Population estimates of three vulture species in Kruger National Park, South Africa
Vultures are globally threatened, yet reliable population data on these birds are few, thus measuring their response to change is difficult. Kruger National Park (KNP) in South Africa is an important stronghold for many avian species, particularly vultures. In this study we generate
population estimates for three vulture species in KNP using two plotless density estimators (PDE): a distance estimator based on nearest-neighbour distance and T-square sampling. We flew aerial censuses over large (c. 3 500 km2) sample areas in two ecogeographically separate parts
of KNP and counted vulture nests visible within predetermined transects. In total 416 White-backed Vulture Gyps africanus, 22 Lappet-faced Vulture Torgos tracheliotos and 24 White-headed Vulture Trigonoceps occipitalis nests were recorded. The nearest-neighbour distance
PDE performed poorly, and we used a T-square PDE calibrated with aerial survey counts to extrapolate across KNP and estimate breeding population sizes. There are an estimated 904 (95% CI±162) pairs of African White-backed Vultures, 78 (95% CI±18) pairs of Lappet-faced Vultures
and 60 (95% CI±13) pairs of White-headed Vultures in KNP. These results provide a basis for investigating how large vultures respond to ecosystem change and understanding their resilience within a broader environmental change scenario.
Keywords: Kruger National Park; aerial survey; density estimator; population estimate; vulture
Document Type: Research Article
Affiliations: 1: Hawk Conservancy Trust, Sarson Lane, Weyhill, Andover Hampshire, SP11 8DY, UK 2: Endangered Wildlife Trust, Private Bag X11 Modderfontein, 1645, South Africa 3: South African National Parks, Private Bag X402 Skukuza, 1350, South Africa
Publication date: 01 March 2013
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