| Titre : |
Biotic and abiotic filters in translocation experiments with the three threatened plant species Gentiana cruciata L., Gentiana germanica Willd. and Myricaria germanica (L) Desv. |
| Type de document : |
texte imprimé |
| Auteurs : |
Olivier Magnin, Auteur ; University of Bern. Faculty of Science (Bern, Suisse), Organisme de soutenance |
| Année de publication : |
2021 |
| Importance : |
24 p. |
| Langues : |
Anglais (eng) |
| Catégories : |
[Espèces (in biblio)] Gentiana cruciata L.
[Espèces (in biblio)] Gentiana germanica Willd.
[Espèces (in biblio)] Myricaria germanica (L.) Desv.
[Thèmes] Conservation
[Thèmes] Plante à forte valeur patrimoniale
|
| Mots-clés : |
translocation d'espèce |
| Résumé : |
"Translocations are becoming a common tool for conservation of threatened plant species despite risk, cost and labor intensity. Next to the number of transplanted individuals and genetic diversity, the choice of suitable translocation sites with the right abiotic and biotic conditions is essential for translocation success. Understanding the role and impact of abiotic and biotic filters on early translocation success could therefore improve translocation practices.
Here we present two explorative translocation experiments. In a first translocation experiment we tested the influence of positive (facilitation) and negative biotic interactions (competition) of surrounding vegetation on early translocations success. We translocated 180 individuals of the threatened G. cruciata and G. germanica, under three treatment conditions: 1) transplanting into existing vegetation, 2) transplanting into bare ground after removal of existing vegetation, 3) transplanting together with common plant species of typical calcareous grasslands after removal of existing vegetation. In a second translocation experiment we examined the relationship of abiotic conditions and environmental stochasticity for the translocation success of the threatened M. germanica. 108 M. germanica individuals were translocated to three sites along the Kander river, covering different exposures to floods (height over water level) and a range of soil conditions (sandy to rocky).
Despite overall high gentian mortality after overwintering, G. cruciata survived better when planted directly into existing vegetation, benefiting mostly of higher soil moisture. This indicates density dependent facilitative effects of surrounding vegetation on early translocation success. G. germanica performance was not affected by translocation treatments. M. germanica performed best close to the water level although with decreased chance of survival due to higher risk of flooding. Optimal translocation sites should factor in this trade-off and spread around intermediate height levels. Additionally, germination was best on sandy substrate.
Our results suggest that surrounding vegetation could be used to increase early transplantation success and that this should be explored further to increase understanding of spatial and temporal effects of surrounding vegetation on transplants. Further, we want to stress the importance of site selection for translocation success and the impact that environmental stochasticity can have in some habitats. Lastly, explorative translocations in collaboration with practitioners enhance the value of translocation experiments, by advancing knowledge whilst supporting conservation efforts. Scientifically assisted translocations should be encouraged and close collaboration between conservation practitioners and plant ecologists fortified." (source : auteurs) |
| Type de publication : |
thèse, mémoire, stage |
| Référence biblio : |
Magnin O., 2021 - Biotic and abiotic filters in translocation experiments with the three threatened plant species Gentiana cruciata L., Gentiana germanica Willd. and Myricaria germanica (L) Desv. Master, thesis. Bern : University of Bern. Faculty of Science, 24 p. |
| ID PMB : |
72630 |
| En ligne : |
https://www.boga.unibe.ch/unibe/portal/microsites/micro_boga/content/e534323/e91 [...] |
| Format de la ressource électronique : |
document |
| Permalink : |
http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72630 |
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trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la rechercheBiotic and abiotic filters in translocation experiments with the three threatened plant species Gentiana cruciata L., Gentiana germanica Willd. and Myricaria germanica (L) Desv. / Olivier Magnin (2021)
