Fundacion Hidrobiologica George Dahl

Jamundí, Colombia

Fundacion Hidrobiologica George Dahl

Jamundí, Colombia
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Gomez-Gonzalez J.J.,Fundacion Hidrobiologica George Dahl | Narvaez-Barandica J.C.,University of Magdalena | Baez L.,Carbones del Cerrejon Ltd | Patino-Florez E.,Fundacion Hidrobiologica George Dahl
Revista de Biologia Tropical | Year: 2017

C. acutus is cataloged in critical danger in Colombia. We studied its population at Bahia Portete, in order to survey the nesting activities and to obtain valuable information for a conservation management program. This study was undertaken with the participation of the Wayuü community using the Agreement Conservation Model, and took place during July 2007, August 2008, June and August 2009, and March to August 2010 and 2011. Sampling surveys were made by the use of transects along the coast, in order to find nests. For each nesting area found, we recorded the nests biometrics, eggs and hatchlings, fertility of the eggs and reproductive events. We explored a total of 55.12 km, and determined four nesting areas. Colonial nesting and the environmental variables were factors that affected the hatchling success. From the total of nests found, 37 % were oriented towards North, and 48 % were built next to Stenocereus griseus. Juyui island substrate was mostly constituted by sand (71.9 %, 71.44 %). The average number of eggs by nest was 28.42 ± 6.63, the largest egg diameter was 71.84 ± 3.54 mm, the average nest weight was 81.54 ± 9.99 g, and the hatchlings presented an average length of 25.47 ± 1.16 cm. For this specific site in Colombia, the reproductive period begins in March and ends in August. The few areas of nesting and the 95 % fertility suggest the performance of a conservation management program for this species at Bahía Portete. © 2017, Universidad de Costa Rica. All rights reserved.


Espinosa M.I.,University of La Serena | Bertin A.,University of La Serena | Gomez J.,Fundacion Hidrobiologica George Dahl | Mejia F.,Fundacion Hidrobiologica George Dahl | And 4 more authors.
Gayana | Year: 2012

The American crocodile, Crocodylus acutus, has experienced important population declines worldwide due to human persecution, overexploitation and habitat loss. C. acutus remains critically endangered in some countries such as Colombia where the lack of detailed surveys on its ecology and distribution constitutes a major barrier to the development of effective conservation strategies. We conducted a three-year capture-recapture study to investigate the demographic status of C. acutus and to identify environmental variables likely to influence its distribution in Portete Bay (Colombia). We estimated the crocodile population to be relatively small (< 140 animals), to include very few adults, and to demonstrate a very strong defi cit in females in the juvenile class. Both mean air temperature and relative humidity were positively correlated with the number of sightings. In contrast, mean water salinity was found to decrease the probability of observing a crocodile, presumably due to juvenile preference for low salinity areas. Our fi ndings suggest that the population of C. acutus in Portete Bay is at risk and may require human intervention to assure its persistence.

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