NDLI: Migratory behaviour of Blackcaps Sylvia atricapilla wintering in Britain and Ireland: contradictory hypotheses

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Migratory behaviour of Blackcaps Sylvia atricapilla wintering in Britain and Ireland: contradictory hypotheses

Content Provider	Semantic Scholar
Author	Busse, Przemysław
Copyright Year	1992
Abstract	Busse P. 1992. Migratory behaviour of Blackcaps (Sylvia atricapilla) wintering in Britain and Ireland: contradictory hypotheses. Ring 14, 1-2: 51-75. There was observed clearly pronounced growth of population of Blackcaps wintering in Britain and Ireland. These winterers are of continental origin. The problem is in causes of the phenomenon -firstly the migratory behaviour involved and secondly, mechanisms leading to positive selection of individuals belonging to the group migrating from central Europe to the British Isles. Migratory behaviour model, called here "direction shift model", proposed by Berthold and Terrill (1988) is discussed and alternative "reverse migration model" is proposed. The latter assumed that most of the autumn continental immigrants to the British Isles reach them by reverse track of normal migration directed to three winter-quarters. After arrival they reorient migration to backward track or, if they are interpopulational hybrids, change direction according to other inherited navigation programme. Minority of immigrants already is at reoriented track, after reorientation at Norwegian coast. British winterers originate from both simple reverse migrants, but mainly from a stock of reoriented birds. The model is built on reanalysis of accessible ringing data and confirmed by the results of winter counts of wintering Blackcaps and the data from field navigation experiments reported elsewhere. P.Busse, Bird Migration Research Station, University of Gdansk, Przebendowo, 84-210 Choczewo, Poland.
File Format	PDF HTM / HTML
Volume Number	14
Alternate Webpage(s)	http://www2.sbwp.ug.edu.pl/wp-content/uploads/2016/03/BUSSE1992A.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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