Results 31 to 40 of about 663 (179)

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. The present study aimed to investigate the presence of steroidogenic cells in mesonephros of Podocnemis expansa during gonadal ...
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   +4 more sources

Sincronia entre o regime de vazante do rio e o comportamento de nidificação da tartaruga da Amazônia Podocnemis expansa (Testudinata: Pelomedusidae) [PDF]

Acta Amazonica, 1982
Resumo Há uma sincronização entre a vazante e o desencadeamento do comportamento de nidificação da tartaruga da Amazônia Podocnemis expansa. O comportamento de nidificação só começa quando o nível da água se estabiliza em seu nível mais baixo.
Cleber J. R. Alho, Luiz F. M. Pádua
doaj   +1 more source

Community-Based Conservation and Management of Chelonians in the Amazon

Frontiers in Ecology and Evolution, 2022
Chelonians represent an important resource in the Amazon, either as a source of protein at the base of the food chain of aquatic and transition ecosystems, or in the dispersion of seeds of plants from floodplains and flooded forests.
Paulo Cesar Machado Andrade, Paulo Henrique Guimarães de Oliveira, Aldeniza Cardoso de Lima, João Alfredo da Mota Duarte, Sandra Helena da Silva Azevedo, Anndson Brelaz de Oliveira, Carlos Dias de Almeida, Eleyson Barboza da Silva, Jânderson Rocha Garcez, José Ribamar da Silva Pinto, Liriann Chrisley Nascimento da Silva, Midian Salgado Monteiro, Wander da Silva Rodrigues, Thiago Luiz Ferreira Anízio, Alfredo Luiz Belém Pontes, Ruth Lima Teixeira, Jefferson Moreira da Silva, Wallice Luiz Paxiúba Duncan, Richard Carl Vogt   +18 more
doaj   +1 more source

Detection of anti-Leptospira spp. agglutinins in captive South American river turtles, Podocnemis expansa [PDF]

Acta Amazonica, 2020
Leptospirosis is a zoonosis transmitted by contact with infected urine or water contaminated with the agent. Searches for Leptospira spp. in reptiles are scarce although most species have contact with aquatic environments.
Katarine de SOUZA ROCHA, Louysse Helene MONTEIRO, Juliana Maria SANTOS MIRANDA, Ianny Watuzy MONTEIRO BAIA, Thamillys Rayssa MARQUES MONTEIRO, Gleiciane SCHUPP DE SENA MESQUITA, Mirian da ROCHA ALBUQUERQUE, Layna THIEMY YOKOKURA, Gabriela CASTANHEIRA PIMENTA, Maria Érika TEIXEIRA GOMES, Pedro Henrique MARQUES BARROZO, Danniel CARVALHO DE CASTRO, André Luiz ABENSUR VIEIRA, Ellen Yasmin EGUCHI MESQUITA, Carla Cristina GUIMARÃES DE MORAES   +14 more
doaj   +1 more source

A systematic compendium of turtle mandibular anatomy using digital dissections of soft tissue and osteology

The Anatomical Record, Volume 306, Issue 6, Page 1228-1303, June 2023., 2023
Abstract Turtles are a charismatic reptile group with a peculiar body plan, which most notably includes the shell. Anatomists have often focused descriptive efforts on the shell and other strongly derived body parts, such as the akinetic skull, or the cervical vertebrae.
Serjoscha W. Evers, Jasper Ponstein, Maren A. Jansen, Jaimi A. Gray, Jörg Fröbisch   +4 more
wiley   +1 more source

Molecular detection of hemogregarines and haemosporidians in Brazilian free-living testudines

International Journal for Parasitology: Parasites and Wildlife, 2018
Morphological and molecular techniques were used to investigate the presence of hemogregarines and haemosporidians in biological samples of free-living Geoffroy's side-necked turtles (Phrynops geoffroanus) and Giant Amazon turtles (Podocnemis expansa ...
Juliana Paula de Oliveira, Marcos Rogério André, José Roberto Ferreira Alves Júnior, Ana Paula Gomes Lustosa, Karin Werther   +4 more
doaj   +1 more source

Osteohistological characterization of notosuchian osteoderms: Evidence for an overlying thick leathery layer of skin

Journal of Morphology, Volume 284, Issue 1, January 2023., 2023
The perpendicular insertion of Sharpey's fibers in the external cortex suggests the presence of a thick leathery skin layer overlying notosuchian osteoderms. Although intramembranous ossification is the main process involved in the development of crocodyliform osteoderms, we reported a case of metaplastic development.
Mariana Valéria de Araújo Sena, Thiago da Silva Marinho, Felipe Chinaglia Montefeltro, Max Cardoso Langer, Thiago Schineider Fachini, William Roberto Nava, André Eduardo Piacentini Pinheiro, Esaú Victor de Araújo, Paul Aubier, Rafael César Lima Pedroso de Andrade, Juliana Manso Sayão, Gustavo Ribeiro de Oliveira, Jorge Cubo   +12 more
wiley   +1 more source

Identifying the current and future status of freshwater connectivity corridors in the Amazon Basin

Conservation Science and Practice, Volume 5, Issue 1, January 2023., 2023
Freshwater connectivity corridors of the Amazon Basin are critical to maintain river services and biodiversity. Among rivers >500 km in length, there are currently 93 freshwater connectivity corridors (FCCs) that are either free‐flowing or of good connectivity status; one‐fifth of these FCCs would lose their free‐flowing status with buildout of ...
Bernardo Caldas, Michele L. Thieme, Natalie Shahbol, Maria E. Coelho, Guenther Grill, Paul A. Van Damme, Ricardo Aranha, Carlos Cañas, Camila K. Fagundes, Nicole Franco‐León, Edgar E. Herrera‐Collazos, Céline Jézéquel, Mariana Montoya, Frederico Mosquera‐Guerra, Marcelo Oliveira‐da‐Costa, Mariana Paschoalini, Paulo Petry, Thierry Oberdorff, Fernando Trujillo, Pablo A. Tedesco, Mauro César Lambert de Brito Ribeiro   +20 more
wiley   +1 more source

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

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   +1 more source

New records of digeneans from Podocnemis spp. (Testudines, Podocnemididae) from Iquitos, Peru

Revista Peruana de Biología, 2011
We obtained 8 digestive tract of the turtle Podocnemis expansa and 18 of P. unifilis from the Belen market (Iquitos, Peru). Only digeneans were studied and identified.
Manuel Tantaleán, Nofre Sánchez, Oscar Pineda Catalan   +2 more
doaj   +1 more source