Table 3 Summary of statistical results in the present study for both thick-billed murres and northern fulmars.

MANOVA

δ¹³C, δ¹⁵N

p < 0.001***

p < 0.001***

ANOVA: ~ Year

H-Print

p = 0.001***, F_3,40 = 8.9, n = 11

p < 0.001***, F_3,52 = 6.6, n = 14

δ¹³C

p < 0.001***, F_3,40 = 18.5, n = 11

p < 0.001***, F_3,52 = 6.7, n = 14

δ¹⁵N

p = 0.01*, F_3,40 = 3.9, n = 11

p < 0.001***, F_3,52 = 7.0, n = 14

Ice Use Index

p < 0.001***, F_3,40 = 12.1, n = 11

p < 0.001***, F_3,52 = 8.8, n = 14

Volume

p < 0.07, F_3,56 = 2.5, n = 15

p = 0.5, F_3,44 = 0.7, n = 12

Energy content

p = 0.01*, F₃,₂₄ = 4.6, n = 7

—

~ Species

δ¹⁵N

p < 0.001***, t = −23.9; Mean (TBMU) = 15.6

Mean (NOFU) = 13.2

~2012 Groups

H-Print

p < 0.001***, t = −8.4; Mean (Ice) = 35.4; Mean (Open-water) = 83.0

—

Volume

p = 0.08, t = 1.9; Mean (Ice) = 203.2; Mean (Open-water) = 188.3

—

Energy content

p = 0.8, t = −0.3; Mean (Ice) = 152.6; Mean (Open-water) = 158.6

—

~Year groups

Volume

p = 0.01*, t = 2.5; Mean (Cold) = 195.2; Mean (Warm) = 184.8

—

Energy content

p = 0.002**, t = 3.3; Mean (Cold) = 140.0; Mean (Warm) = 107.2

—

~ Ice concentrations

H-Print

p < 0.001***; y = −0.55x + 99.0; R² = 28.2

p > 0.05 (Non-significant)

Ice Use Index

p < 0.001***; y = 0.03x− 2.1; R² = 32.1

p > 0.05 (Non-significant)

~Ice Use Index

δ¹⁵N

p < 0.001***; y = 0.25x + 15.6; R² = 22.4

p = 0.9 (Non-significant)

Egg volume

p = 0.009**; y = 4.9x + 188.1; R² = 13.2

p = 0.7 (Non-significant)

Egg energy content

p = 0.008**; y = 11.8x + 123.9; R² = 21.2

—

~δ¹⁵N

Egg volume

p = 0.1 (Non-significant)

p = 0.09 (Non-significant)

Egg energy content

p = 0.005**; y = 24.0x − 253.3; R² = 23.4

—

~Egg volume

Egg energy content

p = 0.024*; y = 0.81x − 25.8; R² = 15.9

—

Quadratic relationship

δ¹⁵N ~ Ice Use Index

p < 0.001***; y = −0.26 x² + 0.34x + 16.0; R² = 58.1

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