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Composition and abundance of birds in Andean alder (Alnus acuminata) patches with past and present harvest in Bolivia |
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| Authors: | Marolyn Vidaurre Luis F Pacheco Alejandra I Roldán |
| Institution: | a Carrera de Biología, Universidad Mayor de San Andrés, Casilla 3479, Correo Central, La Paz, Bolivia b Estación Biológica Tunquini, Instituto de Ecología, Universidad Mayor de San Andrés, Casilla 10077, Correo Central, La Paz, Bolivia c Centro de Estudios en Biología Teórica y Aplicada (BIOTA) Casilla 9641, La Paz, Bolivia |
| Abstract: | We compared species richness and abundance of birds between five patches under selective Alnus exploitation and five patches that have not been harvested for at least 10 years prior to our study, during the early dry season (April-July 2001), in Cotapata National Park. Using “point counts” we recorded birds and their distribution in two (<1.5 m and >1.5 m) forest layers. Simultaneously we evaluated the floristic structure (size dbh] distribution, basal area, tree density, tree height, and vegetation cover) and composition (diversity) on three transects placed within each Alnus patch. Both bird diversity and vegetation cover were significantly higher in not presently used patches but only for the higher layer of the forest, whereas plant diversity was higher in presently used patches. Lack of differences between the two types of Alnus patches in any of the vegetation parameters measured in the lower layer was coupled with an indistinct avifauna. Small changes in habitat characteristics following a perturbation like selective logging have the potential to affect richness and abundance of birds, at least within the habitats directly affected by the perturbation. |
| Keywords: | Selective logging Yungas Diversity reduction Decreased abundance |
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