Butterfly Islands: Circus Maximus.

Wednesday 2 November 2016

Circus Maximus.

The site of ancient Rome's chariot racing stadium,Circus Maximus is in the centre of the city between the Palatine and Aventine Hills.It measured over 2000 feet in length and just under 400 feet in width and today is a public park.During a short stay in the city last weekend,I was pleased to see at least eight species of butterfly here as I strolled along the grassy banks of the Circus that in the days of the Roman Empire could accommodate well over 100,000 spectators.Quite a selection of wild plants grow here and they still attract butterflies at this time of year,especially in the warm sunshine that we enjoyed on our visit.

Whites were numerous,such as Bath,Large and Small White,together with several Clouded Yellow that all flew along the slopes searching out the small flowers, while Common Blue,Small Copper,Small Heath,Mallow Skipper,and Geranium Bronze seemed to find their own spot amongst the grass and plants.

The grassy slopes of the Circus Maximus

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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.

Wednesday 2 November 2016

Circus Maximus.

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