Tropical Ecology and Conservation [Monteverde Institute]

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Publication Date

September 2002

Abstract

This study investigated the differences in bird diversity among 12 fruiting Ficus pertusa (Moraceae) trees at various distances from the forest edge in the Monteverde, Costa Rica region. Each of the 12 sites was observed for six nonconsecutive hours over a four-week study period. Bird diversity, abundance, evenness and similarity were calculated for each tree. A significant positive correlation was found between distance from the forest edge and bird diversity at the study sites (R² = 0.630; ANOVA f-value = 17.036; p-value = 0.0021). Crop size was also found to have a significant relationship with diversity (R² = 0.776; ANOVA f-value = 15.630; p-value of distance = 0.0004; p-value of crop size = 0.0382). However, no correlation was found between diversity and diameter at breast height or diversity and crown size. High species turnover among trees was also observed. One species of bird, Turdus grayi (Clay-colored Robin), showed the greatest dominance. Se investigó las diferencias en la diversidad de aves entre 12 árboles de Ficus pertusa (Moraceae) en fruto, a diferentes distancias del borde del bosque en la región de Monteverde, Costa Rica. Cada uno de los árboles fueron observados por seis horas no consecutivas sobre un periodo de cuatro semanas. La diversidad de aves, abundancia, regularidad y similitud fueron calculadas para cada árbol. Una regresión significativa positiva se encontró entre la distancia del borde del bosque y la diversidad de aves en los árboles (R² = 0.630; ANOVA f-value = 17.036; p-value = 0.0021). Se encontró también una correlación entre el número de frutos en los árboles y la diversidad (R² = 0.776; ANOVA f-value = 15.630; p-value of distance = 0.0004; p-value of crop size = 0.0382). Sin embargo, no se encontró una correlación entre la diversidad y el diámetro del tronco del árbol o la diversidad y el tamaño de la copa del árbol. La rotación de las especies de aves entre árboles fue muy alta. Una especie de ave, Turdus grayi (Jiguirro), demostró ser la más común de todas.

Description

Student affiliation: Department of Biological Aspects of Conservation and Environmental Studies, University of Wisconsin-Madison Digitized by MVI

Genre

Reports

Holding Location

Monteverde Institute MVI

Identifier

M39-00117

The effects of distance to the forest edge on avian communities at Ficus pertusa (Moraceae)

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