THE EFFECTS OF CONIFER FOREST DESIGN AND MANAGEMENT ON ABUNDANCE AND DIVERSITY OF ROVE BEETLES (COLEOPTERA, STAPHYLINIDAE) - IMPLICATIONS FOR CONSERVATION

The effects of coniferous afforestation on rove beetles (Coleoptera, S taphylinidae) was investigated in Kielder Forest in 1988 by pitfall an d turf sampling in plantations of various age and in unplanted sites. Tree planting decreased habitat availability for most beetles, but pro vided new habitat for forest species. The greatest abundance, species richness and diversity occurred in non-afforested sites. Site ordinati on demonstrated an upland group on acid soils and a lowland group on m ineral soils, with wet and dry components; species ordination was simi lar. A central forest group was due to both forest species and origina l species being maintained. Similarly, classification separated closed -canopy forest sites with little ground vegetation from the remainder. Afforestation had increased habitat diversity by adding trees, rides and roads to the original habitats, but diversity per unit area had de creased Forest managers should aim to increase staphylinid diversity ' by design', particularly by varying tree species and age class so as t o develop greater biological and structural diversity. Habitat diversi ty could further beenhanced by conserving representative areas of form er land use, such as farm fields, river banks and open moorland; activ e management might be necessary to sustain these. Staphylinid species are favoured by forest edge habitats, so would gain from the integrati on of small habitat units within plantations, resulting in a beneficia l 'knock-on' effect by being food for birds and small mammals.