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mms12131-sup-0001-FigS1.pdfapplication/PDF200KTable S1. Table indicating the narwhal samples used for each analysis.
mms12131-sup-0002-FigS2.pdfapplication/PDF278KFigure S1. Standard ellipse area (per mil2) for skin and muscle isotopic niches for male and female narwhals from BB (n = 28 and 26 for males and females respectively) and NHB (n = 30 and 16 for males and females respectively). Boxes indicate 95, 75, and 25 % credibility intervals and the asterisk indicates the significant difference (P < 0.05) between niches for male and female muscle in NHB.
mms12131-sup-0003-FigS3.pdfapplication/PDF301KFigure S2. (A) δ13C and δ15N biplot for narwhal skin from BB over four time periods (n = 36, 58, 12, and 24, respectively), where thin dashed lines indicate convex hulls of total niche width and standard ellipse area is indicated by thick dashed (gray = 1982–1993 and black = 2006–2011), and solid (black = 1994–2000, and gray = 2001–2005) lines. (B) box plot indicating the area (per mil2) of the isotopic niche for each time period. Boxes indicate 95, 75, and 25 % credibility intervals.
mms12131-sup-0004-SuppInfo.docWord document67KFigure S3. (A) δ13C and δ15N biplot for narwhal skin from NHB over four time periods (n = 4, 28, 9, and 25, respectively), where thin dashed lines indicate convex hulls of total niche width and standard ellipse area is indicated by thick dashed (gray = 1982–1993 and black = 2006–2011), and solid (black = 1994–2000, and gray = 2001–2005) lines. Arrows connect the centroids for progressive time periods. (B) box plot indicating the area (per mil2) of the isotopic niche for each time period. Boxes indicate 95, 75, and 25 % credibility intervals.

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