Long-term patterns of an interconnected core marine microbiota

Table 4 Core associations within and between taxonomic domains and size fractions

Network	Association type^a	# Associations
Core network	Total	1411
	Bacteria–Bacteria	767 (54%)
	Bacteria–Protist	433 (31%)
	Protist–Protist	161 (11%)
	Environmental factor–Bacteria	36 (3%)
	Environmental factor–Protist	14 (1%)
Picoplankton subnetwork	Total	378
	Bacteria–Bacteria	241 (64%)
	Bacteria–Protist	94 (25%)
	Protist–Protist	31 (8%)
	Environmental factor–Bacteria	12 (3%
	Environmental factor–Protist	0 (0%)
Nanoplankton subnetwork	Total	791
	Bacteria–Bacteria	394 (50%)
	Bacteria–Protist	246 (31%)
	Protist–Protist	113 (14%)
	Environmental factor–Bacteria	24 (3%)
	Environmental factor–Protist	14 (2%)

^a “Bacteria–Bacteria” indicates associations between two bacterial OTUs. “Protist–Protist” are associations between two unicellular eukaryotes and “Bacteria–Protist” are associations between one eukaryote and one bacterial OTU. “Environmental factor–Protist” and “Environmental factor–Bacteria” are associations between an environmental factor and a eukaryotic or bacterial OTU

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