Newest publications
Conquering knowledge exchange barriers with age differences: a stress appraisal perspective on the consequences of upward social comparisons
(2025) Rinker, Laura; Fasbender, Ulrike; Gerpott, Fabiola H.; Burmeister, Anne
Knowledge exchange is crucial for organizations, but interpersonal dynamics can entail stress, affecting whether and how knowledge flows. Integrating social comparison and stress appraisal research, we propose that upward social comparison can be appraised as challenging or hindering. We suggest a dual pathway model involving an approach pathway via challenge appraisal and an avoidance pathway via hindrance appraisal with consequences on three knowledge exchange behaviours (i.e., knowledge sharing, knowledge seeking and knowledge hiding). Additionally, we examine age differences (vs. no age differences) to the comparison target as a buffer. We conducted two preregistered experimental online studies with employees (NStudy 1 = 206, NStudy 2 = 414), utilizing a 2 (social comparison; upward, lateral) × 3 (target age; younger, same‐age, older) between‐subject design. Participants received bogus task performance feedback (Study 1: cognitive ability test; Study 2: typing ability test). Both studies show that upward social comparison (but not other social comparison directions) fosters knowledge hiding via hindrance appraisal. This effect is weakened by an age difference (vs. no age difference) to the comparison target. However, our results do not support the approach pathway via challenge appraisal. Our research highlights social pitfalls in knowledge exchange and emphasizes the benefits of age differences between colleagues.
Rainforest transformation reduces parasitoid wasp diversity—Can the enrichment of flowering vegetation alleviate this?
(2024) Azhar, Azru; Grass, Ingo; Rizali, Akhmad; Pudjianto,; Buchori, Damayanti
In Indonesia, the rapid expansion of oil palm and rubber plantations replaces large areas of tropical rainforest. Rainforest transformation alters the diversity and composition of parasitoid wasp communities, but appropriate management strategies to buffer their decline in rainforest transformation landscapes are not yet developed. Here, we studied the effects of rainforest conversion to smallholder rubber and oil palm plantations on parasitoid wasp species richness, abundance and species composition. We also conducted a flowering vegetation enrichment experiment using the flowering weed Asystasia gangetica in all land‐uses to investigate potential mitigation effects on parasitoid wasp diversity and composition. Rainforest transformation to rubber plantations caused a large decrease in species richness (46%) and abundance (59%) of parasitoid wasps. Community structure of parasitoid wasps differed between forest and monoculture habitats with more habitat‐specialised species in forest and a higher proportion of common species in the monoculture. The experimental flowering vegetation enrichment increased parasitoid wasp species richness by 18% and abundance by 127%. Enrichment also enhanced the presence of unique parasitoid species in plantation and furthermore increased differences in community composition between rainforest and plantations. However, the enrichment experiment was confounded by time, meaning that a multi‐year experiment with targeted controls is necessary for statistically more reliable statements. Our study shows the effect of rainforest transformation to oil palm and rubber plantations on parasitoid wasp communities. Although providing additional flowering vegetation in plantations seems to potentially mitigate diversity loss, further research is needed to confirm and to investigate the mechanisms how flowering plants alleviate negative effects of rainforest transformation on parasitoid communities. Thereby, efficient conservation strategies for parasitoids wasps and their biological control services can be developed for rapidly changing tropical landscapes.
The commitment of farmers to traditional and hybrid cooperatives: empirical evidence over a six‐year period
(2024) Hansen, Rebecca; Hess, Sebastian; Nilsson, Jerker; Ollila, Petri
This study investigates the commitment of farmer members to traditional and hybrid cooperatives, and examines how and why their commitment has changed over time. The empirical basis consists of three surveys of representative samples of Finnish farmers conducted in 2010, 2013 and 2016. Dairy cooperatives in Finland have a traditional organizational form. Animal breeders deliver to hybrid cooperatives that have some external investors, but farmers have the majority of the votes. In both industries, the farmers are committed to their cooperatives and increasingly so over the years. This is particularly true of dairy farmers. However, the members’ commitment is based more on their satisfaction with the cooperatives’ business activities rather than on any cohesion within the cooperative societies. One explanation for this is that primary agriculture is becoming more consolidated, with fewer but larger farms whose owners are business oriented and professional.
Levelling the field: a review of the ICT revolution and agricultural extension in the Global South
(2025) Khan, Rashid Parvez; Gupta, Saurabh; Daum, Thomas; Birner, Regina; Ringler, Claudia
Information and communications technology has evolved significantly over the last seven decades, beginning with radio and video vans and culminating in the rise of smartphones and mobile internet in remote areas of the Global South. While ICT is an integral part of agricultural extension, little is known about how these changes have influenced agricultural extension practices. After a systematic review of 131 papers, we find that changes in ICT have shaped agricultural extension, enabling a shift from linear dissemination and “one‐way communication” to co‐innovation and farmer‐to‐farmer learning. The results indicate the potential for smartphones and mobile internet to democratize agricultural extension.
Sustainable innovations, knowledge and the role of proximity: a systematic literature review
(2025) Wilke, Ulrich; Pyka, Andreas
Innovations can substantially contribute to the transformation toward sustainability if they induce a positive social and/or environmental impact. Such sustainable innovations differ considerably from conventional, purely economic innovations. The main difference stems from the different knowledge bases necessary for the development of these innovations. These knowledge bases are widely dispersed across different actors from business, academia, government, and civil society. Following the innovation system approach, we look at actor constellations, linkages between actors, and knowledge flows within networks that generate sustainable innovations. For this purpose, we conduct a systematic literature review, focusing on the concept of proximity and its five dimensions (geographical, cognitive, institutional, organizational, and social proximity). The results show that all proximity dimensions, as well as the interdependencies between them, are relevant for analyzing knowledge flows leading to sustainable innovations. The interplay of the different proximity dimensions can be described via two mechanisms, one being reinforcement and the other one being either substitution or overlap. We conclude that for the occurrence of radical, systemic innovations, which have the potential of altering the prevailing socio‐economic paradigm toward greater sustainability, a combination of low cognitive and low (micro‐) institutional proximity combined with high organizational, social, or geographical proximity, appears particularly conducive.