acoplamiento de aves en agroecosistemas

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Cerezo, Alexis; Robbins, Chandler S.; Dowell, Barbara
Uso de hábitats modificados por aves dependientes de bosque tropical en la región
caribeña de Guatemala
Revista de Biología Tropical, vol. 57, núm. 1-2, marzo-junio, 2009, pp. 401-419
Universidad de Costa Rica
SanPedro de Montes de Oca, Costa Rica
Disponible en: http://www.redalyc.org/src/inicio/ArtPdfRed.jsp?iCve=44918836036

Revista de Biología Tropical
ISSN (Versión impresa): 0034-7744
rbt@cariari.ucr.ac.cr
Universidad de Costa Rica
Costa Rica

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Uso de hábitats modificados por aves dependientes de bosque tropical
en la región caribeña de Guatemala
Alexis Cerezo1,2, Chandler S. Robbins3 & Barbara Dowell3
1.
2.
3.

Fundación para el Ecodesarrollo y la Conservación (FUNDAECO), 25 calle 2-39, zona 1, Ciudad de Guatemala,
Guatemala, CP 0101; acerezo@agro.uba.ar
Cátedra de MétodosCuantitativos Aplicados, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín
4453, (1417) C.A.B.A., Argentina.
Patuxent Wildlife Research Center, Biological Division of the United States Geological Survey, U.S.A. 11410
American Holly Drive, Laurel, MD 20708-4015; crobbins@usgs.gov, bdowell@usgs.gov
Recibido 27-iii-2008.

Corregido 09-vi-2008.

Aceptado 09-vii-2008.

Abstract:Modified-habitat use by tropical forest-dependent birds in the Caribbean region of Guatemala.
As natural areas are reduced into isolated remnants, the importance of secondary habitats for species conservation will increase. Consequently, the conservation value of human-modified or created secondary habitats
must be determined. in this study, we evaluated the conservation potential of three habitatsassociated to cattle
ranching (riparian forest, live fence, and pasture) for tropical forest birds in the Caribbean region of Guatemala.
We studied the bird communities of five tropical forest and riparian forest (henceforth river) sites, three live
fence sites and four pasture sites, in five cattle ranches in the region, and compared the four habitats based on
the following parameters: speciesrichness, number of individuals, species composition and an index of conservation importance. A 10-point series was sampled (six repetitions of each series) in each habitat site using
the point-count method, in march and april of 1998 and 1999. Although forest, river and live fence had similar
mean species numbers, considering all species (111, 96 and 94 species, respectively), and river andlive fence
surpassed the forest in mean number of individuals (80 and 72 compared to 56 individuals), river and live fence
had significantly fewer mean numbers of interior-forest resident species and individuals (56, 21 and 15 species,
and 61, 19 and eight individuals in forest, river and live fence, respectively). River and live fence, when compared to forest, had no significant differences inthe number of resident forest-edge species and individuals, but
their edge-species composition was significantly different from forest. Those resident edge species that were
relatively abundant in forest had very low abundances in the modified habitats, and those that were abundant in
river and live fence were rare or absent in forest sites. With respect to migratory species, both river and livefence
were very important, and the river was more important than forest, according to the conservation importance
index. We conclude that these modified habitats have very little value for tropical forest-dependent resident species, but are extremely important for migratory species, particularly those of arboreal habits. We also stress that
the conservation importance of alternative habitats...