Table 1.

Summary of ancient Adélie penguin sequence reads aligned to nuclear and mitochondrial reference genomes. (Average values of 56 ancient libraries are shown, with standard deviations in parentheses. All values except for last column were calculated after removal of duplicates from mapped read pools.)

reference genome	number of aligned reads, millions	per cent endogenous reads aligned	length of aligned reads, bp	average coverage depth	number of genome positions covered, ≥1×	number of variant sites	duplication, % of original aligned read pool
nuclear	2.58 (2.63)	16.77 (17.27)	56.34 (11.21)	0.136 (0.141)	123 755 026 (117 895 958)	13 883 (26 877)	4.74 (2.85)
mitochondrial	0.01 (0.01)	0.06 (0.06)	58.23 (11.90)	33.39 (37.18)	16 104 (3649)	38.09 (20.41)	20.13 (16.46)