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North American population estimates of waterbirds, vultures and hawks from migration counts in Veracruz, Mexico

Ernesto Ruelas Inzunza, Auteur ; Laurie J. Goodrich, Auteur ; Stephen W. Hoffman, Auteur

Dans Bird Conservation International (20(2) JUN 2010)

Continental-scale bird population estimates are used as a decision-support tool in conservation plans. The calculation of these estimates includes the use of density values and survey data from one or multiple sources extrapolated to the geograp[...]

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