Environmental characteristics of the six bioregions from the Interim Biogeographic Regionalisation for Australia Framework (IBRA) sampled within the study region.

1<p>BHC = Broken Hill Complex; MDD = Murray Darling Depression; RIV = Riverina, NSS = NSW South-Western Slopes, SEH = South-Eastern Highlands, COAST = combined Sydney Basin and South-East Corner bioregions. Bioregion means are averages of site-level data within each bioregion.</p>2<p>Mean climatic data (1910–2010) were determined for the May to October growing season (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049000#s2" target="_blank">methods</a>).</p>3<p>Edaphic factors were measured during October–December 2009.</p><p>Tmax = maximum temperature, Tmin = minimum temperature, Tav = average temperature, PET = potential evapotranspiration, atmospheric water balance (AWB) = precipitation – PET <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049000#pone.0049000-Rasmusson1" target="_blank">[64]</a>, Aridity Index = precipitation/PET <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049000#pone.0049000-Lioubimtseva1" target="_blank">[65]</a>.</p>