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72 results for “crop pollination”
Landscape structure and farming management interacts to modulate pollination supply and crop production in blueberries
<p><span>Pollination services are affected by landscape context, farming management, and pollinator community structure, all of which impact flower visitation rates, pollen deposition and final production. We studied these processes in Argentina for Highbush Blueberry crops which depend on pollinators to produce marketable yields. </span></p> <p><span>We studied how land cover and honeybee stocking influence the abundance of wild and managed pollinators in blueberry crops, using structural equation modeling to disentangle the cascading effects through which pollinators contribute to blueberry fruit number, size, nutritional content and overall yield. </span></p> <p><span>All pollinator functional groups responded to landscape changes at a spatial scale under 1000 m, and the significance or direction of the effects were modulated by the field-level deployment of honeybee hives. </span></p> <p><span>Fruit diameter increased with pollen deposited, but decreased with honeybee abundance, which, had indirect effects on fruit acidity and sugar content. Honeybees had a positive effect on the number of fruit produced by the plants and also benefited the overall yield (kg plant</span><sup><span>-1</span></sup><span>) through independent effects on both the quality and quantity components of fruit production.</span></p> <p><span><em>Synthesis and applications:</em> </span></p> <p><span>Deployment of beehives in blueberry fields can buffer, but not compensate for the negative effects on honeybee abundance produced by surrounding large scale none-flowering crops. Such compensation would require high-quality beehives by monitoring their health and strength.</span> <span>The </span><span>contribution of honeybees to crop production is not equal across production metrics. That is, higher abundance of honeybees increases the number of berries produced, but at the cost of smaller and more acidic fruits, potentially reducing market value. Growers must consider this trade-off between fruit quantity and quality when actively managing honeybee abundance. </span></p>
Agricultural soil legacy influences multitrophic interactions between crops, their pathogens, and pollinators
<p>Soil legacy influences plant interactions with antagonists and below-ground mutualists. Plant-antagonist interactions can jeopardize, while soil mutualists can enhance, plant-pollinator interactions. This suggests that soil legacy, either directly or mediated through plant symbionts, affects pollinators. However, despite the importance of pollinators to natural and managed ecosystems, there is almost no information on how soil legacy affects plant-pollinator interactions. We assessed effects of soil management legacy (organic vs. conventional) on floral rewards and plant interactions with wild pollinators, herbivores, beneficial fungi, and pathogens. We used an observational dataset and structural equation models to evaluate hypothesized relationships between soil and pollinators, then tested observed correlations in a manipulative experiment. Organic legacy increased mycorrhizal fungal colonization and improved resistance to powdery mildew, which promoted pollinator visitation. Further, soil legacy and powdery mildew independently and interactively impacted plant traits important to pollinators, including floral traits and floral reward nutrients. Our results indicate that pollination could be an overlooked consequence of soil legacy and suggests opportunity to develop long-term soil management plans that benefit pollinators and pollination.</p>
Rare and declining bee species are key to consistent pollination of wildflowers and crops across large spatial scales
<p>Biodiversity promotes ecosystem function in experiments, but it remains uncertain how biodiversity loss affects function in larger-scale natural ecosystems, where rare and declining species which are likely to be lost and function needs to be maintained across space and time. Here we explore the importance of rare and declining bee species to the pollination of three wildflowers and three crops using large-scale (72 sites across 5,000 km2), multi-year datasets. Half (82/164) bee species were rare or declining, but these species provided ~15% of overall pollination. To determine the number of species important to ecosystem function, we used two methods of 'scaling up', both of which have previously been used for biodiversity-function analysis. First, we summed bee species' contributions to pollination across space and time and then found the minimum set of species needed to provide a threshold level of function across all sites; according to this method, effectively no rare and declining bee species were important to pollination. Second, we account for the "insurance value" of biodiversity by finding the minimum set of bee species needed to simultaneously provide a threshold level of function at each site in each year. The second method leads to the conclusion that 25 rare and eight declining bee species (36% and 53% of all rare and declining bee species, respectively) are important. Our findings provide some of the strongest evidence yet for the importance of rare and declining species, thereby providing a more direct link between real-world biodiversity loss and ecosystem function.</p>
Fig. 1 in Effects of irrigation method on pollination and pollinators (Hymenoptera: Apoidea) in an open-field tomato crop
Fig. 1. Fruit set (A) and weight of fruit (B) in relation to type of irrigation and type of pollination. OM = open + mechanical pollination.
Data and scripts for the analysis of the influence of crop pollinator dependence and growth form on yield decline
<p>Marcelo A. Aizen, Gabriela R. Gleiser, Thomas Kitzberger, Ruben Milla. <strong>Being a tree crop increases the odds of experiencing yield declines irrespective of pollinator dependence </strong>(to be submitted to PCI)</p> <p> </p> <p>Data and R scripts to reproduce the analyses and the figures shown in the paper. All analyses were performed using R 4.0.2.</p> <p> </p> <p><strong>Data</strong></p> <p>1. FAOdata_21-12-2021.csv</p> <p>This file includes yearly data (1961-2020, column 8) on yield and cultivated area (columns 6 and 10) at the country, sub-regional, and regional levels (column 2) for each crop (column 4) drawn from the United Nations Food and Agriculture Organization database (data available at <a href="http://www.fao.org/faostat/en">http://www.fao.org/faostat/en</a>; accessed July 21-12-2021). [Used in Script 1 to generate the synthesis dataset]</p> <p>2. countries.csv</p> <p>This file provides information on the region (column 2) to which each country (column 1) belongs. [Used in Script 1 to generate the synthesis dataset]</p> <p>3. dependence.csv</p> <p>This file provides information on the pollinator dependence category (column 2) of each crop (column 1).</p> <p>4. traits.csv</p> <p>This file provides information on the traits of each crop other than pollinator dependence, including, besides the crop name (column1), the variables type of harvested organ (column 5) and growth form (column 6). [Used in Script 1 to generate the synthesis dataset]</p> <p>5. dataset.csv</p> <p>The synthesis dataset generated by Script 1.</p> <p>6. growth.csv</p> <p>The yield growth dataset generated by Script 1 and used as input by Scripts 2 and 3.</p> <p>7. phylonames.csv</p> <p>This file lists all the crops (column 1) and their equivalent tip names in the crop phylogeny (column 2). [Used in Script 2 for the phylogenetically-controlled analyses]</p> <p>8.phylo137.tre</p> <p>File containing the phylogenetic tree.</p> <p> </p> <p><strong>Scripts</strong></p> <p>1. dataset</p> <p>This R script curates and merges all the individual datasets mentioned above into a single dataset, estimating and adding to this single dataset the growth rate for each crop and country, and the (log) cumulative harvested area per crop and country over the period 1961-2020.</p> <p>2. analyses</p> <p>This R script includes all the analyses described in the article’s main text.</p> <p>3. figures</p> <p>This R script creates all the main and supplementary figures of this article.</p> <p>4. lme4_phylo_setup</p> <p>R function written by Li and Bolker (2019) to carry out phylogenetically-controlled generalized linear mixed-effects models as described in the main text of the article.</p> <p> </p> <p><strong>References</strong></p> <p>Li, M., and B. Bolker. 2019. wzmli/phyloglmm: First release of phylogenetic comparative analysis in lme4- verse. Zenodo. https://doi.org/10.5281/zenodo.2639887.</p>
Smart orchard design improves crop pollination
<p>1. More sustainable and environmentally-friendly agricultural practices, including ecological intensification, are needed to reduce biodiversity loss and environmental degradation.</p> <p>2. We evaluated the potential of ecological intensification through the enhancement of pollination services in an intensively managed and insect-pollinated crop, <em>Macadamia</em> <em>integrifolia</em>. We compared the effects and importance of agronomic practices that include agronomic input (i.e. irrigation and managed honeybees), orchard design requiring no external inputs (i.e. spatial orchard structure) and landscape factors in ten South African macadamia orchards.</p> <p>3. In comparison to experimental pollinator exclusion, insect pollination increased the initial and final nut set by 304% and 23%, respectively. However, nut set was pollination limited as hand pollination further improved nut set.</p> <p>4. Flower visitation rates increased with the cover of semi-natural habitats in the surrounding landscape (1km radius). This effect was outperforming the effect of the number of managed honeybee colonies, as agronomic practice.</p> <p>5. Initial nut set increased with orchard design and flower visitation rates. Perpendicular orientation of the planted macadamia rows towards the semi-natural habitats increased initial nut set more than threefold compared to parallel row orientation. The initial nut set was 80% higher at the edge to semi-natural habitats than in the orchard centre. In contrast, agronomic practices, such as irrigation, did not increase initial nut set.</p> <p>6. Final nut set depended on the preconditions of the initial nut set, additionally, high altitudes and the position in the centre of the orchard had positive effects.</p> <p>7. Synthesis and applications. Pollination services were prerequisites for high yields in macadamia and could be improved without further agronomic input. Especially, the orchard design, i.e. spatial arrangement of tree rows and semi-natural habitats at local and landscape scales, was more important to boost insect pollination and the initial development of macadamia nuts than agronomic practices, such as high levels of irrigation. Considering the urgency to reduce the environmental impacts of agricultural production, we highlight the high potential of ecological intensification by a smart orchard design and the restoration and conservation of semi-natural habitats in the orchards and their surrounding landscape.</p>
Landscape structure and farming management interacts to modulate pollination supply and crop production in blueberries
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Smart orchard design improves crop pollination
Open the record for dataset details and reuse information.
Agricultural soil legacy influences multitrophic interactions between crops, their pathogens, and pollinators
Open the record for dataset details and reuse information.
Rare and declining bee species are key to consistent pollination of wildflowers and crops across large spatial scales
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Data from: Evaluating the taxa that provide shared pollination services across multiple crops and regions
Many pollinator species visit multiple crops in multiple regions, yet we know little about their pollination service provisioning at local and regional scales. We investigated the floral visitors (n = 13,200), their effectiveness (n = 1718 single visits) and response to landscape composition across three crops avocado, mango and macadamia within a single growing region (1 year), a single crop (3 years) and across different growing regions in multiple years. In total, eight wild visitor groups were shared across all three crops. The network was dominated by three pollinators, two bees (Apis mellifera and Tetragonula spp.) and a fly, Stomorhina discolour. The visitation network for the three crops was relatively generalised but with the addition of pollen deposition data, specialisation increased. Sixteen managed and wild taxa were consistently present across three years in avocado, yet their contribution to annual network structure varied. Node specialisation (d') analyses indicated many individual orchard sites across each of the networks were significantly more specialised compared to that predicted by null models, suggesting the presence of site-specific factors driving these patterns. Identifying the taxa shared across multiple crops, regions and years will facilitate the development of specific pollinator management strategies to optimize crop pollination services in horticultural systems.
Efficacy of cover crops for pollinator habitat provision and weed suppression
Pollinator declines have been documented globally, but little information is available about native bee ecology in Midwestern US agriculture. This project seeks to optimize pollinator support and weed suppression in a 3-year crop rotation with a fallow growing season. During fallow, one of five cover crop treatments (T1: crimson, red, and ladino clover and Bob oats [Trifolium incarnatum, T. pratense, T. repens, Avena sativa]; T2: crimson clover and oats; T3: red clover and oats; T4: ladino clover and oats; T5: no cover crop; T6/control: winter wheat [Triticum aestivum]) was seeded in one-half of 25 agricultural fields, while wheat was left unharvested in the other half as a comparison. Treatments that provide season-long floral resources support the greatest bee diversity and abundance (T1), and treatments with red clover support declining Bombus species (T1 and T3). Late-season floral resources may be important, yet limited (T1 and T4), and some species of agricultural weeds provide floral resources. Floral diversity may be less important than flower abundance or timing for pollinator diversity (T1 – T4). Weed diversity was greatest in the no cover crop treatment (T5), least in winter wheat (T6), and intermediate in cover crop treatments (T1 – T4) with no differences in weeds of economic concern. Wheat suppresses weeds but does not provide floral resources for pollinators. These results may also be applicable to marginal lands taken out of cultivation or field margin pollinator plantings in a typical corn-soybean rotation. Floral resource availability across the landscape is critical to maintain pollinator diversity.
Dual purpose: Predatory hoverflies pollinate strawberry crops and protect them against the strawberry aphid, Chaetospihon fragaefolii
<p>BACKGROUND: Predatory syrphids are an important functional group due to their potential for providing multiple ecosystem services. Adults feed on nectar and pollen and can be effective pollinators, while larvae are voracious predators that can reduce aphid pressure. Still, little research has addressed their potential dual function in agroecosystems. In this study, we assessed the potential of two predatory hoverflies, Eupeodes corollae and Sphaerophoria rueppellii, for delivering concurrent pollination and biological control of Chaetospihon fragaefolii in greenhouse strawberries.</p> <p>RESULTS: Both hoverfly species effectively pollinated strawberry flowers of two different varieties (‘Elsanta’ and ‘Sonsation’), resulting in an increase in high quality marketable fruits, a reduction of fruit deformities, and higher number of seeds per fruit compared to pollinator-excluded fruits. S. ruepellii had a significantly longer flower handling time than E. corollae, which translated to a more efficient pollination expressed as higher seed numbers per fruit after a single flower visit. By contrast, flowers that were open to multiple visits were more effectively pollinated by E. corollae, suggesting that E. corollae is potentially a better cross-pollinator than S. rueppellii. In addition, both hoverfly species suppressed aphid populations in strawberry (var. ‘Sonata’), with S. rueppellii and E. corollae reducing aphid populations by 49% and 62%, respectively.</p> <p>CONCLUSION: Predatory syrphids can concurrently contribute to pollination and biological control in strawberry in a greenhouse setting.</p> <p> </p>
Agroecological farming, flowering phenology and the pollinator-herbivore-parasitoid nexus regulate non-crop plant reproduction
<p>Agroecological farming uses crop and non-crop plant biodiversity to promote beneficial insects supplying pollination and biocontrol services to crops. Non-crop plants (sown or weeds) are integral to supporting these beneficial insect species interactions. How the uplift of biotic complexity by agroecological management (crop diversification, ecological infrastructure) influences mutualistic and antagonistic insect interactions regulating the reproduction of non-crop plants remains less understood. </p> <p>Using a pesticide-free farm-scale (125 ha) agroecological experiment, we tested how the individual reproduction of pollinator-dependent, non-crop plant species with different flowering phenology (<em>Cyanus segetum, Centaurea jacea</em>) and their mutualistic (pollinator) and antagonistic (seed herbivore–parasitoid) insect interactions were affected by agroecological practices. </p> <p>Seed set and species interactions of replicate <em>C. segetum</em> and <em>C. jacea</em> randomly introduced to field margins was correlated with floral resource heterogeneity at focal plant (e.g., flower display size), local community (floral richness/abundance driven by sown wildflower or grass margins), and local landscape (crop diversification, area of semi-natural habitat or mass flowering crops) scales. </p> <p>At the seasonal peak of non-crop floral diversity and abundance, antagonistic interactions weakly regulated <em>C. segetum</em> seed set with gains from pollinator activity predominating. Conversely, <em>C. jacea</em>, which flowered past the peak of non-crop floral diversity/abundance benefited from the promotion of seed herbivore parasitism and pollinator activity by the local landscape cover of semi-natural habitat and mass flowering crops.</p> <p>Synthesis and applications. Agroecological management produced spatial and-temporal gradients in crop and non-crop floral resources that interacted to modify pollinator or seed herbivore-parasitoid interactions and seed set of <em>Cyanus segetum</em> and <em>Centaurea jacea</em> plants. The degree of phenological overlap between <em>C. segetum</em> and <em>C. jacea</em> flowering and floral resources in the local community or landscape dictated the type and level of exposure to insect interactions influencing reproduction. Design of agroecological practices to deliver pollination and biocontrol services must consider how effects will vary with species traits and the ensemble of mutualistic (pollination) and antagonistic (herbivory, parasitism) interactions governing non-crop plant reproduction. Agroecological management supporting beneficial insect interactions may feedback to help restore functional non-crop plant populations and associated biodiversity, potentially reducing the frequency of management interventions (e.g., re-sowing wildflower strips). </p>
Flower strips and remnant semi-natural vegetation have different impacts on pollination and productivity of sunflower crops
<p>Intensification of agricultural landscapes to fulfil increased global food demands has dramatically impacted biodiversity and ecosystem services. Several pollinator groups, which are vital for the maintenance of pollinator-dependent crops, have been severely affected by this intensification process. Management tools, such as the implementation of agri-environmental schemes, have been widely proposed to improve pollinator's communities and pollination services, although the effectiveness of wildflower strips in comparison to existing natural or semi-natural habitats and the impact on yield has not been fully demonstrated.</p> <p><span>Here, we aimed to assess the effect of flower strips implementation near sunflower fields in two intensive agricultural regions and to quantify their impact on visitation rates and sunflower productivity. Data were obtained in two regions in Spain (Burgos and Cuenca) in sunflower fields with associated semi-natural vegetation (SNVs), with implemented wildflower strips (WFSs) and without vegetation structures (NonVs). Visitation rates were monitored over two years by direct observations, and both sunflower seed production and weight were assessed in 52 fields per year.</span></p> <p><span>Our results revealed regional and inter-annual variation in visitation rates, likely driven by structural differences in the landscapes studied. In Cuenca, characterized by more heterogeneous and floral resources-richer landscapes, the effects of WFSs were significant in the second year of implementation, with higher visitation rates and higher productivity values in fields with implemented wildflower strips compared to those without. In contrast, in Burgos, no consistent effects among field treatments across years were observed.</span></p> <p><span>Synthesis and applications. T</span><span>he implementation of flower strips or maintenance of remnant semi-natural habitats adjacent to sunflower fields, showed context-dependent effects on visitation rates and crop yield. In highly simplified agroecosystems, these interventions may be insufficient or may need longer times to produce significant effects. Yet, in regions where natural and semi-natural patches were already present, the implementation of flower strips was a successful strategy to promote pollinators and sunflower <a>productivity.</a></span></p>
Pollinators, pests and yield – multiple trade-offs from insecticide use in a mass-flowering crop
<p>Multiple trade-offs are likely to occur between pesticide use, pollinators and yield (via crop flowers) in pollinator-dependent, mass-flowering crops (MFCs), causing potential conflict between conservation and agronomic goals. To date, no studies have looked at both outcomes within the same system, meaning 'win-win solutions' for pollinators and yield can only be inferred.</p> <p>Here, we outline a new framework to explore these trade-offs, using red clover (<em>Trifolium pratense</em>) grown for seed production as an example. Specifically, we address how the insecticide thiacloprid affects densities of seed-eating weevils (<em>Protapion</em> spp.), pollination rates, yield, floral resources and colony dynamics of the key pollinator, <em>Bombus terrestris</em>.</p> <p>Thiacloprid did not affect the amount of nectar provided by, or pollinator visitation to, red clover flowers but did reduce weevil density, correlating to increased yield and gross profit. Colonies of <em>B. terrestris</em> significantly increased their weight and reproductive output in landscapes with (compared to without) red clover, regardless of insecticide use.</p> <p><em>Synthesis and Applications</em>: <span>We propose a holistic, conceptual framework to explore trade-offs between pollinators, pesticides and yield that we believe to be essential for achieving conservation and agronomic goals. This framework </span><span>applies to all insecticide-treated mass-flowering crops (MFCs) and can be adapted to include other ecological processes. Trialling the framework in our study system, we found that our focal insecticide, thiacloprid, improved red clover seed yield with no detected effects on its key pollinator <em>Bombus terrestris</em> and that the presence of red clover in the landscape can benefit pollinator populations.</span></p>
Disease management during bloom affects the floral microbiome but not pollination in a mass-flowering crop
<p>Flowering crops are heavily managed during bloom to both promote pollination and prevent disease. Disease management practices can alter the floral microbiome, including pathogens and non-target microbes. However, whether agrochemical presence or altered microbiome composition affect pollinator foraging and pollination services is unclear.</p> <p>We assessed the effects of orchard management tactics and landscape context on the flower microbiome in almond, <em>Prunus dulcis</em>. Fourteen orchards (5 conventional, 4 organic, 5 conventional with habitat augmentation) were sampled at early and peak bloom to characterize bacterial and fungal communities associated with floral tissues. The surveys were complemented by an artificial flower experiment to assess the effects of fungicides and microbes on honey bee foraging. Finally, a field trial was conducted to test the effects of fungicides and microbes on pollination. </p> <p>As bloom progressed, bacterial and fungal abundance and diversity increased across all floral tissue types and management strategies. The magnitude by which microbial abundance and diversity were affected varied, with proximity to apiaries and orchard management having notable effects on bacteria and fungi, respectively.</p> <p>Experiments revealed that fungicides reduced nectar removal by honey bees; however, neither fungicide nor microbe treatments affected pollination, as measured through pollen tube initiation and growth. </p> <p><strong>Synthesis and applications</strong>: Our results reveal that microbiota associated with flowers of a pollinator-dependent crop are temporally dynamic and sensitive to management practices. However, pollination services in almonds may be resilient to both agrochemical disturbance and microbial augmentation of flowers, the latter of which may become more prominent as microbial solutions to disease management are embraced in agroecosystems.</p>
Data and R code for: "Global meta-analysis shows reduced quality of food crops under inadequate animal pollination"
<p>R code, data, and metadata for the study "Global meta-analysis shows reduced quality of food crops under inadequate animal pollination"</p>
Agroecological farming, flowering phenology and the pollinator-herbivore-parasitoid nexus regulate non-crop plant reproduction
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Data from: Ensuring pollinator presence in expanding oil crops: The case of Mystrops debilis (Nitidulidae) and the macauba palm (Acrocomia aculeata, Arecaceae)
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