Butterfly Islands: April 2023

Saturday, 29 April 2023

Butterflies Respond to the Warmer Weather.

Following a cloudy start to the day ,this afternoon was sunny and warmer with a brisk breeze. And the butterflies responded with another new spring species at Whiteway's. The single Green Hairstreak has now been joined by another of the same and that can be confirmed by the different underside markings,as seen below. The other new arrival today was this Grizzled Skipper shown in the following photo.

Friday, 28 April 2023

A Slow Start to the Spring Emergence.

With the first appearance of the Green Hairstreak at Whiteway's on the 23rd of this month,I would have expected to see other spring species following very soon afterwards at this site. However to date the Green Hairstreak is still a lone occupant. As the weather is now it seems improving, I am hopeful that everything will quickly catch up.

With little new to see at Whiteway's today I visited Bouldnor Forest and all was quiet with just four species on show. Brimstone male's were evident along with this female resting on a bramble in the sun. Several Speckled Wood were recorded as well as a first Comma sighting of the year.

Sunday, 23 April 2023

A First Spring Butterfly on the Wing.

Persistent visits to Whiteways at Freshwater Bay finally paid off today with a first spring butterfly sighting of the year. This single Green Hairstreak was observed feeding on the usual flowering plants that are found at the site.

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.