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2. Baillie, S.R., Marchant, J.H., Leech, D.I., Joys, A.C., Noble, D.G., Barimore, C., et al., 2010. Breeding Birds in the Wider Countryside: Their Conservation Status 2009. BTO, Thetford. BTO Research Report No. 541. Available from: http://www.bto.org/birdtrends.
3. Interaction strengths in food webs: issues and opportunities;Berlow;J. Anim. Ecol.,2004
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