Favourite Find of 2016.

The 2016  butterfly season in the UK has been disappointing with sightings down on recent years.The results of The Big Butterfly Count can be viewed here.I have found this trend too on my forays around the Isle of Wight this year.A noticeable lack of butterfly numbers in the common species that I would expect to see doing well as our summer  had good spells of warm,even hot weather.

I was pleased to see that the Newport town centre White-letter Hairstreaks were back on the elm tree where they were discovered in 2015.Along our southern seaside cliffs the Glanville Fritillaries seem to have had a good season too.

During my two visits to the Greek Islands in 2016 I had the treat of  seeing several Lang's Short-tailed Blues and that import from South Africa,the Geranium Bronze which has now spread all along the Mediterranean coast from Spain to Greece.An unexpected sighting was a colony of Lulworth Skippers among the wild flowers of an olive grove on Greek Island of Lefkada.A rare butterfly in the UK,only seen on the coastal cliff tops of Dorset.

However my favourite find was during May when a trip was made across the Solent to the New Forest in Hampshire to see the beautiful Pearl-bordered Fritillary.Now alas,gone from the Island since 2011 due to a lack of sustainable habitat at its last location in Parkhurst Forest.The particular New Forest inclosure visited on that day was named New Copse and despite the rather cloudy weather there were good numbers of these fritillaries on the wing.The habitat here is well managed  for the needs of the Pearl-bordered.

  

Up To West High Down.

At this time in the season a walk up to West High Down via a bridleway can be a chance to see the first Dark Green Fritillaries of the year.There was a report of two Dark Greens on nearby Brook Down a few days ago.However despite my best efforts none was in evidence today.

The bridleway that leads to the Down is sided by brambles and bushes to the north and more open ground to the south which perhaps are old quarry workings.Here, plenty of chalk downland plants grow and bloom which attracts a variety of butterflies due too to its sheltered aspect.The most common species today were Common Blue and Brown Argus although I was surprised to see a pristine Glanville Fritillary.It is somewhat out of its usual area which is a short way down the coast but they do get around and can turn up quite a way inland.As on the Down, there were good numbers of Large Skippers and I also came across a Small Tortoiseshell uploading salts from the track.

All Now in Top Gear.

That prolonged spell of cold and windy weather has seemingly passed and we are now enjoying very warm sunshine and light breezes.Needless to say that has produced great activity in the butterfly world.

A visit to Bonchurch this morning was rewarded with my first sighting of our Glanville Fritillaries,just two were spotted but numbers are expected to increase quickly in the sunshine over the next few days.Judging by the high count of caterpillars and webs earlier in the year it could well be a bumper year. Another new species for the season was the Common Blue,seen at the same location.This was followed by a walk on Bonchurch Down and after some searching we succeeded in seeing four Common Blue,a Small Copper,one Small Heath,and two Dingy Skippers.The latter two species were also first sightings of 2016.

The Holly Blue pictured below had just emerged and when the wings have developed,she would expect  to take to the air. 

 

Spring Gets Going.

Today the first adult Glanville Fritillary was seen here on the Isle of Wight at Wheelers Bay.Seemingly an early date for the first emergence as the weather has not been kind

I had confined myself to yet another visit to Whiteways in the hope of seeing the Dingy Skipper.Alas no luck,but a count of 3 Green Hairstreak including a mating pair,a Small Copper plus two male Small Blue having a aerial duel was an encouraging total.

Old and New.

The weather remains settled with plenty of sunshine.However at Wheelers Bay today that persistent easterly breeze prevented many butterflies from taking to the wing.Still,the warmth of the early afternoon did tempt out a Large White that fluttered past as I sat on a seaside bench.This must be a very early record for this species and it was soon followed by the discovery of a Small Tortoiseshell that had found a bare piece of ground to sun itself.

The Glanville Fritillary caterpillars seem to be progressing well with several large webs.Many caterpillars were out in the sun and hope is that this will be bumper season.

  

Out Enjoying the Sun.

After a frosty start to the day the sun shone in a near cloudless sky this morning.Once the Glanville caterpillars had warmed up they became active and proceeded to bask in the sun near to their web.These webs can have up to 150 individuals and are always close to their foodplant.Should a web with a large numbers of caterpillars exhaust its food supply ,they will move on in search of further Ribwort Plantain.

Defyng the Inclement Weather.

The caterpillars of our own Isle of Wight Glanville Fritillary have a lot to put up with.Their habitat is our coastal cliffs which bare the brunt of winter and spring storms that batter the south west shore of the Island.Still this butterfly is use to all that the weather can throw at it and continues to survive in its unique habitat.

Not surprisingly then, that this morning I came across several glanville webs in which the caterpillars remain until April when they disperse to find a suitable place to pupate.The weather today was particularly cold and wet so they congregate in the web for protection from the elements.On sunny days at this time of year they will become active around the web and feed on their food plant,Ribwort Plantain.

Further information on this special butterfly can be found  here.

Glanville caterpillars huddle up against the wet and cold weather.

Top Highlight of 2015.

The past season has thrown up several exciting sightings, such as the close encounter with White-letter Hairstreaks  on an elm in Newport town centre,the joy of seeing the valezina form of the Silver-washed Fritillary in numbers at Porchfield,and finding a colony of Lesser Spotted Fritillaries on the beach on the Greek Island of Thassos. However the best must be the discovery of Glanville Fritillary pupae or chrysalies on the Island back in May.Here the habitat for this fritillary is unique as the continental Glanvilles frequent meadows,riverbanks,and woodland clearings.On the Isle of Wight it is a butterfly of our cliffs and clifftops.Therefore finding a spot to pupate can mean under stones or rocks and this is the place where these chrysalises were found.As normal they use a strand of silk to attach themselves to their chosen stone where it will take up to three weeks to emerge as an imago.
  

That Looks Unusual....

It is always worth taking a closer look at even the common butterflies when out and about.There is a chance that you may be fortunate enough to come across an unusual individual or more correctly an aberration.Most species it seems are prone to aberration and some forms of aberration  are classified, but then again many are listed as unclassified.

For a comprehensive list and extensive information on recognized aberrations I would recommend a visit  to the excellent website  British  Butterfly Aberrations.

Red Admiral ab.bialbata. White spot on red band.

A Glanville Fritillary with more black than normal on upper hind wings

A Meadow Brown displaying loss of colour over much of its hind wing

A Dark Green Fritillary with extensive black on its upper wings.

Glanvilles All Over.

The Glanville Fritillary flight season is not all over as the title may suggest but they are all over our coastal cliffs.So it seemed today when I visited one of the Islands' several 'Chines.' This is the natural habitat for our Glanvilles, as these coastal cliffs stretch along the south-west coast of the Isle of Wight. It is here that erosion by the sea and wind  cause the sandstone to slip and create different levels of land as the cliffs slide towards the beach.On this landslip, pools and ponds form which in turn provide a home for dragonflies,such as the Keeled Skimmer.
The Glanville Fritillary will be on the wing throughout June.Some individuals are still emerging and can be seen in the company of many 'worn' adults.
   

Shepherds Chine near to the beach as the
 stream cuts through the sandstone cliffs.

Glanville habitat on the landslip

Visiting My Favourite Island Sites.

The prospect of a warm and sunny spring day encouraged me to visit a few of my favourite locations on the Island.First stop the National Trust owned Whiteways Quarry now a Viewpoint Carpark, commanding majestic views over our south-western coast.Here at the old quarry, a fantastic assortment of spring butterflies are protected by the shelter of Afton Down and today there was another new species to see.The Small Blue is our smallest butterfly and lives in very compact colonies.The males are usually the first to emerge and can be recognized by the dusting of blue scales on their upper wings.At least three were present today.Also here were a pair of mating Wall Brown butterflies.This species has declined in the UK over the years but can still be seen in good numbers on the Isle of Wight.

Leaving the carpark for a drive south along the coast to Wheelers Bay at Bonchurch, for another look at our Glanville Fritillaries which are the first in the country to appear at this location.Although at times the cloud shaded the sun today I counted four individuals.Many more will emerge along our southern coast during May.

Finally a steep walk up to Bonchurch Down that overlooks the village of Bonchuch and  the town of Ventnor.This south facing Down is one of the prime places on the Island for the spectacular Adonis Blue butterfly and a walk along the Downs' steep sides produced a first male Adonis.

Our Special One on the Wing.

Following several days of gale force winds along our Island coast,today we had just a lively breeze with plenty of sunshine.An ideal opportunity to see the newly emerged Glanville Fritillaries and an early start this morning produced one very new butterfly seeking a sheltered sunny spot away from the breeze.

Glanville Fritillary Pupae.

The first adult Glanville Fritillary butterfly of 2015 was seen on the Isle of Wight yesterday, the 4th May and hopefully during this month many more will emerge along our southern coast.

A sight that is not normally seen however is the fritillaries' pupal stage,particularly in the wild. Of course like other species of butterfly some are reared in captivity and sadly we have collectors from the mainland visiting our Glanville sites in the early spring to take caterpillars.So to discover pupae in their natural habitat is very satisfying and uncommon.

Once the full grown caterpillars have dispersed from their communal nest in April each will find a suitable place to pupate.The three pupae or chrysalises found today were attached by their pads of silk to the underside of small stones.Pupa length 13-14mm. This stage will last about three weeks.

Baywatch.

The sunny weather is still here and a visit to Wheelers Bay was a must today.The brisk breeze of the morning abated in the afternoon warmth and I was pleased to come upon two Common Blue butterflies.The first  a very bright blue male that I had already heard was on the wing at the Bay.The second a beautiful blue variety female with orange margins, rather than the normal brown colour of most females. The undersides of both sexes are similar but the female underside is slightly browner than the male.
As usual the Clouded Yellows were evident by their swift flight along the base of the cliff and I was lucky to be treated to the sight of a female helice form briefly flitting from dandelion to dandelion, before it flew on.

There are numerous references to Wheelers Bay on my blog with photographs of this coastal stretch between the town of Ventnor and the village of Bonchurch.
It is perhaps the best spot on the Island for butterflies as many species can be seen here throughout the season.With the Bays south facing position continental species do fly in over the Channel given favourable conditions.

The piece de resistance of this site however is the presence of the Glanville Fritillary that was encouraged to colonize here in the early 1990s because of a suitable habitat in which to breed.Although numbers at the Bay have fallen over the years due to some habitat loss it is the first place to see newly emerged Glanvilles in the UK.