Table 1 Correlation between the distribution of nucleotide composition and RSCU (codon with G/A at 3rd position) in the mitogenomic protein-coding genes and habitat (freshwater/euryhaline and marine) of clupeoid fishes.

From: Comparative mitogenomics of Clupeoid fish provides insights into the adaptive evolution of mitochondrial oxidative phosphorylation (OXPHOS) genes and codon usage in the heterogeneous habitats

Correlation between nucleotide composition in the protein-coding genes and habitat (freshwater/euryhaline and marine) of clupeoid fishes
Nucleotide position				T-1		C-1		A-1		G-1		T-2		C-2		A-2		G-2		T-3		C-3		A-3		G-3
All species except Engraulidae
Point-Biserial Correlation	Correlation Coefficient (r)^a			−0.04		0.08		0.43		−0.56		−0.30		0.22		0.31		−0.29		−0.18		−0.04		0.53		−0.57
Point-Biserial Correlation	p value			>0.05		>0.05		<0.05		<0.01		>0.05		>0.05		>0.05		>0.05		>0.05		>0.05		<0.03		<0.01
Chi square test (Crosstab analysis)	X-squared (χ2)^b			2.4		6.0		13.6		13.5		3.4		4.6		13.5		8.2		0.2		6.2		51.1		55.0
Chi square test (Crosstab analysis)	p value			>0.05		>0.05		<0.001		<0.001		>0.05		>0.05		<0.001		0.04		>0.05		>0.05		<0.001		<0.001
All species in Engraulidae
Point-Biserial Correlation	Correlation Coefficient (r)^a			0.51		−0.31		0.61		−0.80		0.02		−0.32		0.38		−0.17		0.21		−0.51		0.83		−0.89
Point-Biserial Correlation	p value			>0.05		>0.05		<0.05		<0.01		>0.05		>0.05		>0.05		>0.05		>0.05		>0.05		<0.01		<0.001
Chi square test (Crosstab analysis)	X-squared (χ2)^b			2.7		3.8		5.9		4.3		5.0		1.3		0.5		2.5		1.7		1.7		8.2		7.8
Chi square test (Crosstab analysis)	p value			>0.05		>0.05		>0.05		>0.05		>0.05		>0.05		>0.05		>0.05		>0.05		>0.05		<0.05		<0.05
Correlation between RSCU in the protein-coding genes (codon with G/A at 3rd position) and habitat (freshwater/euryhaline and marine) of clupeoid fishes
All species except Engraulidae
Codon with G/A at 3rd position		Leu				Met		Val		Ser		Pro		Thr		Ala		Gln		Lys		Glu		Trp		Gly
Codon with G/A at 3rd position		TTA	TTG	CTA	CTG	ATA	ATG	GTA	GTG	TCA	TCG	CCA	CCG	ACA	ACG	GCA	GCG	CAA	CAG	AAA	AAG	GAA	GAG	TGA	TGG	GGA	GGG
Point-Biserial Correlation	Correlation Coefficient (r)^c	0.05	−0.58	0.70	−0.51	0.48	−0.48	0.55	−0.35	0.45	−0.67	0.59	−0.75	0.57	−0.55	0.37	−0.62	0.65	−0.65	0.64	−0.64	0.64	−0.64	0.54	−0.54	0.53	−0.48
Point-Biserial Correlation	p value	>0.01	<0.001	<0.0001	<0.01	<0.01	<0.01	<0.01	>0.01	<0.01	<0.001	<0.001	<0.0001	<0.01	<0.01	>0.01	>0.01	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.01	<0.01	<0.01	<0.01
Chi square test (Crosstab analysis)	X-squared (χ2)^d	11.2	28.2	25.6	28.6	34.9	34.5	26.3	19.4	25.8	33.3	18.5	24.3	27.8	33.0	12.8	30.7	32.6	37.0	39.9	39.5	24.6	26.0	22.3	21.3	27.0	22.6
Chi square test (Crosstab analysis)	p value	<0.01	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
All species in Engraulidae
Codon with G/A at 3rd position		Leu				Met		Val		Ser		Pro		Thr		Ala		Gln		Lys		Glu		Trp		Gly
Codon with G/A at 3rd position		TTA	TTG	CTA	CTG	ATA	ATG	GTA	GTG	TCA	TCG	CCA	CCG	ACA	ACG	GCA	GCG	CAA	CAG	AAA	AAG	GAA	GAG	TGA	TGG	GGA	GGG
Point-Biserial Correlation	Correlation Coefficient (r)^c	0.32	−0.76	0.83	−0.70	0.68	−0.68	0.82	−0.46	0.70	−0.85	0.73	−0.86	0.78	−0.68	0.56	−0.80	0.83	−0.83	0.82	−0.82	0.80	−0.80	0.76	−0.76	0.70	−0.66
Point-Biserial Correlation	p value	>0.05	<0.001	<0.001	<0.01	<0.01	<0.01	<0.001	>0.05	<0.01	<0.001	<0.001	<0.001	<0.001	<0.01	<0.05	<0.01	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.01	<0.001
Chi-square test (Crosstab analysis)	X-squared (χ2)^d	1.2	3.0	5.4	1.8	3.5	2.4	3.2	2.2	1.3	4.4	7.9	6.5	7.8	8.3	8.3	3.8	7.3	8.3	9.9	11.3	6.0	6.5	6.2	8.7	6.0	8
Chi-square test (Crosstab analysis)	p value	>0.05	>0.05	>0.05	>0.05	>0.05	>0.05	>0.05	>0.05	>0.05	>0.05	<0.05	>0.05	<0.05	<0.05	<0.05	>0.05	<0.05	<0.05	<0.05	<0.05	>0.05	>0.05	>0.05	<0.05	>0.05	<0.05

^aCalculated using Point-Biserial correlation analysis of the percentage of nucleotides in the concatenated protein-coding genes of clupeoid fishes with its habitat (freshwater/euryhaline and marine).
^bChi-square test in Crosstab analysis for association of the percentage of nucleotides in the concatenated protein-coding genes of clupeoid fishes with its habitat (freshwater/euryhaline and marine).
^cCalculated using Point-Biserial correlation analysis of RSCU (codon with G/A at 3rd position) in the concatenated protein-coding genes of clupeoid fishes with its habitat (freshwater/euryhaline and marine).
^dChi-square test in Crosstab analysis for association of the RSCU (codon with G/A at 3rd position) in the concatenated protein-coding genes of clupeoid fishes with its habitat (freshwater/euryhaline and marine).

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Table 1 Correlation between the distribution of nucleotide composition and RSCU (codon with G/A at 3rd position) in the mitogenomic protein-coding genes and habitat (freshwater/euryhaline and marine) of clupeoid fishes.

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