Abstract
The time of 'the onset of spring', viz. of favourable weather conditions and of vegetational development, does not seem to be more predictable at high latitudes than at low (data analysed from Norway), and thus cannot be used to explain the phenomenon of leap-frog migration in birds, i.e. it cannot explain why birds which breed in northern areas do not over-winter nearby as their more southern relatives do. When evaluating over-wintering and migration strategies in birds the basic points in comparison of different latitudinal areas are not only the phenological and climate predictability, but also the factors of competition and predation in the breeding areas, and the problem of building up enough resources to meet environmental stresses during the arrival and breeding.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
