A5069097081- Turtle Biology and Conservation
- Fish biology, ecology, and behavior
- Amphibian and Reptile Biology
- Ichthyology and Marine Biology
- Environmental Sustainability and Education
- Venomous Animal Envenomation and Studies
- Wildlife-Road Interactions and Conservation
- Agricultural and Food Sciences
- Bird parasitology and diseases
- Aquaculture Nutrition and Growth
- Parasite Biology and Host Interactions
- Leech Biology and Applications
- Paleontology and Evolutionary Biology
- Fish Biology and Ecology Studies
- Aquaculture disease management and microbiota
- Wildlife Ecology and Conservation
- Isotope Analysis in Ecology
- Fish Ecology and Management Studies
- Avian ecology and behavior
- Rural Development and Agriculture
- Physiological and biochemical adaptations
- Geography and Environmental Studies
- Rabies epidemiology and control
- Fire effects on ecosystems
- Coastal and Marine Management
Universidade Federal do Tocantins
2015-2024
Universidade Estadual Paulista (Unesp)
2023
Faculdade de Tecnologia e Ciências
2023
Instituto de Botânica
2023
Universidade do Tocantins
2000-2016
Universidade Brasil
1999
Universidade de São Paulo
1999
Podocnemis expansa e P. unifilis são animais de vida longa, com uma demorada maturação sexual, o que influencia baixa taxa substituição indivíduos. Suas populações caracterizadas por pequena mortalidade dos adultos, mas alta filhotes embriões. Sendo a predação natural ninhos um fatores mais importantes do baixo sucesso eclosão dessas espécies. No rio Javaés, os ovos recém-eclodidos podem ser predados grande diversidade animais: dentre as aves, urubus (Coragyps atratus Cathartes aura),...
Between 1975 and 2004 the giant South American river turtle (Podocnemis expansa) as well Podocnemis unifilis sextuberculata had part of their nesting beaches protected. This resulted in release approximately 46 million hatchlings apparent recovery these species some areas; however, this ranching program faces operational bureaucratic difficulties. In addition, harvesting wild populations is banned by Brazilian law, thereby excluding local villagers from using natural resource.
The Yellow-spotted River Turtle ( Podocnemis unifilis Troschel, 1848) and the South American (Podocnemis expansa (Schweigger, 1812)) are two turtles species that widely distributed have ecological, economic, cultural importance in Amazon basin. Although sympatric regarding most of their distribution, few studies addressed coexistence these species. To examine this, we analyzed trophic level primary carbon source from diets both Baixo Araguaia, Tocantins, Brazil, using stable isotope analyses...
Abstract The aim of the present study was to investigate sequence shell bone formation in embryos Pleurodira, Podocnemis unifilis . Their bones and cartilage were collected cleared before staining. also examined by obtaining a series histological slices. All bony elements plastron have independent ossification centers, which subsequently join together retain two fontanelles until period hatching. This turtle has mesoplastra, is characteristic Podocnemididae carapace begins form concurrently...
Seventy-five turtles Podocnemis expansa in the Brazilian Amazon were examined for presence of ectoparasites and hemoparasites. Samplings performed three study areas state Tocantins, Brazil. Twenty-five specimens sampled per area (a commercial breeding facility, an indigenous subsistence facility a wild population Javaés River). Hemoparasites genus Haemogregarina found 66% (50/75) turtle specimens, infections restricted to River. The mean level parasitemia was 54/2,000 erythrocytes (2%)....
Detailed studies of the population structure most species turtles in Amazon Basin are lacking throughout their range. We estimated sex ratio, size structure, relative abundance, and recapture index for Giant South American River Turtle (Podocnemis expansa) Javaés River, southern Brazilian Amazon. Field work was conducted between 2004 2009, comprised a total sampling effort 368 hours 92 days. Turtles were captured by diving seining. A 645 individuals (156 adult males, 109 females, 380...
Abstract Large predators have disproportionate effects on their underlying food webs. Thus, appropriately assigning trophic positions has important conservation implications both for the themselves and prey. Large-bodied are often referred to as apex predators, implying that they many levels above primary producers. However, theoretical considerations predict higher lower position with increasing body size. Nitrogen stable isotope values ( δ 15 N) increasingly replacing stomach contents or...
The feeding behavior and the food preference was studied in P. expansa (Schweigger, 1812) unifilis (Troschel, 1848) sextuberculata (Cornalia, 1849). method used for sampling of all occurrences. Students' t test applied on items, to compare differences during development each species. main conclusions are: food, except alive animals, is divided foraging, approach, olfactory recognition, capture, laceration ingestion; persecution observed prey activity; cleptoparasitism occurs three species...
Podocnemis expansa is the largest freshwater turtle in South America and exhibits a complex reproductive behavior. Females lay eggs sandy banks formed during dry season. Nesting habitat can influence hatching success sex determination. In some species, female body size crucial to determine parameters such as clutch shape. this study, we investigate allometric relationships between their tracks, characteristics nest shape beaches along Javaés River, southern Brazilian Amazon. Our results...
This study has been carried out at the central region of Araguaia river on border between states Goiás and Mato Grosso in Brazilian Amazon Basin from September to December 2000. We recorded temperature fluctuation, clutch-size, incubation period hatching success rate hatchlings' sex ratio five nests Podocnemis expansa (Schweigger, 1812). Despite relatively small sample size we infer that: a) P. have a lower than located further south; however, is shorter, clutch-size larger; b) may present...
Crocodilians are ectothermic animals. For this reason, the environmental temperature has substantial effects on their physiology and behavior. The thermoregulatory behavior of these animals involves selective use different types environments. This enables them to reach level for metabolic activities. study aimed determine influence sex, body size, reproductive stage (T b) adult broad-snouted caiman (Caiman latirostris) in captivity. Thermal sensors were surgically implanted peritoneal cavity...
We present new records of the Spot-legged Turtle (Rhinoclemmys punctularia) for states Pará and Tocantins, Brazil. These increase known geographical distribution R. punctularia ca. 500 km southward, reaching southeastern extreme Amazon biome. The Tocantins are from rainforests habitats as in most range species. findings highlight importance future investigations order to better understand South Basin ecotones areas.
Fertile eggs of Podocnemis expansa and unifilis were investigated for the presence enterobacteria, as these two endangered species have potential conservation measures that include egg transfer. Knowledge normal microflora associated with turtles turtle would help effectively manage transfer among institutions. Thirty each collected, aseptically transferred, cracked inside plastic bags containing tetrathionate broth, spread on selective media plates. Ten samples sand water also examined...
Considering the importance of histological sexing technique turtles and few works directed to this objective, it was proposed in study morphometrically histologically characterize gonads P. unifilis expansa. All specimens used work originated Javaés river, around Araguaia National Park, Tocantins State, Brazil. Following a under stereoscope, were collected for routine procedure. A total 187 samples expansa analyzed, which 81.2% identified as female 18.7% male; well 98 samples, 31.6% 68.4%...
The prevalence and parasitemia of the piroplasm Sauroplasma sp. were evaluated in Amazon chelonian Podocnemis expansa Brazil. Samples collected from 75 chelonians 3 locations, including a commercial breeding facility, an indigenous subsistence wild population. found 72% (54/75) chelonians, varied among sampling sites. No significant correlations between sex body condition index chelonians. mean rate was 44.14/2,000 erythrocytes (2.2%), no correlation These results suggest that parasite is...
Este estudo objetivou apresentar uma síntese das características dos crocodilianos (Ordem Crocodylia), com enfoque nas espécies de ocorrência (Caiman crocodilus e Melanosuchus niger) no entorno do Parque Nacional Araguaia Estadual Cantão, Estado Tocantins, Brasil. Também, foi abordado aspectos influência na seleção uso habitat por fatores ambientais interferência populações. Levantamentos populacionais foram executados nos anos 2010, 2011 2012 entre períodos cheias secas, contagens animais,...
Podocnemis expansa (tartaruga-da-amazônia) é o maior e mais importante representante da fauna de quelônios Amazônia devido à sua importância econômica como fonte alimentar para as populações indígenas ribeirinhas desta região. Apesar disso, os aspectos relacionados biologia reprodutiva, assim índices predação natural animais adultos em seu habitat são pouco conhecidos. Nessa pesquisa foi averiguado número fêmeas P. predadas por Panthera onca (onça-pintada) um rio Brasileira. A onça-pintada...
The definition of priority areas for conservation and integrated management actions are essential the effective maintenance recovery natural populations, especially species overexploited by humans. Amazonian chelonians a food resource historically used people, resulting in decline populations worsening risk local extinctions. In this paper, we establish define three most threatened human consumption Brazil (Podocnemis expansa, P. unifilis sextuberculata). To do so, 15 prioritization criteria...
Understanding the relationship between species and environment is crucial to predicting their responses human-induced global changes, i.e., habitat conversion, biological invasions, warming. Precipitation river level are relevant factors that regulate populations of aquatic organisms. We used long-term data assess effects climate on nest number, clutch size (number eggs per nest), hatching success, unviable Giant South American River Turtle (Podocnemis expansa) in a protected area Brazilian...
Sexual identification using anatomical study of urogenital system in hatchlin gs and juvcniles oftracHelllYs tlorbigl/yi (Du lll éril & Bibron) (Repti lia, Testudincs, Elllydidae).Individuais T/'achelllys do/'bigl/yi (Duméril Bibron, 1835) less than 12 months old are examined for sexual through syslelll.Histological analysis is used to conftnn identitication.IJ concluded Ihat accurate possible hatchlings gonadal morphology.Differences between testes ovaries clear 50 histological necessary...
Em razao da falta de material especifico consulta que consolide as principais referencias cientificas e o acumulo do conhecimento tecnico sobre metodologias amostragem, coleta analise dados relativos aos quelonios continentais brasileiros, materializou-se este trabalho, ha muito almejado pela sociedade interessada no assunto. Houve um grande esforco para compatibilizar metodologicamente as particularidades das especies ambientes em areas com lacunas cujos parâmetros se adequam...