|Title:||European songbirds and Barn Swallows Hirundo rustica in Ghana: a quest for Constant Effort Sites and swallow roosts in December/January 1996/97|
|Author(s):||Van den Brink B., R.G. Bijlsma & T.M. van der Have (eds.)|
The main aim of this project was to develop operational Constant Effort Sites in wetland habitats in Ghana where moult, condition and survival of European wetland birds could be monitored, thus obtaining information about the condition of European passerines and Swallows wintering in Ghanaian wetlands.
The following locations were visited:
The other roost of some importance, the one at Lake Bosomtwi, was small and may not exist there permanantly. However, the site is useful and offers good opportunities of catching Swallows in numbers of >100 per day when using tapelures. In the past, Swallows have been captured here as well (Grimes 1987), proving the suitability of the site.
Motitoring of numbers and biometry of Swallows at fixed roosts is important to detect annual variations in arrival, age-composition and condition relative to local conditions (rainfall, drought, habitat changes): Ayensudo and Lake Bosomtwi presently offer the best opportunities for such a scheme.
The report contains: