 The local Biodiversity Action Plan recommends land management measures to control the spread of <unk> and <unk> and identifies four non @-@ native , invasive species as threatening native biodiversity : Japanese <unk> , <unk> , New Zealand <unk> and mink . It also identifies problems of over @-@ grazing resulting in the impoverishment of moorland and upland habitats and a loss of native woodland , caused by the large numbers of red deer and sheep . 
