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Alien plants in checklists and floras : towards better communication between taxonomists and ecologists / Petr Pysek in Taxon, vol. 53, n°1 (Année 2004)

Public [article]  inTaxon > vol. 53, n°1 (Année 2004) . - pp. 131-143 Titre : Alien plants in checklists and floras : towards better communication between taxonomists and ecologists Type de document : texte imprimé Auteurs : Petr Pysek, Auteur ; David M. Richardson, Auteur ; Marcel Rejmánek, Auteur ; G. L. Webster, Auteur ; M. Williamson, Auteur Année de publication : 2004 Article en page(s) : pp. 131-143 Langues : Anglais (eng) Mots-clés : plante invasive  invasion biologique  plante exotique  hybride  plante native  naturalisation  terminologie  graine Résumé : "The number of studies dealing with plant invasions is increasing rapidly, but the accumulating body of knowledge has unfortunately also spawned increasing confusion about terminology. Invasions are a global phenomenon andcomparison of geographically distant regions and their introduced biota is a crucially important methodological approach for elucidation of the determinants of invasiveness and invasibility. Comparative studies of alien floras provide substantial new insights to our understanding of general patterns of plant invasions. Such studies, using information in previously published floras and checklists, are fundamentally dependent on the quality of the assessment of particular species with respect to their taxonomic identity, time of immigration and invasion status. Three crucial decisions should be made when defining the status of a plant species in a given region: (1) whether the taxon is native or alien to that region (origin status); (2) what is its position in the invasion process, i.e., when was it introduced (residence status); and (3) what is the degree of its naturalization and possible invasion (invasion status). Standard floras differ hugely in their treatment of non-native species and those with appropriate categorization of alien species according to their status are rather rare. The present paper suggests definitions of terms associated with plant invasions and places these into the context of floras. Recommendations are outlined on how to deal with the issue of plant invasions in standard floras with the aim of contributing to a better understanding between taxonomists and ecologists and allowing more detailed comparative analyses of alien floras of various regions of the world." (source : auteurs) Type de publication : périodique Référence biblio : Pysek P., Richardson D., Rejmánek M., Webster G.-L., Williamson M., 2004 - Alien plants in checklists and floras : towards better communication between taxonomists and ecologists. Taxon, 53 (1) : 131-143. ID PMB : 33297 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=33297 [article]

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Divergent adaptations in different parts of introduced range in tetraploid Vicia cracca / Zuzana Líblová in Flora, vol. 234 (Année 2017)

Public [article]  inFlora > vol. 234 (Année 2017) . - pp. 245-255 Titre : Divergent adaptations in different parts of introduced range in tetraploid Vicia cracca Type de document : texte imprimé Auteurs : Zuzana Líblová, Auteur ; Anezka Eliasova, Auteur ; Zuzana Münzbergová, Auteur Année de publication : 2017 Article en page(s) : pp. 245-255 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Vicia cracca [ZG] Amérique du nord [ZG] Europe Mots-clés : capacité d'adaptation  cytotype  plante native  plante invasive  plante polyploïde Résumé : "Understanding causes of species invasiveness is a necessary condition for effective mitigation of invasive species. One of the key characteristics supporting species invasiveness may be species ability to adapt to wide range of environmental conditions. It has been hypothesized that increased ability to adapt to wide range of conditions may be related to polyploidization. Experimental studies comparing the ability to adapt to novel conditions between native and invasive populations of different cytotypes of the same species are, however, still largely missing. We used Vicia cracca, a species known to occur in two different cytotypes in its native range in Europe and being an important invader in North America. We investigate if known cytotypes of Vicia cracca from the native and invasive range differ in their ability to adapt to environmental variation. To do this, we grew plants of both cytotypes from the native and invasive range in a common garden and exposed half of the plants to experimental shading to simulate environmental variation potentially occurring at the localities of the species. The study confirmed previous expectation that only polyploid plants occur in the invasive range. The study, however, did not support the expectation that the tetraploids would be superior to the diploids from the native range or have better ability to cope with shading. The performance and plasticity of tetraploids from the invasive range was in most cases different from the European tetraploids and differed between the two areas in the invasive range. This may suggest that the tetraploids underwent strong post-invasive evolution and have adapted in different ways to the specific condition of the different parts of the invaded area. Alternatively, it may indicate that the invasive range was created by colonizers from different areas possessing distinct adaptations." (source : auteurs) Type de publication : périodique Référence biblio : Líblová Z., Eliasova A., Münzbergová Z., 2017 - Divergent adaptations in different parts of introduced range in tetraploid Vicia cracca. Flora, 234 : 245-255. DOI : 10.1016/j.flora.2017.07.010 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66246 [article]

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