Butterfly Islands: March 2017

Saturday, 25 March 2017

On The Up.

A further visit to Walters Copse today saw an increase in butterfly sightings compared with a fortnight ago despite a brisk easterly wind.However in some spots of the copse it was sheltered away from the cool breeze and became relatively warm in the sunshine.Best of all was the number of Brimstone, reaching double figures as the males patrolled the rides on the lookout for females.Occasionally they took time out to visit the many primrose plants that now bloom throughout the copse.Unfortunately I did not encounter any new spring emergents, as the only other butterflies on the wing were Peacock and Commas.

Sunday, 12 March 2017

Warm Temperatures Bring On the Butterflies.

We enjoyed above average temperatures yesterday on the Island and it was most likely the warmest day of the year so far.Therefore,I was not surprised to see my first butterfly of 2017 sunning itself on the ground in my garden.No doubt this Peacock had just come out of hibernation and was after some nutrition.It soon flew onto a daffodil where it began to nectar.
After lunch I made a short car ride along the coast and visited one of the numerous Chines that are found here to see the state of Glanville Fritillary caterpillar webs that dot the sides of the coastal cliffs.With the sunshine warming up these grassy knolls caterpillars were evident although at this time they are small,only 6mm or so in length.By late April they will have grown considerably and will begin to disperse from their communal webs to find place to pupate.

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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.