EurekaMag.com logo
+ Site Statistics
References:
53,214,146
Abstracts:
29,074,682
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

The magnetic compass of blackcaps sylvia atricapilla


Behaviour 68(1-2): 24-30
The magnetic compass of blackcaps sylvia atricapilla
During autumn and spring migration 1975-1977 the non visual orientation of blackcaps (S. atricapilla) was analyzed. Blackcaps were able to get orientational information from the local geomagnetic field (0.46 Gauss, mN 360.degree., 66.degree., incl. [inclusive]). When magnetic north was turned by 180.degree. to geographic south by reversing the horizontal component of the earth magnetic field, they changed their directional preferences according to this artificial magnetic field (0.46 Gauss, mN 180.degree., 67.degree., incl.). When the horizontal and the vertical components of the magnetic field were reversed (0.46 Gauss, mN 350.degree., -60.degree., incl.), blackcaps had a mean direction which is equivalent to that in the normal earth field. In a partly compensated magnetic field which could not be used for orientation, no significant directional preference was found (0.34 Gauss, mN 360.degree., 60.degree., incl.). Blackcaps were able to get oriental information from the magnetic field-not by the polarity of the magnetic field, but by the interpretation of the inclination of the axial direction of the magnetic field lines in space. They use an inclination compass, as it was described for european robins, to obtain information. During spring migration, the individual test birds showed directional preferences about 180.degree. opposite to the directions they had preferred in autumn. The headings of the individual birds suggest that a mixed population of southeast- and southwest-migrants was tested.

(PDF same-day service: $19.90)

Accession: 006712851

DOI: 10.2307/4533940



Related references

The use of crown coloration for ageing male blackcaps Sylvia atricapilla Lus de la coloracio del capell en la datacio del tallarol de casquet Sylvia atricapilla mascle. Butlleti del Grup Catala d'Anellament. 1995( ); 12: 5-6, 1996

Remarkable records of blackcaps Sylvia atricapilla Bemerkenswerte Funde beringter Monchsgrasmucken Sylvia atricapilla. Jahrbuecher des Nassauischen Vereins fuer Naturkunde, 118: 123-124, 1997

Wintering blackcaps Sylvia atricapilla in Denmark Vinterforekomst af Munk Sylvia atricapilla in Danmark. Dansk Ornitologisk Forenings Tidsskrift, 962: 67-74, 2002

The magnetic field as reference for the innate migratory direction of blackcaps, Sylvia atricapilla. Naturwissenschaften 83(9): 430-432, 1996

The morphology of sardinian warblers sylvia melanocephala and blackcaps sylvia atricapilla resident on gibraltar. Bulletin of the British Ornithologists' Club 101(2): 299-304, 1981

An investigation into the breeding territories of blackcaps Sylvia atricapilla and garden warblers Sylvia borin. Northamptonshire Bird Report, 56-59, 1993

The influence of light intensity on the migratory restlessness of garden warblers and blackcaps sylvia borin and sylvia atricapilla. Journal fuer Ornithologie 118(3): 268-281, 1977

An experimental test of competition for space between blackcaps sylvia atricapilla and garden warblers sylvia borin in the breeding season. Journal of Animal Ecology 52(3): 795-806, 1983

Fuel deposition and potential flight ranges of blackcaps Sylvia atricapilla and whitethroats Sylvia communis on spring migration in The Gambia. Ornis Svecica, 64: 137-144, 1996

Wintering blackcaps, Sylvia atricapilla. Fauna, Oslo, 23: 135, 1970