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References

  • Aerts, R. (1999) Interspecific competition in natural plant communities: mechanisms, trade-offs and plant–soil feedbacks. Journal of Experimental Botany, 50, 2937.
  • Aerts, R., Berendse, F., De Caluwe, H. & Schmitz, M. (1990) Competition in heathland along an experimental gradient of nutrient availability. Oikos, 57, 310318.
  • Allen, S.E. (1989) Chemical Analysis of Ecological Materials, 2nd edn. Blackwells, Oxford.
  • Alonso, I., Hartley, S.E. & Thurlow, M. (2001) Heather–grass competition on Scottish moorlands: interacting effects of nutrient enrichment and grazing regime. Journal of Vegetation Science, 12, 249260.
  • Anderson, P. & Yalden, D.W. (1981) Increased sheep numbers and loss of heather moorland in the Peak District, England. Biological Conservation, 20, 195213.
  • Berendse, F. (1985) The effect of grazing on the outcome of competition between plant species with different nutrient requirements. Oikos, 44, 3539.
  • Bernays, E.A. & Chapman, R.F. (1994) Host–Plant Selection by Phytophagous Insects. Chapman & Hall, New York.
  • Ter Braak, C.J.F. (1988) canoco –a FORTRAN Program for Canonical Community Ordination. GLW, Wageningen.
  • Ter Braak, C.J.F. (1996) Unimodal models to relate species to environment. DLO-Agricultural Mathematics Group, Wageningen.
  • Ter Braak, C.J.F. & Šmilauer, P. (1998) canoco Reference Manual and User's Guide to Canoco for Windows. Software for Canonical Community Ordination Version 4. Microcomputer Power, Ithaca, NY, USA.
  • Bredowski, J.J.M. & Zeilinga, R. (1987) Transition from heathland into grassland: damaging effects of heather beetle. Journal of Ecology, 75, 159175.
  • Brunsting, A.M.H. & Heil, G.W. (1985) The role of nutrients in the interactions between a herbivorous beetle and some competing plant species in heathlands. Oikos, 44, 2326.
  • Cherrill, A.J. & Rushton, S.P. (1993) The Auchenorrhyncha of an unimproved moorland in Northern England. Ecological Entomology, 18, 95103.
  • Crawley, M.J. (1993) GLIM for Ecologists. Blackwell Scientific Publications, Oxford.
  • Denno, R.F. & Roderick, G.K. (1991) Influence of patch-size, vegetation texture and host-plant architecture on the diversity, abundance and life-history styles of sap-feeding herbivores. Habitat Structure (eds S.S.Bell, E.D.McCoy & H.R.Mushinsky), pp. 169196. Chapman & Hall, London.
  • Duncan, A.J., Hartley, S.E. & Iason, G.R. (1994) Fine-scale discrimination of forage quality by sheep offered a soya-bean meal or barley supplement while grazing a nitrogen-fertilised heather (Calluna vulgaris) mosaic. Journal of Agricultural Science, 123, 363370.
  • Eyre, M.D., Woodward, J.C. & Luff, M.L. (2001) The distribution of grassland Auchenorrhyncha assemblages (Homoptera: Cercopidae, Cicidellidae, Delphacidae) in northern England and Scotland. Journal of Insect Conservation, 5, 3745.
  • Gardner, S.M., Cabido, M.R., Valladares, G.R. & Diaz, S. (1995) The influence of habitat structure on arthropod diversity in Argentine semi-arid Chaco forest. Journal of Vegetation Science, 6, 349356.
  • Gardner, S.M., Hartley, S.E., Davies, A. & Palmer, S. (1997) Carabid communities on heather moorlands in North East Scotland: the consequences of grazing pressure for community diversity. Biological Conservation, 81, 275286.
  • Genney, D.R., Alexander, I.J. & Hartley, S.E. (2000) Exclusion of grass roots from soil organic layers by Calluna: the role of ericoid mycorrhizas. Journal of Experimental Botany, 51, 11171125.
  • Genney, G.R., Alexander, I.J. & Hartley, S.E. (2002) Soil organic matter distribution and below-ground competition between Calluna vulgaris and Nardus stricta. Functional Ecology, 16, 664670.
  • Genney, D.R., Hartley, S.E. & Alexander, I.J. (2001) Arbuscular mycorrhizal colonisation increases with host-density in a heathland community. New Phytologist, 152, 355363.
  • Gimingham, C.H. (1985) Age–related interactions between Calluna vulgaris and phytophagous insects. Oikos, 44, 1216.
  • Hartley, S.E. (1997) The effects of grazing and nutrient inputs on grass–heather competition. Botanical Journal of Scotland, 49, 315324.
  • Hartley, S.E. & Amos, L. (1999) Competitive interactions between Nardus stricta and Calluna vulgaris: the effect of fertiliser and defoliation on above and below ground performance. Journal of Ecology, 87, 330340.
  • Hartley, S.E. & Gardner, S.M. (1995) The response of Philaenus spumarius (Homoptera: Cercopidae) to fertilizing and shading its moorland host-plant (Calluna vulgaris). Ecological Entomology, 20, 396399.
  • Heil, G.W. & Bruggink, M. (1987) Competition for nutrients between Calluna vulgaris (L.) Hull and Molinia caerulea (L.) Moench. Oecologia, 73, 105108.
  • Heil, G.W. & Diemont, W.H. (1983) Raised nutrient levels change heathland into grassland. Vegetatio, 53, 113120.
  • Hester, A.J. & Ballie, G.J. (1998) Spatial and temporal patterns of heather use by sheep and red deer within natural heather/grass mosaics. Journal of Applied Ecology, 35, 772784.
  • Kerslake, J.E., Kruuk, L.E.B., Hartley, S.E. & Woodin, S.J. (1996) Winter moth (Operophtera brumata, Lepidoptera. Geometridae) outbreaks on Scottish heather moorlands: effects of host plant and parasitoids on larval survival and development. Bulletin of Entomological Research, 86, 155164.
  • Kerslake, J.E., Woodin, S.J. & Hartley, S.E. (1998) Effects of carbon dioxide and nitrogen enrichment on a plant–insect interaction: the quality of Calluna vulgaris as a host for Operophtera brumata. New Phytologist, 140, 4353.
  • Kloet, G.S. & Hinks, W.D. (1964) Check List of British Insects Part 1: Small Orders and Hemiptera. 2nd edn. Royal Entomological Society, London.
  • Manly, B.F.J. (1986) Multivariate Statistical Methods. Chapman & Hall, London.
  • Palmer, S.C.F. & Hester, A.J. (2000) Predicting spatial variation in heather utilisation by sheep and red deer within heather/grass mosaics. Journal of Applied Ecology, 37, 616631.
  • Palmer, S.C.F., Hester, A.J., Elston, D.A., Gordon, I.J. & Hartley, S.E. (2003) The perils of having tasty neighbours: grazing impacts of large herbivores at vegetation boundaries. Ecology, in press.
  • Pitcairn, C.E.R., Fowler, D. & Grace, J. (1995) Deposition of fixed atmospheric nitrogen and foliar nitrogen content of bryophytes and Calluna vulgaris (L.) Hull. Environmental Pollution, 88, 193205.
  • Prestidge, R.A. & McNeill, S. (1983) Auchenorrhyncha–host plant interactions: leafhoppers and grasses. Ecological Entomology, 8, 331339.
  • Prins, A.H., Berdowski, J.M. & Latuhihin, M.J. (1991) Effect of NH4-fertilisation in the maintenance of a Calluna vulgaris vegetation. Acta Botanica Neerlandica, 40, 269279.
  • Rowland, A.P. (1983) An automated method for the determination of ammonium-N in ecological materials. Communications in Soil Science and Plant Analysis, 13, 4963.
  • Sanderson, R.A., Rushton, S.P., Cherrill, A.J. & Byrne, J.P. (1995) Soil, vegetation and space: an analysis of their effects on the invertebrate communities of a moorland in north-east England. Journal of Applied Ecology, 32, 506518.
  • SAS Institute Inc. (1996) SAS/STAT. Software: Changes and Enhancements Through Release 6·11. SAS Institute Inc, Cary, NC; 531–656.
  • De Smidt, J.T. (1995) The imminent destruction of northwest European heaths due to atmospheric nitrogen deposition. Heaths and Moorland. Cultural Landscapes (eds D.B.A.Thompson, A.Hester & M.B.Usher), pp. 206217. Scottish Natural Heritage, Edinburgh.
  • Stahling-Westerberg, A. (2001) The habitat use and diet of black grouse Tetrao tetrix in the Pennine hills of northern England. Bird Study, 48, 7689.
  • Thompson, D.B.A., MacDonald, A.J., Marsden, J.H. & Galbraith, C.A. (1995) Upland heather moorland in great Britain: a review of international importance, vegetation change and other objectives, for nature conservation. Biological Conservation, 71, 163178.
  • Tudor, G.J. & Mackay, E.C. (1995) Upland land cover changes in post-war Scotland. Heaths and Moorland. Cultural Landscapes (eds D.B.A.Thompson, A.J.Hester & M.B.Usher), pp. 2842. Scottish Natural Heritage, Edinburgh.
  • Usher, M.B. (1992) Management and diversity of arthropods in Calluna heathland. Biodiversity and Conservation, 1, 6379.
  • Usher, M.B. & Thompson, D.B.A. (1993) Variation in the upland heathlands of Great Britain: conservation importance. Biological Conservation, 66, 6981.
  • Walton, K.C. (1979) Diet of meadow pipits Anthus pratensis on mountain grassland in Snowdonia. Ibis, 121, 325334.
  • Welch, D. (1986) Studies in the grazing of heather moorland in north-east Scotland. V. Trends in Nardus stricta and other unpalatable graminoids. Journal of Applied Ecology, 23, 10471058.
  • Welch, D. & Scott, D. (1995) Studies in the grazing of heather moorland in north-east Scotland. VI 20-year trends in botanical composition. Journal of Applied Ecology, 32, 596611.