Metacoder: An R package for visualization and manipulation of community taxonomic diversity data
Fig 3
Heat trees display up to four metrics in a taxonomic context and can plot multiple trees per graph.
Most graph components, such as the size and color of text, nodes, and edges, can be automatically mapped to arbitrary numbers, allowing for a quantitative representation of multiple statistics simultaneously. This graph depicts the uncertainty of OTU classifications from the TARA global oceans survey [2]. Each node represents a taxon used to classify OTUs and the edges determine where it fits in the overall taxonomic hierarchy. Node diameter is proportional to the number of OTUs classified as that taxon and edge width is proportional to the number of reads. Color represents the percent of OTUs assigned to each taxon that are somewhat similar to their closest reference sequence (>90% sequence identity). a. Metazoan diversity in detail. b. All taxonomic diversity found. Note that multiple trees are automatically created and arranged when there are multiple roots to the taxonomy.