A critical assessment of marine predator isoscapes within the southern Indian Ocean

Table 2 Pearson’s correlation coefficient (R), p-value (P) and formula resulting from a Pearson’s correlation between plasma δ¹³C and δ¹⁵N values of albatrosses and giant petrels versus latitude (lat) and longitude (lon) of their mean foraging locations calculated from GPS tracks. ^a indicates a significant correlation

	δ¹³C vs Latitude			δ¹³C vs Longitude			δ¹⁵N vs Latitude			δ¹⁵N vs Longitude
Species	R	P	Formula	R	P	Formula	R	P	Formula	R	P	Formula
All species combined
	0.73	< 0.01^a	δ¹³C = 0.21 (lat) - 11.25	0.12	0.17	δ¹³C = 0.02 (lon) - 21.48	0.44	< 0.01^a	δ¹⁵N = 0.12 (lat) + 18.29	0.24	0.19	δ¹⁵N = 0.02 (lon) + 13.33
Albatrosses
Wandering	0.78	< 0.01^a	δ¹³C = 0.17 (lat) - 12.76	0.21	0.25	δ¹³C = 0.03 (lon) - 21.55	0.76	< 0.01^a	δ¹⁵N = 0.11 (lat) + 19.19	0.24	0.19	δ¹⁵N = 0.02 (lon) + 13.33
Grey-headed	0.83	< 0.01^a	δ¹³C = 0.24 (lat) - 8.81	0.27	0.17	δ¹³C = 0.03 (lon) - 21.40	− 0.11	0.57	δ¹⁵N = 0.01 (lat) + 10.74	−0.36	0.06	δ¹⁵N = 0.02 (lon) + 12.09
Sooty	0.25	0.27	δ¹³C = 0.06 (lat) - 18.00	−0.02	0.93	δ¹³C = 0.004 (lon) - 20.63	0.09	0.69	δ¹⁵N = 0.01 (lat) + 12.67	− 0.45	0.03^a	δ¹⁵N = 0.06 (lon) + 14.35
Giant petrels
Northern	0.37	0.05^a	δ¹³C = 0.17 (lat) - 12.71	−0.31	0.11	δ¹³C = 0.09 (lon) - 16.79	0.29	0.14	δ¹⁵N = 0.08 (lat) + 17.81	− 0.16	0.43	δ¹⁵N = 0.03 (lon) + 15.33
Southern	0.47	0.02^a	δ¹³C = 0.10 (lat) - 17.73	− 0.07	0.77	δ¹³C = 0.01 (lon) - 22.52	0.58	< 0.01^a	δ¹⁵N = 0.09 (lat) + 17.43	−0.12	0.58	δ¹⁵N = 0.01 (lon) + 12.99

ISSN: 2051-3933