Yellow pansy populations will suffer under either very intense grazing that removes most vegetation ( including the pansy ), or undergrazing in which non-native grasses are allowed to grow tall and dense.
2.
This was due to a combination of factors including drainage, inappropriate water levels, poor ditch management, lack of pest and weed control, and water pollution and sedimentation due to discharge and agricultural runoff; undergrazing was also a problem for one of the grassland areas.
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