Anthropogenic increased nitrogen deposition is a well-known environmental stressor, resulting in impoverishment of soil quality in naturally nutrient-poor ecosystems. As a result, habitat conditions for plant and animal species are also changing. Such changes are sometimes clearly visible in the field. For instance, plant species that benefit from extra nitrogen often become dominant, leading to grass-dominance in heathlands and increasing cover of blueberries and bramble in woodlands. Less visible however are the effects of nitrogen deposition on food quality of plants, and the subsequent effects on animal fitness.
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Source: Phys.org