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Auteur Stephan M. Hennekens |
Documents disponibles écrits par cet auteur
Affiner la rechercheAssignment of relevés to pre-defined classes by supervised clustering of plant communities using a new composite index / Onno van Tongeren in Journal of Vegetation Science, vol. 19, n°4 (Année 2008)
Titre : Assignment of relevés to pre-defined classes by supervised clustering of plant communities using a new composite index Type de document : Livre Auteurs : Onno van Tongeren, Auteur ; N. Gremmen, Auteur ; Stephan M. Hennekens, Auteur Année de publication : 2008 Article en page(s) : pp. 525-536 Langues : Anglais Résumé : " Our method performs well in assigning community composition records to previously established classes. Its performance is comparable to the performance of other methods of supervised clustering. Compared with a multi?layer perceptron (a type of artificial neural network), fewer parameters have to be estimated. Our method does not need the original relevé data for the types, but uses synoptic tables. Another practical advantage is the provision of directly interpretable information on the contributions of separate species to the result." Type de publication : périodique Référence biblio : van Tongeren O., Gremmen N., Hennekens S., 2008 - Assignment of relevés to pre-defined classes by supervised clustering of plant communities using a new composite index. Journal of Vegetation Science, 19 (4) : 525-536. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66167
in Journal of Vegetation Science > vol. 19, n°4 (Année 2008) . - pp. 525-536[article]Exemplaires
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Titre : Describing vegetation at the landscape level : “PAYSAGE”, a database designed for series and geoseries datasets Type de document : périodique Auteurs : Camile Roux, Auteur ; Gilles Thébaud, Auteur ; Jan-Bernard Bouzillé, Auteur ; Anne Bonis, Auteur ; Stephan M. Hennekens, Auteur Année de publication : 2019 Article en page(s) : pp. 13-24 Langues : Anglais Catégories : [ZG] CLERMONT-FERRAND (63113) Mots-clés : symphytosociologie paysage base de données VegFrance TURBOVEG Résumé : "The CarHAB project, funded by the French Ministry of Environment, was set up tomap the vegetation all over the French territory. In this objective, both analytical (plot) relevés and synrelevés were carried out. Based on the case study of low mountain habitats in the “chaine des Puys” (Massif central, France), this paper presents i)the methodology developed to carry out vegetation relevés at the landscape scale and ii) the database designed to store and fit synrelevés, as part of the national VegFrance database.This paper presents the structure of the “Paysage” database, the metadata collected together with plants communities in the synrelevés (and geosynrelevés), the method to record the synrelevés and how they are managed for the mapping of series and geoseries. The interpretation of the dataset regarding anthropic pressure on this landscape will be suggested." (source : auteurs) Type de publication : périodique Référence biblio : Roux C., Thébaud G., Bouzillé J.-B., Bonis A., Hennekens S., 2019 - Describing vegetation at the landscape level : “PAYSAGE”, a database designed for series and geoseries datasets. Contributii botanice, 54 : 13-24. ID PMB : 68857 DOI : 10.24193/Contrib.Bot.54.1 En ligne : http://contributiibotanice.reviste.ubbcluj.ro/materiale/2019/Contrib_Bot_vol_54_ [...] Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68857
in Contributii botanice > vol. 54 (Année 2019) . - pp. 13-24[article]Exemplaires
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Titre : Development of distribution maps of grassland habitats of EUNIS habitat classification Type de document : Livre Auteurs : Joop H. J. Schaminée, Auteur ; Milan Chytrý, Auteur ; Jürgen Dengler, Auteur ; Stephan M. Hennekens, Auteur ; John A. M. Janssen, Auteur ; Borja Jiménez-Alfaro, Auteur ; Ilona Knollová, Auteur ; Flavia Landucci, Auteur ; Corrado Marcenò, Auteur ; John Rodwell, Auteur Editeur : Wageningen [Pays-Bas] : Alterra Année de publication : 2016 Importance : 144 p. + annexes Note générale : Report EEA/NSS/16/005 Langues : Anglais Catégories : [habitats/milieux] 3 - Landes, fruticées et prairies
[ZG] EuropeMots-clés : carte de répartition habitat EUNIS Résumé : "This projects aims at parameterising the grassland units of the revised EUNIS habitat classification across Europe. Using the comprehensive plot dataset from the European Vegetation Archive (EVA), all grassland habitats (habitat group E) of Europe (including the coastal grey dunes, habitat subgroup B1.4) are formally defined with a unanimous floristic definition (with a new expert system approach, implemented in JUICE). For the 53 distinguished habitat types of grasslands sensu lato, for the first time lists of diagnostic, constant and dominant species are provided, based on statistical evaluation of the whole European dataset. Further, each of this habitats is presented with a distribution map based on the plots contained in EVA (ca. 250,000 georeferenced plots). Further cross-walks to the old EUNIS classification and the system used in the new European Red List of habitats are provided. All in all, the report represents the first consistent and data-based characterisation of grassland vegetation types on a level that roughly corresponds to phytosociological alliances (e.g. "E1.2a - Semi-dry perennial calcareous grassland" = Brometalia erecti; "E1.2b = Continental dry steppe" = Festucetalia valesiacae)." (source : auteurs) Type de publication : rapport d'études Référence biblio : Schaminée J.-J., Chytrý M., Dengler J., Hennekens S., Janssen J.-M., Jiménez-Alfaro B., Knollová I., Landucci F., Marcenò C., Rodwell J., 2016 - Development of distribution maps of grassland habitats of EUNIS habitat classification. Wageningen : Alterra, 144 p. + annexes. ID PMB : 64399 En ligne : https://www.researchgate.net/publication/311576694_Development_of_distribution_m [...] Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=64399 Exemplaires
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Titre : TURBOVEG, a comprehensive data base management system for vegetation data Type de document : Livre Auteurs : Stephan M. Hennekens, Auteur ; Joop H. J. Schaminée, Auteur Année de publication : 2001 Article en page(s) : pp. 589-591 Langues : Anglais Résumé : "The computer software package TURBOVEG (for Microsoft® Windows®) was developed in The Netherlands for the processing of phytosociological data. This package comprises an easy?to?use data base management system. The data bank to be managed can be divided into several data bases which may consist of up to 100 000 relevés each. The program provides methods for input, import, selection, and export of relevés. In 1994, TURBOVEG was accepted as the standard computer package for the European Vegetation Survey. Currently it has been installed in more than 25 countries throughout Europe and overseas." Type de publication : périodique Référence biblio : Hennekens S., Schaminée J.-J., 2001 - TURBOVEG, a comprehensive data base management system for vegetation data. Journal of Vegetation Science, 12 (4) : 589-591. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66158
in Journal of Vegetation Science > vol. 12, n°4 (Année 2001) . - pp. 589-591[article]Exemplaires
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Titre : Vegetation-plot data and databases in Europe : an overview Type de document : Livre 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 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
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