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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Population development of the Ring-necked Parakeet Psittacula krameri in the Rhine-Neckar Region (Germany: Baden-Wurttemberg, Rhineland-Palatinate, Hesse), 1962-2008, in the context of its distribution in Europe
Auteurs :	Michael Braun, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (130(2) 2009)
Article en page(s) :	77-89
Résumé :	In 1855, the first breeding in Europe of the Ring-necked Parakeet was recorded in Norfolk, England. Since 1966 this species became established in Belgium, followed by the Netherlands (1968), Great Britain (1969), Germany (1969), France (1974), Italy (1970s), Spain (1982), Portugal (1986), and Greece (1992). The total European population is estimated at 29,000 individuals in 2008. In Germany, first breeding took place in Cologne (1969), subsequently followed by Worms (1974), Neckarhausen (1974), Wiesbaden (1975), Bruhl near Cologne (1975), Mainz (1970s), Bonn (1979), Dusseldorf (1984), Frankenthal (1985), Heidelberg (1990), Mannheim (1993), Ludwigshafen (1995), and Duisburg (2000). The total German population is estimated at 7,500 birds including c. 1,500 breeding pairs.For this study, more than 1,500 single observations from the Rhine-Neckar Region in southern Germany have been evaluated from own observations, literature and several public surveys. Since 1962, the Ring-necked Parakeet is living in different parts of this region. In 1974 local escapees started to breed both in Worms and Neckarhausen, independently. In both populations numbers were increasing, holding 30 birds each in 1983. Since 1985 the population of Neckarhausen started to spread into an area of 30 km(2). In the late 1980s and early 1990s new areas had been colonised from this nucleus, including the cities of Heidelberg, Schwetzingen and Mannheim. Oil the other hand, Frankenthal was found to hold a breeding population since 1985, either as an independent establishment or as a colonisation from Worms, By 1989, the parakeets also reached the city of Ludwigshafen via Frankenthal.By 2001, the total population between Mannheim and Heidelberg was estimated at 200 birds or 50-70 breeding pairs. In 2003, censuses at the roosts between Ludwigshafen and Heidelberg yielded about 1,300 birds, increasing to 1,600 individuals in 2004, both ill the post-breeding season. In 2005, an additional roost was found in Mannheim, leading to a total of nearly 2,300 birds. The population between Ludwigshafen and Heidelberg further increased to 2,400 birds (2006) and 2,900 birds (2007/08). From 2003-2008, the annual growth rate per roost site averaged at +14%. There are four main roost sites in the region, the maximum dispersal from the nocturnal roost site has been measured at 24 km. Parakeet sightings have been reported from 152 I-km-squares in the region until 2008 (Rhineland-Palatinate: 45, Baden-Wurttemberg: 106, Hesse: 1).

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