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Seasonal Roosts of Red-Lored Amazons in Ecuador Provide Information about Population Size and Structure

Karl S. Berg and Rafael R. Angel
Journal of Field Ornithology
Vol. 77, No. 2 (Spring, 2006), pp. 95-103
Published by: Wiley on behalf of Association of Field Ornithologists
Stable URL: http://www.jstor.org/stable/27639310
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Seasonal Roosts of Red-Lored Amazons in Ecuador Provide Information about Population Size and Structure
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Abstract

Data from roosts of Amazona parrots may be useful in creating demographic models, because these birds exhibit high roost fidelity and pairs are conspicuous in flight. However, few investigators have attempted to track changes in the number of pairs using such roosts. We studied Red-lored Amazons (Amazona autumnalis) at a communal roost in southwest Ecuador over a 1-yr period to understand better their population structure. Population size was estimated at 214 individuals. Counts revealed seasonal variation in numbers, but the occurrence of pairs and singles was seldom correlated. The number of paired individuals using the roost was lower during the breeding period. In contrast, the number of single birds at the roost nearly doubled during the breeding period. Overall, our data suggest that parental responsibilities during the nesting period explain fluctuations in the number of birds at the roost, and such fluctuations can be used to estimate the reproductive portion of the population. Protection of the small mangrove islands where the parrots roost would likely benefit a population that occupies a much larger area and would, at the same time, provide a useful tool for demographic studies of this poorly known neotropical parrot. /// Datos colectados desde dormideros de los loros de Amazona podrían ser aptos para modelos demográficos, pórque suelen ser fieles a los dormideros y vuelan en pareja. Apesar de la apreciacion general de esto, pocos estudios han atentado documentar los cambios en el numero de parejas que visiten los dormideros a menudo. Realizamos un censo del Loro Frentirrojo (Amazona autumnalis) en un dormidero comunal durante un año en el suroeste del Ecuador para obtener datos sobre la estructural de la población. El tamaño de la población fue estimado en 214 individuos. Los datos indicaron una variación estacional y fuerte, sin embargo, la incidencia de parejas e solitarios no siempre estuvieron correlados. El número de parejas fue mucho más bajo durante el periodo de la anidación. Porotro lado, la cantidad de solitarios fue casi el doble durante la época de anidación. En conjunto, los datos sugieren que las responsibilidades asociadas con la reproducción podrian explicar las fluctuaciones grandes en el dormidero y así proveer una estimación de la proporción reproductiva. Protección de las islas pequeñas del manglar podría proveer beneficios a una población que ocupan a un área de habitat mucho más grande y a la vez conservar una herramienta útil para estudios demográficos de un loro neotropical y poco conocido.

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