Table 1.

Whole genome and codon usage statistics in the coding sequence of eight red algae

Species	Genome Size (Mb)	Number of CDS	Number of CDS (after filtering)	GC-Content	GC3s (± SD)	GC3 (± SD)	Nc (± SD)	Fop (± SD)	$\widehat{s}$
C. merolae	16.55	4803	4713	0.550	0.581 ± 0.046	0.594 ± 0.045	55.29 ± 3.39	0.470 ± 0.032	0.61
G. sulphuraria	13.71	7174	5960	0.379	0.313 ± 0.049	0.337 ± 0.047	49.81 ± 4.26	0.367 ± 0.037	0.97
C. yangmingshanensis	12.07	5185	5174	0.546	0.554 ± 0.048	0.569 ± 0.047	55.88 ± 3.41	0.447 ± 0.034	0.39
P. purpureum	22.19	9898	9611	0.559	0.635 ± 0.073	0.648 ± 0.070	51.54 ± 5.32	0.466 ± 0.038	1.21
C. crispus	104.8	9607	7133	0.529	0.585 ± 0.119	0.599 ± 0.115	52.98 ± 7.41	0.440 ± 0.050	1.48
G. chorda	92.18	10,813	10,021	0.493	0.504 ± 0.087	0.521 ± 0.084	55.29 ± 5.17	0.444 ± 0.046	0.68
G. domingensis	77.95	11,532	10,869	0.497	0.505 ± 0.099	0.520 ± 0.095	54.72 ± 5.62	0.444 ± 0.056	0.77
P. umbilicalis	87.7	13,332	12,044	0.658	0.816 ± 0.084	0.820 ± 0.082	40.27 ± 6.06	0.495 ± 0.045	1.42

Mb represents megabases, CDS represents coding sequence, GC3s represents the guanine + cytosine content of the silent 3rd codon position, Nc represents the effective number of codons, Fop represents the frequency of optimal codons, Ŝ represents the selection strength of codon usage bias. Genome size (Mb), number of CDS, and GC-content were all taken from the NCBI database(https://www.ncbi.nlm.nih.gov/). Number of CDS after filtering is the final number of CDS that meets all filtering criteria