Macroevolutionary Patterns of Flowering Plant Speciation and Extinction.

Area of Science:

• Evolutionary Biology
• Plant Science
• Ecology

Background:

• Species diversity in flowering plants is unevenly distributed across lineages.
• The drivers of this patchy diversity pattern have perplexed plant biologists for two decades.

Purpose of the Study:

• To review current understanding of evolutionary transitions influencing speciation and extinction in flowering plants.
• To highlight factors that unexpectedly shape plant diversification rates.

Main Methods:

• Literature review of recent studies on plant speciation and extinction.
• Analysis of factors including polyploidy, biome shifts, floral form, mating systems, dispersal, and range extent.

Main Results:

• Ploidy changes, biome transitions (tropical/nontropical), and floral form shifts are key drivers of speciation and extinction.
• Mating systems and dispersal are less influential than previously thought, often requiring range shifts to impact diversification.
• Range extent is a significant correlate of speciation and influences extinction risk.

Conclusions:

• Evolutionary transitions, particularly polyploidy and range shifts, are critical for understanding plant diversification.
• Past diversification patterns can predict current extinction risks, offering a new direction for conservation prioritization.