Reference

Nyström M, Norström AV, Blenckner T, de la Torre-Castro M, Eklöf JS, Folke C, Österblom H, Steneck RS, Thyresson M & Troell M (2012). Confronting feedbacks of degraded marine ecosystems. Ecosystems 15(5):695–710.
O’Gorman EJ, Fitch JE & Crowe TP (2012). Multiple anthropogenic stressors and the structural properties of food webs. Ecology 93(3):441–448.