4166 measurements of the wing length of Reed Warblers were collected during 9 breeding and pre-migratory periods in Central Poland. In the studied population significant differentiation in the wing length among seasons was shown in adult and juvenile birds. Multiple regression and path analysis showed that weather factors (temperature and precipitation) during breeding period determine the long-term variation in the wing length in both adult and young birds. Changes in wing length were explained by natural selection and habitat selection. In breeding and pre-migratory periods, temperature and precipitation influence changes in food availability, and thus affect optimisation of energetic expenses on feeding. It was revealed that long-winged individuals are best adapted to cold and rainy conditions, while the short-winged ones - to warm and dry summers. Weather conditions in the period of birds arrival to the breeding grounds may be connected with differentiation in availability of optimal places for establishing territories. In that way they influence intraspecific competition for breeding territories and the effectiveness of their occupation by morphometrically different birds.
|Long-term variability of wing length in a population of the reed warbler Acrocephalus scripaceus / Nowakowski, Jacek J.||2020-10-02|
Procházka, Petr (1976– )
Poulin, Brigitte (1962– ) Lefebvre, Gaëtan (1962– ) Metref, Slimane
Dyrcz, Andrzej (1933– )
Kruszewicz, Andrzej (1959– ) Dyrcz, Andrzej (1933– )
Surmacki, Adrian Stępniewski, Janusz Zduniak, Piotr
Piotrowska, Małgorzata Wesołowski, Tomasz (1950– )
Dunajewski, Andrzej (1908–1944)
Nowakowski, Jacek J.