Table 1.
Relative consumption levels overall, of various pest and predatory arthropod taxa by their predators, indicating the two most significant consumers for each prey item. Values are median proportions of individual predators’ tissues in the diets of the other predators, within 95% credible intervals (lower limit at 2.5% and upper limit at 97.5%). MSP = Most significant predator.
Fig 1.
MixSIAR modelling results showing general patterns of pest consumption and intraguild predation as depicted by Isospace plot of overall predator-prey association densities (A and C), and by Posterior density plots for the predators (B and D).
Plots indicate 95% credible interval overlaps in estimated proportions of food source contributions to consumer diets. PhytoBettlles = Phytophagoues beetles; PhytoBugs = Phytophagous bugs.
Fig 2.
Boxplots showing a summarized comparison of relative significance of each of the five predatory arthropod taxa as either pest consumers or as intraguild predators.
Plots are drawn from MixSIAR models of estimated proportional contributions food sources (pests and predators) to consumer diets. Box bars represent standard deviations (n = 3 for pest consumption and n = 5 for intraguild predation).
Fig 3.
Estimated dietary contributions of the three pest taxa and five arthropod natural enemies to diets of their respective predators: A) Overall and B) By each prey food source.
Box whiskers indicate standard errors, the top and bottom bars of boxes indicate 75th and 25th quartiles and the middle bars indicate mean values.
Table 2.
Overall levels of pest consumption and intraguild predation regardless of predator identity. Values are median proportions of individual predators’ tissues in the diets of the other predators, within 95% credible intervals.
Table 3.
Summarized comparisons of proportional contributions of arthropod food sources to diets of their predatory consumers through the two trophic pathways of either pest consumption or intraguild predation, across the two treatment levels of farming system and cropping method. SD = Standard deviation.
Fig 4.
Box-and-whisker plots showing estimated dietary contribution of the five arthropod natural enemies to diets of the respective intraguild consumers in response to: A) Cropping method and B) Farming system.
Box whiskers indicate standard errors, the top and bottom bars of boxes indicate 75th and 25th quartiles and the middle bars indicate mean values.
Fig 5.
Relationship between cropping method (monoculture vs intercropping) and farming system (low-intensity vs conventional) on overall consumption of the three pest and five natural enemy taxa by their predators.