[article]
| Titre : |
Crassula helmsii (T. Kirk) Cockayne - Standortansprüche, Verbreitung und Vergesellschaftung eines invasiven Neophyten auf Norderney |
| Titre original : |
Crassula helmsii (T. Kirk) Cockayne - Habitat requirements, distribution and vegetation community composition of an alien invasive species on Norderney |
| Type de document : |
texte imprimé |
| Auteurs : |
Markus Prinz, Auteur ; Cord Peppler-Lisbach, Auteur ; Annika Weidhüner, Auteur ; Holger Freund, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
pp. 267-286 |
| Langues : |
Allemand (ger) |
| Catégories : |
[ZG] Allemagne Use for events before 1949 and after October 1990.
[Espèces (in biblio)] Crassula helmsii
[Thèmes] Plante aquatique
|
| Mots-clés : |
plante invasive macrophyte habitat relevé phytosociologique |
| Résumé : |
"Crassula helmsii is a semi-aquatic, invasive neophyte from Australia and New Zealand. It was first recorded on the East Frisian island Norderney in the early 2000s. Since then, it has been spreading rapidly into the Südstrandpolder and the Meierei-Wiesen. To date, there are no scientific studies on the habitat requirements and distribution of C. helmsiialong the coastal zone of Northwest Germany. Therefore, the aim of this study was to examine the distribution, vegetation community composition and habitat requirements, as well as the preconditions for dispersal of C. helmsiion Norderney through habitat modelling. The habitat requirements were analysed based on 44 presence and 44 absence points of C. helmsii; these were generated using GIS-based stratified random sampling. Additional vegetation relevés were conducted at 22 presence points. Several associated species were identified: Mentha aquatica, Phragmites australis, Rubus caesius, Myosotis scorpioides and Rumex conglomeratus. It is likely that these are remnants of the original vegetation. To identify habitat requirements, some general-ized linear models were generated. The final model included the parameters conductivity, light and shore characteristics. Crassula helmsii preferred flat, unshaded aquatic spots with a conductivity of less than 2000 μS/cm. The model shows that the majority of all potential habitats in the study area are already occupied by C. helmsii. Further propagation of C. helmsiito the coastal dunes or dune slacks is likely and should be avoided. The presented model provides some possible management approaches, the most promising is a combination of controlled salinization and shading." (source : auteurs) |
| Type de publication : |
périodique |
| Référence biblio : |
Prinz M., Peppler-Lisbach C., Weidhüner A., Freund H., 2019 - Crassula helmsii (T. Kirk) Cockayne - Standortansprüche, Verbreitung und Vergesellschaftung eines invasiven Neophyten auf Norderney. Tuexenia, 39 : 267-286. |
| ID PMB : |
69557 |
| Permalink : |
http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69557 |
in Tuexenia > vol. 39 (Année 2019) . - pp. 267-286
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