INVESTIGADORES
BELLIS Laura Marisa
artículos
Título:
Latitudinal patterns of bird richness, diversity and abundance in Polylepis australis mountain forest of Argentina.
Autor/es:
BELLIS, L. M., RIVERA, L. , POLITI, N., MARTÍN, E. , PERASSO, M. L. CORNELL, F. AND RENISON D.
Revista:
BIRD CONSERVATION INTERNATIONAL
Editorial:
CAMBRIDGE UNIV PRESS
Referencias:
Lugar: Reino Unido; Año: 2009 vol. 19 p. 265 - 276
ISSN:
0959-2709
Resumen:
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Many South American hotspots of bird endemism
are found in Polylepis dominated forests. Although the avifauna of Polylepis
forests has been relatively well studied in the tropical Andes, little
is known in Argentina. In this study, we characterize the
Argentine avifauna of Polylepis australis forests along their entire
latitudinal gradient of distribution and provide a first systematic bird list
and their conservation status. Fieldwork was carried out from 1,500 to 2,800 m
a.s.l. in three study sites: North (Jujuy province), Centre (Tucuman
province) and South (Cordoba province); we surveyed 30 point counts per site.
We recorded 543 individuals belonging to 50 bird species; two subspecies are
endemic to the South site and four species are typical Polylepis forest birds
of the North and Centre sites. We identified four species of conservation
concern; one globally threatened and three declining at regional level. Bird
richness and abundance decreased with latitude; and equitability
showed an inverse pattern. Sorensons similarity index ranged from 12% to 40%
showing a large latitudinal turnover in avian communities.
Disturbance-sensitive species were the most diverse group in the North site.
Variations in species richness, evenness and guild composition may be a
response to latitude, but also to differences in habitat complexity and food
availability, which appear to be a consequence of forest degradation at the
South site. We recommend: (1) the enlargement of Calilegua National
Park
to include the Polylepis australis belt to assure the conservation of many
disturbance-sensitive species which could decline or disappear in degraded
areas; (2) management of Quebrada del Condorito National Park to increase the
forest structure complexity and therefore provide habitat for
disturbance-sensitive species.