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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

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

  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 < 0.01a δ13C = 0.21 (lat) - 11.25 0.12 0.17 δ13C = 0.02 (lon) - 21.48 0.44 < 0.01a δ15N = 0.12 (lat) + 18.29 0.24 0.19 δ15N = 0.02 (lon) + 13.33
Albatrosses
 Wandering 0.78 < 0.01a δ13C = 0.17 (lat) - 12.76 0.21 0.25 δ13C = 0.03 (lon) - 21.55 0.76 < 0.01a δ15N = 0.11 (lat) + 19.19 0.24 0.19 δ15N = 0.02 (lon) + 13.33
 Grey-headed 0.83 < 0.01a 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 0.03a δ15N = 0.06 (lon) + 14.35
Giant petrels
 Northern 0.37 0.05a 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 0.02a δ13C = 0.10 (lat) - 17.73 − 0.07 0.77 δ13C = 0.01 (lon) - 22.52 0.58 < 0.01a δ15N = 0.09 (lat) + 17.43 −0.12 0.58 δ15N = 0.01 (lon) + 12.99