A partir de cette page vous pouvez :
| Retourner au premier écran avec les dernières notices... |
Résultat de la recherche
2 résultat(s) recherche sur le mot-clé 'Species pool' 
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la recherche Générer le flux rss de la rechercheEffects of landscape composition, species pool and time on grassland specialists in restored semi-natural grasslands / Emelie Waldén in Biological conservation, vol. 214 (Octobre 2017)
Titre : Effects of landscape composition, species pool and time on grassland specialists in restored semi-natural grasslands Type de document : Livre Auteurs : Emelie Waldén, Auteur ; Erik Öckinger, Auteur ; Marie Winsa, Auteur ; Régina Lindborg, Auteur Année de publication : 2017 Article en page(s) : pp. 176-183 Langues : Anglais Mots-clés : biodiversité Landscape composition Recolonisation restauration Semi-natural grassland Species pool Résumé : "Habitat restoration is an important complement to protecting habitat for the conservation of biodiversity. Semi-natural grasslands are target habitats for ecological restoration in temperate Europe. Restoration of abandoned semi-natural grasslands often relies on spontaneous colonisation of plant species from the soil seed bank or the surrounding landscape. Although many studies show that the regional species pool is important for upholding local diversity, its effect on restoration outcome in semi-natural grasslands is poorly known. In this multi-landscape study, we examined grassland specialist species occurring in restored grasslands and the effect of specialist species pool, landscape composition and local temporal factors. We found that specialist richness and frequency was positively affected by specialist richness and frequency in the surrounding landscape. Specialist richness in the restored grasslands also increased with time since restoration. Moreover, specialist frequency in the restored grassland increased with the proportion of semi-natural and remnant grassland habitats in the landscape. We also found a positive relationship between the proportion of species occurring in both the restored grassland and its surrounding landscape and time since restoration, in landscapes with high proportions of semi-natural grasslands. This suggests that both temporal factors, as well as the landscape composition and species pool, affect plant recolonisation in restored semi-natural grasslands." Type de publication : périodique Référence biblio : Waldén E., Öckinger E., Winsa M., Lindborg R., 2017 - Effects of landscape composition, species pool and time on grassland specialists in restored semi-natural grasslands. Biological conservation, 214 : 176-183. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66248
in Biological conservation > vol. 214 (Octobre 2017) . - pp. 176-183[article]Exemplaires
Cote Localisation Disponibilité aucun exemplaire
Titre : Trading populations-can biodiversity offsets effectively compensate for population losses ? Type de document : Livre 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 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
Cote Localisation Disponibilité aucun exemplaire
