TREAD carefully is the call made to people going on moors in this area.
The Moorland Association made the appeal to help protect rare ground-nesting birds.
The association is urging cyclists, dog walkers and horse riders to stick to rights of way, paths and roads until the end of July, to avoid disturbing birds in the breeding season.
Dogs should also be kept under tight control on heather moorland, which provides a breeding refuge for rare birds such as the curlew, lapwing, merlin, golden plover, redshank, snipe and dunlin.
Because they nest on the ground, the birds are vulnerable to disturbance from people and animals.
If a mother is frightened off her nest, the eggs become cold and the chicks inside die.
Chicks which have hatched can scatter when disturbed and get separated from their parents.
If they are not taken by predators, they often die from lack of warmth or food.
Association chairman Simon Bostock said it was important to tell the public now to be careful, because next spring new laws will affect what people can do on moorland.
The Countryside Rights of Way Act 2000 saw mountains, moorland, heath and downland being mapped across the UK.
Areas of Open Access were designated, where people will be able to walk without sticking to rights of way or bridle- paths.
All these areas will be opened to the public by spring, 2005. Around 80% of the land is moorland.
Mr Bostock said the measures were necessary.
He said: "Golden plover, curlew and lapwing are five times more common on grouse moors than moors not managed for grouse.
"We must all do our best to protect them."