SPATIAL PROXIMITY BETWEEN ALLIES: A TERRITORIAL SIGNAL TESTED IN THE MONOGAMOUS DUET SINGER COSSYPHA HEUGLINI by HENRIKE HULTSCH and DIETMAR TODT1) (Abt. Verhaltensbiologie, Inst. f. Allg. Zoologie, Freie Universität Berlin, Germany) (Acc. 15-V-1984) Introduction The permanent pairbonds and year-round territoriality of many tropical song bird species will have been favoured by intraspecific competition if pairs are more successful than single individuals in the maintenance of territories. The antiphonal duetting which many of these species developed has been interpreted as a territorial display signalling a cooperating pair to outsider birds (THORPE & NORTH, 1965; TODT, 1970, 1975; THORPE, 1972; SEIBT & WICKLER, 1977; VON HELVERSEN, 1980). To date there is little experimental evidence on whether the multifold non vocal constituents of duet displays, like e.g. coordinated body and wing movements and close perching of mates, are also playing a role in territory defense. Rather, these have been viewed as to serve some in- trapair function (WILEY, 1975; WENDENBURG, 1978; TODT & FIEBELKORN, 1979; ToDT et al., 1981; TODT & HULTSCH, 1982). Often, territorial behaviours, like vocal duetting, display flights and attacks are preceded by mates showing up together. Since the distance to which two individuals tolerate each other might
Behaviour – Brill
Published: Jan 1, 1984
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