INHERITANCE OF A POPULATION-SPECIFIC MOLT BY CROSS-BREEDING BLACKCAPS(SYLVIA-ATRICAPILLA) OF DIFFERENT POPULATIONS

Citation
P. Berthold et al., INHERITANCE OF A POPULATION-SPECIFIC MOLT BY CROSS-BREEDING BLACKCAPS(SYLVIA-ATRICAPILLA) OF DIFFERENT POPULATIONS, Journal fur Ornithologie, 135(2), 1994, pp. 233-236
Citations number
8
Language
TEDESCO
art.tipo
Article
Categorie Soggetti
Ornithology
Journal title
ISSN journal
0021-8375
Volume
135
Issue
2
Year of publication
1994
Pages
233 - 236
Database
ISI
SICI code
0021-8375(1994)135:2<233:IOAPMB>2.0.ZU;2-D
Abstract
A comparative study of migratory blackcaps from Central Europe (S. Ger many) and resident conspecifics from the Cape Verde Islands revealed m arked differences in annual periodicity. European blackcaps, with one breeding season per year, have a single-peaked annual gonadal cycle wh ereas the African birds with two breeding seasons per annum have a two -peaked gonadal cycle- The European birds go through a post-juvenile m oult (partial moult in first-year birds) or postnuptial moult (complet e moult in adults) and, in addition, through a partial winter moult (a ll age classes) before the next gonadal cycle and breeding season. The ir African conspecifics, on the other hand, have only one moult betwee n two gonadal cycles, the summer moult also being the complete one- He re, we demonstrate that the ''additional' winter moult of European bla ckcaps is heritable and can be transmitted into interpopulational hybr ids. When blackcaps from S. Germany and the Cape Verdes were cross-bre d, 16 out of 21 hybrids displayed the partial winter moult of their Ge rman parents. The fact that not all but only 76 % of the F1 hybrids pa ssed through this moult favours the idea that its incidence is control led by a polygenic rather than a single locus system. Most likely wint er moult in European blackcaps represents a threshold character as sev eral migratory features do.