You seem to be attempting to access an item that has been removed from the repository.
There is a later version of the item you are trying to access:
Wood, K.A., Stillman, R. A., Clarke, R. T., Daunt, F. and O'Hare, M.T., 2012. The impact of waterfowl herbivory on plant standing crop:a meta-analysis. Hydrobiologia, 686, 157 - 167 .