La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Calculating egg volume when shape differs: when are equations appropriate?
Auteurs :	P. Dee Boersma, Auteur ; Ginger A. Rebstock, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (81(4) DEC 2010)
Article en page(s) :	442-448
Langues:	Anglais
Résumé :	Egg volume is often calculated from length and breadth, assuming little variation in egg shape within species. However, egg shape may vary among females, over time, or within clutches. If this variation is not predictable, volume should be estimated using another method. For example, in some species, egg shape changes consistently with laying order and volume can be estimated using laying-order specific equations. We measured the length, breadth, volume, and mass of 249 Magellanic Penguin (Spheniscus magellanicus) eggs and regressed volume on length and breadth for first and second eggs separately. Differences between measured and calculated volume averaged 0.05) in

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