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Ajouter le résultat dans votre panierMaps of the level of invasion of the Czech Republic by alien plants / Milan Chytrý in Preslia, 81 (2009)
Titre : Maps of the level of invasion of the Czech Republic by alien plants Type de document : Électronique Auteurs : Milan Chytrý (1967-) ; Jan Wild ; Petr Pyšek ; Lubomír Tichý ; Jiří Danihelka (1968-) ; Ilona Knollova Année de publication : 2009 Article en page(s) : 187-207 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes
[CBNPMP-Géographique] République TchèqueMots-clés : Picea abies (L.) Karsten Pinus sylvestris L. Résumé : A series of maps showing the level of invasion of the Czech Republic by alien plants was developed based on a quantitative assessment of the level of invasion of 35 terrestrial habitat types at different altitudes. The levels of invasion were quantified for 18,798 vegetation plots, using two measures: proportion of the species that are aliens and total cover of alien species. Separate assessments were made for archaeophytes and neophytes. Within each habitat, the level of invasion was related to altitude using generalized linear models. The level of invasion, depending on the measure used, decreased with altitude in 16 out of 20 habitats for archaeophytes and 18 out of 23 for neophytes. In two habitats, one measure of the level of invasion increased with altitude for archaeophytes. The values of the level of invasion predicted by generalized linear models for particular combinations of habitats and altitudes were projected onto a land-cover map and digital elevation map of the country. Four maps showing the level of invasion were produced, based on the proportion of the species that are archaeophytes or neophytes, and cover of archaeophytes and neophytes. The maps show that both archaeophytes and neophytes are most common in lowland agricultural and urban areas, whereas they are sparsely represented in mountainous areas. At middle altitudes, agricultural areas are more invaded than forested areas. Outside agricultural and urban areas, high levels of invasion are found especially in lowland sandy areas and river corridors. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142446
in Preslia > 81 (2009) . - 187-207Chytrý, Milan (1967-), Wild, Jan, Pyšek, Petr, Tichý, Lubomír, Danihelka, Jiří (1968-), Knollova, Ilona 2009 Maps of the level of invasion of the Czech Republic by alien plants. Preslia, 81: 187-207.Documents numériques
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Article (2009)URL
Titre : Differences in germination and seedling establishment of alien and native Impatiens species Type de document : Électronique Auteurs : Irena Perglova ; Jan Pergl (1977-) ; Hana Skalova ; Lenka Moravcová ; Vojtěch Jarošík (1958-2013) ; Petr Pyšek Année de publication : 2009 Article en page(s) : 357-375 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Ecologie de la germination
[CBNPMP-Thématique] Physiologie de la germination
[CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes
[CBNPMP-Thématique] Banque de semencesMots-clés : Impatiens Résumé : Comparative studies of closely related species may provide useful insights into the effect of species traits on invasion success since some of the biases associated with multispecies studies, such as phylogenetic effects, are considerably reduced by virtue of the experimental design. In this study seed and seedling traits of three congeneric alien species in Europe, differing in their region of origin, invasion status and history (Impatiens glandulifera, I. parviflora, I. capensis), were compared with the native I. noli-tangere in laboratory and common garden experiments. Seeds of I. glandulifera required the shortest period of stratification, germinated well both under laboratory and experimental garden conditions and the seedlings produced more biomass than those of the other species. Seeds of I. parviflora required a longer period of stratification, had the highest percentage germination but seedling emergence in the experimental garden was poorer than in I. glandulifera. Neither of these two species invasive in the Czech Republic formed soil seed banks. The native I. noli-tangere had the lowest percentage germination and formed a short-term persistent seed bank. Impatiens capensis germinated well in the laboratory, had the highest seedling emergence in the garden and its seed remained viable in the soil for three years. This indicates that in terms of germination and emergence, this species is comparable with the two invasive alien congeners and there appear to be no constraints to its invasion in the Czech Republic where it does not occur yet. Its absence may be due to a low propagule pressure; in the national flora I. capensis is listed as a potential future invader without mentioning it being cultivated in this country. Our results indicate that differences in the invasiveness of three alien species of balsams in the temperate zone of Central Europe can be attributed, at least in part, to their differing performances in the early stages of their life cycle. The short period of time required for seed stratification and the high seedling biomass of I. glandulifera might have increased its invasion potential compared to other Impatiens species occurring in the Czech Republic. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142551
in Preslia > 81 (2009) . - 357-375Perglova, Irena, Pergl, Jan (1977-), Skalova, Hana, Moravcová, Lenka, Jarošík, Vojtěch (1958-2013), Pyšek, Petr 2009 Differences in germination and seedling establishment of alien and native Impatiens species. Preslia, 81: 357-375.Documents numériques
Article (2009)URL
Titre : Vegetation-plot data and databases in Europe: an overview Type de document : Imprimé Auteurs : Joop H.J. Schaminée ; Stephan Hennekens ; Milan Chytrý (1967-) ; John S. Rodwell Année de publication : 2009 Article en page(s) : 173-185 Langues : Anglais (eng) Catégories : [LOTERRE-Biodiversité] Phytosociologie
[CBNPMP-Thématique] Groupements végétaux, phytosociologieRésumé : During the last decade many electronic databases of vegetation plots, mainly phytosociological relevés, were established in different European countries. These databases contain information which is extremely valuable for both testing various macroecological hypotheses and for nature conservation surveying or monitoring. The aim of this paper is to provide estimates of the number of vegetation plots there are in Europe, how many are stored in an electronic format and to assess their distribution across European countries and regions.We sent a questionnaire to the managers of national or regional databases of vegetation plots and other prominent vegetation ecologists. Meta-data obtained in this way indicate that there are > 4,300,000 vegetation-plot records in Europe, of which > 1,800,000 are already stored electronically. Of the electronic plots, 60% are stored in TURBOVEG databases. Most plot records probably exist in Germany, the Netherlands, France, Poland, Spain, Czech Republic, Italy, UK, Switzerland and Austria. The largest numbers of plots per unit area are in the Netherlands, Belgium, Denmark and countries of central Europe. The most computerized plots per country exist in the Netherlands (600,000), followed by France, the Czech Republic and the UK. Due to its strong phytosociological tradition, Europe has many more vegetation plots than any other part of the world. This wealth of unique ecological information is a challenge for future biodiversity studies. With the alarming loss in biodiversity and environmental problems like global warming and ongoing changes in land use, there is an urgent need for wide-scale scientific and applied vegetation research. Developments of information systems such as SynBioSys Europe and facilitation of data flow between the national and regional databases should make it easier to use these vegetation-plot data. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150345
in Preslia > 81 (2009) . - 173-185Schaminée, Joop H.J., Hennekens, Stephan, Chytrý, Milan (1967-), Rodwell, John S. 2009 Vegetation-plot data and databases in Europe: an overview. Preslia, 81: 173-185.Documents numériques
Article (2009)URL
