Butterfly Islands

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.

Friday, 23 April 2021

A Promise of Spring on our Coastal Cliffs.

A walk along a very breezy clifftop today allowed me to access a section of the landslip close to Compton Bay. The coastline all along the south west of the Isle of Wight suffers from coastal slump as the cliffs periodically slide towards the sea. In fact evidence of recent slippages are for all to see along the path taken today.

It seems that only Small Copper butterflies were on show in this area of landslip this afternoon as I recorded at least six individuals. They were particularly fond of the odd clump of thrift, as just a few early flowers were to be seen dotted around. All too soon the cliffs will be covered in their bright pink blooms which are a favourite of the Glanville Fritillary which is due to make an imminent appearance.

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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.