What the study found
Climate-driven movement of plant ranges can help maintain local species richness in some regions, but it is unlikely to prevent many global plant extinctions.
Why the authors say this matters
The authors conclude that conservation should focus on protecting climate change refugia, expanding ex situ conservation such as seed banks and botanic gardens, and anticipating changes in community composition and ecosystem functioning. They also suggest that in high-latitude regions, improving habitat connectivity, reducing human-made barriers, and in some cases assisting species movement may help maintain local biodiversity and ecosystem stability.
What the researchers tested
The researchers used the BioShifts database of observed plant range shifts, with 14,488 records across 6,579 plant species, to model species-specific range shift velocities. They combined 6.8 million plant occurrence records, an ensemble of two habitat models, and climate projections from 10 global circulation models to map current and future suitable habitats at 8 × 8 km resolution for each species under four greenhouse-gas emissions scenarios for 2081 to 2100.
What worked and what didn't
Across scenarios, 7% to 16% of modeled plant species were projected to lose more than 90% of their range, which the study identifies as high extinction risk. Most of these losses, about 70% to 80%, were due to suitable habitats disappearing from climate change rather than dispersal limits, while range shifts were expected to increase local species richness over 28% of Earth's land surface and maintain averaged richness in the tropics and subtropics, but not in regions north of 50°N.
What to keep in mind
The study covers 18% of known vascular plant species, so it is not a complete survey of all plants. The abstract does not describe additional limitations beyond the modeled scope and scenario coverage.
Key points
- The study projects that 7% to 16% of modeled plant species may lose more than 90% of their range.
- Most projected range loss is attributed to climate-driven habitat disappearance, not dispersal limits.
- Range shifts are expected to increase local species richness over 28% of Earth's land surface.
- Average richness is projected to remain stable in the tropics and subtropics, but not north of 50°N.
- The authors suggest climate refugia, seed banks, and botanic gardens as important conservation responses.
Disclosure
- Research title:
- Plant range shifts may support local diversity but not prevent extinctions
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