PUBLISHED: JULY 2011

Morphological Variation in the Seed of Gray Birch (Betula populifolia): The Effects of Soil-Metal Contamination

Figure 4

Figure 4

Figure 4: The relationship between the mean wing-loading rates and TML. The polynomial regression indicates that while a threshold model may be present, the regression was not statistically significant (r2 = 0.15, p = 0.55).