COMMUNICATIVE-BEHAVIOR IN BREEDING OSPREYS (PANDION-HALIAETUS) - DESCRIPTION AND RELATIONSHIP OF SIGNALS TO LIFE-HISTORY

Citation
V. Bretagnolle et Jc. Thibault, COMMUNICATIVE-BEHAVIOR IN BREEDING OSPREYS (PANDION-HALIAETUS) - DESCRIPTION AND RELATIONSHIP OF SIGNALS TO LIFE-HISTORY, The Auk, 110(4), 1993, pp. 736-751
Citations number
57
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Ornithology
Journal title
ISSN journal
0004-8038
Volume
110
Issue
4
Year of publication
1993
Pages
736 - 751
Database
ISI
SICI code
0004-8038(1993)110:4<736:CIBO(->2.0.ZU;2-X
Abstract
The Osprey (Pandion haliaetus), although studied extensively, is relat ively unknown with respect to its behavior, especially communication. We conducted a two-year study on a resident Osprey population in Corsi ca, and describe the communicative behavior of this species. The behav ioral repertoire of Ospreys included 11 visual displays (resting, upri ght, alarm low and high, solicitation low and high, defense, protectio n, nest protecting, attack, and sky dance) and eight acoustic signals (alarm, solicitation low, high and very high, guard, excited, screamin g, and copulation calls). The meaning of each of the displays and call s was inferred from the analysis of behavioral sequences. The communic ation system of the Osprey consisted of sexual behaviors (between part ners), such as solicitation and sky dance, and agonistic behaviors (be tween breeders and nonbreeders), such as nest-protecting and defense p ostures. We also analyzed Osprey relationships with other species (inc luding man), and found that there was a gradation within alarm display s and alarm calls according to stimulus distance. In the last section, we try to account for several peculiarities of Osprey behaviors, name ly their complexity, the behavioral sexual dimorphism, and the importa nce of motivational displays. We suggest that all these characters may be related to the life-history traits shown by this species: semicolo niality, breeding strategy, and predation risk (on eggs and chicks).