Fig. 4: PCA clustering of the urban wastewater virome compositions from 62 cities based on the shotgun metagenomic sequence dataset reveals city-level differences without clear continental clustering. | Nature Communications

Fig. 4: PCA clustering of the urban wastewater virome compositions from 62 cities based on the shotgun metagenomic sequence dataset reveals city-level differences without clear continental clustering.

From: Unveiling the global urban virome through wastewater metagenomics

Fig. 4

The virome compostions of the biannual samples (a, b) coloured by continent and longitudinal samples (c, d) coloured by city at the family (a, c) and genus (b, d) levels. Principal components were derived from genome size adjusted read counts subjected to a CLR transformation. Arrows represent viral families or genera, with their direction showing their contribution to the principal components and their length indicating the strength of their contribution to the variance in virome composition.

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