The North York Moors
Sandstones erode slowly and form poor acid soils which are deficient in nutrients. They are less permeable to water, impeding drainage and encouraging the formation of bogs. Sphagnum moss bogs are common where there is abundant rain and poor drainage. Cotton grass is a distinctive plant which grows in the boggy areas. In the cold acid waters of peat bogs there is little decomposition of organic material with the result that the dead sphagnum moss gradually accumulates to form peat. This raises the levels of the bogs and they dry out. Heather then invades the area. Large areas of the moors are now covered in heather, bilberries and grasses growing on thick layers of peat.
The acid soils and peat bogs are unsuitable for earthworms so species which usually feed on earthworms such as moles and the common shrew are absent on the moors. The pygmy shrew survives by eating the insects and spiders that live in the heather. Lapwing, curlew and redshank breed on the moors and there are sandpipers along the streams. Wheatear and golden plovers inhabit grassier patches on the moors and ring ouzels live in stony areas. Red grouse, which feed on young heather shoots, are abundant. The heather is burned in strips by gamekeepers and farmers to encourage new heather growth to feed the grouse. Grouse shooting is part of the moorland economy. About 20 per cent of the national park is covered in bracken. Few things can grow under its dense cover and it does not support many insects and is unpalatable to most animals. The bracken is extremely invasive.
Sheep are a ubiquitous part of the moorland landscape. Their grazing helps to maintain the open wild landscape that is needed for many other plants and animals to thrive.
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