Alexandra‐Maria Klein
A5070924304- Plant and animal studies
- Ecology and Vegetation Dynamics Studies
- Insect and Pesticide Research
- Insect and Arachnid Ecology and Behavior
- Plant Parasitism and Resistance
- Insect-Plant Interactions and Control
- Species Distribution and Climate Change
- Conservation, Biodiversity, and Resource Management
- Forest Management and Policy
- Land Use and Ecosystem Services
- Forest Ecology and Biodiversity Studies
- Forest Insect Ecology and Management
- Botany and Plant Ecology Studies
- Animal and Plant Science Education
- Animal Ecology and Behavior Studies
- Bee Products Chemical Analysis
- Wildlife Ecology and Conservation
- Cocoa and Sweet Potato Agronomy
- Agricultural Innovations and Practices
- Plant Reproductive Biology
- Economic and Environmental Valuation
- Bat Biology and Ecology Studies
- Flowering Plant Growth and Cultivation
- Bioenergy crop production and management
- Horticultural and Viticultural Research
University of Freiburg
2016-2025
University of Amsterdam
2025
Lund University
2024
Agroscope
2023
Forest Research Institute Malaysia
2023
University of Guelph
2023
United States Department of Agriculture
2023
Agricultural Research Service
2023
China Agricultural University
2023
University of Education Freiburg
2023
Abstract Understanding the negative and positive effects of agricultural land use for conservation biodiversity, its relation to ecosystem services, needs a landscape perspective. Agriculture can contribute high‐diversity systems, which may provide important services such as pollination biological control via complementarity sampling effects. Land‐use management is often focused on few species local processes, but in dynamic, landscapes, only diversity insurance guarantee resilience (the...
The diversity and abundance of wild insect pollinators have declined in many agricultural landscapes. Whether such declines reduce crop yields, or are mitigated by managed as honey bees, is unclear. We found universally positive associations fruit set with flower visitation insects 41 systems worldwide. In contrast, increased significantly bees only 14% the surveyed. Overall, pollinated crops more effectively; an increase enhanced twice much equivalent bee visitation. Visitation promoted...
Sustainable agricultural landscapes by definition provide high magnitude and stability of ecosystem services, biodiversity, crop productivity.However, few studies have considered landscape effects on the services.We tested whether isolation from florally diverse natural semi-natural areas reduces spatial temporal flower-visitor richness pollination services in fields.We synthesized data 29 with contrasting biomes, species, pollinator communities.Stability richness, visitation rate (all...
Abstract There is compelling evidence that more diverse ecosystems deliver greater benefits to people, and these ecosystem services have become a key argument for biodiversity conservation. However, it unclear how much needed in cost-effective way. Here we show that, while the contribution of wild bees crop production significant, service delivery restricted limited subset all known bee species. Across crops, years biogeographical regions, crop-visiting communities are dominated by small...
The worldwide decline of pollinators may negatively affect the fruit set wild and cultivated plants. Here, we show that self-fertilizing highland coffee (Coffea arabica) is highly variable related to bee pollination. In a comparison 24 agroforestry systems in Indonesia, could be predicted by number flower-visiting species, it ranged from ca. 60% (three species) 90% (20 species). Diversity, not abundance, explained variation set, so collective role species-rich community was important for...
Significance Many of the world’s crops are pollinated by insects, and bees often assumed to be most important pollinators. To our knowledge, study is first quantitative evaluation relative contribution non-bee pollinators global pollinator-dependent crops. Across 39 studies we show that insects other than efficient providing 39% visits crop flowers. A shift in perspective from a bee-only focus needed for assessments pollinator biodiversity economic value pollination. These should also...
Human land use threatens global biodiversity and compromises multiple ecosystem functions critical to food production. Whether crop yield-related services can be maintained by a few dominant species or rely on high richness remains unclear. Using database from 89 studies (with 1475 locations), we partition the relative importance of richness, abundance, dominance for pollination; biological pest control; final yields in context ongoing land-use change. Pollinator enemy directly supported...
Background and AimsProductivity of many crops benefits from the presence pollinating insects, so a decline in pollinator abundance should compromise global agricultural production. Motivated by lack accurate estimates size this threat, we quantified effect total loss pollinators on production crop diversity. The change dependency over 46 years was also evaluated, considering developed developing world separately.
Tree diversity improves forest productivity Experimental studies in grasslands have shown that the loss of species has negative consequences for ecosystem functioning. Is same true forests? Huang et al. report first results from a large biodiversity experiment subtropical China. The study combines many replicates, realistic tree densities, and plot sizes with wide range richness levels. After 8 years experiment, findings suggest strong positive effects on carbon accumulation. Thus, changing...
Biodiversity loss can affect the viability of ecosystems by decreasing ability communities to respond environmental change and disturbances. Agricultural intensification is a major driver biodiversity has multiple components operating at different spatial scales: from in-field management intensity landscape-scale simplification. Here we show that landscape-level effects dominate functional community composition even buffer on homogenization, animal in real-world managed landscapes unified...
Pollinators play a key role in the reproduction of most plant species, and pollinator diversity are often related. We studied an experimental gradient species richness for better understanding plant–pollinator community interactions their temporal variability, because non‐experimental field surveys is confounded with gradients management, soil fertility, composition. observed frequency visits six times 73 plots over two years, used advanced statistical analysis to account high number zeroes...
Human welfare depends on the amount and stability of agricultural production, as determined by crop yield cultivated area. Yield increases asymptotically with resources provided farmers’ inputs environmentally sensitive ecosystem services. Declining growth increased prompts conversion more land to cultivation, but at risk eroding To explore interdependence production its services, we present test a general graphical model, based Jensen's inequality, yield–resource relations consider...
In diverse pollinator communities, interspecific interactions may modify the behaviour and increase pollination effectiveness of individual species. Because agricultural production reliant on is growing, improving could crop yield without any in intensity or area. California almond, a highly dependent honey bee pollination, we explored foraging bees orchards with simple (honey only) (non-Apis present) communities. non-Apis bees, changed single visit was greater than where were absent. This...