Abstract

ARANDA-COELLO, J. Manuel. Estimación de la abundancia de Caiman crocodilus (Crocodilia: Alligatoridae) en Caño Negro, Costa Rica, utilizando el modelo N-mixture. Cuadernos de Investigación UNED [online]. 2019, vol.11, n.2, pp.48-53. ISSN 1659-4266.  http://dx.doi.org/10.22458/urj.v11i2.2296.

“Estimation of abundance of Caiman crocodilus (Crocodilia: Alligatoridae) in Caño Negro, Costa Rica, using the N-mixture model”. Introduction: the size (N) of the crocodilian populations can rarely be determined accurately. Objective: to compare methods, the abundance of Caiman crocodilus was estimated for a single population in Costa Rica with spatially replicated counts, with the N-mixture Model and the Messel Method. Methods: I counted caimans at night along 21km of the river Frío (Betel-Boga Sabogal). I divided the stretch into 32 segments (500m) spaced 200m from each other. Results: the N-Mixture model produced an estimate of 2 162 individuals and the Messel 373. Conclusion: spatially replicated counts, analyzed with the N-Mixture model, seem to provide more reliable data.

Keywords : conservation; nocturnal visual counts; population size; wildlife management; Messel method; monitoring.

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