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Table 1 Composition of Great tit uropygial gland secretions

From: Uropygial gland size and composition varies according to experimentally modified microbiome in Great tits

  Compound Formula PC1 PC2 PC3
A Pentadecyl octadecanoate C33H66O2 0.39 −0.11 0.54
B Hexadecyl 9-octadecenoate C34H66O2 −0.88 −0.17 0.24
C Hexadecyl octadecanoate C34H68O2 −0.29 −0.72 0.16
D Nonadecyl hexadecanoate C35H70O2 0.55 −0.14 0.56
E Unidentified C35H70O2 0.78 −0.2 0.06
F Unidentified C35H70O2 0.58 −0.51 −0.09
G Heptadecyl 9-octadecenoate C35H70O2 −0.63 0.45 0.31
H Heptadecyl octadecanoate C35H70O2 0.91 0.17 0.27
I Octadecyl 9-octadecenoate C36H70O2 −0.58 −0.41 −0.48
J Octadecyl 9-octadecenoate C36H70O2 −0.85 0.07 0.24
K Octadecyl octadecanoate C36H72O2 −0.04 0.42 −0.81
L Unidentified C37H74O2 0.87 0.2 0.16
M Unidentified C37H74O2 0.85 0.07 −0.28
N Unidentified C37H74O2 −0.7 0.49 0.23
O Unidentified C37H74O2 0.8 0.03 −0.22
P Nonadecyl 9-octadecenoate C37H72O2 −0.34 −0.79 −0.1
  1. Factor loadings of the three first principal components summarizing the variance in the chemical composition of uropygial gland secretions in breeding Great tits are shown. The first component represents 45.1% of the original variance, the second 14.9% and the third 12.8% (total 72.8%). Each letter indicates a different compound in the GC-MS profiles. Variables included in each principal component are presented in bold.