Ecological notes on the Green Parakeet of Isla Socorro, Mexico

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.

Environmental aspects, Mexico, Natural history

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Variation in the onset of incubation in a Neotropical parrot

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.

Research, Birds, Bird eggs, Bird nests

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