Recensio Critica Automatica of the Doctrine of Bird-Migration
Recensio Critica Automatica of the Doctrine of Bird-Migration
Ottó Herman
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The breeding-places have an influence on the Migration-routes of the species, but not exclusively and not for all species; for the majority of continental Birds a change in the breeding-places must be considered as a normal phenomenon. 5. The Migration-routes change in the course of time either in connexion with changes in the distribution of the species: or in connexion with changes in the oro-geographical cha- racter. 6. The routes of the autumn and spring Migration are not always the same ; ...in some cases the difference between spring and autumn ca 43 ea 6* Digitized by Google THESES FROM LITERATURE. migration along the same road is marked by the different number of migrating individuals. 7. In the phenomenon of migration no unimportant part is played by imitation, the chasing among different species, the assembling in herds of young birds, the similarity of colour etc. 8. The inherited knowledge of the Migration-routes and the expe- rience gained by the successive generations leads in some regions to a shortening of the original route, reducing the route to only determined directions of Migration.
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