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• W1597444310 abstract "Few long-term demographic studies have been conducted in freshwater turtles of South America despite the need for this type of inquiry to investigate natural variation and strengthen conservation efforts for these species. In this study, we examined variation in demography of the Chocoan River Turtle ( Rhinoclemmys nasuta ) based on a population from an island locality in the Colombian Pacific region between 2005 and 2012. At this locality we captured turtles by hand in five streams with a total area of 0.4 ha. We calculated population size with the Jolly-Seber method and compared the population structure of four time periods (2005,2006, 2007, 2011 and 2012). We calculated the probability of survival and capture probability for males, females and juveniles using the Cormack –Jolly-Seber model and we estimated the rate of population growth with the POPAN model. We found increases and decreases in population size, and a significant increase in the percentage of juveniles in 2011 and 2012. In all periods, females dominated the sex structure of the population. Temporal variation in population size may be due to natural changes in habitat or density-dependent effects. However, it may correspond with normal fluctuations in population parameters, therefore continuous monitoring that can be correlated with environmental and physical factors of the habitat could elucidate the causes of the variation. Variacion demografica temporal de la tortuga de rio chocoana, Rhinoclemmys nasuta (Geoemydidae), en Isla Palma, Bahia Malaga, Pacifico del Valle del Cauca Pocos estudios demograficos de larga duracion han sido realizados en tortugas dulceacuicolas de Suramerica, pese a la necesidad de este tipo de investigacion para esclarecer las variaciones naturales y fortalecer procesos de conservacion en este grupo particular. En esta investigacion se estudio la variacion en la demografia de una poblacion de la tortuga de rio chocoana ( Rhinoclemmys nasuta ), a partir de informacion registrada en una localidad insular del Pacifico colombiano entre 2005 y 2012. En esta localidad se capturaron manualmente tortugas en cinco riachuelos con un area total de 0,4 ha. Se calculo el tamano poblacional con el metodo Jolly-Seber en cuatro periodos (2005, 2006, 2007, 2011 y 2012), y se comparo la estructura poblacional. Se estimo la probabilidad de supervivencia y la probabilidad de captura para machos, hembras y juveniles utilizando el modelo Cormack-Jolly-Seber, y la tasa de crecimiento poblacional con el modelo POPAN. Se evidenciaron aumentos y disminuciones en el tamano de la poblacion. Se evidencio un aumento significativo del porcentaje de juveniles que hacen parte de la poblacion durante el periodo de estudio. En todos los periodos las hembras dominaron la estructura de sexos de la poblacion. Las variaciones temporales en el tamano poblacional pueden deberse a cambios naturales en el habitat o a efectos denso-dependientes. Sin embargo, tan solo pueden corresponder a fluctuaciones normales en los parametros poblacionales, por lo tanto monitoreos continuos donde se puedan correlacionar factores ambientales y fisicos del habitat podrian permitirnos elucidar a que se deben estas variaciones." @default.
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• W1597444310 date "2014-07-24" @default.
• W1597444310 modified "2023-10-16" @default.
• W1597444310 title "Temporal variation in demography of the Chocoan River Turtle, Rhinoclemmys nasuta (Geoemydidae), on Isla Palma, Malaga Bay, Pacific coast of Valle del Cauca" @default.
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• W1597444310 doi "https://doi.org/10.15446/abc.v19n3.42890" @default.
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