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The Mont Saint Michel Bay a new breeding site for two geographic morphs of white-spotted bluethroat Luscinia svecica namnetum and Luscinia svecica cyanecula La Baie du Mont Saint-Michel nouveau site de reproduction pour deux morphotypes de gorgebleue a miroir blanc Luscinia svecica namnetum et Luscinia svecica cyanecula



The Mont Saint Michel Bay a new breeding site for two geographic morphs of white-spotted bluethroat Luscinia svecica namnetum and Luscinia svecica cyanecula La Baie du Mont Saint-Michel nouveau site de reproduction pour deux morphotypes de gorgebleue a miroir blanc Luscinia svecica namnetum et Luscinia svecica cyanecula



Alauda 672: 81-88



Bluethroat is a widely distributed Eurasian passerine with many different geographic races. In France, the breeding ranges of two morphs Luscinia svecica namnetum and L. s. cyanecula, which are mainly differentiated by their wing-length, has increased since the 1980's. Since 1997, the Mont Saint-Michel Bay constitutes a new breeding site for bluethroats. Wing length measurements revealed that both morphs are present in this population. The Mont Saint-Michel Bay can therefore be considered as a contact zone, which outlines a northwards expansion of L. s. namnetum and southwards expansion of L. s. cyanecula. Data collected for contact zones are very interesting to understand mate choice and its influence on subsequent population evolution.

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Related references

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