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Auteur Lubomír Tichý |
Documents disponibles écrits par cet auteur (12)
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Classification of European and Mediterranean coastal dune vegetation / Corrado Marcenò in Applied Vegetation Science, vol. 21, n°3 (Année 2018)
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Titre : Classification of European and Mediterranean coastal dune vegetation Type de document : texte imprimé Auteurs : Corrado Marcenò ; Riccardo Guarino ; Javier Loidi ; Mercedes Herrera ; Maike Isermann ; Ilona Knollová ; Lubomír Tichý ; Rossen Tzonev ; Alicia Teresa ; Rosario Acosta ; Úna FitzPatrick ; Dmytro Iakushenko ; John A. M. Janssen ; Borja Jiménez-Alfaro ; Zygmunt Kacki ; Iva Keizer-Sedlakova ; Vitaliy Kolomiychuk ; John Rodwell ; Joop H. J. Schaminée ; Urban Šilc ; Milan Chytrý Année de publication : 2018 Article en page(s) : pp. 533-559 Langues : Anglais (eng) Catégories : [habitats/milieux] 16.2 - Dunes
[ZG] Europe balkanique
[ZG] Europe occidentale atlantique et méditerranéenne
[Thèmes] Bassin méditerranéen
[Thèmes] Côte atlantiqueMots-clés : Ammophiletea biogéographie Honckenyo - Elymetea Koelerio - Corynephoretea canescentis phytosociologie classification de la végétation Résumé : "Although many phytosociological studies have provided detailed local and regional descriptions of coastal dune vegetation, a unified classification of this vegetation in Europe and the Mediterranean Basin has been missing. Our aim is to produce a formalized classification of this vegetation and to identify the main factors driving its plant species composition at a continental scale." (source : auteurs) Type de publication : périodique Référence biblio : Marcenò C., Guarino R., Loidi J., Herrera M., Isermann M., Knollová I., Tichý L., Tzonev R., Teresa A., Acosta R., FitzPatrick Ú., Iakushenko D., Janssen J.-M., Jiménez-Alfaro B., Kacki Z., Keizer-Sedlakova I., Kolomiychuk V., Rodwell J., Schaminée J.-J., Šilc U., Chytrý M., 2018 - Classification of European and Mediterranean coastal dune vegetation. Applied Vegetation Science, 21 (3) : 533-559. DOI : 10.1111/avsc.1237 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68326
in Applied Vegetation Science > vol. 21, n°3 (Année 2018) . - pp. 533-559[article]Exemplaires(0)
Disponibilité aucun exemplaire Determination of diagnostic species with statistical fidelity measures / Milan Chytrý in Journal of Vegetation Science, vol. 13, n°1 (Année 2002)
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Titre : Determination of diagnostic species with statistical fidelity measures Type de document : texte imprimé Auteurs : Milan Chytrý, Auteur ; Lubomír Tichý, Auteur ; Jason Holt, Auteur ; Zoltan Botta-Dukat, Auteur Année de publication : 2002 Article en page(s) : pp. 79-90 Langues : Anglais (eng) Résumé : "Statistical measures of fidelity, i.e. the concentration of species occurrences in vegetation units, are reviewed and compared. The focus is on measures suitable for categorical data which are based on observed species frequencies within a vegetation unit compared with the frequencies expected under random distribution. Particular attention is paid to Bruelheide's u value. It is shown that its original form, based on binomial distribution, is an asymmetric measure of fidelity of a species to a vegetation unit which tends to assign comparatively high fidelity values to rare species. Here, a hypergeometric form of u is introduced which is a symmetric measure of the joint fidelity of species to a vegetation unit and vice versa. It is also shown that another form of the binomial u value may be defined which measures the asymmetric fidelity of a vegetation unit to a species. These u values are compared with phi coefficient, chi‐square, G statistic and Fisher's exact test. Contrary to the other measures, phi coefficient is independent of the number of relevés in the data set, and like the hypergeometric form of u and the chi‐square it is little affected by the relative size of the vegetation unit. It is therefore particularly useful when comparing species fidelity values among differently sized data sets and vegetation units. However, unlike the other measures it does not measure any statistical significance and may produce unreliable results for small vegetation units and small data sets. The above measures, all based on the comparison of observed/expected frequencies, are compared with the categorical form of the Dufrêne‐Legendre Indicator Value Index, an index strongly underweighting the fidelity of rare species.
These fidelity measures are applied to a data set of 15 989 relevés of Czech herbaceous vegetation. In a small subset of this data set which simulates a phytosociological table, we demonstrate that traditional table analysis fails to determine diagnostic species of general validity in different habitats and large areas. On the other hand, we show that fidelity calculations used in conjunction with large data sets can replace expert knowledge in the determination of generally valid diagnostic species. Averaging positive fidelity values for all species within a vegetation unit is a useful approach to measure quality of delimination of the vegetation unit. We propose a new way of ordering species in synoptic species‐by‐relevé tables, using fidelity calculations."Type de publication : périodique Référence biblio : Chytrý M., Tichý L., Holt J., Botta-Dukat Z., 2002 - Determination of diagnostic species with statistical fidelity measures. Journal of Vegetation Science, 13 (1) : 79-90. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66163
in Journal of Vegetation Science > vol. 13, n°1 (Année 2002) . - pp. 79-90[article]Exemplaires(0)
Disponibilité aucun exemplaire Effects of different fidelity measures and contexts on the determination of diagnostic species / Wolfgang Willner in Journal of Vegetation Science, vol. 20, n°1 (Année 2009)
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Titre : Effects of different fidelity measures and contexts on the determination of diagnostic species Type de document : texte imprimé Auteurs : Wolfgang Willner, Auteur ; Lubomír Tichý, Auteur ; Milan Chytrý, Auteur Année de publication : 2009 Article en page(s) : pp. 130-137 Langues : Anglais (eng) Catégories : [habitats/milieux] 4 - Forêts
[ZG] Europe centraleMots-clés : abondance (écologie) Couvert végétal végétation arbustive phytossociologie classification de la végétation Résumé : "The strongest impact on the lists of diagnostic species was not the fidelity measure itself but the context of its application and the use of presence/absence or cover data. Despite the weak correlation between individual fidelity values, traditional (non-statistical) and statistical measures produce quite similar lists of diagnostic species, provided that the context of the analysis is the same. Both approaches have their advantages and disadvantages, and the choice of the appropriate algorithm should depend on the focus of the study." (source : auteurs) Type de publication : périodique Référence biblio : Willner W., Tichý L., Chytrý M., 2009 - Effects of different fidelity measures and contexts on the determination of diagnostic species. Journal of Vegetation Science, 20 (1) : 130-137. ID PMB : 65727 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65727
in Journal of Vegetation Science > vol. 20, n°1 (Année 2009) . - pp. 130-137[article]Exemplaires(0)
Disponibilité aucun exemplaire Ellenberg-type indicator values for European vascular plant species / Lubomír Tichý in Journal of Vegetation Science, vol. 34, n°1 (Année 2023)
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Titre : Ellenberg-type indicator values for European vascular plant species Auteurs : Lubomír Tichý, Auteur ; et al., Auteur Année de publication : 2023 Article en page(s) : e13168 Langues : Anglais (eng) Catégories : [ZG] Europe Mots-clés : critère d'Ellenberg consortium européen flore Résumé : "The newly introduced indicator values are compatible with the original Ellenberg values. They can be used for large-scale studies of the European flora and vegetation or for gap-filling in regional data sets. The European indicator values and the original and taxonomically harmonized regional data sets of Ellenberg-type indicator values are available in the Supporting Information and the Zenodo repository." (source : auteurs) Type de publication : périodique Référence biblio : Tichý L., et al., 2023 - Ellenberg-type indicator values for European vascular plant species. Journal of Vegetation Science, 34 (1) : e13168. Autre URL associée : tableau des valeurs ID PMB : 71276 En ligne : https://zenodo.org/records/7427088 Format de la ressource électronique : base Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71276
in Journal of Vegetation Science > vol. 34, n°1 (Année 2023) . - e13168[article]Exemplaires(0)
Disponibilité aucun exemplaire Formalized reproduction of an expert-based phytosociological classification : A case study of subalpine tall-forb vegetation / Martin Ko?í in Journal of Vegetation Science, vol. 14, n°4 (Année 2003)
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Titre : Formalized reproduction of an expert-based phytosociological classification : A case study of subalpine tall-forb vegetation Type de document : texte imprimé Auteurs : Martin Ko?í, Auteur ; Milan Chytrý, Auteur ; Lubomír Tichý, Auteur Année de publication : 2003 Article en page(s) : pp. 601-610 Langues : Anglais (eng) Résumé : "Delimitation of vegetation units in phytosociology is traditionally based on expert knowledge. Applications of expert‐based classifications are often inconsistent because criteria for assigning relevés to vegetation units are seldom given explicitly. Still, there is, e.g. in nature conservation, an increasing need for a consistent application of vegetation classification using computer expert systems for unit identification." Type de publication : périodique Référence biblio : Ko?í M., Chytrý M., Tichý L., 2003 - Formalized reproduction of an expert-based phytosociological classification : A case study of subalpine tall-forb vegetation. Journal of Vegetation Science, 14 (4) : 601-610. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66153
in Journal of Vegetation Science > vol. 14, n°4 (Année 2003) . - pp. 601-610[article]Exemplaires(0)
Disponibilité aucun exemplaire Heterogeneity-constrained random resampling of phytosociological databases / Attila Lengyel in Journal of Vegetation Science, vol. 22, n°1 (Année 2011)
PermalinkJUICE, software for vegetation classification / Lubomír Tichý in Journal of Vegetation Science, vol. 13, n°3 (Année 2002)
PermalinkModified TWINSPAN classification in which the hierarchy respects cluster heterogeneity / Jan Rolecek in Journal of Vegetation Science, vol. 20, n°4 (Année 2009)
PermalinkNew similarity indices for the assignment of relevés to the vegetation units of an existing phytosociological classification / Lubomír Tichý in Plant ecology, vol. 179, n°1 (Juillet 2005)
PermalinkOptimClass : Using species-to-cluster fidelity to determine the optimal partition in classification of ecological communities / Lubomír Tichý in Journal of Vegetation Science, vol. 21, n°2 (Année 2010)
PermalinkStatistical determination of diagnostic species for site groups of unequal size / Lubomír Tichý in Journal of Vegetation Science, vol. 17, n°6 (Année 2006)
PermalinkStratified resampling of phytosociological databases : Some strategies for obtaining more representative data sets for classification studies / Ilona Knollová in Journal of Vegetation Science, vol. 16, n°4 (Année 2005)
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