Table 1 Summary of nifH detected MAGs in the Arctic Ocean.

From: Distribution and survival strategies of endemic and cosmopolitan diazotrophs in the Arctic Ocean

Genome

Length (Mb)

Genome completeness

nifH primer compatibility

nifH cluster

nifDK, nifENB

Distribution pattern

GTDB-based taxonomy

Arc-UCYN-A2b

1.48

74.3 (99.3)a

○

I

○

Arctic-endemic

Cyanobacteria; Atelocyanobacterium thalassa

Arc-Bacterob

4.55

97.3

×nifH4

III

○

Arctic-endemic

Bacteroidota; genus Sunxiuqinia

Arc-Campylob

2.92

96.8

○

I

○

Arctic-endemic

Campylobacterota; genus Arcobacter

Arc-Alphab

3.18

97.7

○

I

○

Cosmopolitan

Proteobacteria; genus Novosphingobium

Arc-Gamma-01b

3.21

97.6

○

I

No nifK

Arctic-endemic

Proteobacteria; genus Immundisolibacter

Arc-Gamma-02b

4.14

93.9

×nifH4

I

○

Arctic-endemic

Proteobacteria; genus Psychromonas

Arc-Gamma-03b

3.74

96.4

×nifH4

I

○

Arctic-endemic

Proteobacteria; genus Oceanobacter

Arc-Gamma-04

3.77

91.8

×nifH4

I

No nifB

–

Proteobacteria; genus Motiliproteus

Arc-Myxo

3.77

84.6

×nifH1,2,3

III

No nifDK, or nifENB

–

Myxococcota; family JABWCM01

  1. Genome completeness was estimated by CheckM [23].
  2. nifH primer compatibility was examined using the existing universal nifH primers, in which nifH1,2,3, and 4 are most widely used primers.
  3. aCalculated by regarding the complete genome of the UCYN-A2 (CPSB-1, Supplementary Table S2) as 100.
  4. bMAGs were identified as diazotrophs through nif gene-based screening. Arc-Gamma-01 may be missing nifK due to a fragmented genome assembly (see text).
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