Butterfly Islands: Valezina

Showing posts with label Valezina. Show all posts

Saturday, 8 July 2017

Good Season for Silver-washed.

It seems to be an excellent season for the Silver-washed Fritillary. Good numbers are to be seen in our woodlands and if lucky the odd female Valezina form could turn up.It is estimated that one in seven females have this attractive appearance.

Tuesday, 27 June 2017

Summer Butterflies Enjoy the Bumper Bramble Bounty.

There were a prolific number of butterflies at Walters Copse today.The most impressive were the Silver-washed Fritillaries and the White Admirals.These and many other species were busily feeding on the bramble flowers that seem to be abundant in the copse this year.Although male and female Silver-washed were on show I was not lucky enough to see the female Valezina. In the south of England it is estimated that up to 15% of the females are of this beautiful form.

Sunday, 15 November 2015

Top Highlight of 2015.

The past season has thrown up several exciting sightings, such as the close encounter with White-letter Hairstreaks on an elm in Newport town centre,the joy of seeing the valezina form of the Silver-washed Fritillary in numbers at Porchfield,and finding a colony of Lesser Spotted Fritillaries on the beach on the Greek Island of Thassos. However the best must be the discovery of Glanville Fritillary pupae or chrysalies on the Island back in May.Here the habitat for this fritillary is unique as the continental Glanvilles frequent meadows,riverbanks,and woodland clearings.On the Isle of Wight it is a butterfly of our cliffs and clifftops.Therefore finding a spot to pupate can mean under stones or rocks and this is the place where these chrysalises were found.As normal they use a strand of silk to attach themselves to their chosen stone where it will take up to three weeks to emerge as an imago.

Sunday, 26 July 2015

Back to Normal.

The Silver-washed Fritillary is a majestic butterfly of our woodlands in the summer months.The male is a strong flyer along our woodland glades stopping on feed at bramble flowers. The female on the other hand can sometimes be seen flying in the shade of oak trees seeking a suitable place to lay her eggs at the base of the tree.

As they mature the female Silver-washed develop a slight green tinge to their upper wings.This can vary intensity and the female pictured below has a significant greening of her wings.Unlike the valezina form it does not extend to all the upper side.

Male Silver-washed.

Saturday, 25 July 2015

On the Lookout for Something Special.

In the south of England including the Isle of Wight up to 15% of female Silver-washed Fritillaries occur in the beautiful form of valezina. These females are olive-green in colour with an underside of washed pink.This individual pictured below was spotted today in a nearby copse enjoying the ample bramble flowers.

Sunday, 21 July 2013

On the Lookout for Valezina in Walters Copse.

I have to go back to the 1970's to recall my last sight of the valezina form of the Silver-washed Fritillary.This rather beautiful form is found mainly in central and southern England and occurs in up to 15% of the females.There was no shortage of the usual coloured Silver-washed Fritillaries in Walters Copse today together with plenty of White Admirals.Making my way to where I understand the valezina has been sighted in the Copse recently I came across an individual high up on a bramble bush.After observing it for some time nectaring on the flowers it suddenly flew off pursued by a male.Somewhat farther on and in a sunny spot of oak trees fronted by brambles I was treated to a mating pair of Silver-washed not too high up in the tree.I was very pleased to see that the female was a valezina.They remained locked together on an oak leaf and to my amazement another valezina appeared close by and started to enjoy the bramble flowers.Two in one day,a very lucky day.

The Adonis Blue

The Large Tortoiseshell

It seems the general view on the status of the Large Tortoiseshell in Britain is that it is now extinct as a breeding butterfly.
It is a butterfly of woodland edges and hedgerows that abound in willows,elms,and poplars.These trees are used by the adult to lay its eggs and this single brood appears in July and August.The emerging butterfly then hibernates over the winter in log piles and hollow trees until the next spring.
On the Isle of Wight sightings are more often than not made from early March to April.Have these butterflies overwintered on the Island or have they come from the continent where it is common?
Any sightings made in July/August pose the same question.Another explanation could be that captive-bred releases are responsible.Only the discovery of eggs and caterpillars will probably answer these questions.

I can now report that evidence has been found of breeding just along the coast at Portland in Dorset (June 2020) and again at the same location in the summer of 2021.

The Glanville Fritillary

This elegant butterfly is mainly confined to the crumbling undercliffs and chalk downs of the Isle of Wight.It is also found on the Channel Islands and at one or two isolated colonies on the British mainland.In Britain the Glanville Fritillary is at the extreme north-western edge of its range.On the continent it is readily found in flowery habitats.
Around the southern shores of the Isle of Wight the cliffs constantly erode causing them to slip away and provide perfect conditions for new growths of the butterflies laval host plant,Ribwort Plantain.
The eggs are laid to the underside of the leaves of this plant and normally hatch after about three weeks.The resulting caterpillars live together in communal webs spun over the plantain.In the autumn they hibernate and recommence feeding in the spring,eventually dispersing to prepare for pupation.
The adult butterfly is on the wing from May to the end of June with the female being larger than the male.They will feed on,amongst other things, Birds-foot Trefoil and Thrift.

The Wall Brown

On the Isle of Wight in particular,the Wall Brown is a butterfly of field edges,coastal cliffs and dunes,and rabbit-grazed downland.
The male is territorial and spends much of the time patrolling and basking on the ground.
The female,which lacks the males conspicuous dark sex brand across the forewings,is larger.The undersides of both sexes are beautifully cryptic when at rest.
The Wall Brown generally produces two broods a year,the first from late April until late June and the second from mid-July to mid-September.