Breeding biology of Rock Pipit Anthus petrosus petrosus Montagu, in Brittany dispersion of juveniles La biologie du pipit maritime Anthus petrosus petrosus Montagu en Bretagne dispersion juvenile
Garoche, J.; Sohier, A.
Alauda 722: 133-148
In this new chapter of the study of the biology of Rock Pipit in Brittany we concentrate on juvenile dispersion from their leaving the family group to the end of their first winter. This research is based on the ringing at the nest of 6 cohorts of juveniles carried out between 1993 and 1998 on the east shore of the Saint-Brieuc bay in Brittany. Results indicate that there is no directionality in the dispersal, that dispersal amplitude varies between individuals from one to several tens of km with an average of 8 to 9 km and that very few pipits undertake a proper migration during their first winter. Dispersal takes place according to different strategies, some of which prefigure the different behaviours of males and females. Winter distribution of food resources influences movements and distribution of groups of juvenile pipits.