Phylogenetic Analysis of Helminth Parasites in Freshwater Fishes
Summary
Phylogenetic analysis of helminth parasites in freshwater fishes integrates molecular sequencing with morphological study to reconstruct evolutionary relationships among parasitic flatworms and roundworms. By targeting conserved and variable genetic markers—such as ribosomal RNA genes (28S rRNA, LSU rDNA) and mitochondrial loci (COI mtDNA)—researchers apply statistical frameworks (Bayesian inference, maximum likelihood) to infer lineage divergence, monophyly or paraphyly of parasite groups, and their co‐evolutionary histories with fish hosts. This approach resolves taxonomic ambiguities in major helminth clades (Monogenea, Trematoda, Cestoda, Nematoda), clarifies the origins and biogeographical dispersal of parasite lineages, and underpins proposals for revised subfamilial or generic classifications. Phylogenetic trees inform ecological and epidemiological studies by linking genetic lineages to host specificity, life-cycle strategies and environmental drivers in freshwater ecosystems worldwide. The resulting insights support conservation of fish biodiversity, help predict emerging parasitic threats, and guide management of aquaculture and wild stocks.
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Phylogenetic Analysis of Helminth Parasites in Freshwater Fishes publication trend
The graph below shows the total number of articles in phylogenetic analysis of helminth parasites in freshwater fishes across all publications each year (not limited to Nature Index journals).
Technical terms
Helminth parasite: A worm in the phyla Platyhelminthes or Nematoda that lives as a parasite within a host fish.
Phylogenetic analysis: The reconstruction of evolutionary relationships among organisms using genetic or morphological data.
Monogenean: A class of parasitic flatworms with a single host life cycle, typically infesting fish gills or skin.
28S rRNA gene: A region of ribosomal RNA frequently used as a molecular marker for deep‐level phylogenies.
LSU rDNA: DNA encoding the large subunit of ribosomal RNA, employed in evolutionary studies across diverse taxa.
COI mtDNA: Mitochondrial cytochrome c oxidase subunit I gene, a standard barcode for species identification and phylogeography.
Bayesian inference: A probabilistic method for estimating phylogenetic trees, integrating prior information with sequence data.
Maximum likelihood: A statistical approach to identify the tree that most likely produced the observed genetic data under an evolutionary model.
Paraphyletic: A taxon that includes a common ancestor and some, but not all, of its descendants, indicating incomplete grouping.
References
- Molecular phylogeny of Neotropical monogeneans (Platyhelminthes: Monogenea) from catfishes (Siluriformes). Parasites & Vectors (2015).
- Three New Species of Jainus (Monogenea: Dactylogyridae) Parasitizing Gills of Brazilian Freshwater Fishes Supported by Morphological and Molecular Data †. Diversity (2023).
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