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Distribution et conservation du Damier de la Succise (Euphydryas aurinia) en Lorraine française (Lepidoptera, Nymphalidae)

Auteurs : Sardet (Éric) et Betremieux (Pierre-Alain)

Année de publication : 2006
Publication : Linneana Belgica
Volume : 20
Fascicule : 5
Pagination : 163-179

Résumé :

The rather alarming decline of the Marsh fritillary Euphydryas aurinia in the countries close to the Lorraine region in the NE of France has raised interest to the local nature conservatory body (Conservatoire des Sites lorrains). In order to prepare a strategy to protect this butterfly it decided to assist to a survey on the distribution and the ecology of the species. This has been achieved in 2002 and in 2003. 139 sites have been monitored of which 16 had not been visited since 1980, 19 other ones did not seem to harbour E.aurinia anymore, remaining 104 habitats where the butterfly has been found. The species is still rather common in the Lorraine region but its distribution is scattered. More than 80 % of the colonies occur on dry chalk terrain and hillsides flowered by Scabiosa columbaria, Knautia arvensis and sometimes Gentiana cruciata. Only few habitats in rather wet prairies with Succisa pratensis, another food-plant of the species, have been uncovered. Those sites are really endangered. About 56 % of the butterfly colonies are situated in places supervised by the above mentioned conservatory body and 53 % of them consist of limestone terrain, leaving only 3 % in the wet habitats with the devil's-bit scabious. Detailed measures of conservation based on field monitoring are proposed revealing tremendous fluctuations of the density of the host-plants. probably influencing the butterfly's frequency from year to year