Conservation Dependent Species and the IUCN Red List
The International Union for Conservation of Nature (IUCN) maintains the Red List, the world's most comprehensive inventory of the global conservation status of biological species. Within this system, certain taxa were historically classified as conservation dependent—a designation for species whose extinction risk is minimized by a particularly effective conservation program.
The Evolution of IUCN Categories
The conservation dependent category originated as part of the IUCN 1994 Categories & Criteria (version 2.3). This framework was used to evaluate taxa until 2001, when the IUCN transitioned to version 3.1 of its assessment system. Under the current 2001 system, species that would have been labeled conservation dependent are now classified as near threatened.
Despite the update, the conservation dependent label persists in the Red List for taxa that were evaluated prior to 2001 and have not yet undergone a formal re-evaluation. This creates a legacy category that remains visible in current data sets.
Current Status and Statistics
The number of species holding this legacy status has shifted over time as more taxa are re-evaluated under the modern criteria. In July 2016, the IUCN listed 238 conservation dependent species, representing 0.29% of all evaluated species at that time. This figure also included seven subspecies and five varieties.
According to the 2024.2 version of the Red List, the number of conservation dependent species has decreased to 125. Additionally, seven plant subspecies and five plant varieties continue to be listed under this category.
| Metric | July 2016 Data | 2024.2 Version |
|---|---|---|
| Conservation Dependent Species | 238 | 125 |
| Subspecies | 7 | 7 (Plant) |
| Varieties | 5 | 5 (Plant) |
Key Facts
- Legacy Status: The conservation dependent category is from the 1994 IUCN version 2.3 and is no longer used for new evaluations.
- Modern Equivalent: Taxa in this category are now considered near threatened under the 2001 (v3.1) system.
- Current Count: As of version 2024.2, there are 125 species, 7 plant subspecies, and 5 plant varieties listed as conservation dependent.
- Persistence: Species remain in this category only if they have not been re-evaluated since the 2001 system update.
Frequently Asked Questions
What does conservation dependent mean in the IUCN context?
It refers to taxa that are dependent on ongoing, effective conservation programs to prevent them from becoming endangered.
Why is this category still used if it is outdated?
It remains in the Red List for taxa evaluated before 2001 that have not yet been re-evaluated under the current version 3.1 criteria.
Which modern IUCN category replaces conservation dependent?
Under the 2001 (v3.1) system, these taxa are classified as near threatened.
How many species were conservation dependent in 2016?
In July 2016, there were 238 species, along with seven subspecies and five varieties, listed as conservation dependent.
Are there still plant varieties listed as conservation dependent?
Yes, as of the 2024.2 version of the Red List, five plant varieties are still listed under this category.