Table 1.

Information regarding the Ostreococcus strains used in this study.

Strain name	OTTH595	BL_82-7_clonal	Eum16BBL_clonal	PROSOPE_44_clonal
#RCC	745	789	809	802
Clade 1	C	D	B	A
Clade 2	OI		OII	OI
Latitude 3	+43° 24′	+41° 23′	+21° 2′	+36° 29′
Longitude 3	+3° 36′	+2° 10′	−31° 8′	+13° 19′
Depth (m)	Surface	Surface	105	65
Region	Thau lagoon, France	Barcelona harbour, Spain	Tropical Atlantic Ocean	Sicily channel, Italy
Trophic level	Meso/eutrophic	Mesotrophic	Oligotrophic	Oligotrophic

¹According to refs 24, 49.

²According to refs 24, 49.

³Localisation on a map in Supplementary Figure 1.