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Reduzierung im Außer-Haus-Verzehr zu erleichtern, analysiert unsere Studie die Auswirkungen von zwei gängigen Interventionsstrategien zur Reduzierung von Speiseresten in einem ganzheitlichen Verhaltensmodell. Auf der Grundlage eines quasi-experimentellen Baseline-Interventions-Designs haben wir in einem Strukturgleichungsmodell untersucht, wie sich das Aushängen von Informationspostern und die Reduzierung von Portionsgrößen auf persönliche, soziale und umweltbezogene Faktoren auswirken. Anhand von Daten aus Online-Befragungen und Beobachtungen von 880 Gästen (503 Baseline, 377 Intervention) während zwei Wochen in einer Universitätsmensa erlaubt das vorgeschlagene Modell, die Effekte der beiden Interventionen auf die Tellerreste spezifischen Veränderungen von Verhaltensdeterminanten zuzuordnen. Es hat sich gezeigt, dass die Verringerung der Portionsgröße bei den Zielgerichten mit einer geringeren Menge an Tellerabfällen zusammenhängt, die auf bewusster Wahrnehmung, die sich in einer geringeren Bewertung der Portionsgröße ausdrückt. Die Auswirkungen des Sehens von Informationsplakaten auf veränderten persönlichen Einstellungen, subjektiven Normen und wahrgenommener Verhaltenskontrolle beruhen. Je nachdem, wie eine Person auf die Information reagiert (indem sie sich nur bemüht, alle Speisen aufzuessen, oder indem sie sich bemüht und zusätzlich ein anderes Gericht in der Kantine wählt), ergeben sich jedoch entgegengesetzte Auswirkungen auf diese Determinanten und folglich auch auf die Tellerreste. Insgesamt sprechen die differenzierten Ergebnisse zu den Interventionseffekten dafür, dass ganzheitlichere und tiefer gehende Analysen von Interventionen zur Reduktion von Essensresten und damit zu einem nachhaltigeren Lebensmittelkonsum in der Außer-Haus-Verpflegung beitragen können.
Standard extensive green roofs (EGRs) with their shallow substrate layers represent extreme sites for plant growth and therefore are planted mostly with drought-resistant species, including non-native plant species. As standard EGR substrates often lack potentially mutualistic soil microorganisms, it has been stated that inoculation with arbuscular mycorrhizal fungi (AMF) might increase plant performance and drought resistance. Aiming to support native biodiversity on EGRs, we tested whether AMF inoculation into standard green roof substrate can enhance plant performance and drought resistance of regionally occurring native dry grassland species.
The results of a pot experiment with 11 native plant species growing with and without AMF inoculation showed considerable differences in fitness-relevant plant traits. Over 88 days of moderate drought conditions, inoculated plants produced 2.5 times more above-ground biomass than control plants. In addition, the number of inflorescences on inoculated plants was significantly higher in 5 out of 7 flowering species. Under severe drought stress created by stopping the water supply, however, inoculated plants wilted on average 2.38 days earlier than control plants.
Although the underlying mechanisms of the observed results remain unresolved, AMF inoculation might help to enhance an earlier and higher seed set, facilitating the establishment of a soil seed bank, which is necessary for a self-sustaining plant population in drought-governed habitats such as EGRs.
German farmers are required by law to regularly self-assess the welfare of their animals. The project Q Check is aiming at developing a system that will assist farmers to objectively assess animal health and welfare in dairy cows. For this reason, a quarterly report will be compiled from animal-based key indicators to give an overview of the on-farm situation. The anonymised and aggregated reports can also be used for national animal welfare monitoring: Continuous collection of these key indicators enables the summary and publication of figures reflecting the current animal health and welfare status and progressions at federal state and at national level. Q Check is based on four data recording and analysis systems, which are already established in Germany and implemented on a national level. Out of these systems, the most suitable indicators to describe herd health have been selected by 215 experts within a twostage Delphi study. In addition, over 50 face-to-face interviews with stakeholders related to the German dairy sector have been performed in order to take into account the socio-scientific point of view. To complete the process, the selected indicators are currently being checked against mass data and hence tested for suitability regarding monitoring purposes. An automatic farm-specific evaluation of animal health, based on verified indicators, will provide support to farmers in fulfilling their legal requirements and in identifying weak points on the individual farms. A benchmarking system will be set up which will allow tracking the individual herd health indicators in the same farm in their course over time and compared with similar farms. These routinely provided horizontal and vertical statistics will facilitate targeted intervention and support objectified management decisions, implying that dairy farmers can benefit in several respects. In the course of the project, new tools for determining the risk of ketosis in the scope of milk recording will also be validated and implemented at national level to enhance monitoring of this major disease complex. The results of these nationwide, systematic investigations will contribute substantially to objectifying the discussion about the health and welfare situation of dairy cows.