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Porträtt av Henrik Smith. Foto.

Henrik Smith

Professor

Porträtt av Henrik Smith. Foto.

Early fledging mortality and the timing of juvenile dispersal in the marsch tit Parus palustris

Författare

  • Jan-Åke Nilsson
  • Henrik G. Smith

Summary, in English

Family flocks of Marsh Tits Parus palustris in southern Sweden kept together until 11-15 d after fledging and stayed within the former territory of the parents. Mortality in the family flocks was low in one year (1.2-3.6%) but higher in another (18.6%). This level of mortality is compared with post-dispersal mortality in other species of tits. The occurrence of a parent-offspring conflict with regard to when juveniles should disperse is called in question. The level of aggression from parents towards their young was very low. Experimental broods of increased and reduced size stayed equally long within the parental territory, thus refuting the hypothesis that parents force their young to emigrate to avoid local competition for food or the harassment from the begging young. Dispersal of young from a family flock took place over more than one day. Late dis- persers were significantly smalller than their nestmates. This supports the hypothesis that dominant individuals disperse first, while subdominants stay longer in the safety of the parental territory to increase their self-feeding ability,

Avdelning/ar

  • Evolutionär ekologi
  • Centrum för miljö- och klimatvetenskap (CEC)
  • Biodiversitet
  • Biodiversitet och bevarandevetenskap
  • Livshistoria och funktionell ekologi

Publiceringsår

1985

Språk

Engelska

Sidor

293-298

Publikation/Tidskrift/Serie

Ornis Scandinavica

Volym

16

Dokumenttyp

Artikel i tidskrift

Förlag

Federation of European Neuroscience Societies and Blackwell Publishing Ltd

Ämne

  • Ecology
  • Zoology

Status

Published

Forskningsgrupp

  • Biodiversity and Conservation Science
  • Life History and Functional Ecology

ISBN/ISSN/Övrigt

  • ISSN: 0030-5693