Skip to main content

Table 1 Delipidated or normalized plasma δ13C and raw plasma δ15N values of albatrosses, giant petrels, and penguins breeding at Marion Island, which were tracked simultaneously with GPS data loggers during 2015–2018. Number of individuals indicates number of birds with tracks and corresponding stable isotopic values. Number of tracks indicates number of tracks used to estimate mean foraging locations as multiple tracks were recorded for brooding individuals (See Materials and Methods). Values given as mean ± SD (range)

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

Common name Number of individuals Number of tracks per species Number of tracks per individual δ13C (‰) δ15N (‰)
Albatrosses
 Wandering 32 32 1.0 ± 0.0 (1; 1) −20.7 ± 1.5 (−23.6; −18.4) 14.0 ± 1.0 (12.1; 15.5)
 Grey-headed 28 36 1.3 ± 0.5 (1; 2) − 20.2 ± 1.0 (−22.0; − 18.5) 11.4 ± 0.4 (10.4; 12.4)
 Sooty 22 36 1.6 ± 0.7 (1; 3) −20.8 ± 0.7 (− 22.2; − 19.8) 12.0 ± 0.4 (11.4; 13.1)
Giant petrels
 Northern 27 29 1.1 ± 0.3 (1; 2) −19.8 ± 1.2 (− 22.7; − 17.1) 14.4 ± 0.8 (12.7; 15.9)
 Southern 23 25 1.1 ± 0.3 (1; 2) −22.7 ± 0.5 (− 23.6; − 21.8) 12.8 ± 0.4 (12.3; 13.4)
Penguins
 Gentoo 17 26 1.5 ± 0.9 (1; 4) − 21.7 ± 0.6 (− 23.2; − 20.9) 10.2 ± 0.5 (9.5; 11.4)
 Macaroni 18 29 1.6 ± 0.8 (1; 3) −22.3 ± 0.2 (− 22.7; − 22.0) 8.8 ± 0.3 (8.0; 9.2)
 Rockhopper 9 19 2.1 ± 1.1 (1; 4) −22.6 ± 0.2 (− 22.9; − 22.1) 8.6 ± 0.4 (7.7; 9.1)