2. For 2 year olds, there was a negative relationship with breeding population size, suggesting that density dependence operated in this colony through limitation of food or some other resource.
3. Survival over the first 2 years of life varied with cohort, but was unrelated to the WNAO. Mean survival over this 2-year period was high at 0.576 (95% CI: 0.444; 0.708).
4. This high survival, combined with a low ‘local’ survival after age 5 years of 0.695 (0.654; 0.733) and observations of the Isle of May chicks at other colonies, suggests that most surviving chicks return to the natal colony before deciding whether to recruit there or move elsewhere.
Keywords: capture–mark–recapture, common guillemot, density dependence, North Atlantic Oscillation, recruitment
http://dx.doi.org/10.1111/j.1365-2656.2006.01035.x
Crespin, L., Harris, M.P., Lebreton, J-D, Frederiksen, M., Wanless, S.,
Crespin et al (2006)
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