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Identifying the multiple drivers of cactus diversification.

Jamie B Thompson1,2, Tania Hernández-Hernández3, Georgia Keeling4

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This summary is machine-generated.

Machine learning and phylogenetic modeling reveal five key factors driving cactus (Cactaceae) diversification. Moderate climates, not extreme conditions, promote cactus evolution and diversity.

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Area of Science:

  • Evolutionary biology
  • Plant sciences
  • Ecology

Background:

  • Angiosperm (flowering plant) lineage diversification is complex and not fully understood.
  • Identifying simple drivers of diversification is challenging due to extraordinary diversity and distribution patterns.

Purpose of the Study:

  • To identify key abiotic and biotic variables influencing the diversification of the cactus family (Cactaceae).
  • To investigate the complex interactions between environmental factors and plant evolution.

Main Methods:

  • Reconstruction of a comprehensive cactus phylogeny.
  • Compilation of a dataset including 39 abiotic and biotic variables.
  • Application of machine learning and phylogenetic modeling, including state-dependent diversification models.

Main Results:

  • Five variables significantly shape cactus diversification: diurnal air temperature range, soil sand content, plant size, isothermality, and geographic range size.
  • Optimal conditions for abiotic variables were intermediate, suggesting moderate climates promote diversification.
  • Plant size and temperature range were identified as the most critical factors.

Conclusions:

  • Moderate environmental conditions are crucial for cactus diversification.
  • Understanding complex interactions between variables is essential for explaining angiosperm evolution.
  • This study provides insights into the primary drivers of cactus family evolution.