Scientific Journal of the BirdLife Hungary

A Magyar Madártani és Természetvédelmi Egyesület tudományos folyóirata

Ornis Hungarica. vol.19. (2011) p.53-63.

A csilpcsalpfüzike (Phylloscopus collybita) vonulásának változása 23 év alatt
Csörgő Tibor, Harnos Andrea

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The migration timing of several bird species have changed during the past few decades. The measure of changes are influenced by the migration strategy, distance of the wintering area, sex, age etc. In the present study we analysed the data of 10 288 chiffchaffs collected between 1984 and 2006 at the Ócsa Bird Ringing Station.
Meteorological data derived from the weather station in Pestszentlőrinc. Mean monthly minimum temperatures and mean monthly precipitation were calculated for the study period and used in all analyses. We fitted Gauss curves on the annual migration waves for males and females, respectively. The maximum point of each curve was used to describe the timing of migration in all cases.
Our results indicate that male chiffchaffs arrived earlier than females in spring, moreover their annual timing of migration showed a positive relationship with mean minimum temperatures in March. Male arrival dates shifted 5–6 days earlier – although the relationship is near significant – while females did not alter their spring arrival dates during the 23 years of the study period. The difference of spring arrival times between the two sexes also depended on the mean minimum temperature in March, in warmer years male arrival preceded female arrival dates. Opposite trends were observed however in autumn; warmer weather caused a delay in male departure dates, while it did not influence female autumn migration timing.