Nom du corpus

Corpus Systématique Animale

Titre du document

Growth and sex ratio of nestlings in two species of crows: how important is hatching asynchrony?

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Sex ratio
  • Sexual dimorphism
  • Hatching asynchrony
  • Pica pica
  • Corvus corone
Nom du fichier dans la ressource
Oiseaux_v2b_02818
Auteur(s)
  • Tore Slagsvold 1
  • Magne Husby 2
  • Jostein Sandvik 2
Affiliation(s)
  • 1) Department of Biology, Division of Zoology, University of Oslo, Blindern, P.O. Box 1050, N-0316, Oslo 3, Norway
  • 2) Department of Zoology, University of Trondheim, N-7055, Dragvoll, Norway
Résumé

In experimental studies of avian hatching paterns offspring sex has been neglected. This may be a problem if nestling growth and mortality is sex biased, and if this bias is influenced by hatching spread. In a field study of two crow species, the magpie Pica pica and the hooded crow Corvus corone cornix, we manipulated hatching spread. Both species have asynchronous hatching, and adult males are larger than females by 12–14%. The sex ratios obtained from the different experimental groups on day 24 post-hatch (total sample n = 403) did not deviate significantly from unity, nor did the sex ratios obtained among young newly hatched in an incubator (total sample n = 305). Male and female offspring were of similar size at hatching but males were larger on day 24 post-hatch. Males seemed to be more costly to rear than females, judging by the 20% difference in the mean amounts of food found in the gizzards of the young on day 24 post-hatch. Dimorphism in body size did not seem to be influenced by degree of hatching spread. Asynchronous hatching did not seem to be needed to produce high quality offspring of the larger sex (i.e. males), nor did asynchronous hatching help to ensure equal parental investment in male and female progeny. One reason for the latter negative results may be that the size dimorphism of the two crow species studied were relatively small.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - ecology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - ecology
Identifiant ISTEX
CC22F28A14BCFC6C8AD2050EBA0D23A6B160CECB
Revue

Oecologia

Année de publication
1992
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.523
Sous-corpus
  • Oiseaux
Type de publication
Journal
ark:/67375/1BB-CG1N6WTP-5
Powered by Lodex 9.3.8