ArticleAntonie van Leeuwenhoek2026
Genetic diversity of marine copepods along the Tamil Nadu and Pondicherry, southeast coast of India.
Article in Antonie van Leeuwenhoek, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The present study investigated the phylogenetic relationships among marine copepod populations in the coastal areas of Tamil Nadu and Pondicherry regions, India. Two molecular markers-a nuclear 18S rRNA gene and a mitochondrial COI gene-were evaluated for their accuracy and taxonomic resolution in classifying species within the subclass Copepoda. Phylogenetic analyses were performed on 21 copepod isolates, comprising 12 sequences derived from 18S rRNA and 9 from the COI gene. The findings clearly delineated evolutionary lineages corresponding to three major orders: Calanoida, Cyclopoida, and Harpacticoida. In the 18S rRNA, the overall mean genetic diversity (d) was slightly higher. The gamma distribution rate (Φ) showed site-specific variation in both of the markers. Furthermore, segregating sites and the total number of recombination frequency were higher in the COI gene compared to 18S rRNA. The analysis of nucleotide composition showed that the strongest (triple) G+C hydrogen-bond interactions were more abundant in the 18S rRNA sequences than in COI. Our findings demonstrate that both 18S rRNA and COI serve as reliable and informative markers for resolving cladogenetic patterns and evolutionary relationships among copepod taxa. Among various genetic diversity tools, their combined application enhances the accuracy of phylogenetic reconstruction and supports their use in integrative taxonomic studies of marine copepods.
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