marginally non-significantp = 0.06
The Levins's niche breadth in the diets of dab showed no relationship with trawling ( F 1,14 = 0.009, p = 0.926), while for plaice there was a marginally non-significant positive relationship ( R 2 = 0.278, F 1,13 = 4.616, p = 0.06; figure 4 b ).