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- Title
Life-history of two AfricanSylviawarblers: low annual fecundity and long post-fledging care.
- Authors
Schaefer, Hans-Christian; Eshiamwata, George W.; Munyekenye, Fred B.; Böhning-Gaese, Katrin
- Abstract
The investigation of factors that cause differences in life-history traits between temperate and tropical birds is often hampered by a lack of knowledge about tropical species. Even within the well-known warblers of the genusSylvia, which include resident species from temperate and tropical regions as well as migrants, there are few data from tropical species. We investigated the breeding biology of the tropical speciesSylvia lugensandS. boehmiin a 2-year study in Kenya. Both species had a clutch size of 2.0 and laidc. 3.7 clutches per year. Breeding was characterized by long incubation periods (S. lugens14.5 days,S. boehmi15.0 days), long nestling periods (16.0 and 12.9 days, respectively) and high predation rates (Mayfield nest successS. lugens33.2%,S. boehmi19.4%). Annual fecundity was 2.3 fledglings inS. lugensand 1.4 fledglings inS. boehmi. After fledging, the young birds were fed for 37.5 days (S. lugens) and 58.5 days (S. boehmi) (time to independence) and they stayed in their parents’ territory for days or weeks, even after feeding had stopped. Fledgling survival until independence was 55.4% inS. lugensand 69.2% inS. boehmi. In general,S. lugensandS. boehmihave smaller but more numerous clutches, longer developmental periods, higher nest predation rates, lower annual fecundity and longer post-fledging care than their temperate congenerics.
- Subjects
KENYA; SYLVIA (Birds); FERTILITY; IMMIGRANTS; SYLVIIDAE; BARRED warbler
- Publication
Ibis, 2004, Vol 146, Issue 3, p427
- ISSN
0019-1019
- Publication type
Article
- DOI
10.1111/j.1474-919X.2004.00276.x