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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Why each of the Lesser Spotted Eagles Aquila pomarina in Brandenburg counts: results of a population simulation.
Auteurs :	Joerg Boehner, Auteur ; Torsten Langgemach, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (125(3-4) 2004)
Article en page(s) :	271-281
Résumé :	Monitoring data for the Lesser Spotted Eagle Aquila pomarina in the federal state of Brandenburg (Germany) since 1994 indicate a slight but significant population decline. We used a computer programme (Vortex) to calculate which values of certain population parameters correspond best to the current development, and, in a second step, to simulate the effects of changes in reproduction and mortality. The results indicate that already an increase in breeding success of 7-10% would stabilise the population at the present level. Currently, this proportion corresponds to the annual number of 2-3 pairs which fail to breed successfully due to human interference in a broad sense. Therefore, land owners, foresters, and agencies involved in landscape development can contribute to the recovery of the population by making sure that the specific requirements of the species at the breeding site are met, most important a lack of disturbance. The results also indicate that a further decline in reproductive output would speed up the current negative development. A similar effect would be caused by a yet increasing mortality on migration, mainly due to shooting, whereas lowering this rate by just a few percent would already stabilise the, population at the current level. To achieve this goal, however, international efforts are necessary, especially in the eastern Mediterranean. Provided, that optimal breeding habitat is available and human persecution on migration ceases, a population increase could effectively be supported by a management that prevents the killing of the younger sibling by its older nest mate, and, therefore, results in two fledglings per successful pair. 5 additional juveniles gained annually in this way would cause an increase of about 50% within 25 years.

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