Cactus Species Form Rapidly Through Flower Shape Changes, Not Size
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New research overturns a long-held biological belief about how new plant species form. A University of Reading team found that the speed of cactus flower shape evolution, not flower size or specialization, drives the rapid creation of new species. This pattern holds across both recent and ancient evolutionary history.
Facts First
- Cacti form new species at a rapid pace, contrary to their slow-growing reputation.
- Flower length showed almost no connection to speciation speed, challenging a decades-old biological belief.
- Cactus species with flowers that change shape most rapidly are more likely to branch off into new species.
- The pattern of rapid floral evolution was found consistently across both recent and ancient evolutionary history.
- Nearly one-third of cactus species are currently threatened with extinction.
What Happened
Researchers at the University of Reading analyzed flower length data from more than 750 cactus species. They found that flower length showed almost no connection to the speed at which new cactus species emerged. Instead, cactus species with flowers that change shape most rapidly are more likely to branch off into new species. This pattern was found consistently across both recent and ancient evolutionary history. The findings were published in Biology Letters.
Why this Matters to you
This discovery may change how scientists understand biodiversity and evolution, potentially influencing conservation strategies. For you, this means the natural world's complexity is even greater than previously thought, and the factors driving the diversity of life around us are still being uncovered. The research also highlights the vulnerability of this diversity, as nearly one-third of cactus species are threatened with extinction.
What's Next
The research team, led by Jamie Thompson, has created an Open Access database called CactEcoDB, which combines seven years of research on cactus traits, habitats, and evolutionary relationships. This resource, published in Nature Scientific Data, could enable further studies into plant evolution and conservation. Scientists may now investigate whether this pattern of rapid shape evolution driving speciation applies to other plant families beyond cacti.