Review Published on 12 Jan 2015 Ecosystem services—current challenges and opportunities for ecological research in Agroecology Klaus BirkhoferEva DiehlJesper AnderssonJohan EkroosAndrea Früh-MüllerFranziska MachnikowskiViktoria L. MaderLovisa NilssonKeiko SasakiMaj Rundlöf Frontiers in Ecology and Evolution doi 10.3389/fevo.2014.00087 74,373 views 181 citations