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Auteur Annette Otte |
Documents disponibles écrits par cet auteur (2)
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la rechercheFuture challenge for endangered arable weed species facing global warming : Low temperature optima and narrow moisture requirements / Theresa Rühl in Biological conservation, vol. 182 (Février 2015)
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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Titre : Relationships between plant diversity, vegetation cover, and site conditions: implications for grassland conservation in the Greater Caucasus Type de document : texte imprimé Auteurs : M. Wiesmair, Auteur ; Annette Otte, Auteur ; Rainer Waldhardt, Auteur Année de publication : 2017 Article en page(s) : pp. 273–291 Langues : Anglais (eng) Résumé : "Overgrazing, land use abandonment and increasing recreational activities have altered the vegetation of high-montane and subalpine grassland of the Caucasus. The failure of previous restoration efforts with unsuitable and exotic plant species indicates the need for information on the present vegetation and in which way it might change. Within the Greater Caucasus, we have described and quantified the mountain grassland which develops under characteristic overgrazed and eroded site conditions. Further, we have proposed potential native plant species for revegetation to restore and conserve valuable mountain grassland habitats. We used non-metric dimensional scaling ordination and cluster comparison of functional plant groups to describe a gradient of grassland vegetation cover. For our study region, we identified four major vegetation types with increasing occurrence of ruderal pasture weeds and tall herb vegetation on abandoned hay meadows within the subalpine zone. Within high-montane grassland a decline of plant diversity can be observed on sites of reduced vegetation cover. Due to a low potential of the grassland ecosystem to balance further vegetation cover damage, the long-term loss of diverse habitats can be expected. We conclude with management recommendations to prevent erosion and habitat loss of precious mountain grasslands. " Type de publication : périodique Référence biblio : Wiesmair M., Otte A., Waldhardt R., 2017 - Relationships between plant diversity, vegetation cover, and site conditions: implications for grassland conservation in the Greater Caucasus. Biodiversity and Conservation, 26 (3) : 273–291. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66265
in Biodiversity and Conservation > vol. 26, n°3 (Mars 2017) . - pp. 273–291[article]Exemplaires(0)
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