Mosaic evolution in hominin phylogeny: meanings, implications, and explanations

Area of Science:

• Paleoanthropology
• Evolutionary Biology
• Human Evolution

Background:

• The term "mosaic" is increasingly used in paleoanthropological literature.
• Existing uses of "mosaic" lack a clear, unified definition.
• This ambiguity hinders precise scientific communication in human evolution studies.

Purpose of the Study:

• To classify the different meanings of "mosaic" in the context of human evolution.
• To propose a framework for a more consistent application of the mosaic concept.
• To enhance the interpretation of evolutionary patterns in human lineage.

Main Methods:

• Literature review and conceptual analysis of "mosaic" in paleoanthropology.
• Development of a three-part classification system for mosaic evolution.
• Argument for a macro-evolutionary interpretation of mosaic patterns.

Main Results:

• Identified three distinct meanings of "mosaic" in human evolution: 1) morphological instability during phylogeny, 2) multiple evolutionary trajectories for adaptive traits, and 3) traits as complex mosaics of sub-traits.
• Proposed that these mosaic patterns necessitate a macro-evolutionary framework.
• Highlighted the interplay between selective pressures and cladogenesis (speciation events).

Conclusions:

• A clear classification of "mosaic" concepts is crucial for advancing human evolution research.
• Macro-evolutionary processes, including ecological instability and dispersal, drive mosaic patterns.
• Integrating cladogenetics and selective pressures offers a robust interpretation of human evolutionary history.