Similar but Different: Dynamic Social Network Analysis Highlights Fundamental Differences between the Fission-Fusion Societies of Two Equid Species, the Onager and Grevy's Zebra.
Authors: Rubenstein Daniel I, Sundaresan Siva R, Fischhoff Ilya R, Tantipathananandh Chayant, Berger-Wolf Tanya Y
Journal: PloS one
Summary
# Editorial Summary: Dynamic Social Network Analysis of Equid Societies Researchers from multiple institutions applied dynamic social network analysis to compare the social structures of two evolutionarily similar equid species—Grevy's zebras and wild asses (onagers)—recognising that traditional static network analyses fail to capture the temporal patterns that actually drive social behaviour. Rather than aggregating association data across entire study periods, the team tracked how individual relationships and group memberships changed over time, revealing substantial differences between the two species that would have remained invisible in conventional analyses. Grevy's zebras exhibited significantly greater modularity (tighter, more persistent subgroups), whereas wild ass populations consisted largely of solitary individuals; additionally, lactating female zebras switched between social groups far more frequently than non-lactating females or males, suggesting reproductive state directly shapes social flexibility. These findings highlight that closely related species with apparently similar social organisations may employ fundamentally different strategies for managing group membership and individual associations. For equine professionals, this research underscores the importance of considering temporal dynamics when interpreting herd behaviour, social stress responses, and reproductive influences on socialisation—particularly relevant for understanding how mares' social preferences may shift with lactation status and how individual temperament variation relates to dynamic positioning within stable groups.
Read the full abstract on PubMed
Practical Takeaways
- •Dynamic social network analysis reveals behavioural patterns invisible to standard observation methods—consider temporal factors when studying equid social structures in your own herds
- •Reproductive status significantly influences social mobility in zebras; lactating females actively change group associations, which may affect herd management strategies for breeding animals
- •Social organisation in closely related species can differ fundamentally despite superficially similar herd structures—detailed observation over time is essential to understand true social dynamics
Key Findings
- •Dynamic social network analysis reveals that Grevy's zebras exhibit greater modularity in social groupings compared to evolutionarily related wild asses (onagers)
- •Wild asses show predominantly solitary individual communities whereas Grevy's zebras form more stable group structures
- •Lactating female Grevy's zebras switch social communities more frequently than non-lactating females and males, a pattern invisible in static network analyses
- •Temporal incorporation in network analysis uncovers social dynamics missed by traditional aggregated data approaches