Physical Characteristics of Giant Amazon Turtle (Podocnemis expansa) Nests

Bonach, Kelly; Lewinger, José F.; Silva, Álvaro Pires da; Verdade, Luciano Martins

doi:10.2744/1071-8443(2007)6[252:pcogat]2.0.co;2

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…These compounded factors elucidate why female turtles prefer specific environmental conditions for their hatchlings (Restrepo et al, 2006; Roosenburg, 1996; Wilson, 1998) and why certain species habitually return to the same nesting sites (Congdon et al, 1983; Jackson & Walker, 1997; Loncke & Obbard, 1977). Consequently, turtle nesting activities modify the conditions of surrounding natural habitats, including the temperature and moisture content of soils (Ackerman, 2009; Bonach et al, 2007; Marchand & Litvaitis, 2004). These alterations can indirectly impact the biotic and abiotic conditions of the habitat, influencing resources shared by other species.…”

Section: Introductionmentioning

confidence: 99%

Turtles and tortoises losing the race: Ecology and conservation of Testudines in Indawgyi Lake, Myanmar

Kyaw,

Ong,

Naing

et al. 2024

Integrative Conservation

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Testudines (turtles and tortoises) rank among the most threatened vertebrates globally, with species in Asia particularly vulnerable due to exploitation, unregulated trade, habitat loss, and degradation. This study aimed to understand the ecology and conservation status of turtles and tortoises in the Indawgyi Lake basin. We conducted surveys along 47 transects, each 1–2 km in length, across four sampling periods (total distance covered = 74.9 km). Additionally, we also deployed four traps at three different locations to capture turtles during two of these sampling periods. In addition, we analyzed 14 soil samples collected from five locations to determine the nesting conditions of soft‐shell turtles. Finally, we identified conservation concerns through semi‐structured interviews with 146 local households, including fishermen and hunters, to gather local ecological knowledge (LEK) on the abundance, habitats, and breeding ecology of turtles and tortoises, as well as local conservation perspectives. Seven turtle and tortoise species were identified within the Indawgyi Lake basin. To our knowledge, two of these species, the Myanmar brown leaf turtle (Cyclemys fusca) and Oldham's leaf turtle (Cyclemys oldhamii), have yet to be officially documented in this area. Furthermore, an Amyda sp. (collected on 10 March 2019), known by the vernacular name “Late Par Tate,” is hitherto undescribed and is likely a newly discovered species. Our results showed disturbance (SW = 1.0) and higher organic matter (SW = 0.52) as the main estimators explaining the difference in nest observation frequency. Animal grazing areas had more nests than other sites affected by greater human disturbances. The local community identified hunting (44%), fishing (28%), and deforestation (13%) as the main activities threatening turtle and tortoise populations. The majority of turtles hunted were either consumed (over 43%) or sold to middlemen, who at times sold them on to foreign traders (less than 51%). Alarmingly, 99% of those interviewed expressed a notable deficiency in protection and conservation efforts by the Nature and Wildlife Conservation Division and NGOs. We advocate for enhanced conservation efforts, mainly through stronger enforcement, increased awareness, and the establishment of protection zones with restricted human access to facilitate the recovery of these populations, especially at nesting sites.

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Section: Introductionmentioning

confidence: 99%

Turtles and tortoises losing the race: Ecology and conservation of Testudines in Indawgyi Lake, Myanmar

Kyaw,

Ong,

Naing

et al. 2024

Integrative Conservation

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“…However, there is no consensus regarding the preference for coarser or finer sandy grains. Studies have already found a large variation in the particle size of the sand selected for spawning (Bonach et al, 2007), with finer (Ferreira Júnior & Castro, 2007) or coarser (Ferreira Júnior & Castro, 2005) predominating grains. However, Ferreira Júnior and Castro (2010) found a significant relationship between sediment texture and hatching success, in which nests built with smaller grains had a greater number of eggs hatched.…”

Section: Introductionmentioning

confidence: 99%

Impact of Nest Parameters and Vegetation on Turtle Reproductive Success in the Araguaia River

Ribeiro,

Machado,

Silva

et al. 2024

RGSA

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Objective: The objective of this work is to verify whether these factors influence the hatching of Amazon turtle eggs in this region. Method: For this, data from reproductive periods during the years 2013 and 2019 were used within the selected areas. Only the depth of the nests was related to the total number of eggs, on both beaches, in both years, and with the number of eggs hatched, only on Praia da Saudade in 2013. Results and Conclusion: In 2019, Praias da Saudade and Thaís showed differences between incubation temperature, percentage of finer grains in the sand, distance from vegetation to nests and hatching rate. However, none of the evaluated parameters were related to reproductive success. Factors such as the incubation period, the amount of clay in the sand and the percentage of riverine vegetation may also be possible predictors of reproductive success that should be investigated.

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“…This is a globally popular management strategy that has being applied to several chelonian species, including marine and freshwater species, among these are several Podocnemis spp. (e.g., Alho, 1985;Andrade et al, 2004;Bonach et al, 2003;Fundação Pró-Tamar, 2000;Hernandez et al, 1999;IBAMA, 1989;Soini, 1999;Thompson, 1979;Vásquez, 2017;Yapu-Alcázar et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

ASSESSMENT OF A COMMUNITY MANAGEMENT PROGRAM OF RIVER TURTLES (PODOCNEMIDIDAE: Podocnemis) IN ZÁBALO, ECUADORIAN AMAZON

Varela,

Vela-Torres,

Borman

et al. 2023

Rev Latin Herp

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In Zábalo community within the Cuyabeno Fauna Production Reserve, a 26-year local initiative aimed at river turtle management was initiated following a significant decline in Podocnemis unifilis and P. expansa populations. Despite the program's lengthy history, weak monitoring and validation procedures prompted a comprehensive evaluation of management efficacy to strengthen the communitarian program. This assessment encompasses population estimates derived from nesting data (density, abundance, hatching success, hatchling production) for P. unifilis between 1994 and 2019. Some available data were also compiled for P. expansa which has not been the main focus of the communitarian program. Results highlight a positive temporal trend in P. unifilis population estimators, and a consistent high hatching success (81%), underscoring the program's contribution to the conservation of the species. Nonetheless, further research is imperative to assess age-specific population trends and enhance monitoring and management strategies for the relatively rare P. expansa.

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Physical Characteristics of Giant Amazon Turtle (Podocnemis expansa) Nests

Cited by 6 publications

References 1 publication

Turtles and tortoises losing the race: Ecology and conservation of Testudines in Indawgyi Lake, Myanmar

Turtles and tortoises losing the race: Ecology and conservation of Testudines in Indawgyi Lake, Myanmar

Impact of Nest Parameters and Vegetation on Turtle Reproductive Success in the Araguaia River

ASSESSMENT OF A COMMUNITY MANAGEMENT PROGRAM OF RIVER TURTLES (PODOCNEMIDIDAE: Podocnemis) IN ZÁBALO, ECUADORIAN AMAZON

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