Sammendrag
Aim: In migratory species, individuals often use fixed and individual-specific migration
strategies, which we term individual migration strategy fidelity (IMSF). Our goal
was to test if guillemots have flexible or fixed individual migration strategies (i.e.
IMSF), if this behaviour is consistent across large parts of the genus’ range and if they
were philopatric to geographical sites or a habitat feature.
Location: North Atlantic.
Taxon: Uria spp.
Methods: We quantified consistent individual differences in inter-annual spatial
distribution and habitat occupied throughout the non-breeding period using a large
geolocator tracking dataset of 729 adult seabirds breeding at 13 colonies across
the Northeast Atlantic and repeatedly tracked up to 7 years over a 9-year period.
Additionally, we used a similarity index to calculate relative fidelity to either geographical
sites or habitats and linear mixed-effects models to assess persistence of
spatial site fidelity over multiple years.
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