Table 1.

Taxonomic breakdown of viral marker genes

Viruses		Identified	Used in PLS regressiona
NCLDVs	Mimiviridae	2,923	1,148
	Phycodnaviridae	348	99
	Iridoviridae	198	59
	Other NCLDVsb	17	3
	Total	3,486	1,309
RNA viruses	Picornavirales (ssRNA+)	325	80
	Partitiviridae (dsRNA)	131	22
	Narnaviridae (ssRNA+)	95	6
	Other families	289	53
	Unclassified	78	9
	RNA viruses	57	10
	Total	975	180
ssDNA viruses	Circoviridae	201	22
	Geminiviridae	4	0
	Nanoviridae	4	0
	Unclassified	39	2
	ssDNA viruses	51	10
	Total	299	34
All		4,760	1,523

^aThe marker genes had to occur in at least five samples and harbor a Spearman correlation coefficient > |0.2| with carbon export efficiency.

^bThere was no unclassified NCLDV.