Observations on a hybrid between the whooper swan (<Emphasis Type="Italic">Cygnus cygnus</Emphasis>) and the mute swan (<Emphasis Type="Italic">Cygnus olor</Emphasis>) |
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Authors: | E N Panov E Yu Pavlova |
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Institution: | 1.Severtsov Institute of Ecology and Evolution,Russian Academy of Sciences,Moscow,Russia;2.Moscow Zoo,Moscow,Russia |
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Abstract: | The swan obtained by hybridization between Cygnus cygnus and C.olor was delivered to the Moscow Zoo from the Leningrad Zoo in 1989. Between 2002 and 2004, it permanently remained with a female
whooper swan in a large pond. The two swans behaved as a breeding pair, although the sex of the hybrid bird remained unknown.
We observed no courtship displays addressed by the hybrid swan either to the female whooper swan or to other swans living
in the pond. The hybrid swan was exteriorly closer to C. cygnus rather than to C. olor and showed increased aggressiveness. Its threatening behavior was intermediate between parental species in terms of threat
displays and motor activity, although behavioral patterns characteristic of C.olor prevailed. The most frequent sounds in the vocal repertoire of the hybrid swan were close to the vibrant throbbing call of
C.olor in terms of duration and frequency range. In contrast to these sounds, the call of the hybrid swan was noiselike, with distinct
harmonic structure (as in the whooper swan except for extremely narrow interharmonic intervals). These vocal signals of the
hybrid swan were shown to be intermediate between those of the parental species. In addition, the acoustic repertoire of the
hybrid swan included rarely emitted sounds closely resembling elements of vocalizations of both C. cygnus and C. olor. |
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