Table 1.

18S rRNA gene amplicon sequencing statistics.

Sample	Count	OTU1
TOTAL sequences	196,0272
Mean length	410 bp
TOTAL unique OTUs		2331
5 m 0.2–1.6 μm	4679	463
5 m >1.6 μm	26,127	639
32 m 0.2–1.6 μm	6760	620
32 m >1.6 μm	12,943	946
70 m 0.2–1.6 μm	2036	47
70 m >1.6 μm	15,564	462
110 m 0.2–1.6 μm	8097	205
110 m >1.6 μm	14,868	440
200 m 0.2–1.6 μm	5633	270
200 m >1.6 μm	13,388	504
320 m 0.2–1.6 μm	7148	692
320 m >1.6 μm	9562	382
1000 m 0.2–1.6 μm	10,622	310
1000 m >1.6 μm	16,689	660

¹Observed number of operational taxonomic units (>97% nucleotide similarity).

²Total sequences before quality filtering.