INVESTIGADORES
CUETO Victor Rodolfo
artículos
Título:
Foraging behavior and microhabitat use of birds inhabiting coastal woodlands in east-central Argentina
Autor/es:
CUETO, VÍCTOR RODOLFO; LOPEZ DE CASENAVE, JAVIER
Revista:
Wilson Bulletin
Editorial:
Wilson Ornithological Society
Referencias:
Año: 2002 vol. 114 p. 342 - 348
Resumen:
ABSTRACT.We examined foraging behavior and microhabitat use of four passerine bird species inhabiting
an old growth coastal woodland in Buenos Aires Province, Argentina. Based on foraging maneuvers, we identified
two groups: (1) nonaerial foragers formed by Tropical Parulas (Parula pitiayumi) and Masked Gnatcatchers
(Polioptila dumicola) that hopped on branches and twigs while searching and gleaning prey from the nearby
foliage, and (2) aerial foragers formed by White-crested Tyrannulets (Serpophaga subcristata) and Small-billed
Elaenias (Elaenia parvirostris) that searched for and detected prey while perched, and captured it from foliage
or in the air. Nonaerial foragers found prey primarily in the canopy while aerial foragers captured prey at all
heights in the woodland. Tree species selection was similar among the four species. All bird species disproportionately
foraged in Scutia buxifolia and avoided the use of Ligustrum lucidum trees. Our results indicate that
these bird species differed in microhabitat selection in old growth coastal woodland, and that nonaerial foragers
were more sensitive to foliage architecture and foliage height distribution than aerial foragers. These results
illustrate the importance of woodland logging to bird densities, and provide basic information for effective
management.Parula pitiayumi) and Masked Gnatcatchers
(Polioptila dumicola) that hopped on branches and twigs while searching and gleaning prey from the nearby
foliage, and (2) aerial foragers formed by White-crested Tyrannulets (Serpophaga subcristata) and Small-billed
Elaenias (Elaenia parvirostris) that searched for and detected prey while perched, and captured it from foliage
or in the air. Nonaerial foragers found prey primarily in the canopy while aerial foragers captured prey at all
heights in the woodland. Tree species selection was similar among the four species. All bird species disproportionately
foraged in Scutia buxifolia and avoided the use of Ligustrum lucidum trees. Our results indicate that
these bird species differed in microhabitat selection in old growth coastal woodland, and that nonaerial foragers
were more sensitive to foliage architecture and foliage height distribution than aerial foragers. These results
illustrate the importance of woodland logging to bird densities, and provide basic information for effective
management.Polioptila dumicola) that hopped on branches and twigs while searching and gleaning prey from the nearby
foliage, and (2) aerial foragers formed by White-crested Tyrannulets (Serpophaga subcristata) and Small-billed
Elaenias (Elaenia parvirostris) that searched for and detected prey while perched, and captured it from foliage
or in the air. Nonaerial foragers found prey primarily in the canopy while aerial foragers captured prey at all
heights in the woodland. Tree species selection was similar among the four species. All bird species disproportionately
foraged in Scutia buxifolia and avoided the use of Ligustrum lucidum trees. Our results indicate that
these bird species differed in microhabitat selection in old growth coastal woodland, and that nonaerial foragers
were more sensitive to foliage architecture and foliage height distribution than aerial foragers. These results
illustrate the importance of woodland logging to bird densities, and provide basic information for effective
management.Serpophaga subcristata) and Small-billed
Elaenias (Elaenia parvirostris) that searched for and detected prey while perched, and captured it from foliage
or in the air. Nonaerial foragers found prey primarily in the canopy while aerial foragers captured prey at all
heights in the woodland. Tree species selection was similar among the four species. All bird species disproportionately
foraged in Scutia buxifolia and avoided the use of Ligustrum lucidum trees. Our results indicate that
these bird species differed in microhabitat selection in old growth coastal woodland, and that nonaerial foragers
were more sensitive to foliage architecture and foliage height distribution than aerial foragers. These results
illustrate the importance of woodland logging to bird densities, and provide basic information for effective
management.Elaenia parvirostris) that searched for and detected prey while perched, and captured it from foliage
or in the air. Nonaerial foragers found prey primarily in the canopy while aerial foragers captured prey at all
heights in the woodland. Tree species selection was similar among the four species. All bird species disproportionately
foraged in Scutia buxifolia and avoided the use of Ligustrum lucidum trees. Our results indicate that
these bird species differed in microhabitat selection in old growth coastal woodland, and that nonaerial foragers
were more sensitive to foliage architecture and foliage height distribution than aerial foragers. These results
illustrate the importance of woodland logging to bird densities, and provide basic information for effective
management.Scutia buxifolia and avoided the use of Ligustrum lucidum trees. Our results indicate that
these bird species differed in microhabitat selection in old growth coastal woodland, and that nonaerial foragers
were more sensitive to foliage architecture and foliage height distribution than aerial foragers. These results
illustrate the importance of woodland logging to bird densities, and provide basic information for effective
management.