Butterfly Islands: Afton Down

Showing posts with label Afton Down. Show all posts

Wednesday 13 April 2022

First Green Hairstreak & Grizzled Skipper at Freshwater.

A well known site for first of the season sightings is Whiteways Quarry,now a National Trust carpark at the foot of Afton Down close to Freshwater Bay. As explained many times in this blog the grassy area at the back of the carpark has a interesting number of species especially in the spring.

Today's visit produced a first Green Hairstreak of the year. It was seen on the flowering Spanish Bluebells,just like the individual in the photograph below. Unfortunately I only sighted it on two brief occasions and it failed to return again ,probably due to the cloudy conditions. Also present were possibly two Grizzled Skippers. Another first for this season

Saturday 1 May 2021

More New Spring Sightings

The month of April was very dry with cold winds from the north and east and temperatures well below average for the time of year. However things are due to change as May begins with rain and wind in the forecast after the weekend. Hopefully warmer weather will soon be on the way. Today continued the April theme and when the sun shone it was very pleasant as I returned to the landslip. Descending the steps onto the landslip I at once saw a male Wall Brown on the cliff slope and that was quickly followed by two more. Unfortunately the sun then disappeared behind shower clouds and the only other species seen were a Dingy Skipper, Small Copper, and a Peacock.

Returning to the foot of Afton Down, it was pleasing to record the first Small Blue of the year with four individuals. Green Hairstreak were again present along with a very pristine male Common Blue.

Saturday 11 July 2020

First Chalk-hill Blue on West High Down.

At this time in July we can expect the first Chalk-hill Blue on West High Down.High Down is owned by the National Trust, extending eastwards from the Needles to Freshwater Bay and includes Tennyson Down.The emergence of the Chalk-hill seems to be later here than on other Isle of Wight downland and I saw just one male today, whereas in different locations numbers are rapidly increasing.Along with this blue there were several Dark Green Fritillaries nectaring on giant thistles.They too are a common downland butterfly here and have no doubt been on the wing for some time.

Tennyson Down left,Afton Down & Compton Bay distant

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.