Conservation status and habitat preferences of the Cozumel curassow

Article Abstract:

The conservation status and habitat preferences of the Cozumel curassow (Crax rubra gricomi) in the forests of Cozumel Island, Mexico, have been determined through the analysis of its population density and size. For the period Oct 1994 to June 1995, the estimated density was 0.0 curassows per sq km and the population size was about 300 birds. The results showed that this species, which is restricted to the island, is within conservation status of critically endangered. Older stands of forests and freshwater sources have positive influence on its distribution while human settlements and access to the forest interior have negative influences.

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Long-term prairie falcon population changes in relation to prey abundance, weather, land uses, and habitat conditions

Article Abstract:

The factors that influence the abundance and reproduction of prairie falcons (Falco mexicanus) in the Snake River Birds of Prey National Conservation Area were determined. A nesting population of the birds was studied during the period 1974-1997, which included two major droughts and associated declines in the populations of Townsend's ground squirrels (Spermophilus townsendii). The results showed that the interactions of military training activities, wildfires and livestock grazing were the major factors that influenced the nesting densities and reproduction of the prairie falcons.

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Habitat use by three breeding insectivorous birds in declining maple forests

Article Abstract:

The Red-eyed Vireo (Vireo olivaceus) and the Black-throated Blue Warbler (Dendroica caerulescens) are not directly affected by sugar maple forests decay. The Least Flycatcher (Empidonax minimus) preferred healthy sugar maple for its habitat. The Red-eyed Vireo is the least sensitive to vegetation structural changes among the three. There are no overall significant changes in habitat use and population densities, except for the Least Flycatcher, amid the present level of sugar maple forests decay.

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