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Altitude of individual records of alien plants in the Czech Republic regressed on the year of the record. An alternative model with the identity of individual species included was also highly significant (F = 52.0; df = 129, 28,158; P < 0.001) and showed that the pattern of colonization of higher altitudes was species-specific (deletion test on the differences in regression slope of the individual species on the year of the record: F = 7.49; df = 64, 28,223; P < 0.001).
