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A Mathematical Expectation Model for Bird Navigation based on the Clock-and-Compass Strategy

✍ Scribed by HENRIK MOURITSEN; OLE MOURITSEN

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
179 KB
Volume
207
Category
Article
ISSN
0022-5193

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✦ Synopsis

We present here a mathematical formula for the directional distribution of migratory birds if they use a vector navigation/clock-and-compass strategy to "nd their winter quarters. It is based on mathematical expectation theory and shows that a simple parabola can describe the expected geographical spread of clock-and-compass birds as a function of migratory distance. Predictions based on this model are then tested against all same autumn ringing recoveries of "rst-season Pied Flycatchers, Ficedula hypoleuca, ringed in Scandinavia and European Robins, Erithacus rubecula, ringed in Sweden and Finland and recovered north of the Sahara Desert. We "nd that the predictions of our analytical model "t the ringing recovery distribution of freely migrating conspeci"cs extremely well.

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