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'risque d'extinction' 
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Partager le résultat de cette rechercheFuture extinction risk of wetland plants is higher from individual patch loss than total area reduction / David C. Dean in Biological conservation, vol. 209 (Mai 2017)
Titre : Future extinction risk of wetland plants is higher from individual patch loss than total area reduction Type de document : texte imprimé Auteurs : David C. Dean, Auteur ; Damien A. Fordham, Auteur ; Fangliang He, Auteur ; Corey Bradshaw (Corey J.A.), Auteur Année de publication : 2017 Article en page(s) : pp. 27-33 Langues : Anglais (eng) Catégories : [habitats/milieux] ZH - Zones humides Mots-clés : perte de zone Planification de la conservation risque d'extinction relation entre espèces diversité biologique perte d'habitat Résumé : "Quantifying the risk of extinction due to habitat loss is an increasingly urgent task for the design and implementation of effective conservation interventions. Methods based on species- and endemics-area relationships are well developed, but applications to date have concentrated primarily on the fragmentation of formerly continuous habitats such as forests and woodlands. Applying these area-based methods to predict extinction risk in habitat types occurring naturally as spatially discrete patches has been largely ignored. We address this knowledge gap using a network of seasonally connected wetlands. We modelled the risk of extinction associated with native wetland plant communities under two alternative scenarios: the loss of (i) entire wetlands (patch loss) versus (ii) an equivalent area distributed across the wetlands (area loss). Patch-loss scenarios resulted in more than twice the number of species going extinct than the equivalent loss of area. Extinction due to patch loss was highest when wetlands were removed in increasing size order (smallest to largest) – a plausible scenario arising from forecast climatic drying in the region. Small wetlands contained > 16% of endemic species in only < 5% of wetland area, largely explaining this result. Extinction risk associated with naturally occurring habitat patches depends on the distribution of regionally endemic species; where this is not solely a function of habitat area, the loss of small patches can represent higher risk than an equivalent reduction in total habitat area across the network." (source : auteurs) Type de publication : périodique Référence biblio : Dean D., Fordham D., He F., Bradshaw C., 2017 - Future extinction risk of wetland plants is higher from individual patch loss than total area reduction. Biological conservation, 209 : 27-33. ID PMB : 65411 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65411
in Biological conservation > vol. 209 (Mai 2017) . - pp. 27-33[article]Exemplaires(0)
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Titre : Future challenge for endangered arable weed species facing global warming : Low temperature optima and narrow moisture requirements Type de document : texte imprimé Auteurs : Theresa Rühl, Auteur ; Lutz Eckstein, Auteur ; Annette Otte, Auteur ; Tobias Donath, Auteur Année de publication : 2015 Article en page(s) : pp. 262-269 Langues : Anglais (eng) Mots-clés : biodiversité changement climatique risque d'extinction niche de germination plante rare température disponibilité d'eau Résumé : "As a result of the intensification of agriculture in Central Europe, many arable weed species have declined. Global climate change may further challenge the adaptability of arable weeds since plants may be more often subjected to higher temperatures and lower soil moisture during the germination period.
A climate chamber experiment analysed the response of four familial pairs of common and endangered arable weeds from Germany. To this end we used a large range of temperatures and water potentials to assess specific traits defining their germination requirements. Using a simple response surface approach, we predicted germination response under three climate change scenarios.
Results supported our expectation that endangered species, owing to their narrow germination requirements, may be more negatively affected by global warming than common species. Endangered species germinated significantly less than the common arable weeds, except at very low temperatures (3 °C and 5 °C). The preference of endangered arable weed species for low germination temperatures was confirmed by their low optimal germination temperature (15.8 °C ± 0.4). In contrast, common species germinated at significant higher temperatures (optimal temperature 18.4 °C ± 0.2), had a significantly wider range of germination temperature (endangered: 24 °C ± 3.5, common: 31 °C ± 0.5) and were also more flexible towards changes in water potential.
Calculations based on response surfaces for three climate change scenarios indicated that endangered arable weed species may benefit less from climate warming than common species."Type de publication : périodique Référence biblio : Rühl T., Eckstein L., Otte A., Donath T., 2015 - Future challenge for endangered arable weed species facing global warming : Low temperature optima and narrow moisture requirements. Biological conservation, 182 : 262-269. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67442
in Biological conservation > vol. 182 (Février 2015) . - pp. 262-269[article]Exemplaires(0)
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