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Diego Pol1, Mark A Norell1

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The Manhattan stratigraphic measure assesses fossil record and phylogenetic hypothesis congruence. A modified index (MSM*) improves accuracy by accounting for ghost lineages, enhancing temporal data analysis.

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Area of Science:

  • Paleontology
  • Phylogenetics
  • Biostratigraphy

Background:

  • The Manhattan stratigraphic measure was developed to quantify congruence between fossil data and phylogenetic trees.
  • This index relies on a Sankoff character reflecting taxon ages, calculated similarly to the consistency index.

Purpose of the Study:

  • To analyze limitations of the Manhattan stratigraphic measure when faced with conflicting temporal data.
  • To propose and validate a modified index (MSM*) that addresses these limitations.

Main Methods:

  • Analysis of sample cases with conflicting stratigraphic and topological temporal information.
  • Modification of the step matrix used in the Manhattan stratigraphic measure.
  • Development of the modified index, MSM*, focusing on ghost lineage quantification.

Main Results:

  • The original Manhattan stratigraphic measure can be insensitive to increasing conflicts between temporal data sources.
  • The modified index, MSM*, demonstrates improved accuracy in resolving temporal discrepancies.
  • MSM* effectively incorporates the measurement of ghost lineages to refine congruence assessment.

Conclusions:

  • The MSM* provides a more robust measure of congruence between fossil and phylogenetic temporal information.
  • Accounting for ghost lineages is crucial for accurate temporal data reconciliation in phylogenetics.
  • The modified index offers a valuable tool for paleontological and phylogenetic research.