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BIBTEX RIS

Breeding success of the colonist species Bubulcus ibis (Linnaeus, 1758) and four native species

2005; Wiley; Volume: 86; Issue: 3 Linguagem: Inglês

10.1111/j.1463-6395.2005.00200.x

0001-7272

Maria Virgı́nia Petry, Vanda Simone da Silva Fonseca,

Plant and animal studies

Abstract This work evaluated the breeding success of Bubulcus ibis (Ardeidae), Egretta thula , Nycticorax nycticorax , Phimosus infuscatus and Plegadis chihi in Rio Grande do Sul during two consecutive nesting seasons. Mean clutch size for B. ibis was 2.59 in 1998/1999 and 2.49 in 1999/2000. The species with both the smallest and largest clutch was P. infuscatus , with 2.04 in 1999/2000, and 3.16 in 1998/1999. The highest mean number of nestlings per nest was 2.86 for P. chihi in 1998/1999 and the lowest was 1.85 for B. ibis in 1998/1999 and P. infuscatus in 1999/2000. In both nesting seasons all the species had major success, laying three eggs and raising two nestlings, exept for B. ibis . The breeding success for P. chihi varied from 1.54 young/nest in 1998/1999 to 0.4 in 1999/2000, whereas B. ibis ranged from 1.16 in the first period to 0.99 in the second.