Anyone with spare roof space in Edinburgh could help a pioneering conservation project to provide new homes for the capital's once elusive butterfly, The Northern Brown Argus as well as other butterfly species.
It is seeking to establish an aerial network of rooftop habitats. Already signed up are the famous malt whisky Glenmorangie’s headquarters along with the Scottish Parliament building at Holyrood.
A ‘Square Metre for Butterflies’ is a partnership between the Royal Botanic Garden Edinburgh (RBGE) and Butterfly Conservation Scotland. The aim of the joint project is to plant patches of common rock rose, the favourite food plants of the butterfly caterpillars, creating 'green roofs' around Arthur’s Seat and further afield. This should encourage the existing population in the Royal Park to expand and colonise in the newly created habitats.
The Northern Brown Argus is Edinburgh’s butterfly. For years it existed on Arthur’s Seat with Scottish butterfly watchers in the 1700s assuming it was just a slightly different version of the Brown Argus which it closely resembles. But in 1793, closer inspection revealed that it was a completely new species.
After its discovery the Northern Brown Argus became a highly-prized addition for collectors. It disappeared by 1869 due to over-zealous collecting and land use changes at Holyrood, including the building of a road through the last remaining population strongholds of the species.
In 2005, the species was rediscovered at Holyrood and the population has continued to increase year on year.
Leonie Alexander, urban biodiversity project officer at RBGE, explained: “We are creating the network of green roofs across Edinburgh to encourage the population of Northern Brown Argus to expand into new areas. Green roofs are perfect because the butterfly is usually found living at height and these roofs will provide warmth, food and shelter in the city.
“We are also hoping to attract at least two other species, small copper butterflies and blue butterflies, by providing plants that caterpillars will feed on. The project will be closely monitored so we will know how successful it is and what species are attracted to the green roofs.’’
Anthony McCluskey, urban butterfly project officer with Butterfly Conservation Scotland, said: “It’s remarkable that this scarce species lives so close to the city. We’re excited to be welcoming Edinburgh’s butterfly back to the city centre, and hope that it inspires people to make more space for these beautiful creatures."
Ian Mackenzie, living landscape programmes manager at the Scottish Wildlife Trust, said: “Green roofs are launch pads for all kinds of butterflies and wildlife to make connections across the city. Using the ‘Square Metre for Butterflies’ project to boost these connections will show how we can build nature into our future plans. For the health and wellbeing of our city we need projects like this that put nature at its heart.”
Hamish Torrie, corporate social responsibility director for Glenmorangie said the company had a long-standing commitment to the natural environment across all of its sites "and we are delighted to support this initiative.”
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