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How Phenograms and Cladograms Became Molecular Phylogenetic Trees
1Chair of Nature Conservation and Landscape Ecology, University of Freiburg, Freiburg, Germany. nina.kranke@nature.uni-freiburg.de.
Journal of the History of Biology
|August 30, 2024
Summary
Tree diagrams in biology evolved beyond theoretical conflicts. Molecular phylogenetics integrated cladistics and phenetics, showing representational practices shape scientific change.
Area of Science:
- Evolutionary biology
- History and philosophy of science
- Bioinformatics
Background:
- Tree diagrams are central to biological classification and phylogenetics.
- The "Systematist Wars" (1960s-1980s) focused on theoretical conflicts, often overlooking representational practices.
Purpose of the Study:
- To offer an alternative perspective on the Systematist Wars by analyzing representational practices.
- To re-evaluate the origins of molecular phylogenetics and its relationship with systematics.
Main Methods:
- Case study analysis of tree diagrams (phenograms and cladograms) used by numerical taxonomists and cladists.
- Historical analysis of scientific change in phylogenetics.
Main Results:
- Molecular phylogenetics emerged independently of systematics, integrating elements of cladistics and phenetics.
- The quantitative nature of molecular phylogenetics facilitated the integration of phenetic and cladistic practices.
- Phenograms and cladograms, once distinct, are now both used to represent evolutionary relationships within molecular phylogenetics.
Conclusions:
- Scientific change in phylogenetics is more complex than narratives of conflict suggest.
- Representational practices, like tree diagrams, are versatile and adaptable within different theoretical frameworks.
- The evolution of phylogenetic visualization reflects a shift from theoretical disputes to integrated quantitative approaches.
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