Phylogenetic Systematics of Freshwater Fish

Phylogenetic systematics of freshwater fish integrates morphological, molecular and genomic data to reconstruct the evolutionary history of diverse lineages inhabiting rivers, lakes and wetlands across the globe. By delineating monophyletic groups, researchers have clarified relationships within major orders such as Cypriniformes and Siluriformes, revealing patterns of ancient radiations linked to palaeogeographical events. Advances in phylogenomic techniques now permit the analysis of hundreds of loci simultaneously, resolving deep and shallow nodes with unprecedented confidence. This refined framework underpins taxonomic revisions, illuminates modes of speciation, and guides conservation prioritisation by identifying evolutionarily distinct lineages. Moreover, a better understanding of trait evolution—ranging from specialized dentition to habitat adaptation—enables predictions about resilience to environmental change and supports the sustainable management of freshwater biodiversity.

Research from Nature Portfolio

Recent studies have combined enhanced traditional faunal analyses with measures of phylogenetic distinctiveness to prioritise key taxa for conservation in Southeast Asian river basins, demonstrating that monotypic genera often represent irreplaceable components of evolutionary diversity. In parallel, complete mitochondrial genome sequencing of an endangered cyprinid has established population‐specific single‐nucleotide markers and clarified intraspecific relationships within a major genus, thereby informing germplasm protection strategies and refining genus‐level phylogeny.

Phylogenetic Systematics of Freshwater Fish publication trend

The graph below shows the total number of articles in phylogenetic systematics of freshwater fish across all publications each year (not limited to Nature Index journals).

Technical terms

Phylogenetic systematics: The discipline of reconstructing evolutionary relationships among organisms based on shared derived characters.

Monophyletic group: A set of taxa that includes an ancestral species and all its descendants.

Phylogenomics: The use of genome‐scale data to infer evolutionary relationships.

Anchored hybrid enrichment: A method that targets and sequences hundreds of conserved genomic regions across taxa for phylogenetic analysis.

Mitochondrial genome: The circular DNA molecule found in mitochondria that is widely used for inferring evolutionary relationships.

References

1. Fish diversity and selection of taxa for conservation in the Salween and Irrawaddy Rivers, Southeast Asia. Scientific Reports (2024).
2. Characterization of the mitochondrial genome of Megalobrama terminalis in the Heilong River and a clearer phylogeny of the genus Megalobrama. Scientific Reports (2019).
3. Resolving Cypriniformes relationships using an anchored enrichment approach. BMC Ecology and Evolution (2016).
4. Phylogenomics and classification of Notropis and related shiners (Cypriniformes: Leuciscidae) and the utility of exon capture on lower taxonomic groups. PeerJ (2022).
5. Assembly and phylogenetic analysis of the complete mitogenome of Devario interruptus (Teleostei, Cypriniformes, Danionidae). Mitochondrial DNA Part B (2023).