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Photographer's Note

Polyommatus (Agrodiaetus) humedasae

Toso & Balletto 1976

Vulgar name: Milleocchi Humedas

Family: Lycaenidae

Length mm front wing. 16-19

Notes: the plant association of the habitat where the species lives is Festucetalia vallesiacae (Stipo-Poioncarniolocae); apparently adults focus on abandoned fields of alfalfa. The schists ofiolitiferi constitute the geological substratum of the site. The population structure is probably closed. Although it seems probable that other breeding sites in addition to well-known, there is no evidence in this regard. The population density appears to be reasonably high, with an average of 11 individuals / hectare, and at least 110 individuals present within a month. Even in the absence of a specific study, it is estimated a total population of some thousands of adults. Typically males hatch before females, which survive longer in season. It was not observed any kind of territorial behavior in males. The depositions begin in mid-August, and peak in the following week. According to a laboratory study (Manino et al., 1987), the hatched begin in mid-September. The larva feeds for a few weeks, then he goes into hibernation in the litter at the base of the plant. The power supply resumed in mid-April and the first move, always at the level of litter, occurs in mid-May. The larval stage ends in mid-June. The pupation takes place in the litter and images emerge after 20-25 days. The food plant of the caterpillars is Onobrychys mountain. Adults feed on Medicago sativa, ochroleucum Sedum spp. montanum and Onobrychys mountain. The larvae are cared by Tapinoma kinds of ants, and lasis Myrmica. Like many other Lepidoptera, P. humedusae is linked to the environments ecotonal: abandoned fields of alfalfa are subject to invasion by plant species of trees, and thus ultimately give way to the woods. This would cause the disappearance of the species, because they have never been observed individuals attending the surrounding woods. Also it seems unlikely that the species is able to colonize new habitats spontaneously. In addition to these factors of natural character, the indiscriminate collected by collectors can not be neglected: Ballet (1993) reported the presence of several people a day in the biotope, personally have been four times for a short time, not more than six hours overall, but I have not met anyone. In the first two times The Roman bridge was impassable for work in progress so I limited my exploration to a single side, encountering a single copy. The second time I have met a dozen copies, only one of which beyond the bridge. Based on the above, it is desirable for a better protection of rare species.

Male: dark brown with darker veins. Basal area and disc of the forewings with a visible fuzz androconiale.

Female :. Similar to the male but generally smaller and hairless androconiale. Taken discocellulare dark in anterior wings.

Reverse: light brown. Forewings with traits discocellulari and points of series postdiscale blacks outlined in white. Rear designs blacks more minutes.

Distribution: the only known site is a small area of a dozen hectares Pondel, in Cogne Valley - Val d'Aosta.

Habitat: xerothermophile species. The species is found in the meadows of the mountain plain from 800 up to about 1000 meters above sea level

Annual generation: with a flicker of adults in July and August.

Suckler plants: Onobrychis montana.

ikeharel, ourania, pierrefonds, danos, cornejo trouve(nt) cette note utile

Photo Information
  • Copyright: Silvio Sorcini (Silvio1953) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 16519 W: 130 N: 34136] (190297)
  • Genre: Lieux
  • Medium: Couleur
  • Date Taken: 2015-07-11
  • Categories: Nature
  • Exposition: f/11, 1/500 secondes
  • More Photo Info: view
  • Versions: version originale
  • Date Submitted: 2015-09-24 5:48
Viewed: 1251
Points: 40
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Additional Photos by Silvio Sorcini (Silvio1953) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 16519 W: 130 N: 34136] (190297)
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