Phylogenetic Diversity and Biodiversity Conservation

Phylogenetic diversity measures the total evolutionary history represented by a set of species, capturing branch lengths on the tree of life rather than treating all species as equally distinct. By integrating evolutionary relationships into conservation planning, phylogenetic approaches reveal lineages whose loss would prune unique branches and erase irreplaceable genetic information. This perspective complements traditional metrics of species richness and endemism by highlighting evolutionary potential, functional resilience and the capacity of ecosystems to adapt to environmental change. Conservation frameworks that incorporate phylogenetic information can prioritise areas and taxa that safeguard deeper branches, promote functional trait diversity and maintain ecosystem services. Global patterns of phylogenetic diversity exhibit hotspots in tropical rainforests, island archipelagos and ancient stable landscapes, while rapidly diversifying clades often concentrate in arid or mountainous zones. Emerging methods—such as spatial phylogenetics, endemism-based clustering and evolutionary distinctness–extinction risk indices—enable the identification of neo- and paleo-endemism, neglected clades and conservation gaps within existing protected-area networks. In an era of escalating habitat loss, wildlife trade and climate upheaval, embedding evolutionary history within policy and action plans is critical to preserving the full breadth of biodiversity and its future adaptive capacity.

Research from Nature Portfolio

One recent study mapped global hotspots of traded phylogenetic and functional diversity across birds and mammals, revealing that tropical regions harbour the greatest concentrations of evolutionary distinct and threatened lineages in trade. The work demonstrated that trade-driven extinctions would disproportionately prune deep branches and key functional traits, underscoring the need for targeted regulation and community-based management in identified epicentres.

Another publication assessed the conservation status of jawed vertebrate evolutionary history, projecting the loss of tens of billions of years of lineage over coming centuries. By ranking species according to an evolutionary distinctness–extinction risk index, the analysis spotlighted chondrichthyans, ray-finned fishes and testudines as high priorities and highlighted families at particular risk, providing a policy-relevant baseline to catalyse action on neglected lineages.

Phylogenetic Diversity and Biodiversity Conservation publication trend

The graph below shows the total number of articles in phylogenetic diversity and biodiversity conservation across all publications each year (not limited to Nature Index journals).

Technical terms

Phylogenetic diversity (PD): The sum of branch lengths connecting a set of species on a phylogenetic tree, representing total evolutionary history.

Evolutionary distinctness (ED): A metric quantifying the unique contribution of a single species to overall phylogenetic diversity.

EDGE score: A composite index that combines evolutionary distinctness with extinction risk to prioritise species for conservation.

Phylogenetic endemism: The degree to which evolutionary history is geographically restricted, indicating areas with unique lineages.

Functional diversity (FD): The range and value distribution of ecological traits within a community, linked to ecosystem functions.

References

1. Global hotspots of traded phylogenetic and functional diversity. Nature (2023).
2. Global conservation status of the jawed vertebrate Tree of Life. Nature Communications (2024).
3. Mammals on the EDGE: Conservation Priorities Based on Threat and Phylogeny. PLOS ONE (2007).
4. Global Distribution and Conservation of Evolutionary Distinctness in Birds. Current Biology (2014).
5. Spatial phylogenetics of the native California flora. BMC Biology (2017).