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Alternatively, organic control of crop pests by pure enemies could additionally be enhanced by sustaining pure and seminatural vegetation in agricultural landscapes, thereby permitting pure enemies to maneuver among habitats that provide them with refugia and sources that may be scarce in crop fields . Losey and Vaughan estimated that insect predators and parasitoids performing as natural enemies of crop pests save $4.5 billion in the United States each year by decreasing crop losses to insect injury and lowering expenditures on insecticides. Thus, ignoring or failing to appropriately handle oblique results in the united states food and agriculture system might have serious financial implications. Regarding the use of bioindicators for monitoring and assessment of heavy metal pollution, Morgan summarizes that “a extra meaningful evaluation of the impression of metal pollution may be obtained by measuring steel concentrations in chosen species of the resident biota.” Different plant and animal species have been used as organic indicators or bioindicators to assess and monitor heavy metallic contamination and pollution within the setting. Different environmental biomarkers are additionally used to assess and monitor pollution pertaining to heavy metals within the surroundings. Heavy metals and metalloids are launched into soils from the parent material and different anthropogenic sources .
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