Results 131 to 140 of about 315 (154)
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Ecotoxicology, 2016
The use of pesticides is a widely spread practice in Brazilian agriculture, and dispersion of these substances is an important factor for the fauna and flora. Atrazine is an endocrine disruptor in the xenoestrogen class that is used worldwide in agricultural practices. In Brazil, its use is permitted in several crops.
Juliana dos Santos, Mendonça +5 more
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The use of pesticides is a widely spread practice in Brazilian agriculture, and dispersion of these substances is an important factor for the fauna and flora. Atrazine is an endocrine disruptor in the xenoestrogen class that is used worldwide in agricultural practices. In Brazil, its use is permitted in several crops.
Juliana dos Santos, Mendonça +5 more
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Physical Characteristics of Giant Amazon Turtle (Podocnemis expansa) Nests
Chelonian Conservation and Biology, 2007ABSTRACT We determined the relationship between incubation success and physical characteristics of Podocnemis expansa nests on 4 sand beaches of the Araguaia River in the southern Amazon basin, Brazil. Sand samples measuring grain size, humidity, and density were collected during the first 7 days after egg laying.
Kelly Bonach +3 more
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Nesting ecology of Podocnemis expansa (Schweigger, 1812) and Podocnemis unifilis (Troschel, 1848) (Testudines, Podocnemididae) in the Javaés River, Brazil [PDF]
Brazilian Journal of Biology, 2010 Nest site has influence on incubation duration and hatching success of two Neotropical turtles, the Giant Amazon River Turtle (Podocnemis expansa) and Yellow-Spotted Side-Neck Turtle (Podocnemis unifilis - "Tracajá"). The 2000 and 2001 nesting seasons have been monitored at the Javaés River in Bananal Island, Brazil.
Ferreira Júnior, PD., Castro, PTA.
exaly +6 more sources
Prevalence and parasitemia of Haemogregarina sp. in Podocnemis expansa (Testudines: Podocnemididae) from the Brazilian Amazon [PDF]
Brazilian Journal of Veterinary Parasitology, 2015 Seventy-five turtles Podocnemis expansa in the Brazilian Amazon were examined for the presence of ectoparasites and hemoparasites. Samplings were performed in three study areas in the state of Tocantins, Brazil. Twenty-five specimens were sampled per study area (a commercial breeding facility, an indigenous subsistence breeding facility and a wild ...
Amanda Picelli +2 more
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A Demographic Study of the Arrau Turtle (Podocnemis expansa) in the Middle Orinoco River, Venezuela
Chelonian Conservation and Biology, 2010Abstract Podocnemis expansa (the giant South American or arrau turtle) is a freshwater turtle in critical risk of extinction, distributed along the Orinoco, Amazon, and Esequibo river basins. Protection of nesting beaches and headstarting of hatchlings has been in progress since 1989 on the Arrau Turtle Wildlife Refuge located in the Middle Orinoco ...
Guillermo R Barreto
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NESTS CHARACTERIZATION AND SEXUAL IDENTIFICATION OF PODOCNEMIS EXPANSA, AMAZON TURTLE
2022As alterações climáticas e os impactos que o planeta vem sofrendo com as ações humanas, tornam os monitoramentos ecológicos e da biodiversidade imprescindíveis. Estudos sobre determinação sexual dependente da temperatura de incubação dos ovos, em quelônios, apresentam vários desafios, sendo um deles relacionado à identificação sexual dos filhotes.
Gonçalves Kagueiama, Ana Karla +5 more
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Research in Veterinary Science, 2012
The Arrau turtle (Podocnemis expansa) is an endangered species, as a result of long-lasting, unsustainable exploitation. To obtain reference haematological values from the wild Podocnemis expansa during post-laying, 20 turtles were captured in the Orinoco River. Blood was obtained from the dorsal cervical sinus in lithium heparin tubes. Red blood cells
M, Rossini +4 more
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The Arrau turtle (Podocnemis expansa) is an endangered species, as a result of long-lasting, unsustainable exploitation. To obtain reference haematological values from the wild Podocnemis expansa during post-laying, 20 turtles were captured in the Orinoco River. Blood was obtained from the dorsal cervical sinus in lithium heparin tubes. Red blood cells
M, Rossini +4 more
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Skeletochronology of the endangered side-neck turtle, Podocnemis expansa
2008Previous preliminary mark-recapture studies, and assessment of carapace length and annuli of the endangered giant Amazonian river turtle, Podocnemis expansa, have provided some insight into various aspects of their population structure and overall biology.
Chinsamy, Anusuya, Valenzuela, Nicole
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Journal of Morphology, 2011
AbstractWe address the chondrogenic formation of the limbs and the mesopodial ossification pattern of the Pleurodira Podocnemis expansa, to resolve the homology of these elements as well as the pattern of connection of the autopodial elements and the origin of the digital arch. Embryos and juveniles of P.
Lucélia Gonçalves, Vieira +3 more
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AbstractWe address the chondrogenic formation of the limbs and the mesopodial ossification pattern of the Pleurodira Podocnemis expansa, to resolve the homology of these elements as well as the pattern of connection of the autopodial elements and the origin of the digital arch. Embryos and juveniles of P.
Lucélia Gonçalves, Vieira +3 more
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Constant, Shift, and Natural Temperature Effects on Sex Determination in Podocnemis expansa Turtles
Ecology, 2001Environmental sex determination may yield biased sex ratios, as is the case in many reptilian species with temperature-dependent sex determination (TSD). Determin- ing TSD thermal ecology is important to understanding sex ratio evolution in those species, as TSD systems may pose a challenge to Fisherian models that predict the production of 1:1 sex ...
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