Variability in breeding parameters of the Squacco HeronArdeola ralloides

Autor:	Heinz Hafner, Yves Kayser, Karine Delord, Christophe Barbraud
Rok vydání:	2003
Předmět:	Avian clutch size Animal science Nest biology Ecology embryonic structures Squacco heron biology.organism_classification Ecology Evolution Behavior and Systematics Body condition Brood Nature and Landscape Conservation
Zdroj:	Bird Study. 50:300-305
ISSN:	1944-6705 0006-3657
DOI:	10.1080/00063650309461323
Popis:	Capsule Breeding parameters and body condition of chicks varied with colony sites. Aims To investigate variations of breeding parameters and chick body condition. Methods In 2000, marked nests (n = 86) were surveyed weekly at four colonies and each nestling was measured and weighed. Nest survival probabilities during the egg and nestling periods were estimated, and the number of fledglings per breeding attempt were estimated and compared between colonies. Results The mean clutch size of all colonies combined was four eggs but varied significantly (Kruskall–Wallis = 10.4, P = 0.01) between colonies. Daily nest survival probabilities during the egg and nestling periods were constant across colonies and were 0.983 (± 0.005 se) and 0.999 (± 0.009 se), respectively. Nest survival during the entire breeding period was 0.7. The number of fledglings per breeding attempt was 1.8 (± 0.02 se) and varied between colonies. The body condition of chicks varied with colony site and size rank of chicks in the brood hierar...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ad415cf18ff4e2c93a144b428aaa63ff https://doi.org/10.1080/00063650309461323 Zobrazit plný text záznamu