A study identified two factors that may limit breeding productivity of the Reed Bunting Emberiza schoeniclus, which is in significant decline in England since the 1990s: ground vegetation providing concealment from nest predators and availability of invertebrate prey for chicks. The increased use of pesticides may have reduced invertebrate densities on most farmland.
Source: Brickle NW and Peach WJ (2004) Ibis 146: 69-77
ftp://80.57.161.240/artikelen/R/Rietgors6.pdf
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