Table 3. Correlation coefficient between weather variables and the proportion of trees surveyed [excluding trees in the transgenic plot (T0)] with GUS positive seeds for 7 years (2004–2010) with mean and standard deviation of each weather variable during years where gene flow was observed (2006, 2007, 2008) or was not observed (2004, 2005, 2009, 2010).

Weather variable	Correlation coefficient	Mean and standard deviation during flow years	Mean and standard deviation during non-flow years
Air temperature (C)	0.505	12.671(0.591)	12.662(3.740)
Air temperature >9 Ca	0.561	0.684(0.039)	0.602(0.178)
Rainfall (mm)	−0.732*	0.015(0.016)	0.021(0.020)
Relative humidity (%)	−0.386	50.908(1.656)	52.047(12.807)
Air temperature >9 C and no rainfallb	0.694*	0.673(0.046)	0.596(0.174)
Wind speed (m/s)	0.589	2.621(0.600)	2.244(0.418)
Hourly evaporation (mm)	0.549	0.099(0.054)	0.078(0.023)
Total PAR (µmol/m2/s)	0.063	49.660(4.502)	48.825(15.338)

^* P<0.10.

^aProportion of 10-minute increments during the bloom period each year where air temperature was greater than 9 C.

^bProportion of 10-minute increments during the bloom period each year when it was not raining and air temperature was greater than 9 C.