abundance

O'Connor, R.S., Kunin, W.E., Garratt, M.P.D., Potts, S.G., Roy, H.E., Andrews, C., Jones, C.M., Peyton, J.M., Savage, J., Harvey, M.C., Morris, R.K.A., Roberts, S.P.M., Wright, I., Vanbergen, A.J. & Carvell, C. (2019) Monitoring insect pollinators and flower visitation: The effectiveness and feasibility of different survey methods. Methods in Ecology and Evolution, 10, 2129-2140, .
González-Megías, A., Menéndez, R., Roy, D.B., Brereton, T.M. & Thomas, C.D. (2008) Changes in the composition of British butterfly assemblages over two decades. Global Change Biology, 14, 1464-1474.
Sparks, T.H., Roy, D.B. & Dennis, R.L.H. (2005) The influence of temperature on migration of Lepidoptera into Britain. Global Change Biology, 11, 507-514.