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(Abstracts below)
Ligout; S, F Sebe & RH Porter (2004) Vocal discrimination of kin and non-kin
agemates among lambs. Behaviour 141: 355-369.
Kipper, S, R Mundry, H Hultsch & D Todt (2004) Long-term persistence of
song performance rules in nightingales (Luscinia megarhynchos): a
longitudinal field study on repertoire size and composition. Behaviour 141:
371-390.
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Abstracts
Ligout; S, F Sebe & RH Porter (2004) Vocal discrimination of kin and non-kin
agemates among lambs. Behaviour 141: 355-369.
Abstract: Playback experiments were conducted with 4 week old Ile-de-France
lambs (Ovis aries) to assess the role of auditory cues in social
discrimination. After being habituated to the test enclosure, lambs were
individually exposed to bleats from two stimulus individuals. Twin lambs
were tested with recorded bleats of their sibling versus an unfamiliar
agemate and single lambs with bleats of a familiar agemate versus an
unfamiliar lamb. Lambs responded more frequently to the bleats of their
sibling (for twin lambs) or of a familiar agemate (for single lambs) than to
those of an unfamiliar lamb. Such discriminative responses to the bleats of
familiar twins and non-kin lambs suggest that vocalizations may be a
sufficient basis for social recognition. Acoustic analyses of the playback
bleats revealed significant differences between the signals from the
different stimulus lambs and suggest that fundamental frequency may be an
important parameter of lambs' individual vocal signatures.
Kipper, S, R Mundry, H Hultsch & D Todt (2004) Long-term persistence of
song performance rules in nightingales (Luscinia megarhynchos): a
longitudinal field study on repertoire size and composition. Behaviour 141:
371-390.
Abstract: Common nightingales (Luscinia megarhynchos) are among those bird
species that possess an extremely large repertoire and perform it in a
versatile singing style. Thereby, repertoire size, composition, and
performance differs considerably among individuals. In this longitudinal
field study, we investigated the long-term stability of these differences in
the song characteristics of free-ranging nightingales. We determined the
repertoire characteristics for nine adult male individuals in two successive
years (three of these individuals were investigated over the course of three
years) and compared these to similar measurements obtained from comparisons
of song samples of different birds. Comparisons revealed remarkable
differences among males, but we did not find systematic differences in the
song performance of birds in successive years. Instead, song characteristics
were remarkably stable within successive years. The long-term persistence of
individual song characteristics suggests that they are not related to
dynamically changing individual attributes, but may reflect long-term
storage of information during song acquisition as juveniles. In addition, we
found that the repertoire performance of adult nightingales allows
fine-tuned vocal interactions among several neighbouring males.
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