A Constructal Law interpretation of species variability: Insights from microalgae

Area of Science:

• Physics and Biology
• Evolutionary Biology
• Systems Biology

Background:

• The Constructal Law offers a physical framework for understanding evolution as structural reorganization facilitating flows.
• Living systems integrate metabolic, regulatory, and informational networks for environmental adaptation.
• Microalgae are ideal models for studying evolutionary principles due to their rapid generation times and diversity.

Purpose of the Study:

• To reanalyze experimental data on three microalgae species through the lens of constructal design.
• To interpret evolutionary, physiological, metabolic, morphological, and genomic responses using constructal principles.
• To link biological natural selection to physical principles for a novel framework of adaptive potential.

Main Methods:

• Reanalysis of published experimental data from Phaeodactylum tricornutum, Emiliania huxleyi, and Picochlorum species.
• Interpretation of evolutionary and physiological responses through the framework of constructal design.
• Examination of metabolic, morphological, and genomic data for evidence of flow-oriented reorganization.

Main Results:

• Phaeodactylum tricornutum showed metabolic reorganization (respiration, TCA cycle, lipid metabolism) enhancing carbon, energy, and information flow under elevated CO2 and warming.
• Emiliania huxleyi exhibited cell size and calcification changes under acidification, demonstrating trade-offs in energy and material flow.
• Picochlorum displayed genomic plasticity (gene gain/loss, HGT) as alternative routes for metabolic flux, highlighting the genome as a flow network.

Conclusions:

• Adaptive responses in microalgae involve reorganization of internal and external flows, aligning with the Constructal Law.
• The Constructal Law provides a unifying physical principle for understanding evolutionary adaptation and species variability.
• This integrative perspective enhances our understanding of microalgal adaptive potential and links evolution to fundamental physical laws.