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Dépouillements
Ajouter le résultat dans votre panierColonization potential of an endangered riparian shrub species / Sabine Fink in Biodiversity and Conservation, vol. 26, n°9 (Août 2017)
Titre : Colonization potential of an endangered riparian shrub species Type de document : texte imprimé Auteurs : Sabine Fink, Auteur ; Tabea Lanz, Auteur ; Rebecca Stecher, Auteur ; Christoph Scheidegger, Auteur Année de publication : 2017 Article en page(s) : pp. 2099–2114 Langues : Anglais (eng) Catégories : [habitats/milieux] 2 - Milieux aquatiques non marins
[habitats/milieux] ZH - Zones humides
[Espèces (in biblio)] Myricaria germanica
[ZG] EuropeMots-clés : communauté végétale perte d'habitat graine germination conservation Résumé : "Riparian areas and their plant communities are threatened due to human exploitation and habitat loss. Conservation of riparian vegetation requires knowledge on limiting factors in the biology of species preventing its spread along suitable areas. It needs to be assessed if an endangered species is trapped in an extinction vortex or whether it can recover from its current bottleneck situation by management measurements. We investigate the recovery potential of an endangered riparian shrub species of European rivers, the German tamarisk, Myricaria germanica, by combining field and lab experiments on seed production, germination and wind dispersal with a modelling approach on species distribution. While the seed potential is high, wind-mediated dispersal is average, with a majority of seeds falling next to the mother shrub. The modelled dispersal kernel shows highest goodness-of-fit with a polynomic function. Including this kernel in a model on the future distribution of the species based on identification of suitable habitat, limited spread to new areas in Switzerland after 20 and 50 dispersal events is predicted. Given the current limited distribution of the German tamarisk in Switzerland, conservation efforts are required to allow for the formation of new riparian habitat. Additionally, connectivity along river networks has to be enhanced to help the species to escape the extinction vortex it is trapped in." (source : auteurs) Type de publication : périodique Référence biblio : Fink S., Lanz T., Stecher R., Scheidegger C., 2017 - Colonization potential of an endangered riparian shrub species. Biodiversity and Conservation, 26 (9) : 2099–2114. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66256
in Biodiversity and Conservation > vol. 26, n°9 (Août 2017) . - pp. 2099–2114[article]Exemplaires(0)
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Titre : Trading populations-can biodiversity offsets effectively compensate for population losses ? Type de document : texte imprimé Auteurs : David Tierney, Auteur ; Karen Dorothy Sommerville, Auteur ; Katherine E. Tierney, Auteur ; Caroline L. Gross, Auteur Année de publication : 2017 Article en page(s) : pp. 2115–2131 Langues : Anglais (eng) Mots-clés : Species pool Résumé : "Biodiversity offsetting promotes the protection or restoration of biodiversity at one site to compensate for the loss of biodiversity due to development at another site. Thus populations of species at a development site may be extirpated in the belief that offsetting elsewhere will compensate for the loss of biodiversity. In this study we tested the replaceability of roadside populations of the orchid Diuris platichila threatened by development (populations 1–5, n = 50–541 plants) with a potential offset population occurring in nearby natural vegetation (population 6, n = 143 plants). We measured differences in habitat among the populations and associated differences in flowering and fruiting. We also measured genotypic diversity within and among the populations, and the capacity of soil from each population to promote the symbiotic germination of outcrossed seed from the two largest populations (populations 1–2). An evaluation of the performance of the relevant offset policy was also undertaken which was informed by these studies. Compared to the roadside populations, the potential offset site had limited flowering (except after fire) and was genotypically less diverse. Soil from the potential offset site, and populations 2, 3 and 5, supported significantly less seed germination than soil from population 1. Translocating individuals from the most genotypically diverse populations into the offset population could help to buffer against the loss of genetic diversity if offsetting was required; however, the limited reproduction and recruitment opportunities at the offset site could result in the eventual erosion of any initial increase in diversity. The offset policy failed to secure a suitable offset for a hypothesized loss of plants. More generally we conclude that offsetting approaches which do not assess genotypic diversity and recruitment capacity may fail in their objective of protecting species and that maintaining populations in safe sites may be required." Type de publication : périodique Référence biblio : Tierney D., Sommerville K., Tierney K., Gross C., 2017 - Trading populations-can biodiversity offsets effectively compensate for population losses ? Biodiversity and Conservation, 26 (9) : 2115–2131. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66257
in Biodiversity and Conservation > vol. 26, n°9 (Août 2017) . - pp. 2115–2131[article]Exemplaires(0)
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