A Comparison of Maternal and Temperature Effects on Sex, Size, and Growth of Hatchlings of the Magdalena River Turtle (Podocnemis lewyana) Incubated under Field and Controlled Laboratory Conditions

Páez, Vivian P.; Correa, Juana C.; Cano, Amalia; Bock, Brian C.

doi:10.1643/ce-08-149

Cited by 26 publications

(24 citation statements)

References 27 publications

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“…This temperature is very close to 33.4°C the pivotal temperature reported for P. lewyana (Páez et al, 2009a), above 32.8 °C reported for nesting beaches in the Magdalena River (Páez et al, 2012), and a little above the 33.2 °C reported for nesting beaches in the Sinú River (Gallego-García and Castaño-Mora, 2008). The effect of natural temperatures on sex ratios is hard to predict because it is not only the average temperature during the middle third of the incubation period that is important, but also the temperature variability that defines the accumulated heat experienced by the embryos (Valenzuela, 2001).…”

Section: Incubation Temperaturessupporting

confidence: 79%

“…The positive relationship between egg weight and initial hatchling size and one month later in P. lewyana had been documented already (Páez et al, 2009a). Here we find this association is lost by the third month of age; it is likely that other environmental factors such as available food resources (Ceballos et al, 2014) are also influencing body weight.…”

Section: Hatchlings Growthsupporting

confidence: 66%

“…The effect of natural temperatures on sex ratios is hard to predict because it is not only the average temperature during the middle third of the incubation period that is important, but also the temperature variability that defines the accumulated heat experienced by the embryos (Valenzuela, 2001). In addition, the information available on the effect of temperature on sex determination of P. lewyana was obtained using a population in the Mompox Depression of the Magdalena River (Páez et al, 2009a) and pivotal temperatures may vary with genetics, the environment, and even geographic trends (Ewert et al, 2004). However, the incubation temperature achieved with a light bulb at the AAFUVER incubation room was much lower (31.8 °C) than in natural beaches of the Claro Cocorná Sur River.…”

Section: Incubation Temperaturesmentioning

confidence: 99%

“…To understand how reproduction varies across space and time we compared our findings across nesting beaches and seasons. Second, given the effects of incubation temperature on sex, size, and growth of neonates (Páez et al, 2009a) we compared the incubation temperatures in-situ in river beaches with the ex-situ temperatures at the AAFUVER incubation room. Finally, we estimated hatchlings body growth given maternal effects and the captive conditions during the first three months at the AAFUVER station before being released into the river.…”

Section: Introductionmentioning

confidence: 99%

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REPRODUCTION AND CONSERVATION OF THE MAGDALENA RIVER TURTLE (Podocnemis lewyana) IN THE CLARO COCORNÁ SUR RIVER, COLOMBIA

Ceballos

Romero²,

Gómez-Saldarriaga

et al. 2014

Acta biol. colomb.

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Citation / Citar este artículo como: Ceballos CP, RomeRo i, Gómez-saldaRRiaGa C, miRanda K. Reproduction and conservation of the magdalena River turtle (Podocnemis lewyana) in the Claro Cocorná sur River, Colombia. acta biol. Colomb. 2014;19(3):393-400. ABSTRACTThe Magdalena River Turtle, Podocnemis lewyana, is an endangered and endemic turtle from Colombia. Among the most important information needed to conserve endangered species is to identify, monitor, and protect the sites used by the species to reproduce and grow. In this study we report, for the first time, the reproductive output and the nesting beaches of P. lewyana in the Claro Cocorná Sur River, a tributary of the Magdalena River drainage. We systematically examined a river transect of 8 km with 14 sandy beaches during two nesting seasons in one year. We recorded a yearly production of 47 clutches, 957 eggs, and two preferred nesting beaches: Alto Bonito with 51 %, and Bélgica with 28.3 % of this reproductive output. AAFUVER, a community-based organization, has led a headstarting program since 2010 to decrease in-situ egg mortality due to predation on nesting beaches. AAFUVER collects and incubates the eggs ex-situ, raises the hatchlings for one to five months and then releases them into the same river. To understand potential effects of such egg manipulation, we monitored and compared in-situ and ex-situ incubation temperatures. We found exsitu temperatures below the pivotal temperature known for P. lewyana and below the temperatures in nesting beaches. Finally, we monitored hatchlings growth under AAFUVER captive conditions, and found that hatchlings duplicated their body mass during the first three months of age. Egg weight was strongly associated to body weight at hatching, however this association is lost by the third month of age. We strongly encourage supporting this community-based conservation program, and the protection of the Claro Cocorná Sur River as an important nesting and growth habitat for the conservation of P. lewyana.

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Section: Incubation Temperaturessupporting

confidence: 79%

Section: Hatchlings Growthsupporting

confidence: 66%

Section: Incubation Temperaturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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REPRODUCTION AND CONSERVATION OF THE MAGDALENA RIVER TURTLE (Podocnemis lewyana) IN THE CLARO COCORNÁ SUR RIVER, COLOMBIA

Ceballos

Romero²,

Gómez-Saldarriaga

et al. 2014

Acta biol. colomb.

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“…Teniendo en cuenta que la temperatura el aire está correlacionada fuertemente con la temperatura de los nidos (Janzen 1994, Fuentes, et al 2010, se ha predicho que el aumento en la temperatura puede ocasionar feminización de las poblaciones de algunas especies, aumentando su probabilidad de extinción en el futuro (Nelson, et al 2004, Hulin, et al 2009, Fuentes, et al 2010, Kallimanis 2010. P. lewyana presenta TSD y aunque su temperatura umbral es la más alta reportada para una especie de reptil, su rango transicional en las poblaciones del Magdalena es muy estrecho (Páez et al, 2009), lo que hace a estas poblaciones especialmente vulnerables, ya que las condiciones termales necesarias para producir neonatos de ambos sexos ya no se encontrarán disponibles. Hulin et al, (2009) propusieron que las especies con rangos transicionales estrechos y tiempos generacionales muy largos tienen cuatro alternativas para responder al cambio climático: modificar su rango geográfico, convertirse a determinación sexual genética, modificar su comportamiento de anidación, o extinguirse.…”

Section: Discussionunclassified

Potential Distribution of Podocnemis lewyana (Reptilia:Podocnemididae) and Its Possible Fluctuation Under Different Global Climate Change Scenarios

Ortiz-Yusty¹,

Restrepo²,

Páez³

2014

Acta biol. colomb.

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RESUMENEn este estudio se implementó el modelaje de distribución de especies para establecer el rango de distribución potencial de Podocnemis lewyana, explorar los componentes del clima que pueden influenciar dicha distribución y evaluar posibles fluctuaciones de su distribución bajo escenarios de clima futuro. Los modelos obtenidos predicen una distribución continua de sur a norte por todo el río Magdalena, desde los municipios de Rivera y Palermo en el departamento de Huila, hasta los departamentos de Atlántico y Magdalena en el norte. La temperatura fue el elemento del clima que más influyó en la distribución de P. lewyana; esta especie tiende a estar presente en climas cálidos y con poca variabilidad en la temperatura. El modelo de distribución transferido a los escenarios de clima futuro predicen un aumento en el rango geográfico de P. lewyana. Sin embargo, teniendo en cuenta las preferencias de hábitat de esta especie y su fuerte asociación con los cuerpos de agua, este resultado debe tomarse con cautela, dado que el modelo solo tuvo en cuenta variables climáticas terrestres. Dadas las características de historia de vida de esta especie (presencia de determinación sexual dependiente de la temperatura, alta temperatura pivotal y un rango de transición de temperatura muy estrecho), y el efecto negativo de los cambios en los regímenes hidrológicos en la mortalidad embrionaria, la expansión del área potencial de P. lewyana en el futuro no significa que esta especie no vaya a verse afectada por el cambio climático global.Palabras clave: Maxent, modelación de nicho, variables ambientales. ABSTRACTWe implemented a species distribution modelling approach to establish the potential distribution of Podocnemis lewyana, to explore the climatic factors that may influence the species' distribution and to evaluate possible changes in distribution under future climate scenarios. The distribution models predicted a continuous distribution from south to north along the Magdalena River, from Rivera and Palermo in the department of Huila to the departments of Atlántico and Magdalena in the north. Temperature was the variable most influential in the distribution of P. lewyana; this species tends to be present in warm regions with low temperature variability. The distribution model predicted an increase in the geographic range of P. lewyana under climate change scenarios. However, taking into account the habitat preferences of this species and its strong

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The comparative energetics of the turtles and crocodiles

Marn

Kooijman

2022

Ecology and Evolution

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The Add-my-Pet collection of data on energetics and Dynamic Energy Budget parameters currently contains 92 species of turtles and 23 species of crocodiles. We discuss patterns of eco-physiological traits of turtles and crocodiles, as functions of parameter values, and compare them with other taxa. Turtles and crocodiles accurately match the general rule that the life-time cumulated neonate mass production equals ultimate weight. The weight at birth for reptiles scales with ultimate weight to the power 0.6.The scaling exponent is between that of amphibians and birds, while that for mammals is close to 1. We explain why this points to limitations imposed by embryonic

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A Comparison of Maternal and Temperature Effects on Sex, Size, and Growth of Hatchlings of the Magdalena River Turtle (Podocnemis lewyana) Incubated under Field and Controlled Laboratory Conditions

Cited by 26 publications

References 27 publications

REPRODUCTION AND CONSERVATION OF THE MAGDALENA RIVER TURTLE (Podocnemis lewyana) IN THE CLARO COCORNÁ SUR RIVER, COLOMBIA

REPRODUCTION AND CONSERVATION OF THE MAGDALENA RIVER TURTLE (Podocnemis lewyana) IN THE CLARO COCORNÁ SUR RIVER, COLOMBIA

Potential Distribution of Podocnemis lewyana (Reptilia:Podocnemididae) and Its Possible Fluctuation Under Different Global Climate Change Scenarios

The comparative energetics of the turtles and crocodiles

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