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'Habitats Directive' 
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Partager le résultat de cette rechercheIs the endangered Apium repens (Jacq.) Lag. rare because of a narrow regeneration niche ? / Sandra Burmeier in Plant Species Biology, vol. 23, n°2 (Juillet 2008)
Titre : Is the endangered Apium repens (Jacq.) Lag. rare because of a narrow regeneration niche ? Type de document : texte imprimé Auteurs : Sandra Burmeier, Auteur ; Kai Jensen, Auteur Année de publication : 2008 Article en page(s) : pp. 111-118 Langues : Anglais (eng) Mots-clés : germination ecology Habitats Directive plante rare seed buoyancy soil seedbank Résumé : "The conservation of rare plant species is an important aspect of global biodiversity protection, but in many cases these species and the reasons why they are rare are poorly understood. The perennial umbellifer Apium repens is generally regarded to be a rare species all over its European range. We hypothesized that its rarity might be caused by a restricted regeneration niche, that is, highly specific requirements for sexual regeneration, low seed dispersal potential and low endurance capacity of seeds in the ground. We conducted several experimental investigations on its germination ecology, hydrochorous dispersal potential and soil seed bank properties. Apium repens showed high germination success under a variety of abiotic conditions. Either light or cold-wet stratification was necessary to stimulate germination. Seeds were able to float for more than 50 days when protected from precipitation, and soil seed bank sampling revealed that at least some seeds of A. repens were contained in soil depths of up to 10 cm. Overall, our findings do not support the hypothesis that the rarity of A. repens is caused by highly specific requirements for its sexual regeneration. Nonetheless, its germination ecology should be considered when designing conservation measures for this endangered species." Type de publication : périodique Référence biblio : Burmeier S., Jensen K., 2008 - Is the endangered Apium repens (Jacq.) Lag. rare because of a narrow regeneration niche ? Plant Species Biology, 23 (2) : 111-118. DOI : 10.1111/j.1442-1984.2008.00212.x En ligne : https://esj-journals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1442-1984.2008.00 [...] Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67577
in Plant Species Biology > vol. 23, n°2 (Juillet 2008) . - pp. 111-118[article]Exemplaires(0)
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Titre : Vegetation-plot data and databases in Europe : an overview Type de document : texte imprimé Auteurs : Joop H. J. Schaminée, Auteur ; Stephan M. Hennekens, Auteur ; Milan Chytrý, Auteur ; John Rodwell, Auteur Année de publication : 2009 Article en page(s) : pp. 173-185 Langues : Anglais (eng) Mots-clés : biodiversité eco-informatics Habitats Directive macroécologie nature conservation phytosociologie relevé TURBOVEG Résumé : "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" Type de publication : périodique Référence biblio : Schaminée J.-J., Hennekens S., Chytrý M., Rodwell J., 2009 - Vegetation-plot data and databases in Europe : an overview. Preslia, 81 (3) : 173-185. En ligne : http://www.preslia.cz/P093Schaminee.pdf Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66161
in Preslia > vol. 81, n°3 (Année 2009) . - pp. 173-185[article]Exemplaires(0)
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