A note on the reproduction of Geochelone carbonaria and G. denticulata (Testudines, Testudinidae)

Vanzolini, P. E.

doi:10.1590/s0034-71081999000400009

Cited by 10 publications

(6 citation statements)

References 14 publications

(18 reference statements)

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“…For instance, Gonatodes humeralis and Varzea bistriata which are associated with the Amazon, and Philodryas nattereri , Polychrus acutirostris and Brasiliscincus heathi which are typical Cerrado and Caatinga inhabitants. One remarkable exception is Trachemys adiutrix , which is endemic to a small area at the coast of Maranhão and Piauí (see Ávila-Pires 1995, Rodrigues and Prudente 2011, Mesquita et al 2006, Vanzolini 1995 and references therein). Therefore, LMNP has a significant importance for conservation of reptiles in Brazil, as it includes in one relatively small area (155,000 ha), a single taxocenosis of reptiles that combine species from various Brazilian biomes, all in a very unique landscape.…”

Section: Discussionmentioning

confidence: 99%

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Reptiles from Lençóis Maranhenses National Park, Maranhão, northeastern Brazil

Miranda¹,

Costa²,

Rocha³

2012

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We are presenting a list of the reptile species from Lençóis Maranhenses National Park (LMNP), Maranhão, Brazil, obtained during 235 days of field work. The study area is located in the contact zone between three major Neotropical ecosystems: Amazonia, Caatinga, and Cerrado. The PNLM encompasses the largest dune fields in Brazil, wide shrubby areas (restingas), lakes, mangroves, and many freshwater lagoons. We have recorded 42 species of reptiles in the area: 24 snakes, 12 lizards, two worm lizards, three turtles, and one alligator. About 81 % of the recorded species occurred only in restinga areas. Our data highlights the uniqueness of the PNLM in the context of the biomes that surround it and shows the importance of efforts to improve the conservation of reptiles living in the restinga, which currently comprise only about 20 % of the total area protected by the park, but which are the mesohabitat containing most of the reptile species in the Lençóis Maranhenses complex of habitats.

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Section: Discussionmentioning

confidence: 99%

“…There is no published inventory of the flora and fauna of Lençóis Maranhenses National Park. Regarding the fauna of reptiles in the park, the only study we are aware of is a description of a new turtle species by (Vanzolini 1995). The lack of a species list restricts the knowledge of the reptile species composition in the area.…”

Section: Introductionmentioning

confidence: 99%

Reptiles from Lençóis Maranhenses National Park, Maranhão, northeastern Brazil

Miranda¹,

Costa²,

Rocha³

2012

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“…El control de la comercialización de cualquier especie de fauna silvestre, solo es posible si se maneja información básica sobre su biología reproductiva, y hasta la actualidad las investigaciones sobre aspectos reproductivos de C. denticulatus provienen de cautiverio y están relacionadas al número de nidadas, tamaño de nidadas, tiempo entre nidadas y tamaños de huevos (Vanzolini, 1999). Sin embargo, casi nada se conoce de poblaciones silvestres debido a las dificultades que implican su estudio en medio natural; uno de los pocos registros en medio natural es el de Moreira (1991) que reporta datos de seis hembras de la selva brasilera, brindando datos de huevos con cáscara y sin cáscara.…”

Section: Introductionunclassified

BIOLOGÍA REPRODUCTIVA DE HEMBRAS DE Chelonoidis denticulatus, LINNAEUS, 1766 (TESTUDINIDAE), COMERCIALIZADAS EN IQUITOS – PERÚ

USHIÑAHUA-ALVAREZ¹,

ACOSTA-DÍAZ²,

Tirado-Herrera³

et al. 2022

Folia Amaz

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Con el objetivo de contribuir al conocimiento de la condición reproductiva de las hembras de Chelonoidis denticulatus, comercializadas en la ciudad de Iquitos, se desarrolló la evaluación de la biología reproductiva de esta especie durante el periodo de enero a diciembre del año 2008. Ofreciendo así criterios técnicos de utilidad para la regulación de su consumo por la entidad normativa. Se colectaron gónadas de ejemplares beneficiados en dos mercados, previo a ello se midió y pesó cada ejemplar; en laboratorio, se evaluó macroscópicamente las gónadas, midiendo y pesando los ovocitos, cuerpos lúteos y huevos oviducales. Los resultados indican que, en los mercados de Iquitos se comercializan hembras en condición reproductiva madura e inmadura, procedentes de varias cuencas. A lo largo del año, las gónadas evidenciaron hasta 5 estadios de desarrollo, no mostrando una estricta relación estacional. La hembra más pequeña sexualmente madura tuvo un LCC de 325 mm.

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“…1 No. 18 a -10, Bogota, Colombia 2 -Present address: Instituto von Humboldt, Bogotá, Colombia *Corresponding author; e-mail: pstevens@uniandes.edu.co studies, reports exist on the geographic distribution of the species, short term observations, and studies in captivity (Auffenberg, 1965;Fretey, 1977;Medem et al, 1979;Pritchard and Trebbau, 1984;Castaño, 1985;Bjorndal, 1989; Vanzolini, 1998). Therefore, little is known about demographic parameters and limiting ecological factors which could allow us to predict the probability of persistence of natural populations.…”

Section: Introductionmentioning

confidence: 99%

Population size, habitat choice and sexual dimorphism of the Amazonian tortoise (Geochelone denticulata) in Tinigua National Park, Colombia

et al. 2007

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The Amazonian tortoise, Geochelone denticulata, has been classified as vulnerable; nevertheless, necessary ecological and demographic information to formulate conservation plans is limited. In this study we present data on population density, habitat preference, diet and morphological measurements of a population inhabiting a lowland rainforest in Colombia. We used line transect methods to estimate population density over three different years, and we measured and marked 73 individuals in two additional years. The estimated population density based on 158 encounters was similar over the three years (41 ± 20, 38 ± 6, 34 ± 8 ind/km 2 ±SE, respectively). However, we found marked differences between seasons within years, because it was easy to detect individuals (particularly males) during mating periods. There was no evidence of large scale seasonal migrations; thus, it is possible that individuals were missed in the non-reproductive season and therefore our figures may underestimate population size. For the same reason, sex ratios during the mating season may be more biased towards males than for whole year estimates (1.7:1 vs. 1.2:1). Monthly density estimates were significantly correlated with mating frequency and with estimates of fruit abundance, but were not associated with rainfall, temperature or sun radiance. These results suggest that males might use available energy from fruit to travel extensively during the mating season in search of females. However, the most productive forest type in terms of fruit was not preferred by tortoises, to the contrary, they were more commonly encountered in forests with a high proportion of gaps. Males tended to have larger and more elongated bodies than females. This result supports the hypothesis that since males must travel more in search of mates, it is an advantage for them to have an elongated carapace in order to move through dense understory. More ecological information is required from other geographical locations to establish which ecological variables are most important in determining the carrying capacity for terrestrial tortoises. So far the demographic structure of the populations suggest that predation of young individuals plays a major role.

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A note on the reproduction of Geochelone carbonaria and G. denticulata (Testudines, Testudinidae)

Cited by 10 publications

References 14 publications

Reptiles from Lençóis Maranhenses National Park, Maranhão, northeastern Brazil

Reptiles from Lençóis Maranhenses National Park, Maranhão, northeastern Brazil

BIOLOGÍA REPRODUCTIVA DE HEMBRAS DE Chelonoidis denticulatus, LINNAEUS, 1766 (TESTUDINIDAE), COMERCIALIZADAS EN IQUITOS – PERÚ

Population size, habitat choice and sexual dimorphism of the Amazonian tortoise (Geochelone denticulata) in Tinigua National Park, Colombia

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