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Differential begging and locomotory behaviour by early and late hatched nestlings affecting the distribution of food in asynchronously hatched broods of altricial birds

In English

Författare

  • Olof Rydén
  • Hans Bengtsson

Summary, in English

Distribution of food to early and late hatchcd nestlings was studied in asynchronously hatched broods of the grr,it tit P~rcrs major, the blackbird Turdus mcrula, and the fieldfare T. pilaris. Food distribution is related to the locomotory and begging behaviour and positions in the nest of these nestlings. Late hatched (small) nestlings were found to beg more often per feed than bigger nectlings and move more towards favoured positions in the nest to counteract selective feeding of bigger young. The functional significance of these differences in the behaviour of early and late hatched nestlings are discussed. It is argued that they are adaptive by 1) ensuring that each nestling survives when food supplies are ample, and 2) by mediating an optimal brood reduction when food is insufficient to raise the entire brood. The roles of asynchronous hatching, and selective feeding which follows from differential behaviour of early and late hatchcd young are discussed in relation to food conditions during the breeding season.

Publiceringsår

1980

Språk

Engelska

Sidor

209-224

Publikation/Tidskrift/Serie

Zeitschrift fuer Tierpsychologie / Journal of Comparative ethology

Volym

53

Dokumenttyp

Artikel i tidskrift

Förlag

Verlag Paul Parey

Ämne

  • Psychology

Nyckelord

  • parent-young interaction
  • behavioral ecology
  • sibling rivalry

Status

Published