M A Kolmann   +5 more
openaire   +2 more sources

Phylogeography and conservation genetics of the Amazonian freshwater stingray Paratrygon aiereba Müller & Henle, 1841 (Chondrichthyes: Potamotrygonidae)

Neotropical Ichthyology
The family Potamotrygonidae is monophyletic comprising three genera: Paratrygon Duméril, Potamotrygon Garman and Plesiotrygon Rosa, Castello & Thorson.
Renata G. Frederico, Izeni P. Farias, Maria Lúcia Góes de Araújo, Patricia Charvet-Almeida, José A. Alves-Gomes   +4 more
doaj   +1 more source

Insectivory in Potamotrygon signata (Chondrichthyes: Potamotrygonidae), an endemic freshwater stingray from the Parnaíba River basin, northeastern Brazil

Brazilian Journal of Biology
Potamotrygon signata is an endemic freshwater stingray species in the Parnaíba River basin, Brazil. After its original description, only citations in systematic lists were recorded in the literature and the biology of the species remains unknown ...
G. Moro, P. Charvet, RS. Rosa
doaj   +1 more source

Physiological parameters of freshwater stingrays from the Uatumã River Basin, Amazon, Brazil

Anais da Academia Brasileira de Ciências
Abstract Knowledge of freshwater stingrays’ physiological parameters is essential for conserving elasmobranch diversity. This study aims to characterize the erythrogram and plasma biochemistry of freshwater stingrays from the Uatumã River basin for the first time. Specimens were captured in Presidente Figueiredo, São Sebastião do Uatumã, and Itapiranga,
MARIA FERNANDA S. GOMES, MAIKO WILLAS S. RIBEIRO, CRISTIANE C. GUIMARÃES, TIAGO C. NÓBREGA, THAYSON L. PINTO, RAYANA M. PAIXÃO, ADRIENE NÚZIA A. SANTOS, PAULO HENRIQUE R. ARIDE, ADRIANO T. DE OLIVEIRA   +8 more
openaire   +3 more sources

Chapter 13: Vulnerability of chondrichthyan fishes of the Great Barrier Reef to climate change [PDF]

, 2007
This chapter addresses the potential impact of climate change on the chondrichthyan fauna of the Great Barrier Reef, that is, the sharks, rays, skates and holocephalans that occur within the Great Barrier Reef region.
Chin, A., Kyne, P.M.
core  

Resolving Species: Urobatis halleri, U. concentricus, and U. maculatus as Subspecies [PDF]

, 2012
Hybridization is the interbreeding of separate species to create a novel species (hybrid). It is important to the study of evolution because it complicates the biological species concept proposed by Ernst Mayr (1963), which is widely adopted in biology ...
Heffernan, Scott
core   +2 more sources

Levels of Total Mercury and Health Risk Assessment of Consuming Freshwater Stingrays (Chondrichthyes: Potamotrygoninae) of the Brazilian Amazon. [PDF]

Int J Environ Res Public Health, 2023
Oliveira AT, Rodrigues PA, Ramos Filho AM, Gomes MFDS, Liebl ARDS, de Pinho JV, Aride PHR, Conte-Junior CA.   +7 more
europepmc   +1 more source

Extinction risk and conservation of the world\u27s sharks and rays [PDF]

, 2014
The rapid expansion of human activities threatens ocean-wide biodiversity. Numerous marine animal populations have declined, yet it remains unclear whether these trends are symptomatic of a chronic accumulation of global marine extinction risk.
Burgess, George H., Carlson, John K., Carpenter, Kent E., Cavanagh, Rachel D., Compagno, Leonard J.V., Davidson, Lindsay N.K., Dulvy, Nicholas K., Ebert, David A., Fordham, Sonja V., Fowler, Sarah L., Francis, Malcolm P., Gibson, Claudine, Harrison, Lucy R., Heupel, Michelle R., Kyne, Peter M., Livingstone, Suzanne R., Musick, John A., Pollock, Caroline M., Sanciangco, Jonnell C., Simpfendorfer, Colin A., Stevens, John D., Valenti, Sarah, White, William T.   +22 more
core   +1 more source

Ecotoxicology of Potamotrygoninae freshwater stingrays: bioaccumulation, toxicological risks, and conservation implications

Frontiers in Marine Science
Obligate freshwater stingrays of the Potamotrygoninae subfamily are endemic to South America and confined to freshwater systems heavily impacted by anthropogenic activities. These pressures often lead to habitat degradation, with unknown impacts on these species’ physiology, behavior, ecology, and survival.
Neuciane Dias Barbosa, Neuciane Dias Barbosa, Natascha Wosnick, Natascha Wosnick, Natascha Wosnick, Ana Paula Chaves, Eloísa Pinheiro Giareta, Renata Daldin Leite, Patricia Charvet, Rachel Ann Hauser-Davis   +9 more
openaire   +2 more sources

Temporal Changes in a Tropical Nekton Assemblage and Performance of a Prawn Selective Gear [PDF]

, 1995
The temporal variation of components of a moderately diverse (H=1.46) tropical estuarine fish assemblage (long. 146°30'E, lat. 8°45'S) was directed by salinities that had been determined by local oceanographic and probably topographic conditions.
Aitsi, Joshep B., Kan, Ting Tien, Kasu, John E., Matsuoka, Tatsuro, Nagaleta, Henry L.   +4 more
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