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. 2021 Jul 6;12:4160. doi: 10.1038/s41467-021-24299-y

Fig. 4. Biogeography of diazotrophs in surface waters using metagenomes obtained from different size-fractionated samples.

Fig. 4

The percentage of diazotrophs in the bacterioplankton community was estimated by the ratio of metagenomic read abundance between the marker genes nifH and recA. a Biogeography. The bubble size varies according to the percentage of diazotrophs, while red crosses indicate absence (i.e., no detection of nifH reads). b Latitudinal abundance gradient. The blue lines correspond to generalized additive model smoothings. c Ocean distribution. MS Mediterranean Sea, IO Indian Ocean, SAO South Atlantic Ocean, SO Southern Ocean, SPO South Pacific Ocean, NPO North Pacific Ocean, NAO North Atlantic Ocean, AO Arctic Ocean. Boxplots depict the 25–75% quantile range of the dataset without zeros (the corresponding biologically independent seawater samples are indicated in the plot), with the center line depicting the median (50% quantile); whiskers encompass data points within 1.5× the interquartile range. Source data are provided as a Source data file.