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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Reproductive ecology of the Cattle Egret (Bubuicus ibis) at Sidi Achour, north-eastern Algeria (2007)
Auteurs :	Farrah Samraoui, Auteur ; Rachid Menai, Auteur ; Boudjema Samraoui, Auteur
Type de document :	Article
Dans :	Ostrich (78(2) June, 2007)
Article en page(s) :	481-487
Langues:	Anglais
Mots-clés :	Algérie
Résumé :	The reproductive ecology of the Cattle Egret (Bubulcus ibis) in a monospecific colony was monitored in 2003 at Sidi Achour, north-eastern Algeria. A set of physical characteristics were quantified to investigate their influence on breeding success. Prior to hatching, roughly one-third of the nests were subjected to vandalism in one single incident, which highlighted the anthropogenic influence on the reproductive success of Cattle Egrets breeding close to urban areas. Mean clutch size was 3.10 +/- 0.13 eggs per nest (n = 31 complete clutches). The mean clutch size did not vary significantly when lost clutches were taken into account: 2.99 +/- 0.09 eggs per nest (n = 86 nests). Clutch size, which exhibited a marked seasonal decline, correlated marginally with nest diameter and height above water but not with the location of a nest within a colony (central or peripheral). Hatching success for complete clutches was high (83.0%) and an average of 2.29 +/- 0.18 chicks per nest survived to 12-15d of age. Growth curves of developing nestlings were estimated from repeated measurements of mass, tarsus, head and beak length, and wingspan. The last chicks (C- and D-chicks) to hatch had lower growth rates and/or survivorship than the first (A-) or second (B-) hatched chicks.

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