 The local Biodiversity Action Plan recommends land management measures to control the spread of ragwort and bracken and identifies four non @-@ native , invasive species as threatening native biodiversity : Japanese knotweed , rhododendron , New Zealand flatworm 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 . 
 The local Biodiversity Action Plan <a href='uninflect' title='1'><mark>recommends</mark></a> land management measures to control the spread of ragwort and bracken and <a href='uninflect' title='2'><mark>identifies</mark></a> four non @-@ native , invasive species as threatening native biodiversity : Japanese knotweed , rhododendron , New Zealand flatworm and mink . It also <a href='uninflect' title='3'><mark>identifies</mark></a> 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 . 
The local Biodiversity Action Plan recommend land management measures to control the spread of ragwort and bracken and identify four non @-@ native , invasive species as threatening native biodiversity : Japanese knotweed , rhododendron , New Zealand flatworm and mink . It also identify problems of over @-@ grazing resulting in da impoverishment of moorland and upland habitats and a loss of native woodland , caused by tdalarge numbers of red deer and sheep .