Behavior of crested auklets (<Emphasis Type="Italic">Aethia cristatella</Emphasis>, Charadriiformes,Alcidae) in the breeding season: Visual and acoustic displays |
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Authors: | V A Zubakin I A Volodin A V Klenova E V Zubakina E V Volodina E N Lapshina |
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Institution: | 1.Severtsov Institute of Ecology and Evolution,Russian Academy of Sciences,Moscow,Russia;2.Russian Bird Conservation Union,Moscow,Russia;3.Biological Faculty,Moscow State University,Moscow,Russia;4.Moscow Zoo,Moscow,Russia |
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Abstract: | The crested auklet, a highly social planktivorous bird species of the Northern Pacific, is an important component of marine
ecosystems. Although visual and acoustic modalities play a major role in the communication of these birds, the available data
on the repertoire of their vocal signals and postures are scarce and lack quantitative analysis. This study deals with visual
and acoustic displays of crested auklets on their breeding grounds and the occurrence frequencies of certain forms of social
behavior in male and female birds. The data were collected on Talan Island (the Sea of Okhotsk) in 1987–1991 and 2008. They
show that the rate of contacts between birds is very high and sex-specific: on average, males initiate 1.13 contacts/min,
compared to 0.65 contacts/min initiated by females. Directionality of ruff-sniff displays differs depending on the posture
of the recipient bird. The duration of the trumpeting display in males depends on their social surroundings. However, the
duration of either the trumpeting display or the mutual cackling display during courtship is independent of the behavioral
context. Vocalization of crested auklets is characterized by two independent basic frequencies occurring either sequentially
or simultaneously. The role of different communicative modalities in the behavior of the crested auklet is discussed. |
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