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Distribution and abundance of Caiman crocodilus in the Cano Negro National Wild Life Refuge, Costa Rica Distribucion y abundancia de Caiman crocodilus en el Refugio Nacional de Vida Silvestre Cano Negro, Costa Rica



Distribution and abundance of Caiman crocodilus in the Cano Negro National Wild Life Refuge, Costa Rica Distribucion y abundancia de Caiman crocodilus en el Refugio Nacional de Vida Silvestre Cano Negro, Costa Rica



Revista de Biologia Tropical. Junio; 512: 571-578



The distribution and abundance of a population of Caiman crocodilus fuscus were estimated by monthly counting of eyeshines at night, from February 1999 to March 2000 in six transects of Rio Frio in the Cano Negro National Refuge (RNVSCN), Northern Costa Rica. March was the month with the greatest abundance of caimans observed. The visible fraction of the population (PV2 index) fluctuated between 42.59 % to 54.71 % during the wet season and 35.49 % to 53.93 % in the dry season. The transects of river with greater abundance of caimans were Terron-Sabogal and Sabogal-Playuela. Significant differences were determined in the abundance of caimans between transects, except the transects Entrada San Sebastian-Las Cubas and Las Cubas-Entrada Cano Los Patos and Entrada Cano Los Patos-Terron and Boca Sabogal-Playuela. The population of estimated brown caiman in this study was 2283.48 plus or minus 313.5. The statistical analysis by seasons did not show significant differences in the number of caimans observed. Estimated mean number of caimans per km of river was 74.36 /km for 30.7 km of habitat. The results of this study indicated that the fluctuation in population density during the seasons is attributable to local movements.

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