A5012232365- Turtle Biology and Conservation
- Amphibian and Reptile Biology
- Fish biology, ecology, and behavior
- Wildlife Ecology and Conservation
- Animal and Plant Science Education
- Animal Behavior and Reproduction
- Ichthyology and Marine Biology
- Species Distribution and Climate Change
- Venomous Animal Envenomation and Studies
- Wildlife-Road Interactions and Conservation
- Marine animal studies overview
- Bird parasitology and diseases
- Mercury impact and mitigation studies
- Avian ecology and behavior
- Rabies epidemiology and control
- Animal Vocal Communication and Behavior
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Fish Biology and Ecology Studies
- Primate Behavior and Ecology
- Parasite Biology and Host Interactions
- Genetic diversity and population structure
- Paleontology and Evolutionary Biology
- Plant and animal studies
- Rangeland and Wildlife Management
- Heavy Metal Exposure and Toxicity
National Institute of Amazonian Research
2015-2024
Regierungspräsidium Stuttgart
2022
Universidade Regional do Cariri
2018
Fundação de Amparo à Pesquisa do Estado do Amazonas
2014
Instituto Nacional de Estudos e Pesquisa
2014
Universidade Federal do Amazonas
2014
Nature Conservation Centre
2012
Universidad Nacional Autónoma de México
1984-2002
Carnegie Museum of Natural History
1979-1982
University of Wisconsin–Madison
1979
The sex of hatchling map turtles is determined by incubation temperature eggs in the laboratory as well nature. Temperature controls differentiation rather than causing a differential mortality sexes. has no effect on determination soft-shelled turtle.
We present a review and analysis of the conservation status International Union for Conservation Nature (IUCN) threat categories all 360 currently recognized species extant recently extinct turtles tortoises (Order Testudines). Our is based on 2018 IUCN Red List 251 listed species, augmented by provisional assessments Tortoise Freshwater Turtle Specialist Group (TFTSG) 109 unlisted freshwater turtles, as well re-assessments several outdated assessments. Of tortoises, this combined indicates...
Corresponding Editor: S. J. Arnold
Abstract In many turtles sex differentiation is controlled by the incubation temperature of embryo, with low temperatures producing males, high females. This study investigates developmental period temperature‐sensitivity in two species emydid turtles, using different combinations at a male‐determining (25°C) and female‐determining (31°C). The sensitive extends throughout much middle third development. Sex more readily influenced 25° than 31°, however, so that maleness can be determined...
Genetic studies of multiple paternity are a valuable tool to gain information on the reproductive biology turtles.We analyzed type in Podocnemis sextuberculata and related number fathers per nest nesting period (beginning, middle, or end season); clutch size (number eggs); female size; hatchling success.Females were captured maximum linear carapace lengths measured during 60 days that encompass season at Rio Trombetas Biological Reserve (Pará, Brazil).Nests marked blood samples collected...
Journal Article SEX DETERMINING TEMPERATURES IN TURTLES: A GEOGRAPHIC COMPARISON Get access J. Bull, Bull Department of Genetics University Wisconsin Madison 53706 Search for other works by this author on: Oxford Academic Google Scholar R. C. Vogt, Vogt Section Amphibians and Reptiles Carnegie Museum Natural History 4400 Forbes Avenue Pittsburgh Pennsylvania 15213 McCoy Evolution, Volume 36, Issue 2, 1 March 1982, Pages 326–332, https://doi.org/10.1111/j.1558-5646.1982.tb05048.x Published:...
Incubation temperature is known to determine the sex of hatchlings in many species turtles, including map turtles. Graptemys ouachitensis, G. pseudogeographica, geographica, and painted turtle, Chrysemys picta. This paper presents a study ratio nest ecology natural populations these Wisconsin, but largely for ouachitensis pseudogeographica. Nesting was monitored during June, were obtained from 236 nests August September 1980. The distribution ratios samples two common bimodal, tending be...
Until recently, freshwater turtles were thought to be silent reptiles, neither vocalizing nor hearing very well. We recorded individuals in nature, captivity, and during interactions between adults hatchlings show that adult turtles, Podocnemis expansa, produce sounds out of the water. Sounds emitted by inside egg, open nests, river, captive conditions. Adult females producing while basking, nesting, captivity. Females river approaching responding hatchling sounds. detected 2,122 sounds,...
The description of Amazophrynella minuta was published in 1941 by the Swedish naturalist Douglas Melin based on material from Taracuá (Amazonas state, Brazil). This very brief and morphology few specimens with diagnostic characters color variation not well defined. Moreover, type series is currently poor state conservation. Consequently, taxonomic ambiguity surrounds nominal taxon A. minuta, which hampers many unnamed congeneric species. Herein, we redescribe recently collected locality,...
We studied reproductive ecology and egg survivorship of Podocnemis erythrocephala (Spix 1824) in 4 campina habitats on the Ayuanã River, Santa Isabel do Rio Negro, Amazonas, Brazil. There were 2 nesting periods, first early October other beginning December, separated by a period flash floods. A total 117 nests recorded, with nest density 19.9 nests/ha, mean clutch size 8.7 eggs, volume 14 cm3. Females chose to most open sites, plant cover up 50%. Nest loss reached 100% for season: 70% was...
Abstract Aim We used chelonian distribution data to (1) predict suitable areas of the occurrence for freshwater turtle species using models and (2) evaluate whether these are protected by current network ( PA s). Location The Brazilian Amazon. Methods generated predictions based on BIOCLIM , SVM GLM maximum entropy modelling procedures. run gap analysis compared effectiveness three kinds with different levels protection: integral protection IPA ) only; + sustainable use SUA ); (3) indigenous...
The feeding habits of five species turtles were studied from June-November 1989 and March-June 1990 in the Guapore River its tributaries (San Domingos San Miguel) Costa Marques, Rondonia, Brazil. Turtles captured using unbaited fyke nets. Stomach contents flushed Podocnemis unifilis (N = 351), expansa 3), Phrynops geoffroanus 31), raniceps 5), Chelus fimbriatus 5). We found no seasonal differences food consumed by P. unifilis; however, between sexes. Females more seeds fruits, whereas males...
than previously assumed. Kinosternon leucostomum was an omnivorous generalist in both populations studied. In one lake, which Staurotypus absent, the quantity of animal prey consumed by significantly higher other lake also occurred. The population consuming more grew faster and larger, had larger clutches eggs. Sexual dimorphism head size not related to dietary differences
Three species of map turtle, Graptemys geographica, G. ouachitensis and pseudo geo graphic a, inhabit the Mississippi River near Stoddard, Vernon Co., Wiscon- sin. Adult females all three are similar size distinctly larger than males. One species, has a notably wider head other two. Quan- titative analysis fresh stomach contents 113 adult females, qualitative 74 others feeding observations confirm that use different foods strategies. geographica is carnivore specializing on mollusks. Grap-...
Although turtles are well protected by laws in Brazil, the not enforced some places and ignored others. Based on 15 years of work Rio Negro Basin, we describe history turtle exploitation this region, comment their current conservation status, suggest practical alternatives that necessary to preserve stable populations.
The social behavior of turtles during the nesting season can be attributed to a series functions such as reducing predation, increasing hatchling survivorship, and information exchange between females. However, mechanism(s) used remain in group different phases has yet explained. objective this study is document sounds produced by Giant South American River Turtle, Podocnemis expansa, period, identify how acoustic mechanisms might facilitate aggregation period. From September 2009 October...