Trophic Hierarchies Illuminated via Amino Acid Isotopic Analysis Steffan, Shawn A. ; Chikaraishi, Yoshito ; Horton, David R. ; Ohkouchi, Naohiko ; Singleton, Merritt E. ; Miliczky, Eugene ; Hogg, David B. ; Jones, Vincent P. Abstract Publication: PLoS ONE Pub Date: September 2013 DOI: 10.1371/journal.pone.0076152 Bibcode: 2013PLoSO...876152S