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Roy, H.E., Pocock, M.J.O., Preston, C.D., Roy, D.B., Savage, J. & Tweddle, J.C. (2012) Understanding Citizen Science And Environmental Monitoring: Final Report On Behalf Of Uk Environmental Observation Framework. NERC/Centre for Ecology & Hydrology, Wallingford.

Roy, H.E. & Pocock, M.J.O. (2013) The value of citizen science. People and Science.

Roy, H.E., Peyton, J., Aldridge, D.C., Bantock, T., Blackburn, T.M., Britton, R., Clark, P., Cook, E., Dehnen-Schmutz, K., Dines, T., Dobson, M., Edwards, F., Harrower, C.A., Harvey, M.C., Minchin, D., Noble, D.G., Parrott, D., Pocock, M.J.O., Preston, C.D., Roy, S., Salisbury, A., Schönrogge, K., Sewell, J., Shaw, R.H., Stebbing, P., Stewart, A.J.A. & Walker, K.J. (2014) Horizon scanning for invasive alien species with the potential to threaten biodiversity in Great Britain. Global Change Biology, 20, 3859-3871.

Roy, H.E., Brown, P.M.J., Frost, R. & Poland, R. (2011) Ladybirds (Coccinellidae) Of Britain And Ireland. Field Studies Council, Shrewsbury.

Roy, H.E. (2010) Coccinellids In A Changing World. In: Ecology Of Aphidophaga (Eds.: P. Kindlmann). Springer Academic Publishers, Netherlands.

Roy, H.E. & Roy, D.B. (2008) Harmonia Axyridis. In: Handbook Of Alien Species In Europe. (Ed.: Daisie). Springer series in Invasion Ecology.

Roy, H.E. & Migeon, A. (2010) Non-native coccinellids in Europe. In: DAISIE: Non-natives invertebrates in Europe (ed. A. Roques). BioRisk, 4, 293–313.

Roy, H.E., Hails, R.S., Hesketh, H., Roy, D.B. & Pell, J.K. (2009) Beyond biological control: non-pest insects and their pathogens in a changing world. Insect Conservation and Diversity, 2, 65-72.

Roy, H.E. (2010) Encounters with aliens Invasive species - they're here!. Catalyst, 20, 20-22.

Roy, H.E. & Wajnberg, E. (2008) From biological control to invasion: the ladybird Harmonia axyridis as a model species. From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species. (eds H.E. Roy), & Wajnberg, E.), pp. 1-4. Springer Netherlands, Dordrecht.

Roy, H.E., Brown, P.M.J., Rothery, P., Ware, R.L. & Majerus, M.E.N. (2007) Interactions between the fungal pathogen Beauveria bassiana and three species of coccinellid: Harmonia axyridis, Coccinella septempunctata and Adalia bipunctata. BioControl, 53, 265-276.

Roy, H.E., Hesketh, H., McCracken, M.E., Pywell, R.F. & Hails, R.S. (2009) Living on the edge: interactions between Lepidoptera and parasites in fragmented habitats. Atropos, 37, 19-26.

Roy, H.E., Brown, P.M.J., Ware, R.L., Michie, L.J., Beckmann, B. & Majerus, M.E.N. (2008) The harlequin ladybird marches on. British Wildlife, 19, 182-186.

Roy, H.E., Beckmann, B., Comfont, R.F., Hails, R.S., Harrington, R., Medlock, J., Purse, B. & Shortall, C.R. (2009) Nuisance Insects And Climate Change. Centre for Ecology and Hydrology, Wallingford.

Roy, H.E., Rorke, S.L., Beckmann, B., Booy, O., Botham, M.S., Brown, P.M.J., Harrower, C.A., Noble, D.G., Sewell, J. & Walker, K.J. (2015) The contribution of volunteer recorders to our understanding of biological invasions. Biological Journal of the Linnean Society, 115, 678–689.

Roy et al. 2015 - The contribution of volunteer recorders to our understanding of biological invasions.pdf (2.25 MB)

Roy, H.E., Bacon, J., Beckmann, B., Harrower, C.A., Hill, M.O., Isaac, N.J.B., Preston, C.D., Rathod, B., Rorke, S.L., Marchant, J.H., Musgrove, A.J., Noble, D.G., Sewell, J., Seeley, B., Sweet, N., Adams, L., Bishop, J., Jukes, A.R., Walker, K.J. & Pearman, D.A. (2012) Non-Native Species In Great Britain: Establishment, Detection And Reporting To Inform Effective Decision-Making. Defra.

Roy et al. 2012 - Defra project report - Non-native species in Great Britain.pdf (3.34 MB)

Roy, H.E., Preston, C.D., Harrower, C.A., Rorke, S.L., Noble, D.G., Sewell, J., Walker, K.J., Marchant, J.H., Seeley, B., Bishop, J., Jukes, A.R., Musgrove, A.J., Pearman, D.A. & Booy, O. (2014) GB Non-native Species Information Portal: documenting the arrival of non-native species in Britain. Biological Invasions, 16, 2495-2505.

Roy, H.E., Scalera, R., Dunn, A. & Hesketh, H. (2016) Invasive species: Control wildlife pathogens too. Nature, 530, 281-281.

Roy, H.E., Baxter, E., Saunders, A. & Pocock, M.J.O. (2016) Focal Plant Observations as a Standardised Method for Pollinator Monitoring: Opportunities and Limitations for Mass Participation Citizen Science. Plos One, 11.

Roy, H.E., Brown, P.M.J., Adriaens, T., Berkvens, N., Borges, I., Clusella-Trullas, S., Comont, R.F., De Clercq, P., Eschen, R., Estoup, A., Evans, E.W., Facon, B., Gardiner, M.M., Gil, A., Grez, A.A., Guillemaud, T., Haelewaters, D., Herz, A., Honek, A., Howe, A.G., Hui, C., Hutchison, W.D., Kenis, M., Koch, R.L., Kulfan, J., Handley, L.L., Lombaert, E., Loomans, A., Losey, J., Lukashuk, A.O., Maes, D., Magro, A., Murray, K.M., San Martin, G., Martinkova, Z., Minnaar, I.A., Nedved, O., Orlova-Bienkowskaja, M.J., Osawa, N., Rabitsch, W., Ravn, H.P., Rondoni, G., Rorke, S.L., Ryndevich, S.K., Saethre, M.G., Sloggett, J.J., Soares, A.O., Stals, R., Tinsley, M.C., Vandereycken, A., van Wielink, P., Viglasova, S., Zach, P., Zakharov, I.A., Zaviezo, T. & Zhao, Z.H. (2016) The harlequin ladybird, Harmonia axyridis: global perspectives on invasion history and ecology. Biological Invasions, 18, 997-1044.

Roy, H.E., Hesketh, H., Purse, B.V., Eilenberg, J., Santini, A., Scalera, R., Stentiford, G.D., Adriaens, T., Bacela-Spychalska, K., Bass, D., Beckmann, K.M., Bessell, P., Bojko, J., Booy, O., Cardoso, A.Cristina, Essl, F., Groom, Q., Harrower, C.A., Kleespies, R., Martinou, A.F., van Oers, M.M., Peeler, E.J., Pergl, J., Rabitsch, W., Roques, A., Schaffner, F., Schindler, S., Schmidt, B.R., Schönrogge, K., Smith, J., Solarz, W., Stewart, A.J.A., Stroo, A., Tricarico, E., Turvey, K.M.A., Vannini, A., Vilà, M., Woodward, S., Wynns, A.Amtoft & Dunn, A.M. (2016) Alien Pathogens on the Horizon: Opportunities for Predicting their Threat to Wildlife. Conservation Letters, n/a-n/a.