"86" . "RIV/00216224:14310/05:00013891!RIV10-MSM-14310___" . . . . "[C68684A554AD]" . "14"^^ . . "agricultural management; archaeophytes; biological invasions; Central Europe; climate; crop characteristics; exotic species; invasion history; Neolithic agriculture; neophytes; soil type"@en . "P(GA526/00/1443), Z(AV0Z60050516), Z(MSM 143100010), Z(MSM0021620828), Z(MSM0021622416)" . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . . . . "Variables determining the number of native and alien plants on arable land in Central Europe are identified. Species richness of 698 samples of weed floras recorded in the Czech Republic in plots of a standard size of 100 m2 in 1955-2000 was studied in relation to altitudinally based floristic region, soil type, type of cultivated crop, climatic variables, altitude, year of the record, crop cover and height, and human population density in the region. Vascular plant species were classified into native and alien, the latter divided in archaeophytes, introduced before AD 1500, and neophytes, introduced after this date. The use of minimal adequate models in the analysis of covariance allowed determination of the net effects of mutually correlated environmental variables. Models for particular species groups explained 33-48% of variation in species numbers and 27-51% in proportions; however, explanatory variables affected native species, archaeophytes, and neophytes differently."@en . . . "Jaro\u0161\u00EDk, Vojt\u011Bch" . . "Alien plants in temperate weed communities: prehistoric and recent invaders occupy different habitats"@en . . . . . "Alien plants in temperate weed communities: prehistoric and recent invaders occupy different habitats" . "2"^^ . "Tich\u00FD, Lubom\u00EDr" . "0012-9658" . . "Chytr\u00FD, Milan" . "Ecology" . . "Wild, Jan" . "511725" . . . . "14310" . . . . "Variables determining the number of native and alien plants on arable land in Central Europe are identified. Species richness of 698 samples of weed floras recorded in the Czech Republic in plots of a standard size of 100 m2 in 1955-2000 was studied in relation to altitudinally based floristic region, soil type, type of cultivated crop, climatic variables, altitude, year of the record, crop cover and height, and human population density in the region. Vascular plant species were classified into native and alien, the latter divided in archaeophytes, introduced before AD 1500, and neophytes, introduced after this date. The use of minimal adequate models in the analysis of covariance allowed determination of the net effects of mutually correlated environmental variables. Models for particular species groups explained 33-48% of variation in species numbers and 27-51% in proportions; however, explanatory variables affected native species, archaeophytes, and neophytes differently." . "RIV/00216224:14310/05:00013891" . . . . . "6"^^ . . . . "Py\u0161ek, Petr" . "Alien plants in temperate weed communities: prehistoric and recent invaders occupy different habitats"@en . "3" . "Alien plants in temperate weed communities: prehistoric and recent invaders occupy different habitats" . "Krop\u00E1\u010D, Zden\u011Bk" .