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Porträtt av Henrik Smith. Foto.

Henrik Smith

Professor

Porträtt av Henrik Smith. Foto.

The trade-off between offspring number and quality in the great tit Parus major

Författare

  • Henrik G. Smith
  • Hans Källander
  • Jan-Åke Nilsson

Summary, in English

(1) Trade-offs between brood size and offspring growth and survival were manipulating the size of 221 great tit Parus major L. broods between 1983 (2) Nestling mass, wing length and tarsus length were inversely related to Hatching date also affected nestling growth, but its effect differed between Intrabrood variability in nestling size increased with brood size. (3) Nestling survival was inversely related to brood size. Small nestlings suffered mortality than large ones. The difference in nestling survival rate between categories was too small to equalize their productivity. (4) Fledgling survival to the autumn and to the following breeding season inversely related to brood size; fledglings from reduced broods survived better from control broods, which in turn survived better than fledglings from enlarged This resulted in the most productive category being the control broods. The fledglings increased with their size as nestlings and decreased with their hatching (5) The sex-ratio among independent fledglings was affected by brood size tion; proportionally more males survived in enlarged than in reduced broods. (6) Dispersal distance of juveniles was not affected by brood size, size hatching date, whereas it was affected by sex. The effects of starvation competition on fledgling survival and dispersal

Avdelning/ar

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

Publiceringsår

1989

Språk

Engelska

Sidor

383-401

Publikation/Tidskrift/Serie

Journal of Animal Ecology

Volym

58

Dokumenttyp

Artikel i tidskrift

Förlag

Federation of European Neuroscience Societies and Blackwell Publishing Ltd

Ämne

  • Ecology

Status

Published

Forskningsgrupp

  • Biodiversity and Conservation Science
  • Life History and Functional Ecology

ISBN/ISSN/Övrigt

  • ISSN: 1365-2656