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Titre :	[Occurrence of Herons and Bitterns Ardeidae in the Franconian Pond Area from 1950 to 2000]
Auteurs :	Manfred Kraus, Auteur ; Werner Krauss, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (40(1) April, 2001)
Article en page(s) :	1-29
Résumé :	Since 1950 3657 observations of 28,770 individuals Ardeidae have been recorded in the Franconian Pond Area. 56% of the observations refer to Grey Heron, followed by Little Bittern, Bittern, Great White Egret, Purple Heron, Night Heron, Little Egret, Cattle Egret and Squacco Heron. The population trends of Little Bittern, Great White Egret and Grey Heron correspond well with the supraregional trends. 1. Bittern: Migratory bird and guest almost annually for 150 years, as breeding bird (since 1850) with 1-3 pairs at 4 sites over periods of changing length. Lately stronger preference for wintering here. 2. Little Bittern: The occurrence of breeding birds and migratory birds are subject to great fluctuation as in the 19th century: in the nineteen-fifties and nineteen-sixties there was a dense population with a daily maximum of 20 birds, however, 1977 to 1996 there were in 6 years only 0-1 findings. In the middle of the nineties numbers increased again. Observations from May (April) to September (October). 3. Night Heron: Since 1950 records of 77 observations from March to September in 24 years. Main occurrence in August. Day maximum of 3 individuals. No proof of breeding. 4. Squacco Heron: Since 1955 (previously in 1947) evidence of 34 observations between May and September in 17 years. Day maximum of 3 individuals. 5. Cattle Egret: Since 1968 records of 37 observations between April and November in 11 years. 6. Little Egret: Since 1962 evidence of 34 observations from April to October of 1-2 individuals in

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