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Porträtt av Henrik Smith. Foto.

Henrik Smith

Professor

Porträtt av Henrik Smith. Foto.

Polygynous male starlings allocate parental effort according to relative hatching date

Författare

  • Måns Bruun
  • Maria Sandell
  • Henrik G. Smith

Summary, in English

In many polygynous bird species, males allocate most of their parental effort to their primary females’ broods. There are several hypotheses that may explain this: the relative reproductive value of the brood, the energetic demand of the brood, the genetic quality of the female and the certainty of fatherhood may all be higher for the primary females’ broods. Since these parameters may covary in nature, experiments are necessary to determine their importance. Bigynous male European starlings,Sturnus vulgarispredominantly incubated the eggs and fed the nestlings of their primary females. In an experiment we altered the order in which the clutches hatched by exchanging the primary and secondary females’ eggs before hatching. Even though experimental males mostly incubated their primary females’ clutches, they predominantly fed the nestlings of the secondary female. Experimental males fed secondary females’ nestlings significantly more than control males did. In fact, experimental males invested in their secondary females’ broods to the same extent as control males invested in their primary females’ broods. This result demonstrates that males use relative brood age to decide how to allocate their parental effort between their broods which has important implications for the evolution of the starling mating system.

Avdelning/ar

  • Biodiversitet
  • Biodiversitet och bevarandevetenskap

Publiceringsår

1997

Språk

Engelska

Sidor

73-79

Publikation/Tidskrift/Serie

Animal Behaviour

Volym

54

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier Ltd

Ämne

  • Ecology

Status

Published

Forskningsgrupp

  • Biodiversity and Conservation Science

ISBN/ISSN/Övrigt

  • ISSN: 1095-8282