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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	National census of colonial breeding Herons in France 2007: Grey Heron, Purple Heron, Blackcrowned-Night-Heron, Squacco Heron, Cattle Egret, Little Egret, Great White Egret
Titre original:	National census of colonial breeding Herons in France 2007
Auteurs :	Loïc Marion, Auteur
Type de document :	Article
Dans :	Alauda (77 janvier 1, 2009)
Article en page(s) :	243-268
Résumé :	The 9th National Census of tree breeding Herons colonies in France (7 species) occurred in spring 2007 (completed in 2008) thanks to a network of more than 787 observers belonging to 100 organisations, coordinated by Loïc MARION. The total number of nests reached 66 096 distributed in 1914 species-colonies (in 1387 sites). The Grey Heron was the more abundant (31 138 nests in 1236 colonies), but is levelling-off (+4,89% since 2000). The Purple Heron stopped its decline by increasing by 46% with 2828 nests in 192 colonies. However, the population of the Dombes had to be estimated (390 nests in 50 colonies) due to lack of census. The Black-crowned Night Heron, which also still largely winters in Africa, decreased to 3355 nests in 142 colonies, a drop of 20% in spite of increasing its number of colonies by 60%. Although also migrating, the Squacco Heron pursued its increase (108%) with 576 nests, albeit in only 18 colonies, 11 of which are in the Camargue, then largely limited its range in France. Thanks to the lack of long cold spells along the coasts since 1987, the Cattle Egret was still increasing (by 94%) with 14098 nests in 111 colonies, also in the large majority distributed in the Camargue and Languedoc-Roussillon, but it has pursued its expansion on the Atlantic coast up to Brittany and bred even in Normandy. The Little Egret, although benefiting from the same conditions, showed a limited increase (near 10%) with only 13 727 breeding pairs in 221 colonies, but still extended along the coasts up to Normandy. Finally, the Great White Egret, which appeared as a breeder at Lac de Grand-Lieu in 1994, is now well established, having formed new colonies in Loire-Atlantique and increasing its numbers in the Camargue and in the Somme where only isolated pairs bred before. This species now totals about 180 nests in 13 colonies in France.

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