Table 4. Results of redundancy analysis (RDA) of variation in diet composition of swordfish (based on prey numbers).

Values of F and associated probability (p-value) are tabulated for two sets of model runs. The variable ‘year’ (fishing season) was divided into three categories (2007, 2008–2010 and 2011–2014) and converted into three (0,1) dummy variables. Since the category may be identified once the values of two of the dummy variables have been defined, all three dummy variables cannot be included in the same run of the model. Left: model runs excluding 2011–2014. Right: model runs excluding 2007. (EFL = eye to fork length, Area = within the SCB and beyond the SCB, Half-year = August 15^th through November 7^th and November 8^th through January 31^st).

Variable	F-statistics	p-value	F-statistics	p-value
EFL	4.117	0.005	4.254	0.005
Area	3.896	0.005	3.895	0.005
2007	3.383	0.005
Half-year	2.025	0.005	2.123	0.005
2011–2014			5.016	0.005
2008–2010	3.568	0.005	1.042	0.415
SST	0.758	0.785	0.758	0.815