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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Using bird survey data for conservation planning in Uganda's savannas
Auteurs :	S. Nachuha, Auteur ; D. Pomeroy, Auteur
Type de document :	Article
Dans :	Ostrich (No number JUL 2001)
Article en page(s) :	162-166
Langues:	Anglais
Résumé :	Concern for conservation of tropical forests and wetlands has been considerable in recent years, while savannas have received less attention, despite their being degraded through burning, over-grazing and tree-cutting, mainly for fuel. But tropical savannas are also species-rich,and support some useful and rare species of birds. They are particularly important for raptors and granivores. A classic vegetation map for Uganda defines 14 savanna types, varying in woody cover, drainage, and rainfall amounts and patterns. Results from hour-long Timed Species Counts (TSCs) - which generate data on species abundance on a zero to six scale - were used to evaluate these 14 types in terms of species richness and importance to threatened species. A vegetation type designated 'I', whose extent is too small to have been mapped by Langdale-Brown et al. (1964) was also evaluated, giving a total of 15 vegetation types. Data from 350 TSCs at 35 sites were analysed. Vegetation types receiving higher rainfall tended to support more species of birds, but they were of limited significance for threatened species,for which drier areas were sometimes the most important. Because the ranking of vegetation types based on species richness differed markedly from that based on threatened species, both of these criteria need to be considered for conservation evaluation purposes. A ranking system taking into account species richness, threatened species and also the extent to which each vegetation type is represented in Uganda's protected areas, identified four moist vegetation types and two dry vegetation types to be of high importance for conservation, while others tended to have medium or low conservation values.

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