| Summary: | Biotic homogenization is the increasing similarity
of the species composition of communities over time and
represents a loss of biodiversity. We analysed changes in
weed vegetation over a period of 70 years by comparing
three datasets (from 1939, 2002 and 2012) sampled with
the same methodology. We present the results of changes
in species richness, homogenization and differentiation as
expanding neophytes and generalist species. The species
richness of weed communities decreased and the number
of neophytes in cereal fields and root crops increased
over time. The decreased ratio of specialists to generalists
in vernal communities and cereal crops indicates
homogenization, while the ratio of generalists to specialists
increased in root crops.
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