Article Abstract:
An study was done to estimate the population and to characterize the ecology of the Green Parakeet (Aratinga holochlora brevipes Lawrence), an endemic subspecies of Isla Socorro, Mexico. The population was estimated to be 400 to 500 birds, found mostly in Bumelia, Ilex and Guettarda forests representing about 22% of the total area of the island. Observations of flocking, feeding, nesting and defensive behavior are given. Although the species' island distribution may have been reduced, the population density is classified as relatively high.
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Article Abstract:
The onset of incubation in Green-rumped Parrotlets varies among females and in relation to time during laying. It was established that the vast majority of eggs hatch in the order of laying, with no differences in hatching success with laying order. Female parrotlets increased incubation rate over the course of laying by reducing the duration of their recesses off the eggs rather than by reducing the number of trips. It seems that females have a significant amount of control over hatching patterns through their incubation behaviour.
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Article Abstract:
A research study presents information on the nesting habits and nest-site characteristics of the Socorro green parakeet to make up for the non-existence of published information and the lack of biological information on the species. The Aratinga holochlora brevipes is endangered by the increasing degradation of its habitat as a result of overgrazing by sheep on the Mexican island inhabited by the birds. Overgrazing also threatens most of the island's endemic avifauna.
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