Finlands Akademi
Namn Pakanen, Veli-Matti
Organisation OY
Projektets titel Causes and consequences of dispersal to individual fitness and population dynamics
Beslutnr 278759
Beslutsdatum 10.04.2014
Finansieringsperiod 01.09.2014 - 31.08.2017
Finansiering 252 018
WebFOCUS Report
Beskrivning av projektet
The project aimed to find out factors affecting dispersal behaviour in different bird populations. The work was conducted using long term data consisting of information about individually marked birds. The main analysis methods included different variations of mixed models and capture-recapture methods. Dispersal between breeding patches was more frequent from small patches and when the patch was close to other patches. Dispersal of juveniles was similar to those of their parents. Furthermore, birds dispersing as juveniles dispersed more likely also as adults compared to those that did not disperse as juveniles. These results suggest that dispersal is somewhat determined by genotypes. Dispersal did not affect adult survival after first breeding in a long distance migrant, the southern dunlin. However, dispersal reduced winter survival of male willow tits, which are resident birds. The costs and benefits of dispersal are seemingly dependent on the life history of the species.