Problems with supertrees based on the subtree prune-and-regraft distance, with comments on majority rule supertrees

Area of Science:

• Phylogenetic analysis
• Computational biology
• Systematics

Background:

• Examines a novel supertree construction method minimizing subtree prune-and-regraft (SPR) distances.
• Highlights potential issues where supertrees may represent minority or unsupported clades.
• Compares this method to majority rule supertrees, which are clade-based.

Discussion:

• Discusses the limitations of SPR-based supertrees, drawing parallels to "matrix representation with parsimony" problems.
• Questions the interpretation of "majority rule supertrees" as always reflecting a true majority.
• Explores the relationship between Robinson-Foulds (RF) distances and supertree consensus.

Key Insights:

• SPR-based supertrees can produce results contradicted by the majority of input trees.
• Majority rule supertrees avoid representing unsupported or minority clades.
• The definition of "majority" in supertree construction can be ambiguous, potentially leading to contradictory outcomes.

Outlook:

• Further research is needed to clarify the definition and interpretation of majority rule in supertree construction.
• Investigating alternative supertree methods that robustly represent phylogenetic signal is crucial.
• Developing methods to resolve ambiguities in supertree consensus will enhance their reliability in systematic studies.