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  • Form and function of aerial courtship displays in black storkes Ciconia nigra = Oblika in funkcija dvorjenja črnih štorkelj Ciconia nigra v zraku
    Sackl, Peter
    Hitherto unknown aerial courtship displays of Black Storks Ciconia nigra recorded for the most part during population surveys in northern and eastern Austria between 1979-1991 are described. Aerial ... displays were seen mainly during early stages of the breeding cycle in April till mid-May (Fig. 1). Theyare characterized by mates soaring tight together in a highly synchronizedmanner above the nest-site or in other parts of the home range (Parallel Soaring). Additionally, melodious Hight calls are given by both partners and the white undertail-coverts are widely spread. Occasionally soaring birds were seen whiffling or performing simultaneous darting flights (Fig. 3). According to (1) the regular participation of both breeding partners, (2) their regular performance around nest sites and/or within home ranges, (3) their largely restricted occurrence during early stages of the breeding cycle as well as (4) by their specific pattern of stereotyped and elaborated behavioural elements (Parallel Soaring, Displaying the Undertail-Coverts, Flight Calls, Whiffling and Darting Flights) ceremonial Aights in Black Storks may generally operate as highly ritualised courtship flights. Thus, analogous to aerial displays in other large forest-living birds- like in many raptors - they may help in pointing out nest-sites to potential mates, stimulate pair formation and assist in spacing by discouraging other birds from settling close. The highly elaborated courtship Hights in Black Storks seem to be unique within the "typical" storks of the tribe Ciconiini and coincide with the solitary nesting habit of the species within the closed canopies of heavily wooded areas.
    Vir: Acrocephalus : glasilo Društva za opazovanje in proučevanje ptic Slovenije = journal of Bird Watching and Bird Study Association of Slovenia. - ISSN 0351-2851 (Letn. 21, št. 102/103, 2000, str. 223-229)
    Vrsta gradiva - članek, sestavni del
    Leto - 2000
    Jezik - angleški
    COBISS.SI-ID - 13128153

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    Digitalna knjižnica Slovenije - dLib.si

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