Journal of Biogeography
SUPPORTING INFORM ATION
Mirkka M. Jones, Neil Gibson, Colin Yates, Simon Ferrier, Karel Mokany, Kristen J.
Williams, Glenn Manion and Jens-Christian Svenning
Appendix S1 Fractions of deviance in species turnover explained by selected sets of climatic and topographic variables, soil variables and geographical distances
Table S1 Deviance in species turnover (%) across 650 floristic inventory plots in the south-west Australian wheatbelt region explained by selected sets of climatic/topographic vs. soil variables and geographical distances (GD) .
The relative sizes of fractions A-G, corresponding to the unique and shared contributions of these sets of variables to explained deviance, are illustrated in Fig. 1.
Explanatory dataset Explained deviance
Total (Clim./Topo.  Soils  GD) 33.5
Clim./Topo. alone (A) 7.7
Soils alone (B)
GD alone (C)
16.1
0.0
Clim./Topo.  Soils excl. GD (D) 0.6
Soils  GD excl. Clim./Topo. (E) 0.1
GD  Clim./Topo. excl. Soils (F) 6.8
Clim./Topo.  Soils  GD (G) 2.2
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Appendix S2 Ten species with the strongest positive and negative correlations with site scores on residual PCoA axes 1 and 2, their life form, and geographical range in
Australia.
Table S2 Ten species with the strongest positive and negative correlations with site scores on residual PCoA axes 1 and 2 (in descending order of absolute value), their life form, and geographical range in Australia, if found outside the South-West
Australian Floristic Region (SWAFR), as assessed from maps of occurrence records in the online Atlas of Living Australia portal (ala.org.au). Australian state names are abbreviated as follows: Q – Queensland, NSW – New South Wales, SA – South
Australia, T – Tasmania, V – Victoria, WA – Western Australia.
Residual axis 1 – species with positive correlations
Neurachne alopecuroides R.Br. (perennial graminoid; distribution extends into southern SA, V)
Amphipogon turbinatus R.Br. (perennial graminoid)
Lysinema ciliatum R.Br. (shrub)
Drosera macrantha Endl. (geophyte; distribution extends into SA, V, T)
Lepidobolus chaetocephalus Benth. (perennial herb)
Hibbertia gracilipes Benth. (shrub)
Baeckea preissiana (Schauer) F.Muell. (shrub)
Allocasuarina humilis (Otto & A.Dietr.) L.A.S.Johnson (shrub)
Melaleuca tuberculata Schauer (shrub)
Hakea incrassata R.Br. (shrub)
Residual axis 1 – species with negative correlations
Austrostipa elegantissima (Labill.) S.W.L.Jacobs & J.Everett
(perennial graminoid; widely distributed across southern Australia, extending into semi-arid inland areas)
Enchylaena tomentosa R.Br.
(shrub; widely distributed across much of Australia, excluding T)
Crassula colorata (Nees) Ostenf.
(annual herb; widely distributed across southern to central Australia, excluding T)
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Rhagodia drummondii Moq.
(scrambling shrub – mainly SWAFR, but extends into semi-arid inland areas in WA and SA)
Calotis hispidula (F.Muell.) F.Muell.
(Annual herb; widely distributed across Australia (except T) including arid central and northern areas)
Austrostipa trichophylla (Benth.) S.W.L.Jacobs & J.Everett
(perennial graminoid; widely distributed across southern (except T) and central
Australia)
Sclerolaena diacantha (Nees) Benth.
(perennial herb; widely distributed across central and southern Australia, except T and east coast)
Erodium cygnorum Nees
(annual herb; widely distributed across southern to central Australia , except T and east coast)
Trachymene cyanopetala (F.Muell.) Benth.
(annual herb; southern distribution extending into SA, V, NSW, but not T)
Senecio glossanthus (Sond.) Belcher
(annual herb; widely distributed across southern (except T) and central Australia)
Residual axis 2 – species with positive correlations
Eucalyptus salmonophloia F.Muell. (tree)
Olearia muelleri (Sond.) Benth.
(shrub – distribution extends into semi-arid parts of SA, V, NSW)
Sclerolaena diacantha (Nees) Benth.
(perennial herb; widely distributed across semi-arid to arid Australia)
Enchylaena tomentosa R.Br.
(shrub; widely distributed across much of Australia, excluding T)
Templetonia sulcata (Meisn.) Benth.
(leafless shrub; extends into parts of semi-arid southern to eastern Australia)
Rhagodia drummondii Moq.
(scrambling shrub – mainly SWAFR, but extends into semi-arid inland areas in WA and SA)
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Exocarpos aphyllus R.Br.
(hemiparasitic leafless shrub; widely distributed across southern to semi-arid parts of SA, V, NSW and into Q)
Atriplex vesicaria Heward ex Benth.
(shrub; very wide distribution across semi-arid and arid inland Australia)
Rhagodia preissii Moq.
(shrub; distribution extends along central coast of WA and into southernmost SA)
Acacia erinacea Benth.
(shrub – mainly south-west WA but extends slightly into SA near the coast)
Residual axis 2 – species with negative correlations
Blennospora drummondii A.Gray
(Annual herb; distribution extends into southern SA and V)
Schoenus nanus (Nees ex Lehm.) Benth.
(Annual sedge; distribution extends into parts of southern SA and V)
Hydrocotyle callicarpa Bunge
(Annual herb; distribution extends into southern SA, V, NSW and T)
Trachymene pilosa Sm.
(Annual herb; distribution extends into parts of southern SA to V and NSW)
Gonocarpus nodulosus Nees (Annual herb)
Phyllangium sp.
Dunlop (Annual herb; entire genus predominantly south temperate in distribution)
Wahlenbergia preissii de Vriese (Annual herb; distribution extends into SA)
Podolepis lessonii (Cass.) Benth. (Annual herb; mainly south to south-central WA)
Drosera glanduligera Lehm.
(Annual herb; distribution extends across temperate south-eastern Australia)
Millotia tenuifolia Cass.
(Annual herb; distribution extends into southern SA, NSW and V and T)
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Appendix S3 Locations of plots on granite outcrops and their site scores on residual
PCoA axis 2
Figure S3 Locations of 650 floristic inventory plots in the south-west Australian wheatbelt region. For those 108 plots associated with granite rock outcrops, coloured circles illustrate site scores on the second axis of a PCoA ordination of the residuals of a generalized dissimilarity model (GDM) of species turnover parameterised for all
650 sites. The locations of the remaining sites are indicated by grey dots. The equivalent map with site scores for all 650 plots is in Fig. 4b. The GDM was parameterised with climatic, topographic and soil variables and inter-site geographical distances. Hence, these residual patterns represent species turnover that was unexplained by either present-day environmental conditions, as captured in the model, or by geographical distance. Red circles indicate positive ordination axis scores and light blue circles indicate negative scores. The larger the circle the greater the absolute value. Hence sites represented by large red circles are, on average, most floristically distinct from sites represented by large blue circles. Most granite outcrop plots (81%) had negative scores on this residual axis.
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