Raptor declines in West Africa: comparisons between protected, buffer and cultivated areas

Abstract

AbstractSince 1970 there has been a dramatic decline of large raptors and terrestrial birds in West African savannahs. Comparative dry season transect counts over 4,697 km of driven transects were performed in 2004–2005 in south-eastern Burkina Faso to assess the abundance of 41 raptor species and large terrestrial species in four National Parks and surrounding hunting zones and cultivated areas. Population sizes were estimated for larger taxa in protected areas using distance sampling and nest searching. Most large vultures and eagles were generally found only in protected areas, with fewer individuals in the surrounding buffer zones and nearly none elsewhere. Conversely, the abundance of most of the smaller species was not different between protected and cultivated areas, and three species were more abundant in cultivated areas. Helmeted guineafowlNumida meleagris, Stanley’s bustardNeotis denhamiand Abyssinian ground hornbillBucorvus abyssinicuswere not found outside protected areas. Within the 1.4 million ha of protected areas in and around south-east Burkina Faso, six species of eagles and vultures have estimated populations ofc. 100–200 pairs, five speciesc. 50–100 pairs, five species have populations of <50 pairs, and the secretary birdSagittarius serpentariuswas not recorded. No specific reason for the collapse of large raptors in non-protected areas (which account for 99% of the area of the countries studied) has been identified, but the consequences of fast human population growth and habitat changes, overhunting, disturbances and poisoning may have played a critical role. Updating information on the conservation status of these species would be an important first step towards their long-term conservation.