When natural habitat fails to enhance biological pest control – Five hypotheses - Tscharntke, Teja; Karp, Daniel S.; Chaplin-Kramer, Rebecca; Batáry, Péter; DeClerck, Fabrice; Gratton, Claudio; Hunt, Lauren; Ives, Anthony; Jonsson, Mattias; Larsen, Ashley; Martin, Emily A.; Martínez-Salinas, Alejandra; et al. (Elsevier, 2016)