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Diversity of bird feeding guilds in relation to habitat heterogeneity and land-use cover in a human-modified landscape in southern Mexico

Published online by Cambridge University Press:  01 June 2012

Esteban Pineda-Diez de Bonilla
Affiliation:
Departamento de Ecología y Sistemática Terrestres, El Colegio de la Frontera Sur (ECOSUR), Apartado Postal 63, San Cristóbal de Las Casas, 29200 Chiapas, México
Jorge L. León-Cortés*
Affiliation:
Departamento de Ecología y Sistemática Terrestres, El Colegio de la Frontera Sur (ECOSUR), Apartado Postal 63, San Cristóbal de Las Casas, 29200 Chiapas, México
José Luis Rangel-Salazar
Affiliation:
Departamento de Ecología y Sistemática Terrestres, El Colegio de la Frontera Sur (ECOSUR), Apartado Postal 63, San Cristóbal de Las Casas, 29200 Chiapas, México
*
1Corresponding author. Email: jleon@ecosur.mx

Abstract:

Habitat heterogeneity is an important ecological determinant of species richness. We evaluated the diversity within bird feeding guilds as related to habitat heterogeneity and land-use cover in a human-modified tropical landscape. To quantify this process, fine-scale bird census and habitat heterogeneity data were collected for a bird community in a 22.5-km2 fragmented landscape in southern Mexico. Land-use cover data derived from field surveys were used to calculate habitat heterogeneity index values and the extent of each land-use cover type in 239 grid cells of 300 × 300 m. Bird diversity values were obtained based on 1195 point-counts in these cells. Product-moment correlations and linear regression analyses were used to evaluate the relationship between bird-guild diversity values and habitat heterogeneity. A total of 109 resident bird species grouped in six feeding guilds were recorded: insectivores (42%), frugivores (21%), granivores (17%), nectarivores (9%), omnivores (8%) and carnivores (3%). Diversity values for the entire bird community were significantly positively related to habitat heterogeneity, but feeding guilds showed contrasting responses to habitat heterogeneity and the amount of land-use cover: insectivores and frugivores were more diverse and abundant in secondary forests than in any other land-cover. Our findings illustrate the importance of small landscape fragments as potential key refuges for the most diverse and specialized feeding guilds, such as granivores and insectivores.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2012

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