Evolutionary distinctiveness, threat status, and ecological oddity in primates

Area of Science:

• Conservation Biology
• Evolutionary Biology
• Primate Ecology

Background:

• The Evolutionarily Distinct and Globally Endangered (EDGE) program ranks species for conservation using threat and phylogenetic isolation.
• Assessing whether EDGE-ranked species represent the broader diversity within their clade is crucial for effective conservation prioritization.

Purpose of the Study:

• To test if primates with high EDGE scores represent the collective biological diversity of the primate clade.
• To evaluate the utility of the EDGE metric in capturing a broad range of ecological and morphological traits.

Main Methods:

• Analysis of ecological, reproductive, and morphological traits for all 233 primate species.
• Correlation analysis between EDGE scores and deviations from mean trait values (body mass, diet, terrestriality, home range size).

Main Results:

• EDGE scores were significantly correlated with the deviance from the mean of 20 different biological variables (mean r = 0.14, p < 1.7 x 10^-14).
• High-scoring primates exhibited unique characteristics but not necessarily more ancestral traits than expected.
• Sets of high-scoring primate species collectively captured a broader-than-expected range of the clade's biology.

Conclusions:

• The EDGE metric appears effective in identifying species that represent a wide spectrum of biological diversity within a clade.
• The findings support the EDGE metric's utility for prioritizing global biodiversity conservation efforts.
• Similar patterns may apply to other taxonomic groups, broadening the applicability of the EDGE conservation approach.