Table 2 Spearman’s correlation coefficient (r) between gene frequency and three environmental variables

From: Diversification and niche adaptations of Nitrospina-like bacteria in the polyextreme interfaces of Red Sea brines

Gene a , b

Parameter

 

Dissolved O 2

Temperature

Salinity

nxrA (low-affinity type)

−0.42**

−0.50**

−0.30

All nxrA (high-affinity type)c

−0.58***

−0.33*

0.14

HNOB-only nxrA (high-affinity type)d

−0.66***

−0.19

0.17

narG

−0.46**

−0.53***

−0.25

amoA

0.01

−0.57***

0.29

  1. Abbreviations: HNOB, high-affinity nitrite-oxidizing bacteria.
  2. *P<0.05; **P<0.01; ***P<0.001.
  3. aGene frequencies are based on data presented in Figure 5c.
  4. bSee Figure 5b for phylogeny of nxrA genes.
  5. cAlso includes nxrA genes from anaerobic ammonia-oxidizing (anammox) bacteria.
  6. dExcludes anammox-like nxrA genes.
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