Polyommatus coridon (Poda, 1761)


Polyommatus coridon: Male (eastern Swabian Alb, Southern Germany, August 2010) [N] Polyommatus coridon: Male (eastern Swabian Alb, Southern Germany, July 2011) [N] Polyommatus coridon: Adult (eastern Swabian Alb, Southern Germany, July 2011) [N] Polyommatus coridon: Male (eastern Swabian Alb, August 2013) [N] Polyommatus coridon: Male [N] Polyommatus coridon: Female [N] Polyommatus coridon: Female [N] Polyommatus coridon: Female (eastern Swabian Alb, Southern Germany) [N] Polyommatus coridon: Male lower side [N] Polyommatus coridon: Male [N] Polyommatus coridon: Female [N] Polyommatus coridon: Mating (eastern Swabian Alb, August 2013) [N] Polyommatus coridon: Mating (eastern Swabian Alb, Southern Germany, August 2010, Eilema lutarella on the same flower) [N] Polyommatus coridon: Mating [N] Polyommatus coridon: Fresh deposited ovum, Swabian Alb, Southern Germany August 2009 [N] Polyommatus coridon: Ovum [M] Polyommatus coridon: Egg in winter (Swabian Alb, Southern Germany, 09/02/2008) [N] Polyommatus coridon: Young larva (eastern Swabian Alb, May 2013) [M] Polyommatus coridon: Half-grown larva (eastern Swabian Alb, May 2013) [M] Polyommatus coridon: Half-grown larva (eastern Swabian Alb, May 2013) [M] Polyommatus coridon: Half-grown larva (eastern Swabian Alb, May 2013) [M] Polyommatus coridon: Half-grown larva (eastern Swabian Alb, May 2013) [M] Polyommatus coridon: Half-grown larva (eastern Swabian Alb, May 2013) [M] Polyommatus coridon: Half-grown larva (eastern Swabian Alb, May 2013) [M] Polyommatus coridon: Larva [M] Polyommatus coridon: Larva (eastern Swabian Alb) [M] Polyommatus coridon: Larva resting under Hippocrepis at daytime (eastern Swabian Alb, late June 2012)  [M] Polyommatus coridon: Larva resting under Hippocrepis at daytime (eastern Swabian Alb, late June 2012) [M] Polyommatus coridon: Pupa [S] Polyommatus coridon: The pupae are also often observed under the Hippocrepis pads (eastern Swabian Jura, late June 2012) [M] Polyommatus coridon: Larval habitat on the eastern Swabian Alb (late June 2012) [N] Polyommatus coridon: High-density habitat with Hippocrepis comosa on the eastern Swabian Alb, Southern Germany (2011). [N]

Host plants:
The larvae feed on Hippocrepis (especially Hippocrepis comosa) and rarer also Coronilla varia.

Habitat:
Polyommatus coridon colonizes all kinds calcareous grasslands from the lowlands up to about 2100m.

Life cycle:
Polyommatus coridon flies in one generation from late June or more often early July to October. Eggs are laid close to the ground on stems and leaves of Hippocrepis, but often also on moss, lichens and other plants (leaf underside of Helianthemum and Potentilla) near Hippocrepis pads. The caterpillar overwinters in the egg. The nocturnal caterpillar is often found in the dozen under Hippocrepis-pads and can cause defoliation in the end of May and in June.

Endangerment factors:
Polyommatus coridon is in decline due to habitat loss. But on the other hand it is still obviously only little threatened. Limestone-grasslands have declined significantly and are still in further decline, but Polyommatus coridon is able to reproduce in even small ones. For example, it lives almost in all the limestone juniper grasslands of the Swabian Alb, and is also common in the Alps. But in regions with traditional low alkaline grassland stocks, the isolated populations often collapse like they did in the southern German Iller valley due to dense afforestations and further affections of the former floodplains.

Remarks:
Polyommatus coridon is distributed from Northern Spain and southern England across large parts of Europe (excluding Scandinavia) to the Urals.



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