Data from: Landscape-scale interactions of spatial and temporal cropland heterogeneity drive biological control of cereal aphids
Bosem Baillod, Aliette, University of Göttingen
Tscharntke, Teja, University of Göttingen
Clough, Yann, University of Göttingen, Lund University
Batáry, Péter, University of Göttingen
Published Mar 21, 2018 on Dryad.
Cite this dataset
Bosem Baillod, Aliette; Tscharntke, Teja; Clough, Yann; Batáry, Péter (2018). Data from: Landscape-scale interactions of spatial and temporal cropland heterogeneity drive biological control of cereal aphids [Dataset]. Dryad. https://doi.org/10.5061/dryad.2tf5j
1. Agricultural landscapes are characterised by dynamic crop mosaics changing in composition and configuration over space and time. While semi-natural habitat has been often shown to contribute to pest biological control, the effects of increasing landscape heterogeneity with cropland has been disregarded. Here, we examine how cereal aphids, their enemies and biological control are affected by the composition and configuration of the crop mosaic and its inter-annual change due to crop rotation. 2. We studied the abundance of cereal aphids, natural enemies and aphid parasitism over two years on 51 winter wheat fields. Arthropods were monitored at three distances (0, 10, 30m) from field borders. Fields were embedded in landscapes of 1-km diameter selected along orthogonal gradients of compositional crop heterogeneity (crop diversity), configurational heterogeneity (field border and grassy field boundary length) and inter-annual change in cover of aphid host habitats (cereal, maize and grassland). We aimed to disentangle spatial and temporal heterogeneity effects through these independent landscape gradients. 3. Aphid densities were lower in landscapes with smaller field size (more field borders) coupled with high amounts of grassy field boundaries. Aphid densities decreased also in landscapes with higher crop diversity when the cover of aphid host habitat had decreased from the year before. Aphid natural enemy densities decreased with smaller field size and high amounts of grassy field boundaries. Aphid parasitism decreased with the inter-annual expansion in aphid host habitat, but only in landscapes with small field sizes. 4. Synthesis and applications. Our study shows for the first time that cereal aphid numbers can be reduced by optimizing the composition, configuration and temporal heterogeneity of the crop mosaic. We highlight the value of maintaining small field sizes in agricultural landscapes and high densities of grassy boundaries for reducing aphid abundance. Landscape-wide crop diversification can reduce aphid densities as well. 13-Mar-2017
Data collected in the field and used for the analysis. Column description: "Landscape" is the ID of the wheat field within a 500m radius landscape. "Sampling_Year" is the year of the data collection. "Within_field_position" denotes the transects where arthropods have been collected. "Aphid_density" and "Predator_density" are aggregated numbers of aphids and predators respectively, collected at each transect. "Predator_Prey_ratio" is the ratio between predator and prey numbers. "Parasitism_rate" is the proportion of parasitized aphids. The remaining columns are the landscape variables crop Shannon diversity (SHDI), field border length in kilometers (FBL_Km), grassy field boundary length in kilometers (GBL_Km) and the annual change in aphid host habitats (%_ΔHab).