Refine
Has Fulltext
- yes (55)
Is part of the Bibliography
- yes (55)
Year of publication
Document Type
- Journal article (54)
- Report (1)
Language
- English (55) (remove)
Keywords
- biodiversity (8)
- pollen (6)
- bees (4)
- foraging (4)
- honey bees (4)
- Apis mellifera (3)
- ecosystem services (3)
- land use (3)
- larvae (3)
- oilseed rape (3)
- pollination (3)
- species richness (3)
- spillover (3)
- winter wheat (3)
- Ecology (2)
- NDVI (2)
- Sentinel-2 (2)
- abundance (2)
- agriculture (2)
- agroecosystems (2)
- altitudinal gradient (2)
- canola (2)
- climate (2)
- climate change (2)
- diversity (2)
- diversity gradients (2)
- ecosystem function (2)
- flowers (2)
- fruit set (2)
- fusion (2)
- global change (2)
- honeybee (2)
- juvenile hormone (2)
- land-use change (2)
- nutrition (2)
- species diversity (2)
- sustainable agriculture (2)
- trap nests (2)
- triglycerides (2)
- 16S ribosomal-RNA (1)
- 4TH-Corner Problem (1)
- African agriculture (1)
- Agricultural intensification (1)
- Agro-ecology (1)
- Alps (1)
- Anthropocene (1)
- BBCH (1)
- BETA-Diversität (1)
- BETA-Multifunktionalität (1)
- Bacillus (1)
- Bee abundance (1)
- Biodiversity (1)
- Biodiversität (1)
- Bottom-up (1)
- Chrysomelidae (1)
- Climate Change (1)
- Colony growth (1)
- Community ecology (1)
- Conservation (1)
- Context (1)
- Curculionidae (1)
- DNA barcoding (1)
- Densities (1)
- Drought (1)
- Ecological Networks (1)
- Ecological networks (1)
- Ecosystem ecology (1)
- Ecosystem services (1)
- Environmental impact (1)
- European orchard bee (Osmia cornuta) (1)
- Foragers (1)
- Forschungsstation Fabrikschleichach (1)
- Grasses (1)
- Habitats (1)
- Herbivory (1)
- ITS2 (1)
- Insect pests (1)
- Insects (1)
- Landsat (1)
- Landsat 8 (1)
- Landscape ecology (1)
- Landwirtschaft (1)
- Leaves (1)
- Legume crops (1)
- Legumes (1)
- LiDAR (1)
- Locomotor activity (1)
- MOD13Q1 (1)
- MODIS (1)
- Multiple Traits (1)
- NGS (1)
- Nesting resources (1)
- Nurses (1)
- Oilseed rape (1)
- Osmia bicornis (1)
- PER (1)
- Paenibacillus (1)
- Plant-herbivore interactions (1)
- Plant-insect interactions (1)
- Pollen (1)
- Pollination (1)
- Polymerase chain reaction (1)
- Richness (1)
- Scarabaeidae (1)
- Small-holder agriculture (1)
- Social entrainment (1)
- South Korea (1)
- Species Traits (1)
- Sporosarcina (1)
- T-RFLP analysis (1)
- Tanzania (1)
- Temperature rhythms (1)
- Traits-Environment Relationships (1)
- Tropical agriculture (1)
- Vicia faba (L.) (1)
- Volatile Organic Compound (VOC) (1)
- Waldökosystem (1)
- Yield (1)
- abiotic (1)
- advanced (1)
- agri-environment schemes (1)
- agricultural intensification (1)
- agricultural landscapes (1)
- agroecology (1)
- agroforestry (1)
- altitudinal gradients (1)
- antagonists (1)
- arthropod predators (1)
- arthropods (1)
- artificial rearing (1)
- bacillus thuringiensis (1)
- bacteria (1)
- bacterial pathogens (1)
- bacterial transmission (1)
- balance (1)
- bats (1)
- bee community (1)
- bee pollinator (1)
- bee pollinators (1)
- beech forests (1)
- behavior (1)
- beta diversity (1)
- beta-multifunctionality (1)
- biodiversity conservation (1)
- biodiversity-ecosystem functioning (1)
- biofuels (1)
- biological control (1)
- biotic interaction (1)
- bird diversity (1)
- birds (1)
- body-size (1)
- bottom‐up and top‐down control (1)
- brain development (1)
- butterflies (1)
- cabbage Brassica oleracea var. capitata (1)
- carbon dioxide (CO2) (1)
- cocoa (1)
- coexistence (1)
- cognition (1)
- coleoptera (1)
- colonies (1)
- communities (1)
- community ecology (1)
- community functional-responses (1)
- competition (1)
- confocal laser scanning microscopy (1)
- conversion (1)
- coprophagous beetles (1)
- corn pollen (1)
- crop diversity (1)
- crop modeling (1)
- crop models (1)
- crop pollination (1)
- crops (1)
- decay (1)
- decision making (1)
- decision-making (1)
- decline (1)
- declines (1)
- decomposition (1)
- delayed snowmelt (1)
- density (1)
- diet (1)
- differential olfactory conditioning (1)
- distribution (1)
- disturbance gradient (1)
- ecological network (1)
- ecology (1)
- economy services (1)
- ecosystemservices (1)
- elevation (1)
- elevation gradient (1)
- elevational gradients (1)
- enercy-richness hypothesis (1)
- enhance (1)
- environmental impact (1)
- european countries (1)
- extinction dynamics (1)
- feeding guilds (1)
- field boundaries (1)
- floral resource distribution (1)
- flower visitors (1)
- flowering (1)
- flowering plants (1)
- food resources (1)
- foragers (1)
- foraging behaviour (1)
- forest (1)
- forest management (1)
- forest proximity (1)
- forest soils (1)
- fruit-quality (1)
- functional diversity (1)
- functional traits (1)
- generalization (1)
- genetically modified crops (1)
- genetically modified plants (1)
- geographic biases (1)
- global dataset (1)
- grassland (1)
- grasslands (1)
- grazing (1)
- gut bacteria (1)
- habitat types (1)
- habitats (1)
- hand pollination (1)
- herbivores (1)
- herbivorous beetles (1)
- herbivory (1)
- heterogenity (1)
- high throughput sequencing (1)
- hill numbers (1)
- honey (1)
- honeybees (1)
- illumina MiSeq platform (1)
- in vitro (1)
- insect abundance (1)
- insect pests (1)
- insect populations (1)
- intensification (1)
- land use intensification (1)
- land-use (1)
- land-use intensification (1)
- land-use intensity (1)
- landsat (1)
- landscape compositionv (1)
- landscape diversity (1)
- landscape ecology (1)
- landscape heterogeneity (1)
- life-history traits (1)
- machine learning (1)
- macroecology (1)
- maize (1)
- managed grasslands (1)
- mechanistic modelling (1)
- metaanalysis (1)
- microbiome (1)
- more-individuals hypothesis (1)
- morphometry (1)
- multivariate analyses (1)
- mushroom bodies (1)
- mutualistic interactions (1)
- native bees (1)
- native pollinators (1)
- native populations (1)
- necrobiome (1)
- nest site selection (1)
- network analysis (1)
- network specialization index (H2′) (1)
- neuroanatomy (1)
- next generation sequencing (1)
- niche (1)
- non-crop habitats (1)
- nurse bees (1)
- nursing (1)
- oil seed rape (1)
- oil-seed rape (1)
- orientation (1)
- osmia (1)
- ozone (O3) (1)
- palynolog (1)
- partial least square regression (1)
- pathogen (1)
- patterns (1)
- pest (1)
- phytophagous beetles (1)
- plant diversity (1)
- plant ecology (1)
- plant functional traits (1)
- plant guilds (1)
- plant physiology (1)
- plant-herbivore interactions (1)
- plant-insect interactions (1)
- plant–insect interactions (1)
- pollen provisions (1)
- pollination ecology (1)
- pollination services (1)
- pollinator (1)
- pollinator decline (1)
- pollinator diversity (1)
- precision agriculture (1)
- predictive modeling (1)
- proboscis extension reflex (1)
- productivity (1)
- proportion of seminatural habitat (1)
- protected forests (1)
- random forest (1)
- recruitment (1)
- resolution (1)
- resource selection (1)
- risk assessment (1)
- robustness (1)
- root (1)
- satellite (1)
- season (1)
- secondary invader (1)
- semi-natural habitats (1)
- sentinel-2 (1)
- sequential introduction (1)
- sequestration (1)
- shade cover (1)
- snowmelt (1)
- solitary bee (1)
- specialization (1)
- species‐area hypothesis (1)
- stocks (1)
- sustainable intensification (1)
- swarming (1)
- task allocation (1)
- taxonomic biases (1)
- temperature‐mediated resource exploitation hypothesis (1)
- temperature‐richness hypothesis (1)
- time lag (1)
- transient dynamics (1)
- tree cavities (1)
- trophic interactions (1)
- trophic levels (1)
- tropical ecology (1)
- undernourishment (1)
- unmanaged broadleaved forests (1)
- urban (1)
- urbanization (1)
- wasps (1)
- water (1)
- wild (1)
- wild bees (1)
- wild honeybees (1)
- wild plant pollination (1)
- worker honeybees (1)
Institute
- Theodor-Boveri-Institut für Biowissenschaften (55) (remove)
Sonstige beteiligte Institutionen
- Albert-Ludwigs-Universität Freiburg (1)
- DNA Analytics Core Facility, Biocenter, University of Wuerzburg, Wuerzburg, Germany (1)
- Goethe-Universität Frankfurt (1)
- Leuphana Universität Lüneburg (1)
- Technische Universität Dresden (1)
- Technische Universität München (1)
- Universität Bayreuth (1)
- Universität Göttingen (1)
- Universität Leipzig (1)
- iDiv (1)
ResearcherID
- D-1221-2009 (1)
1. Pollination services of cacao are crucial for global chocolate production, yet remain critically understudied, particularly in regions of origin of the species. Notably, uncertainties remain concerning the identity of cacao pollinators, the influence of landscape (forest distance) and management (shade cover) on flower visitation and the role of pollen deposition in limiting fruit set.
2. Here, we aimed to improve understanding of cacao pollination by studying limiting factors of fruit set in Peru, part of the centre of origin of cacao. Flower visitors were sampled with sticky insect glue in 20 cacao agroforests in two biogeographically distinct regions of Peru, across gradients of shade cover and forest distance. Further, we assessed pollen quantities and compared fruit set between naturally and manually pollinated flowers.
3. The most abundant flower visitors were aphids, ants and thrips in the north and thrips, midges and parasitoid wasps in the south of Peru. We present some evidence of increasing visitation rates from medium to high shade (40%–95% canopy closure) in the dry north, and opposite patterns in the semi-humid south, during the wet season.
4. Natural pollination resulted in remarkably low fruit set rates (2%), and very low pollen deposition. After hand pollination, fruit set more than tripled (7%), but was still low.
5. The diversity and high relative abundances of herbivore flower visitors limit our ability to draw conclusions on the functional role of different flower visitors. The remarkably low fruit set of naturally and even hand pollinated flowers indicates that other unaddressed factors limit cacao fruit production. Such factors could be, amongst others, a lack of effective pollinators, genetic incompatibility or resource limitation. Revealing efficient pollinator species and other causes of low fruit set rates is therefore key to establish location-specific management strategies and develop high yielding native cacao agroforestry systems in regions of origin of cacao
The recently observed consistent loss of β-diversity across ecosystems indicates increasingly homogeneous communities in patches of landscapes, mainly caused by increasing land-use intensity. Biodiversity is related to numerous ecosystem functions and stability. Therefore, decreasing β-diversity is also expected to reduce multifunctionality. To assess the impact of homogenization and to develop guidelines to reverse its potentially negative effects, we combine expertise from forest science, ecology, remote sensing, chemical ecology and statistics in a collaborative and experimental β-diversity approach. Specifically, we will address the question whether the Enhancement of Structural Beta Complexity (ESBC) in forests by silviculture or natural disturbances will increase biodiversity and multifunctionality in formerly homogeneously structured production forests. Our approach will identify potential mechanisms behind observed homogenization-diversity-relationships and show how these translate into effects on multifunctionality. At eleven forest sites throughout Germany, we selected two districts as two types of small ‘forest landscapes’. In one of these two districts, we established ESBC treatments (nine differently treated 50x50 m patches with a focus on canopy cover and deadwood features). In the second, the control district, we will establish nine patches without ESBC. By a comprehensive sampling, we will monitor 18 taxonomic groups and measure 21 ecosystem functions, including key functions in temperate forests, on all patches. The statistical framework will allow a comprehensive biodiversity assessment by quantifying the different aspects of multitrophic biodiversity (taxonomical, functional and phylogenetic diversity) on different levels of biodiversity (α-, β-, γ-diversity). To combine overall diversity, we will apply the concept of multidiversity across the 18 taxa. We will use and develop new approaches for quantification and partitioning of multifunctionality at α- and β- scales. Overall, our study will herald a new research avenue, namely by experimentally describing the link between β-diversity and multifunctionality. Furthermore, we will help to develop guidelines for improved silvicultural concepts and concepts for management of natural disturbances in temperate forests reversing past homogenization effects.
Agricultural Policies Exacerbate Honeybee Pollination Service Supply-Demand Mismatches Across Europe
(2014)
Declines in insect pollinators across Europe have raised concerns about the supply of pollination services to agriculture. Simultaneously, EU agricultural and biofuel policies have encouraged substantial growth in the cultivated area of insect pollinated crops across the continent. Using data from 41 European countries, this study demonstrates that the recommended number of honeybees required to provide crop pollination across Europe has risen 4.9 times as fast as honeybee stocks between 2005 and 2010. Consequently, honeybee stocks were insufficient to supply >90% of demands in 22 countries studied. These findings raise concerns about the capacity of many countries to cope with major losses of wild pollinators and highlight numerous critical gaps in current understanding of pollination service supplies and demands, pointing to a pressing need for further research into this issue.
Background
Bees (Hymenoptera: Apoidea: Anthophila) are the most important group of pollinators with about 20,507 known species worldwide. Despite the critical role of bees in providing pollination services, studies aiming at understanding which species are present across disturbance gradients are scarce. Limited taxononomic information for the existing and unidentified bee species in Tanzania make their conservation haphazard. Here, we present a dataset of bee species records obtained from a survey in nothern Tanzania i.e. Kilimanjaro, Arusha and Manyara regions. Our findings serve as baseline data necessary for understanding the diversity and distribution of bees in the northern parts of the country, which is a critical step in devising robust conservation and monitoring strategies for their populations.
New information
In this paper, we present information on 45 bee species belonging to 20 genera and four families sampled using a combination of sweep-netting and pan trap methods. Most species (27, ~ 60%) belong to the family Halictidae followed by 16 species (35.5%) from the family Apidae. Megachilidae and Andrenidae were the least represented, each with only one species (2.2%). Additional species of Apidae and Megachilidae sampled during this survey are not yet published on Global Biodiversity Information Facility (GBIF), once they will be available on GBIF, they will be published in a subsequent paper. From a total of 953 occurrences, highest numbers were recorded in Kilimanjaro Region (n = 511), followed by Arusha (n = 410) and Manyara (n = 32), but this pattern reflects the sampling efforts of the research project rather than real bias in the distributions of bee species in northern Tanzania.
Chronobiological studies of individual activity rhythms in social insects can be constrained by the artificial isolation of individuals from their social context. We present a new experimental set-up that simultaneously measures the temperature rhythm in a queen-less but brood raising mini colony and the walking activity rhythms of singly kept honey bees that have indirect social contact with it. Our approach enables monitoring of individual bees in the social context of a mini colony under controlled laboratory conditions. In a pilot experiment, we show that social contact with the mini colony improves the survival of monitored young individuals and affects locomotor activity patterns of young and old bees. When exposed to conflicting Zeitgebers consisting of a light-dark (LD) cycle that is phase-delayed with respect to the mini colony rhythm, rhythms of young and old bees are socially synchronized with the mini colony rhythm, whereas isolated bees synchronize to the LD cycle. We conclude that the social environment is a stronger Zeitgeber than the LD cycle and that our new experimental set-up is well suited for studying the mechanisms of social entrainment in honey bees.