Polyommatus argus (Linnaeus, 1758)


Polyommatus argus: Male (Swabian Alb, Southern Germany, June 2009) [N] Polyommatus argus: Male (eastern Swabian Alb, Southern Germany) [N] Polyommatus argus: Male (Swabian Alb, Southern Germany, June 2009) [N] Polyommatus argus: Male (Swabian Alb, Southern Germany, June 2009) [N] Polyommatus argus: Male [N] Polyommatus argus: Male (Northern Greece, Askio mountains, May 2011) [N] Polyommatus argus: Adult (Spanish west Pyrenees, Aisa, July 2011) [N] Polyommatus argus: Female (Swabian Alb, Southern Germany) [N] Polyommatus argus: Female [N] Polyommatus argus: Mating (Swabian Alb, Southern Germany) [N] Polyommatus argus: Male lower side [N] Polyommatus argus: Male (Swabian Alb, Southern Germany, June 2009) [N] Polyommatus argus: Female [N] Polyommatus argus: Ovae (Photo: Mario Peluso) Polyommatus argus: Young larva [S] Polyommatus argus: Larva, green form [M] Polyommatus argus: Larva [M] Polyommatus argus: Pupa [S] Polyommatus argus: Habitat: Fabaceae-rich, warm, nutrient-poor grassland on the eastern Swabian Alb, Southern Germany, where also Pyrgus alveus occurs. [N] Polyommatus argus: Habitat in a disturbed bog (Calluna stage) in the northern foreland of the Alps (2012) [N]

Host plants:
The caterpillar feeds on Fabaceae, Ericaceae (e.g. Calluna) and Cistaceae (e.g. Helianthemum). On the Swabian Jura it lives mostly on the Fabaceae Lotus, Coronilla and Hippocrepis.

Habitat:
Polyommatus argus can reproduce in various habitat types such as hot calcareous grasslands, acidic heathlands, moors and clearcuttings.

Life cycle:
The adults fly in a single generation in June and July. Only in the warmest regions (about the Upper Rhine) or in the south there are also present two generations from May to early September. The caterpillar overwinters in the egg shell and is mature in the end of May or in early June. During the day, it can sometimes be found under the plants on the earth in the moss and litter.

Endangerment: regionally endangered or decreasing

Endangerment factors:
Polyommatus argus is threatened by eutrophication of the habitats, succession and direct habitat destruction, but still occurs at the moment at many sites thanks to its not very special requirements.

Remarks:
The distribution extends across large areas of the Palearctic (Europe and temperate Asia to Japan).



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