SEEN - SE European Bird Migration Network
Directional preferences of migration of the Reed Warbler (Acrocephalus scirpaceus) at Wadi El Rayan, Fayoum, Egypt

Wed Ibrahim
Wadi El Rayan Protected Area, Fayoum, Egypt
wed_abdou@yahoo.com

Wadi El Rayan attracts increasing number of birds especially after establishing of two man-made lakes, so that, the area was designated as important bird area in 1999 by Birdlife International. Ringing activities started in 2001 to study the impact of the lakes on the migration behavior of passerines. The field station was located on the shoreline of the second lake, dominated mainly by reed beds,. During the work 5 014 individuals of 50 species of Passerines were caught using mist-nets and ringed, measured, scored for fat deposit and tested for directional preferences. There is a variable fluctuation of caught birds within and between seasons. During autumn season it is about half of total number of caught individuals every year. Migration dynamics shows that the peak of migration is mainly in mid March and April in spring and mid to end of September in autumn. Unfortunately the number of caught birds is decreasing due to the reduction in water level resulting from changes in the lakes? water regime. During a period 1 March - 4 April, 2 194 orientation experiments were conducted out of which, 922 Reed Warblers were tested for directional preferences. Most of orientation experiments were conducted during the day time, with few experiments during night time. Most individuals tested in orientation experiments showed two main directions SSE and SSW during autumn season while in spring these were NW and NE directions. Few individuals showed different directional preferences while, others showed reverse migration direction.

Created by Pronetix 2006