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Partager le résultat de cette rechercheCompetitive strength of Australian swamp stonecrop (Crassula helmsii) invading moorland pools / Emiel Brouwer in Aquatic Invasions, vol. 12, n°3 (Année 2017)
Titre : Competitive strength of Australian swamp stonecrop (Crassula helmsii) invading moorland pools Type de document : texte imprimé Auteurs : Emiel Brouwer ; Luc Denys ; Esther C.H.E.T Lucassen ; Martijn Buiks ; Thierry Onkelinx Année de publication : 2017 Article en page(s) : pp. 321-331 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Crassula helmsii
[Espèces (in biblio)] Hypericum elodes
[Espèces (in biblio)] Littorella unifloraMots-clés : concurrence interspécifique plante invasive plante aquatique Résumé : "We conducted two indoor experiments to test the competitive strength of the invasive plant Crassula helmsii in comparison to that of two native moorland species from northwest Europe, Littorella uniflora and Hypericum elodes in terrestrial conditions. In both experiments nutrient-poor moorland soil was used. The total cover of C. helmsii increased gradually in monocultures, until after 7–20 weeks a maximum of 12% in experiment 1 and 15–20% in experiment 2 was reached in the control conditions. Nitrogen content of C. helmsii plants was very low at the end of the latter experiment. Adding additional N had little effect in experiment 1, but in experiment 2 C. helmsii cover doubled. In the mixed cultures, C. helmsii fared worse than the native species. In experiment 1 the increase in cover was higher for both L. uniflora and H. elodes than in their monocultures, while in experiment 2 fresh weight at the end of the experiment was 3 times higher for L. uniflora and did not differ significantly between H. elodes and C. helmsii. The results indicate that the native species are better competitors for nutrients than C. helmsii due to their larger root system. No allelopathic effect of L. uniflora on C. helmsii growth was observed. These observations are discussed in the light of C. helmsiimanagement in the field." (source : auteurs) Type de publication : périodique Référence biblio : Brouwer E., Denys L., Lucassen E.-H.-E.-T., Buiks M., Onkelinx T., 2017 - Competitive strength of Australian swamp stonecrop (Crassula helmsii) invading moorland pools. Aquatic Invasions, 12 (3) : 321-331. En ligne : http://www.aquaticinvasions.net/2017/AI_2017_Brouwer_etal.pdf Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68346
in Aquatic Invasions > vol. 12, n°3 (Année 2017) . - pp. 321-331[article]Exemplaires(0)
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Titre : Reproduction of Crassula helmsii by seed in western Europe Type de document : texte imprimé Auteurs : Bram D'hondt, Auteur ; Luc Denys, Auteur ; Wim Jambon, Auteur ; Roeland De Wilde, Auteur ; Tim Adriaens, Auteur ; Jo Packet, Auteur ; Johan van Valkenburg, Auteur Année de publication : 2016 Article en page(s) : pp. 125-130 Langues : Anglais (eng) Catégories : [habitats/milieux] 2 - Milieux aquatiques non marins
[Espèces (in biblio)] Crassula helmsii (Kirk) Cockayne
[Thèmes] ReproductionMots-clés : plante invasive germination Résumé : "The amphibious plant species Crassula helmsii is a widely established and still-spreading alien in various parts of Europe, where it is considered invasive as its dense swards stress the viability of local biota. The species was considered to exclusively reproduce through vegetative means, until ex situ germination was recorded from a single locality in Belgium. We assessed whether this seed viability holds on a wider scale, by testing 16 populations from The Netherlands, Belgium, northern France, eastern England and northern Germany in a greenhouse germination experiment. Seedlings were observed from all populations but two, and from each of the five countries. Although most fruits were lacking seeds and the inferred germination percentages were overall low, germinable seed numbers are considerable given the high density of flowering stems. An in situ test revealed seeds to make it through normal winter conditions without signs of physical damage and with retention of germinability. Our results suggest that reproduction by seed is a relatively cryptic but widespread phenomenon throughout western Europe. The persistency of seed banks requires further investigation. Nonetheless, these findings already challenge the efficacy of techniques currently applied in C. helmsii control." (source : auteurs) Type de publication : périodique Référence biblio : D'hondt B., Denys L., Jambon W., De Wilde R., Adriaens T., Packet J., van Valkenburg J., 2016 - Reproduction of Crassula helmsii by seed in western Europe. Aquatic Invasions, 11 (2) : 125-130. ID PMB : 64717 En ligne : https://data.inbo.be/purews/files/11897469/AI_2016_Dhondt_etal.pdf Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=64717
in Aquatic Invasions > vol. 11, n°2 (Année 2016) . - pp. 125-130[article]Exemplaires(0)
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