The popularity of Scotland's mountains with climbers poses serious conservation issues, according to a study.

The study, published by Scottish Natural Heritage (SNH), said tourism remained vital to the Highlands' economy.

But it also said human pressure on vulnerable areas of land would have to be dealt with.

The issues raised were being discussed at an international mountains conference in Pitlochry this week.

There are challenges ahead for natural and wild places

Des Thompson SNH

Scotland's Mountains: Key Issues for Their Future Management, was published in association with the Centre for Mountain Studies and the International Year of Mountains.

It surveyed landowners, members of the public, members of the John Muir Trust (JMT) and the Mountaineering Council of Scotland (MCoS).

Landowners who took part said recreation was a primary function on mountainous land.

'Refreshing' report

The research revealed climbers travelled an average of 112 miles to use the mountains, with the Cairngorms their favourite destination.

JMT and MCoS members visited the Cairngorms most frequently, as well as other ranges in the Highlands and Islands, the study found.

SNH's Des Thompson said the study offered challenges to protect Scotland's environment.

He said: "It is refreshing to have a report based on objective science as well as interviews.

Mountains' popularity offers fresh challenges

"There are challenges ahead for natural and wild places and this study will help us to formulate a practical strategy for future management of our mountains."

Magnus Magnusson, KBE, founder-chairman of SNH, said: "Mountains harbour vivid life and growth in unexpected, rugged and hidden places.

"Mountains revive the ailing soul with the power and purity of their beauty, while hugging to themselves some of the deepest secrets of the evolution of our planet.

"This book captures so much of the essential spirit of Scotland's mountains, and highlights the importance of their nature - in every sense."

The conference aims to explain the geological events which formed the Highlands, the wildlife and the human impact on those areas of land.

It will be held on 7-8 November in the Pitlochry Festival Theatre.