SONGS OF BLUE TITSPARUS CAERULEUS PALMENSISFROM LA PALMA (CANARY ISLANDS)—A TEST OF HYPOTHESES
作者:
BRIGITTE SCHOTTLER,
期刊:
Bioacoustics
(Taylor Available online 1995)
卷期:
Volume 6,
issue 2
页码: 135-152
ISSN:0952-4622
年代: 1995
DOI:10.1080/09524622.1995.9753280
出版商: Taylor & Francis Group
关键词: Canary Island;blue tits;island colonization;drift event;character divergence;song-learning
数据来源: Taylor
摘要:
Parus majorandParus caeruleus palmensishave some song types in common. They consist of whistled element-types in different frequency ranges. Both species show territorial reactions to playback of the song-types belonging to the other species.P.c. palmensisdoes not share any songtypes with Central EuropeanParus caeruleus.This is confirmed by playback experiments with the different song types, which do not elicit any territorial behaviour. The songs ofP.c. palmensisalso differ from those of blue tits from any other Canary Island. They may be derived from contact calls of the Lanzarote population. They have been developed by young birds that had not yet learnt their songs when they colonized La Palma from Lanzarote without reaching any of the other Canary Islands. It is suggested that the uniform song repertoire was developed by adapting the already learned contact calls to each other. The similarities to song types ofP. majorare due to convergence rather than character displacement. All other Canary Island tit populations share the main features of their songs, which are characterized by quick frequency changes. It seems most likely that these islands have been colonized by birds which had already learnt their songs. Differences in song repertoires are mainly caused by drift events which happen to occur because of population bottlenecks during the colonization process.
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