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Status and trends of the Common Crane Grus grus on the western route

Published online by Cambridge University Press:  11 May 2010

J. M. Sánchez Guzmán ,
J. M. Avilés ,
F. J. Medina  and
A. Sánchez
J. M. Sánchez Guzmán
Affiliation:
Grupo de Investigación en Conservación, Área de Biología Animal, Universidad de Extremadura, 06071 Badajoz, España.
J. M. Avilés
Affiliation:
Grupo de Investigación en Conservación, Área de Biología Animal, Universidad de Extremadura, 06071 Badajoz, España.
F. J. Medina
Affiliation:
Grupo de Investigación en Conservación, Área de Biología Animal, Universidad de Extremadura, 06071 Badajoz, España.
A. Sánchez
Affiliation:
Dirección General de Medio Ambiente, Junta de Extremadura, Mérida.
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Summary

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The evolution of 40 wintering areas of Grus grus in the south-west of the Iberian Peninsula has been studied, including the traditional wintering places of this species on its western route. Eight of these areas harboured 50% of the whole population using this route, and none of the 40 areas showed a decline in the number of birds during the study period. At present the number of cranes in each area is much greater than in the 1979–1980 winter. No geographical trends have been observed regarding the magnitude of the increase, which is closely related to that observed for the whole Spanish and Palearctic populations. Despite the emergence of some new wintering areas, the magnitude of the increase is greater in more southerly parts of the range. This may be a consequence of greater diversity and availability of food in these latitudes. The influence of enhanced international protection and agricultural food sources on the appearance of new wintering areas is discussed.

Type
Research Article
Information
Bird Conservation International , Volume 8 , Issue 3 , September 1998 , pp. 269 - 279
Copyright
Copyright © Birdlife International 1998

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