Butterfly Islands

Friday, 6 July 2018

Butterflies After Water in our Drought-like Weather.

In Bouldnor Forest there is a collection of scrape-like ponds which are a remnant of oil exploration.They have become home for several species of dragonfly and now a water source for butterflies in this prolonged dry spell.It is maybe not unusual to see butterflies at damp patches in order to access salts, but it is always good to see a species that is not easily seen on the ground.This Purple Hairstreak seems to be a regular visitor at this water source at present as one was seen at the same location a week ago.

The nearest oak trees are just a stones throw away,as can be noted in the photograph below.Other butterflies after moisture at the same time were a White Admiral and a Small White.

Thursday, 5 July 2018

Bridleway to West High Down.

From a small car park at the foot of the Down a bridleway leads up to West High Down where views of the spectacular Island coastline can be enjoyed to the south.To the north there is a panorama across to the village of Totland and beyond to the mainland.
It is on this path that I normally see my first Chalk-hill Blue of the summer, sheltered in the lee of the Down.However it seems that I am just too early as no Chalk-hills were seen here today. My visit did produce a first of the year sighting though.A Dark Green Fritillary had descended from its usual place on top of the Down to enjoy the many chalk loving flowers.

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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.