Otolith chemistry suggests population heterogeneity within a genetically homogeneous Indian scad population along Indian coast
Abstract The Indian scad, Decapterus russelli is one of the most exploited pelagic resources of India. Population genetic analyses using mitochondrial and nuclear markers indicated a lack of genetic structuring among populations from Indian waters. As this species is highly migratory, it is also imp...
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2025-01-01
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| author | Anjaly Jose Sandhya Sukumaran Neenu Raj K. Nisha Eldho Varghese S. J. Laly Satyen Kumar Panda Subal Kumar Roul P. Abdul Azeez Shoba Joe Kizhakudan A. Gopalakrishnan |
| author_facet | Anjaly Jose Sandhya Sukumaran Neenu Raj K. Nisha Eldho Varghese S. J. Laly Satyen Kumar Panda Subal Kumar Roul P. Abdul Azeez Shoba Joe Kizhakudan A. Gopalakrishnan |
| author_sort | Anjaly Jose |
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| description | Abstract The Indian scad, Decapterus russelli is one of the most exploited pelagic resources of India. Population genetic analyses using mitochondrial and nuclear markers indicated a lack of genetic structuring among populations from Indian waters. As this species is highly migratory, it is also important to establish the environmental influence on its population structure. In the present study, the whole sagittal otolith composition was analysed using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) to assess spatial distribution of D. russelli collected from 4 sites along the Indian coast. Elemental ratios (Ba/Ca, Fe/Ca, K/Ca, Mg/Ca, Na/Ca, Sr/Ca and Zn/Ca) were analysed using univariate and multivariate statistics to determine whether this chemical signature can provide insight into the adaptive patterns. All element/Ca ratios are found to be significantly different between the four sampling locations (ANOVA, p < 0.05; MANOVA, p < 0.05). Five of the element/Ca ratios were found to be significantly different when the data was analysed coastwise (ANOVA, p < 0.05; MANOVA, p < 0.05). The LDA plot also showed the spatial heterogeneity of Element/Ca ratios between the four sampling sites, but some overlaps were also observed, reflecting the migratory ability of the species. This basic information on spatial ecology is required for formulating effective management and conservation strategies for the species. |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-c8dbf16b81c8486b848f2c0ffbb609572025-01-12T12:23:38ZengNature PortfolioScientific Reports2045-23222025-01-0115111410.1038/s41598-025-85719-3Otolith chemistry suggests population heterogeneity within a genetically homogeneous Indian scad population along Indian coastAnjaly Jose0Sandhya Sukumaran1Neenu Raj2K. Nisha3Eldho Varghese4S. J. Laly5Satyen Kumar Panda6Subal Kumar Roul7P. Abdul Azeez8Shoba Joe Kizhakudan9A. Gopalakrishnan10Marine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteMarine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteMarine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteMarine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteMarine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteICAR-Central Institute of Fisheries TechnologyICAR-Central Institute of Fisheries TechnologyMarine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteMarine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteMarine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteMarine Biotechnology Fish Nutrition and Health Division, ICAR-Central Marine Fisheries Research InstituteAbstract The Indian scad, Decapterus russelli is one of the most exploited pelagic resources of India. Population genetic analyses using mitochondrial and nuclear markers indicated a lack of genetic structuring among populations from Indian waters. As this species is highly migratory, it is also important to establish the environmental influence on its population structure. In the present study, the whole sagittal otolith composition was analysed using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) to assess spatial distribution of D. russelli collected from 4 sites along the Indian coast. Elemental ratios (Ba/Ca, Fe/Ca, K/Ca, Mg/Ca, Na/Ca, Sr/Ca and Zn/Ca) were analysed using univariate and multivariate statistics to determine whether this chemical signature can provide insight into the adaptive patterns. All element/Ca ratios are found to be significantly different between the four sampling locations (ANOVA, p < 0.05; MANOVA, p < 0.05). Five of the element/Ca ratios were found to be significantly different when the data was analysed coastwise (ANOVA, p < 0.05; MANOVA, p < 0.05). The LDA plot also showed the spatial heterogeneity of Element/Ca ratios between the four sampling sites, but some overlaps were also observed, reflecting the migratory ability of the species. This basic information on spatial ecology is required for formulating effective management and conservation strategies for the species.https://doi.org/10.1038/s41598-025-85719-3Element/Ca ratioFish stockICP-OESManagementOtolith chemistrySagittae |
| spellingShingle | Anjaly Jose Sandhya Sukumaran Neenu Raj K. Nisha Eldho Varghese S. J. Laly Satyen Kumar Panda Subal Kumar Roul P. Abdul Azeez Shoba Joe Kizhakudan A. Gopalakrishnan Otolith chemistry suggests population heterogeneity within a genetically homogeneous Indian scad population along Indian coast Scientific Reports Element/Ca ratio Fish stock ICP-OES Management Otolith chemistry Sagittae |
| title | Otolith chemistry suggests population heterogeneity within a genetically homogeneous Indian scad population along Indian coast |
| title_full | Otolith chemistry suggests population heterogeneity within a genetically homogeneous Indian scad population along Indian coast |
| title_fullStr | Otolith chemistry suggests population heterogeneity within a genetically homogeneous Indian scad population along Indian coast |
| title_full_unstemmed | Otolith chemistry suggests population heterogeneity within a genetically homogeneous Indian scad population along Indian coast |
| title_short | Otolith chemistry suggests population heterogeneity within a genetically homogeneous Indian scad population along Indian coast |
| title_sort | otolith chemistry suggests population heterogeneity within a genetically homogeneous indian scad population along indian coast |
| topic | Element/Ca ratio Fish stock ICP-OES Management Otolith chemistry Sagittae |
| url | https://doi.org/10.1038/s41598-025-85719-3 |
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