In a changing world, with more chaotic weather patterns and rapidly altering habitats, migratory birds are faced with opportunities and challenges. Long-term monitoring of colour-ringed Black-tailed Godwits, during a period of range expansion and phenological change, has revealed that individuals behave consistently over time but that the behaviour of new generations is moulded by the conditions they encounter.
A changing world
When trying to explain observed changes in the distributions and annual cycles of migratory birds, there are many things to consider:
Colour-rings enable life-time tracking. This bird, caught on its nest, had been ringed as a chick.
Are individual birds able to take advantage of new breeding and non-breeding sites, as they become available, particularly if other areas become less suitable?
- Are individuals able to change the timings and patterns of migration?
- Do individuals adjust their migration routes as a consequence of changes in stop-over or wintering areas?
View original post 1,551 more words