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Semi-natural habitats (SNHs) are becoming increasingly scarce in modern agricultural landscapes. This may reduce natural ecosystem services such as pest control with its putatively positive effect on crop production. In agreement with other studies, we recently reported wheat yield reductions at field borders which were linked to the type of SNH and the distance to the border. In this experimental landscape-wide study, we asked whether these yield losses have a biotic origin while analyzing fungal seed and fungal leaf pathogens, herbivory of cereal leaf beetles, and weed cover as hypothesized mediators between SNHs and yield. We established experimental winter wheat plots of a single variety within conventionally managed wheat fields at fixed distances either to a hedgerow or to an in-field kettle hole. For each plot, we recorded the fungal infection rate on seeds, fungal infection and herbivory rates on leaves, and weed cover. Using several generalized linear mixed-effects models as well as a structural equation model, we tested the effects of SNHs at a field scale (SNH type and distance to SNH) and at a landscape scale (percentage and diversity of SNHs within a 1000-m radius). In the dry year of 2016, we detected one putative biotic culprit: Weed cover was negatively associated with yield values at a 1-m and 5-m distance from the field border with a SNH. None of the fungal and insect pests, however, significantly affected yield, neither solely nor depending on type of or distance to a SNH. However, the pest groups themselves responded differently to SNH at the field scale and at the landscape scale. Our findings highlight that crop losses at field borders may be caused by biotic culprits; however, their negative impact seems weak and is putatively reduced by conventional farming practices.
When he founded Schocken Books in 1945, department store magnate, philanthropist, and publisher Salman Schocken (1877–1959) called his new American publishing business an imitation of its German predecessor, which had functioned from 1931 until 1938. He intended it to replicate the success of the Berlin Schocken Verlag by spiritually fortifying a Jewish community uncertain in its identity. The new company reflected the transnational transfer of people, ideas, and texts between Germany, Palestine/Israel, and the United States. Its success and near-failure raise questions about transnationalism and American Jewish culture: Can a culture be imposed on a population which has its own organs and agencies of cultural production? Had American Jewish culture developed organically to the specific place where several million Jews found themselves and according to uniquely American cultural patterns? The answers suggest that the concepts of transnationalism and cultural transfer complement each other as tools to analyze American Jewry in its American and Jewish contexts.
Foreign Entanglements
(2021)