Landscape composition mediates suppression of major pests by natural enemies in conventional cruciferous vegetables

Jie, Zhang; You, Shijun; Niu, Dongsheng; Guaman, Karla Giovana Gavilanez; Wang, Ao; Saqib, H. S. A.; He, Weiyi; Yu, Yuan; Guang, Yang; Pozsgai, Gábor; You, Minsheng

doi:10.1016/j.agee.2021.107455

Cited by 13 publications

(13 citation statements)

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“…In our study, we showed that all the landscape variables significantly linked to the variations observed in assemblages of gut microbiota in spiders; particularly varying proportions landscape composition diversity (SHDI), forest patches, grassland patches and edge density were the factors which showed significant influences. In several studies it has been reported that varying proportions of different land uses and edge density (Gallé et al, 2018;Landis et al, 2000;Perović et al, 2015) as well as the landscape compositional diversity (Zhang et al, 2021) in the surrounding landscape may alter the assemblage patterns of farmland biodiversity, which may likely also have significant impact on driving the distribution of microbes at various trophic levels within an ecosystem. In a characterization study of several insect species and their associated gut microbiota, the relative occurrences of microbes were found to vary according to the surrounding environmental habitats of the insects (Yun et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Gut microbiota assemblages of generalist predators are driven by local- and landscape-scale factors

Saqib

Sun

Pozsgai

et al. 2022

Preprint

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The gut microbiomes of arthropods are reported to have significant impact on key physiological functions such as nutrition, reproduction, behavior, and health. Spiders are diverse and numerically dominant predators in crop fields where they are potentially important regulators of pests. The taxonomic structure of spider gut microbiomes, and environmental drivers of composition are unknown. Harnessing spiders to support agricultural productivity is likely to be supported by an understanding of the gut microbiomes of these predators. This study aimed to deciphering the gut microbiome assembly of predators as well as elucidating the potential implications of key environmental constraints in this process. Here, we used high-throughput sequencing to examine for the first time how the assemblages of bacteria in the gut of spiders are shaped by diverse environmental variables. A total of 27 bacterial phyla were detected with Proteobacteria and Firmicutes dominant. The core bacterial communities included the families Enterobacteriaceae, Chloroplast, Lactobacillaceae, Pseudomonadaceae, Lachnospiraceae, Leuconostocaceae and Ruminococcaceae. Local drivers of microbiome composition were the globally-relevant input use system (organic production versus conventional practice), and crop identity (Chinese cabbage versus cauliflower). Landscape-scale factors, proportion of forest and grassland, compositional diversity, and habitat edge density, also strongly affected gut microbiota. Specific bacterial taxa were enriched in the gut of spiders sampled from different settings and seasons. These findings provide a comprehensive insight into the composition and plasticity of spider gut microbiota. Understanding the temporal responses of specific microbiota could lead to innovative strategies development for boosting biological control services of predators.

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Section: Discussionmentioning

confidence: 99%

Gut microbiota assemblages of generalist predators are driven by local- and landscape-scale factors

Saqib

Sun

Pozsgai

et al. 2022

Preprint

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“…To investigate the land use distribution in each field, aerial photos were taken by a drone (PHANTOM 4,Shenzhen Dajiang Baiwang Technology Co.,Ltd.,China), then data were validated 1b). The proportion of different land use types was calculated for five different spatial scales, 100, 200, 300, 400, and 500 meter radius around the focal field, by using QGIS 3.4 (for details, see Zhang et al (2021)).…”

Section: Study Area and Land Use Analysismentioning

confidence: 99%

“…They were set at each site in the same pattern as the pan traps. Besides pitfall traps, boat-shape traps with a sex pheromone lure were set to sample Plutella xylostella (Linnaeus, 1758) males (Zhang et al, 2021). All specimens were transferred into 80% ethanol in tubes and identified to the lowest possible taxonomic level using the molecular barcoding procedures given by Saqib et al (2022).…”

Section: Arthropod Sampling and Identificationmentioning

confidence: 99%

“…small streams or ponds) (Figure 1b). The proportion of different land use types was calculated for five different spatial scales, 100, 200, 300, 400, and 500 meter radius around the focal field, by using QGIS 3.4 (for details, see Zhang et al (2021)).…”

Section: Study Area and Land Use Analysismentioning

confidence: 99%

“…Indeed, other than a few examples, the majority of the studies on the effects of functional diversity on ecosystem functioning were conducted on a fine (and/or a single) spatial scale (Gonzalez et al, 2020). Although Zhang et al (2021) showed varying effects of habitats on the taxonomic diversity of arthropod communities across five different spatial scales in managed brassica vegetables, it is largely unknown if these changes in taxonomic diversity are accompanied by similar trends in functional diversity.…”

Section: Introductionmentioning

confidence: 99%

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Contrasting roles of landscape compositions in shaping functional traits of arthropod community in subtropical vegetable fields

Zhang

Saqib

Niu

et al. 2022

Preprint

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Agricultural intensification and land use transformation are among the main driving forces of the unprecedented decline of biodiversity and ecosystem services in croplands. Trait-based approaches provide a unique framework to detect the potential mechanisms of how this intensification affects biodiversity and alter ecosystem services. However, the potential relationship between arthropod traits and various types of habitats is still poorly understood, especially in subtropical vegetable agroecosystems.Here, we conducted a trait-based approach to evaluate the variable roles of different habitats on functional trait diversity and the structure of the arthropod community in brassica vegetable crops. Twenty-three conventional cruciferous vegetables fields were sampled over two years in three regions in Fujian, China. We found that the increasing proportion of non-brassica vegetable plantations and water bodies negatively affected the functional diversity of arthropods, whereas forest and grassland habitats showed a positive correlation, indicating habitat filtering for certain traits or trait combinations.This study demonstrates the importance of landscape composition as an ecological filter for vegetable arthropod community, and identifies how the proportion of different habitats selected for or against specific functional traits. Our findings support that increasing forest and grassland areas adjacent to vegetable fields can play a vital role in promoting the functional diversity of arthropod communities. Since the natural enemy assemblages supported by these habitats bear combinations of diverse traits adapted to disturbance, they have the potential to enhance pest suppression in the highly variable environment of vegetable crops.

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Remote sensing reveals the importance of seminatural habitat and irrigation on aphid biocontrol in arid agroecosystems

Call,

Akiba,

Pringle

2024

Ecol Sol and Evidence

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Remote sensing and spatial analyses are increasingly used to understand the role of seminatural habitats in biocontrol, but knowing how to best leverage these tools is a persistent challenge. In arid agroecosystems, irrigation often exaggerates the differences between crop fields and their interspaces. Weeds adjacent to irrigated fields are thus often some of the only persistent vegetation. Remote sensing may be essential to capture the effect of this fine‐scale variation on pest biocontrol. We examined the role of land‐cover in determining the degree of aphid pest pressure and biocontrol in irrigated alfalfa fields in the Great Basin Desert (Nevada, USA). We experimentally manipulated predator densities to determine true agents of aphid biocontrol in this system. We then assessed land‐cover and spatial scale using alternative methods to determine the approaches that best defined the combined direct and indirect effects of seminatural habitat on aphid pest suppression. A remote‐sensing approach revealed the importance of land‐cover to aphid biocontrol more clearly than conventional vegetation surveys. In particular, remote sensing revealed that weedy patches within alfalfa fields reduced aphid densities, whereas flood irrigation increased aphid densities. Our experiments confirmed that coccinellid beetles are important aphid biocontrol agents. Coccinellids were positively associated with weedy land‐cover that was spatially close to alfalfa fields, particularly in the spring. Other predator taxa were also associated with distinct landscape features, though these associations varied between spring and fall. Solution: Weedy seminatural habitat near alfalfa fields, occurring along field margins and the banks of irrigation ditches, was positively associated with the density of coccinellid beetles and associated aphid pest suppression. Remote sensing excelled at identifying these areas and their effects, highlighting its utility as a management tool. Preserving these weedy areas can enhance aphid biocontrol, but farmers must consider potential trade‐offs between the control of insect‐pests and weeds.

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Landscape composition mediates suppression of major pests by natural enemies in conventional cruciferous vegetables

Cited by 13 publications

References 55 publications

Gut microbiota assemblages of generalist predators are driven by local- and landscape-scale factors

Gut microbiota assemblages of generalist predators are driven by local- and landscape-scale factors

Contrasting roles of landscape compositions in shaping functional traits of arthropod community in subtropical vegetable fields

Remote sensing reveals the importance of seminatural habitat and irrigation on aphid biocontrol in arid agroecosystems

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