Impact Type: Deposition of pollutant
Current work suggests that N deposition leads to habitat change, with a loss of Racomitrium heath (Milne & Hartley 2001). This impacts on the birds through loss of nesting sites and reduction in insect prey (sawfly larvae) for the chicks (van de Wal pers comm.).
The move from moss dominated heath to grasses also increases trampling by sheep, so increasing the risk of destruction of nests and eggs.