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Ajouter le résultat dans votre panierFactors threatening grassland specialist plants - A multi-proxy study on the vegetation of isolated grasslands / Balázs Deák in Biological conservation, vol. 204, n°B (Décembre 2016)
Titre : Factors threatening grassland specialist plants - A multi-proxy study on the vegetation of isolated grasslands Type de document : texte imprimé Auteurs : Balázs Deák, Auteur ; Orsolya Valkó, Auteur ; Péter Török, Auteur ; Béla Tóthmérész, Auteur Année de publication : 2016 Article en page(s) : pp. 255-262 Langues : Anglais (eng) Catégories : [ZG] Hongrie
[habitats/milieux] 3 - Landes, fruticées et prairies
[habitats/milieux] 8 - Terres agricoles et paysages artificielsMots-clés : schéma agro-environnemental fragmentation de l'habitat Kurgan steppe Résumé : "Land use changes have resulted in the loss and isolation of semi-natural habitats worldwide. In intensively used agricultural landscapes the remnants of natural flora only persist in small habitat islands embedded in a hostile matrix. In the steppe zone burial mounds, so-called kurgans, have the potential to preserve the natural flora and act as local biodiversity hotspots. Exploration of the factors driving biodiversity in isolated habitat fragments is crucial for understanding the ecological processes shaping their vegetation and for designing effective strategies for their protection. We sampled the vegetation of 44 isolated kurgans in East-Hungary and studied the effects of habitat area, slope, recent disturbance, past destruction and the level of woody encroachment on the species richness and cover of grassland specialist and problem species (competitor weedy species). We used model selection techniques and linear models for testing relevant factors affecting specialist species in grassland fragments. We found that the biodiversity conservation potential of kurgans is supported by their steep slopes, which provide adequate habitat conditions and micro-climate for steppic specialist plant species. Specialist species are threatened both by recent disturbances and encroachment of alien woody species, especially black locust. Factors supporting specialist species suppressed problem species by providing unfavourable environmental conditions and putting them at a competitive disadvantage. We identified that woody encroachment and current disturbances affect the vast majority of kurgans, posing a serious threat to grassland specialist species. Thus, there is an urgent need to integrate active conservation measures into the current passive protection of kurgans." (source : auteurs) Type de publication : périodique Référence biblio : Deák B., Valkó O., Török P., Tóthmérész B., 2016 - Factors threatening grassland specialist plants - A multi-proxy study on the vegetation of isolated grasslands. Biological conservation, 204 : 255-262. ID PMB : 65414 DOI : 0.1016/j.biocon.2016.10.023 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65414
in Biological conservation > vol. 204, n°B (Décembre 2016) . - pp. 255-262[article]Exemplaires(0)
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Titre : Assessing tidal marsh resilience to sea-level rise at broad geographic scales with multi-metric indices Type de document : texte imprimé Auteurs : Kenneth B. Raposa, Auteur ; Kerstin Wasson, Auteur ; Erik Smith, Auteur ; Jeffrey Crooks (Jeffrey A.), Auteur ; Patricia Delgado, Auteur ; Sarah Fernald (Sarah H.), Auteur ; Matthew Ferner (Matthew C.), Auteur ; Alicia Helms, Auteur ; Lyndie Hice (Lyndie A.), Auteur Année de publication : 2016 Article en page(s) : pp. 263-275 Langues : Anglais (eng) Catégories : [habitats/milieux] 1 - Habitats littoraux et halophile
[habitats/milieux] 5 - Tourbières et marais
[habitats/milieux] ZH - Zones humidesMots-clés : évaluation Système national de réserve de recherche estuarine (NERRS) résilience montée du niveau de la mer Résumé : "Tidal marshes and the ecosystem services they provide may be at risk from sea-level rise (SLR). Tidal marsh resilience to SLR can vary due to differences in local rates of SLR, geomorphology, sediment availability and other factors. Understanding differences in resilience is critical to inform coastal management and policy, but comparing resilience across marshes is hindered by a lack of simple, effective analysis tools. Quantitative, multi-metric indices are widely employed to inform management of benthic aquatic ecosystems, but not coastal wetlands. Here, we develop and apply tidal marsh resilience to sea-level rise (MARS) indices incorporating ten metrics that contribute to overall marsh resilience to SLR. We applied MARS indices to tidal marshes at 16 National Estuarine Research Reserves across the conterminous U.S. This assessment revealed moderate resilience overall, although nearly all marshes had some indication of risk. Pacific marshes were generally more resilient to SLR than Atlantic ones, with the least resilient marshes found in southern New England. We provide a calculation tool to facilitate application of the MARS indices to additional marshes. MARS index scores can inform the choice of the most appropriate coastal management strategy for a marsh: moderate scores call for actions to enhance resilience while low scores suggest investment may be better directed to adaptation strategies such as creating opportunities for marsh migration rather than attempting to save existing marshes. The MARS indices thus provide a powerful new approach to evaluate tidal marsh resilience and to inform development of adaptation strategies in the face of SLR." (source : auteurs) Type de publication : périodique Référence biblio : Raposa K., Wasson K., Smith E., Crooks J., Delgado P., Fernald S., Ferner M., Helms A., Hice L., 2016 - Assessing tidal marsh resilience to sea-level rise at broad geographic scales with multi-metric indices. Biological conservation, 204 : 263-275. ID PMB : 65415 DOI : 10.1016/j.biocon.2016.10.015 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65415
in Biological conservation > vol. 204, n°B (Décembre 2016) . - pp. 263-275[article]Exemplaires(0)
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Titre : Assessment of quality of input data used to classify ecosystems according to the IUCN Red List methodology : The case of the central Chile hotspot Type de document : texte imprimé Auteurs : Alberto Alaniz (Alberto J.), Auteur ; Mauricio Galleguillos, Auteur ; F. Perez-Quezada, Auteur Année de publication : 2016 Article en page(s) : pp. 378-385 Langues : Anglais (eng) Catégories : [ZG] Chili
[Thèmes] Critère UICN/IUCN
[Thèmes] Liste rougeMots-clés : écosystème niveau de menace qualité spatiale de l'information qualité temporelle de l'information Résumé : "During the last decade, the IUCN has developed criteria analogous to the Red List of Threatened Species to perform similar risk assessment on ecosystems, creating the Red List of Ecosystems methodology. One of the most significant challenges for the construction of these lists is the gathering and availability of the information needed to apply the criteria. We present a complement to the IUCN's methodology to assess the threat level to ecosystems, estimating the spatial and temporal quality of the information available in scientific publications. We did this by applying the IUCN criteria to determine the threat level to the sclerophyll ecosystems of central Chile. Spatially explicit studies that identify disturbances in the structure of the vegetation were selected, making it possible to quantify effectively the reduction in the ecosystems' distribution. The spatial and temporal quality of the assessment were estimated as the percentage of the potential ecosystem distribution and the time frame recommended by the IUCN (50 years), that the studies represented for each ecosystem. The application of the methodology allowed the assessment of a high percentage of the ecosystems (85%), which were classified based on the studies with ranges of temporal quality from 30 to 100% and spatial quality from 12 to 100%. If only the assessments with more than medium spatio-temporal quality are considered (> 50%), eight of the 17 evaluated ecosystems are classified in threat categories, which represents 22.9% of the study area." (source : auteurs) Type de publication : périodique Référence biblio : Alaniz A., Galleguillos M., Perez-Quezada F., 2016 - Assessment of quality of input data used to classify ecosystems according to the IUCN Red List methodology : The case of the central Chile hotspot. Biological conservation, 204 : 378-385. ID PMB : 65416 DOI : 10.1016/j.biocon.2016.10.038 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65416
in Biological conservation > vol. 204, n°B (Décembre 2016) . - pp. 378-385[article]Exemplaires(0)
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