Results 1 to 10 of about 4,340 (218)

Neonatal biometry and characterization of Amazonian Turtle nests (Podocnemis expansa) [PDF]

Acta Scientiarum: Biological Sciences, 2021
The present study aimed to study the reproduction of the Amazon turtle (Podocnemis expansa) through the evaluation of the reproductive parameters of adult females.
Rodrigo Diana Navarro, Ana Carolina Tavora Lima Alves   +1 more
doaj   +8 more sources

Avaliação da predação de Podocnemis expansa e Podocnemis unifilis (Testudines, Podocnemididae) no rio Javaés, Tocantins Evaluation of predation in Podocnemis expansa and Podocnemis unifilis (Testudines, Podocnemididae) in the Javaés River, Tocantins [PDF]

Acta Amazonica, 2009
Podocnemis expansa e P. unifilis são animais de vida longa, com uma demorada maturação sexual, o que influencia uma baixa taxa de substituição de indivíduos.
Giovanni Salera Junior, Adriana Malvasio, Thiago Costa Gonçalves Portelinha   +2 more
doaj   +10 more sources

Avaliação de padrão irregular dos escudos do casco em Podocnemis expansa e Podocnemis unifilis (Testudines, Podocnemididae) Evaluation of irregular pattern of the shell scutes in Podocnemis expansa and Podocnemis unifilis (Testudines, Podocnemididae) [PDF]

Acta Amazonica, 2009
O casco de Podocnemis expansa (tartaruga-da-amazônia) e Podocnemis unifilis (tracajá), os maiores quelônios de água doce da América do Sul, é uma estrutura única que diferencia esse grupo dos vertebrados atuais e está associado a alguns padrões ...
Giovanni Salera-Junior, Adriana Malvasio, Thiago Costa Gonçalves Portelinha   +2 more
doaj   +10 more sources

Cytogenetic comparison of Podocnemis expansa and Podocnemis unifilis: a case of inversion and duplication involving constitutive heterochromatin [PDF]

Genetics and Molecular Biology, 2013
Podocnemis expansa and P. unifilis present 2n = 28 chromosomes, a diploid number similar to those observed in other species of the genus. The aim of this study was to characterize these two species using conventional staining and differential CBG-, GTG ...
Ricardo José Gunski, Isabel Souza Cunha, Tiago Marafiga Degrandi, Mario Ledesma, Analía Del Valle Garnero   +4 more
doaj   +6 more sources

Total Mercury Content in the Tissues of Freshwater Chelonium (Podocnemis expansa) and a Human Health Risk Assessment for the Amazon Population in Brazil. [PDF]

Int J Environ Res Public Health, 2023
Researchers recognize the silent, negative and deleterious effects caused by mercury pollution in gold mining areas. Freshwater turtles are culturally part of the diet of riverside populations in the Amazon region and this area presents mercury (Hg ...
Targino FJ, Ribeiro JDN, Simões JS, Carneiro CS, Lazzarini SM, Souza AR, Ferreira MDS, Mano SB, Mársico ET.   +8 more
europepmc   +2 more sources

Transplantation of nest of amazonian turtle Podocnemis expansa (Schweigger, 1812)

Bioscience Journal, 2020
The main objective of this study is to analyze the effectiveness of the Podocnemis expansa nest transplantation technique used to aid in the conservation of the species, aiming to increase the number of individuals in nature.
Thays Nogueira Lobo Ribeiro, Rodrigo Diana Navarro   +1 more
doaj   +7 more sources

Morphology and immunolocalization of intertubular steroidogenic cell in mesonephros of Podocnemis expansa during gonadal differentiation. [PDF]

Anim Reprod, 2022
Sex steroid hormones are critical in gonadal differentiation in turtles. The gonads are not the only organs responsible for producing these hormones during this phase. Mesonephros play an important role in steroidogenesis.
de Macêdo LB, Magalhães MDS, Dias LC, Lemos KKA, Borges RSM, Saraiva MVA, de Oliveira MF, de Assis AC, de Moura CEB.   +8 more
europepmc   +2 more sources

New insights of karyoevolution in the Amazonian turtles Podocnemis expansa and Podocnemis unifilis (Testudines, Podocnemidae). [PDF]

Mol Cytogenet, 2016
Cytogenetic studies were conducted in the Brazilian Amazon turtles, Podocnemis expansa Schweigger, 1912 (PEX) and Podocnemis unifilis Troschel, 1848 (PUN) to understand their karyoevolution. Their chromosomal complements were compared using banding techniques (C, G-, Ag-NOR and Chromomycin A3) and fluorescence in situ hybridization (FISH), and efforts ...
Noronha RC, Barros LM, Araújo RE, Marques DF, Nagamachi CY, Martins C, Pieczarka JC.   +6 more
europepmc   +6 more sources

Geological control of Podocnemis expansa and Podocnemis unifilis nesting areas in Rio Javaés, Bananal Island, Brazil Controle geológico das áreas de nidificação de Podocnemis expansa e Podocnemis unifilis no Rio Javaés, Ilha do Bananal, Brasil [PDF]

Acta Amazonica, 2003
The distribution of the nests of Podocnemis expansa (Amazon turtle) and Podocnemis unifilis (yellow-spotted side neck turtle) along the point bars of the Javaés River in Bananal Island, demonstrates a clear preference of these chelonians for ...
Paulo Dias Ferreira Júnior, Paulo de Tarso Amorim Castro   +1 more
doaj   +4 more sources

Immunolocalization of aromatase and estrogen and androgen receptors in the gonads and mesonephros of <i>Podocnemis expansa</i> during the first year of life. [PDF]

Anim Reprod
The endocrine regulation of testicular and ovarian development during early life in chelonians remains poorly understood, despite major morphophysiological changes occurring in this period.
Oliveira MFS, Rocha LIQ, Dias LC, Medeiros AM, de Oliveira MF, de Moura CEB, Magalhães MDS.   +6 more
europepmc   +2 more sources