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Biodiversity Crisis: Species Are Disappearing 100–1,000 Times Faster Than Natural Rates
- The biodiversity crisis refers to the accelerated loss of species, habitats, and genetic diversity due to human activities.
- Unlike natural extinction events, which occur over millennia, today's rates are extraordinary:
- Current extinction rate: 100–1,000 times higher than the natural background rate.
- At-risk species: Up to one million species are at risk of extinction in the coming decades.
Measuring Loss: Scientists Use Richness, Evenness, and Long-Term Monitoring
- Biodiversity metrics: richness and evenness
- Scientists measure biodiversity using two main metrics:
- Species richness: The total number of species in a given area.
- Species evenness: The distribution of individuals among those species.
- Scientists measure biodiversity using two main metrics:
Example
- A coral reef with 500 fish species has high richness.
- If most fish belong to one species, evenness is low.
- Long-term monitoring
- Long-term studies track changes in species populations and ecosystem health over time.
Example
- Arctic fox populations are monitored annually to assess the impacts of climate change and competition with red foxes.
- Amphibian populations in tropical rainforests are tracked to understand the effects of habitat loss and disease.
Note
- Long-term monitoring allows scientists to identify patterns and potential causes of biodiversity loss, such as climate change, habitat destruction, and invasive species.
Global Evidence: IPBES and IUCN Data Confirm Accelerating Biodiversity Decline
- The IPBES report
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- A4.2.5 Evidence for a biodiversity crisis
- A4.2.6 Causes of the current biodiversity crisis
- A4.2.7 Need for several approaches to conservation of biodiversity
- A4.2.8 Evolutionarily distinct and globally endangered species in conservation prioritization