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FEATURE T


he coastal plain of eastern Tamaulipas State in Mexico supports isolated populations of two globally


NS OF CO


OD NEWS


endangered Amazon parrots, the Yellow- headed Amazon (Amazonaoratrix) and Green-cheeked Amazon ( A. viridigenalis), and healthy populations of the Red-lored Amazon (A. autumnalis). A. viridigenalis has a small range and is found only on the Atlantic slope of north-eastern Mexico. In the 1990’s intense studies of these species in the Tamaulipas region, focused on 550 ha of the Los Colorados Ranch, 5km from the Gulf of Mexico, were undertaken by Dr. Ernersto Enkerlin- Hoeflich, now of the Monterrey Institute of Technology and Higher Education, Mexico. Back then, the research site was made up of a mixture of native woodland fragments, wooded pastures, and open pastures set in a broader landscape dominated by open pastures. The studies included counting parrotsat large nocturnal roosts, and the calculation of nest densities, and provided important natural history and conservation information on these species. In fact it is still used in making conservation assessments, but there has been uncertainty about whether these species of parrots could persist long-term in this landscape highly modified by man. It was not known if the parrots had moved from recently deforested areas into this pastoral landscape or if they could sustain their populations in the pasture habitats.


BIRD SCENE 07


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