Table 4.

Univariate regressions of the difference in mean sideroxylonal concentration between Huntly and Lake Tyers on bioclimatic variables

Variable	Bioclimatic parameter (P)	Units	Regression slope	R2	F	P
Annual mean temperature	1	°C	0·29	0·10	1·81	0·23
Mean diurnal temperature range	2	°C	−0·33	0·81	31·47	0·0014
Isothermality*	3	%	1·01	0·01	1·06	0·34
Temperature seasonality†	4	%CV	−7·2E-03	0·84	36·92	0·0009
Maximum temperature of warmest month	5	°C	−0·24	0·79	27·32	0·0020
Minimum temperature of coldest month	6	°C	0·32	0·77	25·01	0·0024
Temperature annual range	7	°C	−0·15	0·90	60·95	0·0002
Mean temperature of wettest quarter	8	°C	0·054	0·10	1·80	0·23
Mean temperature of driest quarter	9	°C	−0·088	0·13	2·05	0·20
Mean temperature of warmest quarter	10	°C	−0·26	0·08	1·59	0·25
Mean temperature of coldest quarter	11	°C	0·32	0·67	15·25	0·0079
Annual precipitation	12	mm	0·013	0·04	1·29	0·30
Precipitation of wettest month	13	mm	0·102	0·03	1·20	0·31
Precipitation of driest month	14	mm	0·087	−0·13	0·21	0·66
Precipitation seasonality‡	15	%CV	−0·094	−0·15	0·09	0·78
Precipitation of wettest quarter	16	mm	0·047	0·07	1·50	0·27
Precipitation of driest quarter	17	mm	0·034	−0·09	0·41	0·54
Precipitation of warmest quarter	18	mm	0·023	−0·01	0·92	0·37
Precipitation of coldest quarter	19	mm	0·052	−0·12	0·23	0·65
Latitude		°	0·60	−0·05	0·69	0·44
Longitude		°	−2·69	0·05	1·34	0·29
Altitude		m	−0·033	0·55	9·51	0·022

Tests significant at the α = 0·05 level after correction for false discovery rate are shown in bold. Units for regression slopes are sideroxylonal mg g⁻¹ of dry matter per °C, mm or %CV.

* Isothermality measured as (P2/P7) × 100.

^† Coefficient of variation based on temperatures measured in K.

^‡ Coefficient of variation based on temperatures measured in mm.