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Table 3 Isotopic niche metrics of Gentoo Penguins Pygoscelis papua. Parameters are based on carbon (δ13C) and nitrogen (δ15N) stable isotopes of chick feather samples as a marker of breeding season foraging ecology from two colonies at New Island and two breeding seasons calculated with the SIAR package. SE South End colony, NE North End colony

From: How animals distribute themselves in space: variable energy landscapes

Symbol Explanation NE, 2013 SE, 2013 NE, 2014 SE, 2014
n = 20 n = 20 n = 18 n = 20
LOC Location of centroid (mean δ13C, mean δ15N) −15.73, 14.45 −15.49, 14.39 −16.04, 14.75 −15.94, 14.71
SEA Area of the standard ellipse (isotope niche width) 0.34 0.63 0.15 0.19
SEAc as above, corrected for sample size 0.36 0.67 0.16 0.20
NR trophic length (range in δ15N) 1.46 1.74 1.40 0.99
CR diversity of basal resources (range in δ13C) 0.96 2.19 0.82 0.99
CD niche width 2 (Mean distance to centroid) 0.43 0.52 0.31 0.29
NND mean Nearest Neighbour Distance 0.16 0.26 0.13 0.15