|Scientific Name:||Polyommatus coridon|
|Species Authority:||(Poda, 1761)|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Assessor/s:||van Swaay, C., Wynhoff, I., Verovnik, R., Wiemers, M., López Munguira, M., Maes, D., Sasic, M., Verstrael, T., Warren, M. & Settele, J.|
|Reviewer/s:||Lewis, O. (Butterfly RLA) & Cuttelod, A. (IUCN Red List Unit)|
This species is listed as Least Concern, since it has not been declining by more than 25% in the last ten years, its European extent of occurrence (EOO) is larger than 20,000km² and its population size is probably larger than 10,000 adult individuals.
|Range Description:||Occurs in Central Europe. It is absent from Ireland, Scotland, Scandinavia, the Netherlands, the Iberian Peninsula (except northern provinces), the Mediterranean islands (except Corsica and Sardinia) and most of the south of Italy. Found at altitudes from 100-2,000 m. This is a European endemic species.|
Native:Albania; Andorra; Austria; Belarus; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia; Czech Republic; France; Germany; Greece; Hungary; Italy; Liechtenstein; Lithuania; Luxembourg; Macedonia, the former Yugoslav Republic of; Moldova; Montenegro; Poland; Romania; Russian Federation; Serbia (Serbia); Slovakia; Slovenia; Spain; Switzerland; Turkey; Ukraine; United Kingdom
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Although widespread in Europe, this species is local and restricted to areas with sufficient habitat of good quality. Strong declines in distribution or population size of more than 30% have been reported from Luxembourg, Ukraine, United Kingdom. Declines in distribution or population size of 6-30% have been reported from Austria, Belgium, Czech Republic, Germany, Lithuania, Romania and Spain (data provided by the national partners of Butterfly Conservation Europe).|
|Habitat and Ecology:||The Chalkhill Blue occurs on calcareous soil in dry and flower-rich places with a short vegetation. They seem to prefer sheltered places. Sometimes, populations can be extremely large which is especially obvious in the late afternoon when the butterflies come together to roost. Hundreds of butterflies can be seen, their heads pointing downwards into the vegetation, wings upright, the light-coloured underwings gleaming in the evening sun. Horseshoe Vetch (Hippocrepis comosa) is its only foodplant, the female laying her eggs on the leaves. The eggs hibernate. The caterpillars are attended by ants of the genera Myrmica, Lasius, Formica, Plagiolepis, Tetramorium, Aphaenogaster and Tapinoma. The Chalkhill Blue pupates in the litter layer. It usually only has one generation a year. Habitats: dry calcareous grasslands and steppes (35%), dry siliceous grasslands (13%), mesophile grasslands (13%), heath and scrub (5%), alpine and subalpine grasslands (5%), broad-leaved deciduous forests (5%).|
|Major Threat(s):||Although this species shows a decline in a part of its European range, it is not believed to face major threats at the European level.|
|Conservation Actions:||This species occurs in a number of protected areas across its range. No specific conservation actions are needed at a European level, but in countries where the species is in decline important habitats should be protected and managed. The effects of conservation actions should be monitored by a Butterfly Monitoring Scheme.|
Brereton, T. M., Warren, M. S., Roy, D. B. & Stewart, K. 2007. The changing status of the Chalkhill Blue butterfly Polyommatus coridon in the UK: the impacts of conservation policies and environmental factors. Journal of Insect Conservation 12(6): 629-638.
IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.1). Available at: www.iucnredlist.org. (Accessed: 10 March 2010).
Jutzeler D., Casula P., Gascoigne-Pees M., Leigheb G., Grill A. 2003. Confirmation du statut spécifique de Polyommatus gennargenti de Sardeigne comparé à Polyommatus coridon de la région de Schaffhouse par élevage parallèle. 2e partie. Linneana Belgica 19(4): 149-160.
Marchi A., Addis G., Exposíto-Hermosa V., Crnjar R. 1996. Genetic divergence and evolution of Polyommatus coridon gennargenti in Sardinia. Hereditas 77: 16-22.
Schmitt, T.; Gießl, A.; Seitz, A. 2002. Postglacial colonisation of western Central Europe by Polyommatus coridon (Poda, 1761); (Lepidoptera: Lycaenidae): evidence from population genetics. Heredity 88(1): 26-34.
Schmitt, T.; Krauss, J. 2004. Reconstruction of the colonization route from glacial refugium to the northern distribution range of the European butterfly Polyommatus coridon (Lepidoptera: Lycaenidae). Diversity and Distributions 10(4): 271-274.
Schmitt, T.; Seitz, A. 2002. Postglacial distribution area expansion of Polyommatus coridon (Lepidoptera: Lycaenidae) from its Ponto-Mediterranean glacial refugium. Heredity 89(1): 20-26.
Vandewoestijne, S.; Schtickzelle, N.; Baguette, M. 2005. A comparative demographic study of two characteristic calcareous grassland butterfly species: Cupido minimus and Lysandra coridon. In: Kühn, E., R. Feldmann, J.A. Thomas; J. Settele. (ed.), Studies on the ecology and conservation of butterflies in Europe. Vol. 1: General concepts and case studies. Conference Proceedings, UFZ Leipzig-Halle, December 2005 (Series Faunistica No 52), pp. 32. Pensoft, Sofia.
|Citation:||van Swaay, C., Wynhoff, I., Verovnik, R., Wiemers, M., López Munguira, M., Maes, D., Sasic, M., Verstrael, T., Warren, M. & Settele, J. 2010. Polyommatus coridon. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 06 December 2013.|
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