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Auteur Brohumil Mandak |
Documents disponibles écrits par cet auteur (3)
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Titre : Catalogue of alien plants of the Czech Republic Type de document : Électronique Auteurs : Petr Pyšek ; Jiří Sádlo (1958-) ; Brohumil Mandak Année de publication : 2002 Article en page(s) : 97-186 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes
[CBNPMP-Géographique] République TchèqueRésumé : Alien flora of the Czech Republic is presented. In Appendix 1, 1378 alien taxa (33.4% of the total flora) are listed with information on the taxonomic position, origin, invasive status (casual, naturalized, invasive; a new category post-invasive is introduced), time of immigration (archaeophytes vs. neophytes), habitat type invaded (natural, seminatural, human-made), vegetation invaded (expressed as occurence in phytosociological alliances), mode of introduction into the country (accidental, deliberate), and date of the first record. Number of phytogeographical as well as biological and ecological attributes were compiled for each species in the database; its structure is presented in Appendix 2 as a suggestion for similar work elsewhere. Czech alien flora consists of 24.1% of taxa which arrived before 1500 (archaeophytes) and 75.9% neophytes. There are 891 casuals, 397 naturalized and 90 invasive species. Of introduced neophytes, 21.9% became naturalized, and 6.6% invasive. Hybrids contribute with 13.3% to the total number of aliens, and the hybridization is more frequent in archaeophytes (18.7%) than in neophytes (11.7%). If the 184 hybrids are excluded from the total number of aliens, there are 270 archaeophytes and 924 neophytes in the Czech flora, i.e. total of 1195 taxa. Accidental arrivals account for 53.4% of all taxa and deliberate introduction for 46.6%; the ratio is reversed for neophytes considered separately (45.5 vs. 54.5%). Majority of aliens (62.8%) are confined to human- made habitats, 11.0% were recorded exclusively in natural or seminatural habitats, and 26.2% occur in both types of habitat. Archaeophytes and neophytes occur in 66 and 83 alliances, respectively, of the phytosociological system. Flora is further analysed with respect to origin, life histories, life forms and strategies. Only 310 species (22.4% of the total number of all alien taxa) are common or locally abundant; others are rare, based on a single locality or no longer present. The following 19 taxa are reported as new for the Czech alien flora: Agrostis scabra, Alhagi pseudalhagi, Allium atropurpureum, Bromus hordeaceus subsp. pseudothominii, Carduus tenuiflorus, Centaurea ×gerstlaueri, Centaurea nigra ×phrygia, Cerastium ×maureri, Gilia capitata, Helianthus strumosus, Hieracium pannosum, Hordeum leporinum, Oenothera coronifera, Papaver atlanticum subsp. mesatlanticum, Parietaria pennsylvanica, Polypogon fugax, Rodgersia aesculifolia, Sedum pallidum var. bithynicum, Sedum stoloniferum; these represent results of our own field research as well as of herbaria search, and unpublished data from colleagues. Other 44 taxa are reported as escaping from cultivation for the first time. Twenty two archaeophytes are listed in the Red List of the Czech flora. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142018
in Preslia > 74 (2002) . - 97-186Pyšek, Petr, Sádlo, Jiří (1958-), Mandak, Brohumil 2002 Catalogue of alien plants of the Czech Republic. Preslia, 74: 97-186.Documents numériques
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Article (2002)Adobe Acrobat PDFGenome size as a marker for identifying the invasive alien taxa in Fallopia section Reynoutria / Jan Suda in Preslia, 82 (2010)
Titre : Genome size as a marker for identifying the invasive alien taxa in Fallopia section Reynoutria Type de document : Électronique Auteurs : Jan Suda ; Pavel Travnicek ; Brohumil Mandak ; Katterina Berchova-Bimova Année de publication : 2010 Article en page(s) : 97-106 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Fallopia Résumé : DAPI and propidium iodide flow cytometry were used to determine the variation in genome size in 166 samples and of all taxa and ploidy levels of Fallopia section Reynoutria (knotweeds) recorded in the Czech Republic. Significant differences were detected in the amount of nuclear DNA, associated with the ploidy levels and taxonomic identity of the material. At each ploidy level, F. sachalinensis showed the lowest and F. japonica the highest fluorescence intensities. The fluorescence values for the hybridogenous F. ×bohemica were located in-between these two levels. In most cases, there was at least a four-percent gap in fluorescence values between the nearest neighbours belonging to a different taxon. Intraspecific variation in genome size was very low in all taxa except hexaploid F. ×bohemica; this could be due to the complex evolutionary history of this taxon. Our results indicate that the amount of nuclear DNA can be used as a reliable marker for the identification of homoploid knotweed species and their hybrids. Different evolutionary pathways for the origin of high polyploids and/or hybridogenous taxa are proposed based on genome size. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142558
in Preslia > 82 (2010) . - 97-106Suda, Jan, Travnicek, Pavel, Mandak, Brohumil, Berchova-Bimova, Katterina 2010 Genome size as a marker for identifying the invasive alien taxa in Fallopia section Reynoutria. Preslia, 82: 97-106.Documents numériques
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Article (2010)Adobe Acrobat PDFVegetative regeneration in invasive Reynoutria (Polygonaceae) taxa : the determinant of invasibility at the genotype level / Petr Pyšek (2003)
Titre : Vegetative regeneration in invasive Reynoutria (Polygonaceae) taxa : the determinant of invasibility at the genotype level Type de document : Tiré à part de revue Auteurs : Petr Pyšek ; John H. Brock (1944-) ; Brohumil Mandak ; Vojtěch Jarošík (1958-2013) ; Irena Koukolikova ; Jan Pergl (1977-) ; Jan Stepanek Année de publication : 2003 Importance : 1487-1495 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Changement d'échelle, extension
[CBNPMP-Thématique] Génétique (espèce)
[CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes
[CBNPMP-Thématique] Reproduction végétativeMots-clés : Reynoutria japonica Houtt. Reynoutria sachalinensis (Friedrich Schmidt Petrop.) N Reynoutria x-bohemica Chrtek & Chrtkova Résumé : Vegetative regeneration of individual genotypes of Asian Reynoutria taxa, which are invasive in the Czech Republic, was studied in R. sachalinensis (five genotypes), R. japonica (a single genotype present in the country), and their hybrid R. ×bohemica (nine genotypes). Identity of genotypes was confirmed by isozyme analysis. Ten rhizome segments of each genotype were planted in a randomized block design. After 30 d, the regeneration rate of each genotype was measured as the proportion of rhizomes that produced shoots. Emergence time and final mass of each shoot were recorded. The regeneration rate and final shoot mass were significantly affected by genotype in R. ×bohemica but not in R. sachalinensis. In R. ×bohemica, easily regenerating genotypes grew faster. Regeneration characteristics that crucially contribute to the fitness of these vegetatively spreading plants are closely related to each other. In genotypes with a low regeneration rate, early-emerging shoots produced more biomass, while in those with a high regeneration rate, shoot mass was independent of emergence time. Mean clone size recorded in the field was marginally significantly related to emergence time during regeneration; regeneration characteristics might thus affect the extent of R. ×bohemica invasion at a regional scale. Hybrids genetically intermediate between the parents regenerated better than those closely related to parents. Novel hybrid invasive genotypes may be produced by rare sexual reproduction, fixed by clonal growth, and present a previously unknown threat to native vegetation. Lien pérenne : DOI : 10.3732/ajb.90.10.1487 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=131491 Pyšek, Petr, Brock, John H. (1944-), Mandak, Brohumil, Jarošík, Vojtěch (1958-2013), Koukolikova, Irena, Pergl, Jan (1977-), Stepanek, Jan 2003 Vegetative regeneration in invasive Reynoutria (Polygonaceae) taxa : the determinant of invasibility at the genotype level. American Journal of Botany, 90(10) : 1487-1495.Documents numériques
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