“…As for European oaks, Q. petraea (Broadmeadow et al, 1999;Broadmeadow and Jackson, 2000;Karlsson et al, 2004), Q. robur (e.g. Broadmeadow et al, 1999;Broadmeadow and Jackson, 2000;Karlsson et al, 2004), Q. ilex (Inclán et al, 1999;Manes et al, 1998;Ribas et al, 2005aRibas et al, , 2005b and Q. coccifera have been exposed previously to enhanced ozone levels. Such studies focussed on one or two oak species, sometimes comparing them with species of other genera.…”