Selection against ruderals in Danish grasslands over an eight-year period

In order to investigate what community selection forces are operating on Grime's CSR strategies in different semi-natural grassland habitats that were not subjected to successional processes, a time-series analysis of 2946 Danish grassland plots from an eight-year period with pin-point plant cover data was conducted. Grime's CSR strategies were used for grouping plant species into functional types, which were then treated as dependent variables in a time-series analysis. Across four grassland habitat types, there was significant selection against ruderal plant species during the eight-year period. Furthermore, the monitoring data indicated that the decreasing cover of ruderals may, in part be, due to reduced grazing pressure of large herbivores. As a consequence of the findings in this study and others, it may be suggested that increased disturbance, e.g. by large herbivores, is a suitable management strategies for grassland habitats.