SEEN - SE European Bird Migration Network
Directional preferences of the Chiffchaff (Phylloscopus collybita) during autumn migration in southern Poland

Monika Filar, Karolina Adamska

Bird Migration Research Station, University of GdaƄsk, Poland

The aim of the study was to analyse directions observed in the orientation cages of the Chiffchaffs Phylloscopus collybita tested during autumn migration in southern Poland. Data were collected at Akcja Carpatica ringing station (49º32’N 21º34’E) located in the Beskid Niski Mountains (S Poland) in 2000–2003.
A total number of the tests was 537 that included 535 tests which were statistically significant. All tests were performed according to Busse (1995).
Almost all tested individuals showed such directions as WSW and SSE. These were as follows:
- WSW direction was preferred by: 22% of ind. in 2000, 41% in 2001, 31% in 2002, 29% in 2003, 18% in 2004 and 44% in 2005
- SSE direction was preferred by: 52% ind. in 2000, 34% in 2001, 26% in 2002, 32% in 2003, 36% in 2004 and 22% in 2005.
A basis to further analysis was each year passage dynamics. To follow directional preferences during the whole migration season, catching dynamics of 2003 was divided into periods reflecting migration waves. In all studied periods the Chiffchaff preferred SSE and WSW directions. Chiffchaffs migrating through Akcja Carpatica ringing station show high repeatability of directional preferences in all studied years and in all periods of the year 2003. 

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