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Journal of Animal Ecology 2003
 

Summary: Journal of Animal
Ecology 2003
72, 391­399
© 2003 British
Ecological Society
Blackwell Science, Ltd
Variation and covariation in survival, dispersal, and
population size in barn owls Tyto alba
RES ALTWEGG*, ALEXANDRE ROULIN, MATTHIAS KESTENHOLZ*
and LUKAS JENNI*
*Swiss Ornithological Institute, CH-6204 Sempach, Switzerland; and Department of Zoology, University of
Cambridge, Downing Street, Cambridge CB2 3EJ, UK
Summary
1. Population dynamics are the result of variation in survival, recruitment, emigration
and immigration rates. Covariation between these demographic rates critically affects
the dynamics and magnitude of fluctuations in population size. Such covariation can
arise by environmental factors affecting several rates in similar ways. Also demographic
processes, such as the source­sink and the balanced dispersal process, are expected to
lead to covariation between demographic rates.
2. Here, we study variation and covariation in survival, emigration, immigration, and

  

Source: Altwegg, Res - Avian Demography Unit, Department of Statistical Sciences, University of Cape Town

 

Collections: Environmental Sciences and Ecology