Phylogenetics and Biogeography of Southern Hemisphere Flora
Summary
The flora of the Southern Hemisphere exhibits a complex evolutionary tapestry shaped by the breakup of Gondwana, repeated climatic oscillations and dynamic dispersal pathways. Molecular phylogenetics, drawing on plastid and nuclear markers, has elucidated deep splits that correspond to continental fragmentation in the Cretaceous and subsequent radiations in Australasia, South America and sub‐Antarctic archipelagos. Divergence time estimation situates major lineages within the Cenozoic, often coinciding with global cooling and mountain building. Biogeographical reconstructions reveal both vicariant patterns and episodes of long-distance dispersal across oceanic barriers, whereas signals of hybridisation and introgression underscore the role of reticulate evolution in some clades. This integrative framework bridges taxonomic sampling, statistical modelling of ancestral ranges and ecological niche shifts and underpins conservation strategies for endemic species in the face of climate change.
Research from Nature Portfolio
No recent Nature Portfolio content available.
Phylogenetics and Biogeography of Southern Hemisphere Flora publication trend
The graph below shows the total number of articles in phylogenetics and biogeography of southern hemisphere flora across all publications each year (not limited to Nature Index journals).
Technical terms
Vicariance: Divergence of lineages due to the geographical splitting of habitats, often by tectonic events.
Long-distance dispersal: Movement of propagules across significant geographical barriers, leading to colonisation of new regions.
Plastid genome: The circular DNA contained within plant plastids, commonly used in phylogenetic studies for its maternal inheritance and conserved structure.
Internal transcribed spacer (ITS): A nuclear ribosomal DNA region frequently employed in plant phylogenetics for its high variability among closely related species.
Divergence time estimation: Statistical methods that use molecular data to infer the timing of evolutionary splits, often calibrated against fossil or geological records.
Introgression: Incorporation of genetic material from one lineage into another via hybridisation and backcrossing, producing mixed ancestry signals.
Dispersal-Extinction-Cladogenesis (DEC) model: A biogeographical framework that estimates ancestral ranges by modelling geographic range evolution through dispersal and local extinction events.
References
- Phylogenetics, diversification, and biogeography of Azorella (Apiaceae), with a special focus on the Australasian clades. Brittonia (2025).
- Molecular evidence for hybridization in the aquatic plant Limosella on sub-Antarctic Marion Island. Antarctic Science (2021).
- Species delimitation and phylogeny of a New Zealand plant species radiation. BMC Ecology and Evolution (2009).
- The migration and evolution of floras in the southern hemisphere. Bothalia (1983).
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.