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The spectacled caiman, Caiman crocodilus , is ecologically and economi­caly important in some areas of Latin America. In Costa Rica it is not abundant and there is a need for population data. I studied it in Cano Negro National Wildlife Refuge, Costa Rica, through the collection and comparison of previous studies and the incorporation of recent infor­mation. I made night boat trips with a 2 million lumen lamp (400m spec­trum) and manually captured individuals under 60cm long. For larger sizes or animals located in areas of difficult access, I used Thompson ties and 2m long poles with an inserted rope, and captured 180 caiman. Most were sub-adults and there were 1:12 females per male, unusually high for the species and possibly caused by environmental conditions. The efects of global warming could disrupt the sex ratio and reproduc­tive structure of spectacled caimans.

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Cambios en la estructura poblacional del caimán, Caiman crocodilus (Crocodylia: Alligatoridae) y su posible relación con el cambio climático, en Caño Negro, Costa Rica