Butterfly Islands: Elm tree.

Showing posts with label Elm tree.. Show all posts

Wednesday, 26 June 2019

White-letter Hairstreaks Back at Towngate.

A visit to the elm tree at Towngate in Newport on the 24th June discovered several male White-letter Hairstreaks high in the branches.Today a prolonged watch resulted in a probable male nectaring on cow parsley and at least one female laying eggs on the lower branches of this disease-resistant elm.

Friday, 15 June 2018

White-letter Hairstreaks at Towngate.

I first noticed a White-letter Hairstreak flying near to the top of the Towngate elm tree last Tuesday the 12th June.Unfortunately none decided to investigate the lower branches at the time.I had better luck today as after a patient wait at least two hairstreaks came to eye level.The advantage of this site is a footbridge that spans the stream below.The elm is planted on the bank of the stream and therefore standing on the bridge gives access to the branches halfway up the tree.(See last years blog entry)

Tuesday, 11 July 2017

White-letter Hairsreaks Still Busy.

Yesterday as I observed the elm that has been home to White-letter Hairstreaks for the last three seasons I was fortunate to see a female wandering along a branch in search of buds on which to lay her eggs.This carried on for some time as she fluttered onto other branches in pursuit of more buds.

Tuesday, 20 June 2017

Early Return for White-letter Hairstreaks.

This year the season seems to be at least two weeks early and many of the summer species are on the wing sooner than expected. The White-letter Hairstreak is no exception as normally they would not be seen until July.

At Newport the colony of White-letter Hairstreaks were counted in almost double figures and it is pleasing to know that this is the third year in succession that they have been recorded here.The photo below shows the disease resistant elm ( the smaller tree on the right) where these butterflies have made their home.Unlike many sites where it is normal to gaze up at the Hairstreaks from ground level the adjoining foot bridge gives an excellent vantage point.

Wednesday, 20 July 2016

Back In Town.

The White-letter Hairstreak colony discovered last year on a disease resistant elm in Newport is still going strong. The first individual was spotted about two weeks ago and today several females were seen on the lower branches.This particular elm was planted around the time of the millennium and last season was the first time that any hairstreaks were recorded on the tree.

Friday, 3 July 2015

A Red-letter Day.

The White-letter Hairstreak is a secretive butterfly and relies on the elm tree for its life cycle.Therefore disaster struck when in the 1970s Dutch Elm Disease decimated millions of British elms.Fortunately,the caterpillar can survive on new sucker growth and their recovery has been helped too by the dedicated work of local wildlife and butterfly conservation volunteers who have planted disease resistant elms.

So it was a great day today when I had the opportunity, for the first time, to see these lovely little butterflies.An eagle-eyed friend of mine had seen butterfly activity around such a resistant elm and as they tend to spend much of their time towards the top of the tree obtaining good views of this Hairstreak is difficult.However my luck was in today as several individuals descended to the lower branches to seemingly investigate the elm tree buds.

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.