Butterfly - Peacock, Inachis io - postcard c.1980s

Postcard
• Picture / Image:  Peacock Butterfly (Inachis Io)
• Publisher:  Avon Nova Graphics - British Butterflies 1st series
• Postally used:  no - message but not posted
• Stamp:  n/a
• Postmark(s): n/a
• Sent to:  n/a
• Notes / condition: 

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Text from the free encyclopedia WIKIPEDIA may appear below to give a little background information (internal links may not  work) :

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The European Peacock (Inachis io), more commonly known simply as the Peacock butterfly, is a colourful butterfly, found in Europe and temperate Asia as far east as Japan. Classified as the only member of the genus Inachis (the name is derived from Greek mythology, meaning Io, the daughter of Inachus). It should not be confused or classified with the ""American peacocks"" in the genus Anartia; these are not close relatives of the Eurasian species. The Peacock butterfly is resident in much of its range, often wintering in buildings or trees. It therefore often appears quite early in spring. The Peacock butterfly has figured in research where the role of eye-spots as an anti-predator mechanism has been investigated.^[1]

In the British Isles, the butterfly is found in England, Scotland (including Orkney and Shetland), Wales, and Ireland. The Peacock is expanding its range^[2][3] and is not known to be threatened.^[2]

The butterfly has a wingspan of 50 to 55 mm. The base-colour of the wings is a rusty red, and at each wingtip it bears a distinctive, black, blue and yellow eyespot. The underside is a cryptically coloured dark-brown or black. There are two subspecies, I. io caucasica (Jachontov, 1912) found in Azerbaijan and I. io geisha (Stichel, 1908) found in Japan and the Russian Far East.

The Peacock can be found in woods, fields, meadows, pastures, parks, and gardens, and from lowlands up to 2,500 metres (8,200 ft) elevation. It is a relatively common butterfly seen in many European parks and gardens. The Peacock male exhibits territorial behaviour, in many cases territories being selected en route of the females to oviposition sites.^[4]

The butterfly hibernates over winter before laying its eggs in early spring, in batches of up to 400 at a time.^[3] The eggs are ribbed and olive-green in colour and laid on the upper parts, and, the undersides of leaves of nettle plants^[5] and hops. The caterpillars, which are shiny black with six rows of barbed spikes and a series of white dots on each segment, and which have a shiny black head, hatch after about a week. The chrysalis may be either grey, brown, or green in colour and may have a blackish tinge.^[5] The caterpillars grow up to 42 mm in length.

The recorded foodplants of the European Peacock are Stinging Nettle (Urtica dioica), Hop (Humulus lupulus), and the Small Nettle (Urtica urens).^[3]

The adult butterflies drink nectar from a wide variety of flowering plants, including buddleia, willows, dandelions, wild marjoram, danewort, hemp agrimony, and clover; they also utilize tree sap and rotten fruit.

Inachis io employs a monandrous mating system, which means that they only mate with one partner for a period of time. This is due to their life cycle in which female are receptive only available during an eclosion period, after overwintering. The pairs only mate once after overwintering, as it is very difficult to find a receptive female after that period.^[6] In species where the range of the females is not defensible by a male, the males must defend a single desirable area that females will come through, such as dense food areas, watering holes, or favorable nesting sites. The males then attempt to mate with the females as they are passing through. Holding a desirable territory increases the male’s likelihood of finding a mate and therefore increases his reproductive success. However, each individual needs to weigh the benefits of mating with the costs of defending a territory.^[7] Inachis io exhibits this type of territorial behavior, and must defend a desirable territory from other males. If only one of the males knows the territory well, he will successfully chase off any intruders. On the other hand, if both males are familiar with the territory, there will be a contest between the two to determine which of them stays in the territory. The most desirable sites are those that will increase the male’s quota of females. These sites are generally feeding and oviposition sites, which are sough after by females. This territorial behavior is reinforced by the fact that these sites are all concentrated. If the valuable resources were dispersed, there would be less observable territorial behavior.^[8] In order to find mates and defend their territory, Inachis io exhibits perching behavior.The male butterflies will perch on an object at a specific height where they can observe passing flying objects. Every time they see a passing object of their own species or of a relevant species, they will fly straight towards the object until they are approximately 10 cm away. If they encounter a male, the resident male will chase him off his territory. If the resident male encounters a female, he will pursue her until she lands and mating will occur.^[9] The courtship is extended in this species. The male goes through a long chase before the female allows him to mate. He must demonstrate high performance flight.^[10]         

The monandrous mating system has caused the evolution of a shorter life span in males of this species. In polygynous butterflies, the male’s reproductive success is largely dependent on life span. Therefore, the longer a male lives, the more he can reproduce, so he has a higher fitness. Therefore, males tend to live as long as the females. In Inachis io the synchronous eclosion at the end of winter cause males to only mate once. Their reproductive success is therefore not linked to how long they live, and there is no selective pressure to live longer. Therefore, the life span of males is shorter than the lifespan of the females.^[6]

type=printed postcards

theme=animals

sub-theme=butterflies

number of items=single

period=1945 - present

postage condition=unposted