Vanbergen, A J, Baude, M, Biesmeijer, J C, Britton, N F, Brown, M J F, Bryden, J, Budge, G E, Bull, J C, Carvell, C, Challinor, A J, Connolly, C N, Evans, D J, Feil, E J, Garratt, M P, Greco, M K, Heard, M S, Jansen, V A A, Keeling, M J, Kunin, W E, Marris, G C, Memmott, J, Murray, J T, Nicolson, S W, Osborne, J L, Paxton, R J, Pirk, C W W, Polce, C, Potts, S G, Priest, N K, Raine, N E, Roberts, S, Ryabov, E V, Shafir, S, Shirley, M D F, Simpson, S J, Stevenson, P C, Stone, G N, Termansen, M & Wright, G A 2013, ' Threats to an ecosystem service : Pressures on pollinators ', Frontiers in Ecology and the Environment, vol. 11, no. 5, pp. 251-259 . https://doi.org/10.1890/120126 Vanbergen, A J, Baude, M, Biesmeijer, J C, Britton, N F, Brown, M JF, Brown, M, Bryden, J, Budge, G E, Bull, J C, Carvell, C, Challinor, A J, Connolly, C N, Evans, D J, Feil, E J, Garratt, M P, Greco, M K, Heard, M S, Jansen, V AA, Keeling, M J, Kunin, W E, Marris, G C, Memmott, J, Murray, J T, Nicolson, S W, Osborne, J L, Paxton, R J, Pirk, C WW, Polce, C, Potts, S G, Priest, N K, Raine, N E, Roberts, S, Ryabov, E V, Shafir, S, Shirley, M DF, Simpson, S J, Stevenson, P C, Stone, G N, Termansen, M & Wright, G A 2013, ' Threats to an ecosystem service: pressures on pollinators ', Frontiers in Ecology and the Environment, vol. 11, pp. 251-259 . https://doi.org/10.1890/120126