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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Distribution, population development and habitat of Lesser Spotted Eagle Aquila pomarina in Mecklenburg-Vorpommern, NE Germany.]
Auteurs :	Wolfgang Scheller, Auteur ; Erhard Franke, Auteur ; Joachim Matthes, Auteur ; Martin Neubauer, Auteur ; Christian Scharnweber, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (122(5) 2001)
Article en page(s) :	233-246
Résumé :	The breeding distribution of Lesser Spotted Eagle in Mecklenburg-Vorpommern is restricted to the eastern part of the region. While the western boundary has remained unchanged at least since the 1970s, the other boundaries have retracted slowly, a process that still continues. In the 1990s, there were 89-97 breeding pairs of Lesser Spotted Eagles in Mecklenburg-Vorpommern, inhabiting an area of 7030 km2. The overall density was 1.3-1.4 pairs/100 km2. However, pairs were found to be clustered in five more or less clearly defined areas with densities of 1.3-2.8 pairs/100 km2. The highest local density was 8.0 pairs/100 km2 (on 237 km2). The average nearest neighbour distance between active nests was 3425 m, within the high density areas it ranged between 2517 m and 4623 m. Except for the former district of Rostock, where there was a possible population increase during the 1990s, abandoned sites outnumbered immigration or resettlement in the other areas. Thus the overall number of pairs has slightly declined. The continuing abandonment of nest sites, frequently unsuccessful immigration, and a loss of breeding areas indicate an increasing instability of the population. The reproductive output of 0.69 fledlings per breeding pair (i.e. 0.51 fledlings/territorial pair) is similar to that in other European breeding areas. There was a long-term decrease in reproductive output in the well-researched area of the former district of Rostock. The rate of non-breeding pairs in Mecklenburg-Vorpommern changed over the years, averaging 23% of the total number of pairs in the 1990s. Ongoing habitat degradation is primarily due to intensification of forestry and agriculture, natural succession of grassland or its conversion to arable land (loss of food resources) and to increased disturbance of previously secluded areas through improved infrastructure, traffic and tourism.

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