Butterfly Islands: May 2020

Monday, 18 May 2020

Back on the Landslip & Back to Nature.

The month of May is of course the time for the Glanville Fritillary here on the Isle of Wight.Now that restrictions have been relaxed, a short car ride to Afton Down Chalkpit and a walk down to the National Trust clifftop at Compton Chine provided access to the landslip.Descending the impressive wooden steps onto the landslip I was treated to a view along the coast towards Compton Bay.

Today the Glanville Fritillary was in evidence on the clifftop and below, although due to the brisk onshore wind they were very active and jittery.Nevertheless,find a sheltered spot and many butterflies could be approached as they rested in the sunshine or nectared on the flowering thrift. Among the other species on show were Common Blue,Dingy Skipper,Small Heath,Small Blue and Brown Argus.

Thursday, 14 May 2020

Out and About At Last.

Following seven weeks of lockdown it was great to get out and enjoy nature.Today's first visit of the year to Bouldnor Forest at Yarmouth was rewarded with a Glanville Fritillary nectaring on bird's-foot trefoil. Other species encountered along the forest rides were Wall Brown,Green Hairstreak,Grizzled Skipper,Small Heath,and Speckled Wood.All were recorded as my first of the season.

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.