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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Population status of South Africa's three crane species as of the end of 1999 based on a National Crane Census and regional Aerial Surveys
Auteurs :	K. I. McCann, Auteur
Type de document :	Article
Dans :	Ostrich (No number JUL 2001)
Article en page(s) :	126-129
Langues:	Anglais
Résumé :	South Africa is home to three species of crane,the country's national bird the Blue Crane, Africa's largest crane the Wattled Crane and the culturally significant Grey Crowned Crane. The Blue and Grey Crowned Crane are listed as "vulnerable", while the Wattled Crane is listed as "Critically Endangered" in the latest South African Red Data Book of birds. An accurate estimate of the status of an endangered species' population is vitally important for effective conservation management of a population. A National Crane Census and regional aerial surveys were used to determine the first accurate total population estimate for these three crane species. The Blue Crane population is estimate to be 20 100 individuals with 53.0% of this population occurring in the Western Cape province. Significant regional declines in subpopulations have been noted since the early 1980s in the Eastern Cape province by more than half, in the Free State province (by 56.5%), in Mpumalanga (by 33.2%), and in KwaZulu-Natal (by 9.7%). The Blue Crane population in the Western Cape however, has increased from several hundred birds in the early 1980s to 10 650 individuals in 1999. The Grey Crowned Crane population is currently 4220 individuals, which has marginally increased by 18.1% since the last estimate in the early 1980s. The marked difference has been the remarkable increase in the KwaZulu-Natal subpopulation by 141.5% over the last two decades, in spite of the significant declines in the Mpumalanga and Free State subpopulations. The Wattled Crane population numbers have always been low, with the overall population decreasing by 35.5% between 1980 and the current total population of 238 individuals in 1999. The most significant decreases have been observed in the Mpumalanga province (by 82.1%) and in KwaZulu-Natal (by 24.6%).

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