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The Condor
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ZENODO
Article . 2002
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The Condor
Article . 2002 . Peer-reviewed
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Productivity and Nesting Success of Thick-Billed Parrots

Productividad y Éxito de Anidación de Rhynchopsitta pachyrhyncha
Authors: Monterrubio, T; Enkerlin-Hoeflich, E; Hamilton, RB;

Productivity and Nesting Success of Thick-Billed Parrots

Abstract

Abstract We studied productivity and nesting success of the Thick-billed Parrot (Rhynchopsitta pachyrhyncha) during a 7-year period (1995–2001) in five nesting areas at the Sierra Madre Occidental in Mexico. Two breeding areas continue to be the breeding strongholds for the species. We found 553 cavities with associated pairs and determined the outcome of 187 accessible nests. Of 510 eggs followed, 405 (79%) hatched, and 307 (60%) produced fledglings. Clutch size averaged 2.7 eggs, and mean reproductive output was 1.6 fledglings per egg-laying pair. Overall nest success was 80% and ranged from 88% in 1996 to 60% in 2000. This was higher than nest success of most psittacines, and we consider productivity excellent in remaining areas of good habitat. Nevertheless, the species has nearly disappeared from many areas of its former range that have been converted from old-growth coniferous stands to immature stands deficient in both nest sites and food. Productividad y Éxito de Anidación de Rhynchopsitta pachyrhyncha Resumen. Estudiamos productividad y éxito de anidación de Rhynchopsitta pachyrhyncha a lo largo de un periodo de siete años (1995 a 2001) en cinco áreas de anidación en la Sierra Madre Occidental en México. Corroboramos que las dos principales áreas de anidación reportadas en la literatura continúan siendo bastiones para la viabilidad de la especie. Encontramos 553 cavidades con parejas activas y evaluamos el desempeño reproductivo en 187 nidos accesibles. De 510 huevos considerados, 405 eclosionaron (79%), y 307 produjeron volantones (60%). Registramos 2.7 huevos por nidada y un desempeño reproductivo de 1.6 volantones por nidada. El éxito general de anidación fue del 80% y varió entre 88% en 1996 y 60% en el 2000. Comparados con cifras para otros psitácidos, los datos indican niveles altos de productividad para las áreas de anidación estudiadas. Sin embargo, la especie ha desaparecido de gran parte de su rango histórico, donde la actividad de extracción forestal ha transformado el bosque maduro de coníferas en rodales inmaduros con escasos sitios para anidación y reducida disponibilidad de alimento.

Keywords

Rhynchopsitta pachyrhyncha, productivity, nesting success, pine forests, Thick-billed Parrot

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
8
Top 10%
Average
Average
bronze