“…δ 13 C of NVP can be used to trace environmental CO 2 gradients (Flanagan et al, 1999;Lakatos et al, 2007;Meyer et al, 2008), whereas fossil bryophytes record ancient CO 2 levels (Fletcher et al, 2005(Fletcher et al, , 2006. Additionally, epiphytic plants function as atmospheric water traps (Helliker and Griffiths, 2007;Helliker 2011). Because epiphytic NVP are commonly in equilibrium with water vapour, it is inferred that δ 18 O of bulk water and organic material might serve as a short and long-term recorder for atmospheric vapour, respectively (Helliker and Griffiths, 2007;Hartard et al, 2008Hartard et al, , 2009).…”