Prokaryotic evolution and the tree of life are two different things

Area of Science:

• Evolutionary Biology
• Microbial Genetics
• Systematics

Background:

• The concept of a universal tree of life assumes a consistent tree-like evolutionary process across all life forms.
• Traditional systematics employs a hierarchical, bifurcating model for classifying organisms.
• This tree-like assumption is well-supported in multicellular eukaryotes but not in prokaryotes.

Purpose of the Study:

• To critically evaluate the applicability of the universal tree of life model to prokaryotic evolution.
• To explore the philosophical, scientific, and epistemological implications of applying a single evolutionary model to all life.
• To advocate for alternative models that better represent prokaryotic evolutionary patterns.

Main Methods:

• Philosophical and epistemological analysis of evolutionary theory.
• Review of genomic data and its interpretation in the context of phylogenetic models.
• Comparison of evolutionary mechanisms in eukaryotes and prokaryotes.

Main Results:

• Genomic data increasingly contradicts the universal tree of life model for prokaryotes.
• The monistic, tree-like concept is becoming obsolete for describing prokaryotic evolution.
• Applying a single bifurcating scheme to prokaryotes disregards their complex, non-tree-like evolutionary patterns.

Conclusions:

• Prokaryotic evolution and the tree of life are distinct concepts that require separate consideration.
• Alternative models are necessary to accurately study prokaryotic evolution.
• A pluralistic approach is essential, recognizing the discontinuity of evolutionary processes across the prokaryote-eukaryote divide.