Phylogenetic Analysis of Southeast Asian Biodiversity

Phylogenetic analysis of Southeast Asian biodiversity integrates molecular data from multiple sources—mitochondrial markers, nuclear microsatellites, ultraconserved elements and genome-wide single nucleotide polymorphisms—with geological and climatic reconstructions to elucidate the evolutionary history of flora and fauna across one of the world’s richest hotspots. The region’s complex physiography, demarcated by biogeographic breaks such as Wallace’s and Lydekker’s lines, together with Quaternary sea-level fluctuations and tectonic uplift, has driven repeated cycles of dispersal, isolation and speciation. Advances in high-throughput sequencing and computational methods now allow reconstruction of detailed phylogeographic patterns, revealing lineage diversifications that predate Pleistocene inundations in Sundaland, deep east–west genetic splits in Indo-Burma and ancient adaptive radiations in Wallacea. These insights inform conservation priorities by identifying cryptic diversity, refugial areas and evolutionary significant units. An integrative framework combining genetic, ecological and geological evidence is yielding new perspectives on the tempo and mode of diversification, with broad implications for understanding speciation processes and guiding targeted management in the face of rapid habitat loss.

Research from Nature Portfolio

Recent studies have shown that Late Quaternary sea-level changes and terrain evolution strongly influenced species connectivity across Sundaland. Landscape evolution and connectivity modelling identified multiple phases of drainage reorganisation that created dispersal corridors during low sea-level stands and fragmented habitats at high stands, thereby promoting bursts of diversification. In a separate line of research, the discovery of an early Oligocene treeshrew fossil, remarkably similar in morphology to the extant Ptilocercus, demonstrates deep evolutionary stasis within this lineage. Comparative morphological analysis and phylogenetic placement reveal that treeshrews have retained ancestral characters for over 34 million years, underscoring the role of stable tropical environments in preserving ancient lineages in Southeast Asia.

Phylogenetic Analysis of Southeast Asian Biodiversity publication trend

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

Technical terms

Phylogenetic analysis: The reconstruction of evolutionary relationships among taxa based on genetic or morphological characters.

Haplotype: A set of DNA variants inherited together, used to trace the history of maternal or paternal lineages.

Vicariance: The separation of populations by a geographic barrier, leading to independent evolutionary trajectories.

Ultraconserved elements (UCEs): Highly conserved genomic regions employed as molecular markers for deep-level phylogenetics.

Ecological niche modelling: A computational approach for predicting a species’ potential distribution using environmental variables and occurrence records.

References

1. Quaternary landscape dynamics boosted species dispersal across Southeast Asia. Communications Earth & Environment (2021).
2. An early Oligocene fossil demonstrates treeshrews are slowly evolving “living fossils”. Scientific Reports (2016).
3. East‒West genetic differentiation across the Indo-Burma hotspot: evidence from two closely related dioecious figs. BMC Plant Biology (2023).
4. Opening the door to greater phylogeographic inference in Southeast Asia: Comparative genomic study of five codistributed rainforest bird species using target capture and historical DNA. Ecology and Evolution (2020).