Turnover of carbon isotopes in tail hair and breath CO 2 of horses fed an isotopically varied diet Ayliffe, L. K. ; Cerling, T. E. ; Robinson, T. ; West, A. G. ; Sponheimer, M. ; Passey, B. H. ; Hammer, J. ; Roeder, B. ; Dearing, M. D. ; Ehleringer, J. R. Abstract Publication: Oecologia Pub Date: March 2004 DOI: 10.1007/s00442-003-1479-x Bibcode: 2004Oecol.139...11A