Ardea
Official journal of the Netherlands Ornithologists' Union

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Lebret T. (1948) Waarnemingen over leeftijdsgroepen bij Kolganzen, Anser a. albifrons (Scop.). ARDEA 36 (3): 198-200
In December 1947 Peter Scott and the present writer did field counts concerning the age ratio among the flock of some 2000 White-fronted Geese (Anser a. albifrons (Soap.)) on the salting ('dumble') at the southern bank of the tidal mouth of the River Severn near Berkeley in Gloucestershire. There were some 520 birds in juvenile dress, the average number of juveniles per pair being 3.8 or i.5. This makes 136 or 208 families which means 272 or 416 adult birds-with-young-ones. Hence the number of immature birds in full dress (in second and third year) + barren pairs may have amounted to 2000-(520 + 272) = 1208 birds or 2000-(520 + 416)= 1064 birds.


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