Lisières, nouvel élément de compensation écologique

Avec l’ordonnance sur la qualité écologique, la mise en réseau d’écosystèmes proches de la nature est devenue une tâche prioritaire de la compensation écologique. Les lisières riches en espèces sont des éléments de connexion tout à fait appropriés. Les résultats de nos travaux de recherche ont montré que les lisières pouvaient contribuer à renaturer et à diversifier le paysage cultivé. Elles ne produisent que peu de mauvaises herbes (salissement) et n’accroissent pas l’activité des parasites dans les cultures limitrophes davantage que d’autres bordures de champs. En outre, les lisières riches en espèces sont appréciées des promeneurs et des agriculteurs

Ein Blick zurück nach vorn: 50 Jahre Engagement für Umwelt- und Nachhaltigkeitsforschung

ISSN:0940-555

Aesthetic quality of agricultural landscape elements in different seasonal stages in Switzerland

Maintenance of the agricultural landscape, preservation of biodiversity and landscape aesthetics are part of a multifunctional agriculture. However, little is known about the influence of single agricultural landscape elements in different seasonal stages on landscape aesthetics. In a Swisswide photo survey, the aesthetic preferences of Swiss residents for typical agricultural landscape elements in the Swiss lowlands were investigated. Photographs of seven ecological compensation areas (ECAs) and seven other elements (crops, high-intensity meadows and pastures) were selected. Each element was presented in four to six different seasonal stages, each on single paper-based questionnaire pages to allow a random selection of elements and seasonal stages. In addition, each element was replicated in each seasonal stage. Four randomly selected elements were sent to each study participant for aesthetic valuation (preference rating scores). Overall, ECAs received higher preference ratings than crops or high-intensity grassland. Most preferred were ECAs with a vertical structure, i.e. trees and bushes, and species-rich elements. In addition, the seasonal stage of a landscape element strongly influenced preference ratings. Flowering stages were clearly liked most. Moreover, perceived diversity and naturalness of an element had a strong positive effect on its rating. The results indicate that ECAs, besides their ecological function, are powerful elements to enhance the public's preference for agricultural landscapes. Moreover, the results might be useful for the development and adaptation of quantitative methods to capture the aesthetic value of agricultural regions and might provide a basis for political decisions concerning direct payments for aesthetic services of agriculture

The integration of biodiversity education in the initial education of primary school teachers: four comparative case studies from Europe

In this article, we present results from an international research study on biodiversity education in pre-service education of primary school teachers. The study was carried out between 2004-2006 in four teacher education institutions in Cyprus, England, Switzerland and Germany. We used document analyses and indepth interviews with 27 teacher educators and 22 student teachers to examine the integration of biodiversity into the pre-service teacher education programmes, and the student teachers' satisfaction with their respective education. In all teacher education institutions, aspects of biodiversity education were integrated mostly in the natural science modules which provided students at least with some information on the scientific aspects of biodiversity. Few modules included aspects of the controversial nature of biodiversity conservation in relation to economics, ethics, social and political concerns, and methodological approaches on how to deal with this. In the institutions in Cyprus, England and Germany the teaching focus was content-oriented, whereas in Switzerland a situated method-oriented approach was used. The student teachers in Switzerland felt more confident to teach about biodiversity in school. All interviewees thought it necessary to prepare primary school student teachers on how to address biodiversity in schools, and strategies on how best to achieve this are critically discussed

The influence of plant diversity on people's perception and aesthetic appreciation of grassland vegetation

The conservation of biodiversity critically depends on the value that humans attach to it. Apart from an ecological and economic value, an aesthetic value has often been assigned to biodiversity. However, it is not known whether lay people appreciate the diversity of species and not just certain individual species or nature as a whole. We studied in a series of experiments and field studies people’s perception and appreciation of species diversity. We presented meadow-like arrays of different species richness and evenness but random species composition to lay people and asked them to estimate plant species richness and rank the arrays by attractiveness. The experiments were complemented by two larger-scale field studies using natural meadows. Both in the experiments and the field studies the mean perception of species richness by people increased with true species richness, but was slightly overestimated at low and increasingly underestimated at high diversity levels. Lay people’s aesthetic appreciation of both the experimental grassland arrays and the natural meadows increased with true species richness. Communities consisting of the same number of species were perceived to be more species-rich and were appreciated more when their evenness was high. Our results demonstrate that plant diversity in itself is attractive to humans. The current reduction of the diversity of grasslands due to intensification of management may thus reduce the attractiveness of regions where grasslands are a dominant feature of the landscape. This could have negative consequences for tourism and may add an economic argument for the conservation of biodiversity in grasslands

Swiss people’s attitudes towards field margins for biodiversity conservation

Arable land in Switzerland harbours low biodiversity and lacks permanent species-rich structures. To remedy this situation,improved field margins(IFMs)will be introduced as a new ecological compensation type in the Swiss Lowlands. IFMs are extensively managed, sown species- and flower-rich vegetation strips which provide both habitats for a wide range of species and valuable structures for the ecological network. However, the success of ecological compensation measures depends strongly on their acceptance by farmers and the general public. In summer 2004, we investigated in a case study the attitudes of 108 Swiss people to IFMs directly in the field. Study participants were asked to rate the attractiveness of IFMs of different species richness and composition that were presented to them, to explain their rating and to estimate the number of species present. In addition, they were asked to imagine a field margin of their particular liking, to describe it, and to state their opinion on several aspects of IFMs. Study participants responded very positively to species-rich vegetation. The more species-rich an IFM was perceived to be, the more it appealed to them. Species richness and general diversity were named as the main reasons for a positive rating. Study participants strongly approved the establishment of improved field margins. The positive rating and high acceptance of IFMs in this study indicate that they may be a successful new tool for biodiversity enhancement in intensively used agricultural landscapes

Prospective observational cohort study on grading the severity of postoperative complications in global surgery research

Background The Clavien–Dindo classification is perhaps the most widely used approach for reporting postoperative complications in clinical trials. This system classifies complication severity by the treatment provided. However, it is unclear whether the Clavien–Dindo system can be used internationally in studies across differing healthcare systems in high- (HICs) and low- and middle-income countries (LMICs). Methods This was a secondary analysis of the International Surgical Outcomes Study (ISOS), a prospective observational cohort study of elective surgery in adults. Data collection occurred over a 7-day period. Severity of complications was graded using Clavien–Dindo and the simpler ISOS grading (mild, moderate or severe, based on guided investigator judgement). Severity grading was compared using the intraclass correlation coefficient (ICC). Data are presented as frequencies and ICC values (with 95 per cent c.i.). The analysis was stratified by income status of the country, comparing HICs with LMICs. Results A total of 44 814 patients were recruited from 474 hospitals in 27 countries (19 HICs and 8 LMICs). Some 7508 patients (16·8 per cent) experienced at least one postoperative complication, equivalent to 11 664 complications in total. Using the ISOS classification, 5504 of 11 664 complications (47·2 per cent) were graded as mild, 4244 (36·4 per cent) as moderate and 1916 (16·4 per cent) as severe. Using Clavien–Dindo, 6781 of 11 664 complications (58·1 per cent) were graded as I or II, 1740 (14·9 per cent) as III, 2408 (20·6 per cent) as IV and 735 (6·3 per cent) as V. Agreement between classification systems was poor overall (ICC 0·41, 95 per cent c.i. 0·20 to 0·55), and in LMICs (ICC 0·23, 0·05 to 0·38) and HICs (ICC 0·46, 0·25 to 0·59). Conclusion Caution is recommended when using a treatment approach to grade complications in global surgery studies, as this may introduce bias unintentionally