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Phenotypic correlates and consequences of dispersal in a metapopulation of house sparrows Passer domesticus
 

Summary: Phenotypic correlates and consequences of dispersal in a
metapopulation of house sparrows Passer domesticus
RES ALTWEGG*{, THOR HARALD RINGSBY* and
BERNT-ERIK SáTHER*
*Department of Zoology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
Summary
1. We examine causes and consequences of natal dispersal within a metapopulation
of house sparrows Passer domesticus in an archipelago in Northern Norway where
a large proportion of the individuals is colour-ringed.
2. Less than 10% of the ¯edglings dispersed, i.e. left their natal island.
3. Dispersal was female biased and almost exclusively performed by juveniles.
4. The probability of natal dispersal was not related either to the body condition or
the body mass of the juvenile. Similarly, neither clutch size nor hatching date
explained a signi®cant proportion of the variance in the probability of dispersal.
5. The probability of male natal dispersal was related to the rank of the ¯edgling in
the size-hierarchy within the brood. Low ranking individuals that hatched early in
the season were more likely to disperse.
6. In both sexes, the survival of dispersers at the island of establishment was higher
than among the residents on that island. Similarly, dispersers survived better than
adults that remained on their island of birth.

  

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

 

Collections: Environmental Sciences and Ecology