Table 2. Summary statistics for least squares regressions examining relationships between individual jellyfish size and bell stable isotope ratios (mass, length and δ¹⁵N data log₁₀ transformed, δ¹⁵C data log₁₀ + 40 transformed).

NB: in all cases slopes were significantly different from 1.

Species	Isotope	Comparison	Intercept (±SE)	Slope (±SE)	R 2	F	P
A. aurita	δ13C (−21.1 to −17.2‰)	Bell diameter (6 to 36 cm)	1.224 (0.019)	0.079 (0.015)	0.39	F1,41 = 26.3	<0.001
A. aurita	δ15N (6.7 to 14.8‰)	Bell diameter (6 to 36 cm)	0.609 (0.056)	0.305 (0.045)	0.53	F1,41 = 46.2	<0.001
A. aurita	δ13C (−21.1 to −17.2‰)	Wet mass (12 to 1,702 g)	1.256 (0.013)	0.029 (0.006)	0.40	F1,41 = 26.9	<0.001
A. aurita	δ15N (6.7 to 14.8‰)	Wet mass (12 to 1,702 g)	0.730 (0.038)	0.111 (0.016)	0.54	F1,41 = 48.8	<0.001
C. lamarckii	δ13C (−21.6 to −18.5‰)	Bell diameter (4 to 20 cm)	1.287 (0.019)	0.018 (0.019)	0.02	F1,35 = 0.85	=0.363
C. lamarckii	δ15N (7.7 to 15.8‰)	Bell diameter (4 to 20 cm)	0.939 (0.067)	0.103 (0.066)	0.06	F1,35 = 2.4	=0.131
C. lamarckii	δ13C (−21.6 to −18.5‰)	Wet mass (3 to 493 g)	1.293 (0.013)	0.006 (0.007)	0.02	F1,35 = 0.71	=0.405
C. lamarckii	δ15N (7.7 to 15.8‰)	Wet mass (3 to 493 g)	0.985 (0.047)	0.030 (0.025)	0.04	F1,35 = 1.50	=0.229
C. capillata	δ13C (−21.8 to −17.2‰)	Bell diameter (6 to 85 cm)	1.233 (0.020)	0.062 (0.014)	0.32	F1,41 = 19.1	<0.001
C. capillata	δ15N (7.6 to 16.1‰)	Bell diameter (6 to 85 cm)	0.876 (0.046)	0.157 (0.034)	0.34	F1,41 = 22.0	<0.001
C. capillata	δ13C (−21.8 to −17.2‰)	Wet mass (19 to 23,680 g)	1.259 (0.015)	0.020 (0.005)	0.28	F1,41 = 16.1	<0.001
C. capillata	δ15N (7.6 to 16.1‰)	Wet mass (19 to 23,680 g)	0.931 (0.035)	0.055 (0.012)	0.35	F1,41 = 22.1	<0.001