Interspecific associations in the Czech herbaceous vegetation
This is an overview of interspecific associations for herbaceous plant species which are common constituents of grasslands and perennial herbaceous vegetation in the Czech Republic. The associations were calculated on the basis of 15,898 vegetation samples (releves) from the Czech National Phytosociological Database for 918 species with 25 and more records. This dataset included the vegetation of meadows, pastures, dry grasslands, heathlands, sandy grasslands, alpine grasslands, tall-forb vegetation, reed-bed and tall-sedge vegetation, inland salt marshes, and perennial ruderal vegetation. Interspecific associations were calculated as u-value which is a statistical measure derived from Gaussian distribution (Bruelheide 2000, J. Veg. Sci. 11: 167-178). The u-value is proportional to the tendency of a species to occur in releves where another species occurs.
The species list is organized as follows:
Species names, in alphabetical order, are followed by the number of occurrences in the dataset (in brackets). This figure roughly reflects occurrence frequency of the species in Czech herbaceous vegetation. Every species is followed by a list of 15 most associated species, ranked by decreasing u-value, i.e. by decreasing association with the given species.