Table 1.

Sampling information and number of reads for each sample before and after filtering by mean quality for the 14 transcriptomes.

Species	Code Name	Sex	River	City	Country	GPS		Number of raw reads	Number of reads after filtering
Echinogamarus berilloni	EGSF	Female	Saucats	Saucats	France	44°39′34″N	0°34′25″W	80 482 966	80 277 434
Echinogamarus berilloni	EGSM	Male	Saucats	Saucats	France	44°39′34″N	0°34′25″W	90 372 154	90 118 242
Echinogammarus marinus	EGUF	Female	sea coast	Portsmouth	UK	50°47′41″N	1°01′50″W	85 032 246	84 652 454
Echinogammarus marinus	EGUM	Male	sea coast	Portsmouth	UK	50°47′41″N	1°01′50″W	70 768 994	70 540 528
Gammarus fossarum A*	GFAF	Female	Seebach	Fellering	France	47°53′31″N	6°58′53″E	81 959 830	81 543 116
Gammarus fossarum A*	GFAM	Male	Seebach	Fellering	France	47°53′31″N	6°58′53″E	95 167 986	94 695 372
Gammarus fossarum B*	GFBF	Female	Pollon	Saint-Maurice-de-Rémens	France	45°57′21″N	5°15′44″E	96 361 300	96 093 396
Gammarus fossarum B*	GFBM	Male	Pollon	Saint-Maurice-de-Rémens	France	45°57′21″N	5°15′44″E	85 125 996	84 758 816
Gammarus fossarum C*	GFCF	Female	Pollon	Saint-Maurice-de-Rémens	France	45°57′21″N	5°15′44″E	78 459 708	77 977 148
Gammarus fossarum C*	GFCM	Male	Pollon	Saint-Maurice-de-Rémens	France	45°57′21″N	5°15′44″E	75 598 166	75 407 534
Gammarus pulex	GPCF	Female	Pollon	Saint-Maurice-de-Rémens	France	45°57′21″N	5°15′44″E	84 202 086	83 965 920
Gammarus pulex	GPCM	Male	Pollon	Saint-Maurice-de-Rémens	France	45°57′21″N	5°15′44″E	89 235 492	89 025 410
Gammarus wautieri	GWF	Female	Galaveyson	Le Grand Serre	France	45°16′27″N	5°07′08″E	80 192 262	79 695 588
Gammarus wautieri	GWM	Male	Galaveyson	Le Grand Serre	France	45°16′27″N	5°07′08″E	63 959 618	63 638 482

*Müller type.