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Breeding Biology of the Jabiru in the Southern Llanos of Venezuela
Publication Type: | Journal Article |
Year of Publication: | 1996 |
Authors: | González, JA |
Journal: | The Wilson Bulletin |
Volume: | 108 |
Issue: | 3 |
Date Published: | 1996 |
ISBN Number: | 00435643 |
Keywords: | Caracara, Caracara cheriway, Caracara plancus, Ciconiidae, Ephippiorhynchus, Ephippiorhynchus asiaticus, Ephippiorhynchus mycteria, Falconidae, Jabiru, Jabiru mycteria, Mycteria, Polyborus, Polyborus plancus, Venezuela |
Abstract: | I studied the breeding biology of the Jabiru (Jabiru mycteria) at Hato El Frío (state of Apure, Venezuela) during two breeding seasons. I located 22 nests during 1989-90 and 28 in 1990-91. Jabiru nests were 8-26 m from the ground in ten different species of trees, with Sterculia apetala the most commonly used (36.4% of the nests). Storks laid eggs between August and November. The greatest number of clutches were in September. Average clutch size was 3.4 eggs (range: 2-5; N = 17), with four eggs the most frequent clutch size. Fledglings left their nests in January or February at the age of 12-13 weeks but were still dependent of their parents for a period of up to two months. Nest success was 47.0% in 1989-90 and 47.6% in 1990-91; productivity (fledglings/active nest) was 0.94 and 1.00 respectively. In 1990-91, only 20% of eggs produced fledglings. Most nests (75%) failed during incubation. Main causes of nest failure were abandonment, nests falling, and predation by Crested Caracaras (Polyborus plancus). |
URL: | http://www.jstor.org/stable/4163719 |
Short Title: | The Wilson Bulletin |
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