Sukumaran, Sandhya and Gopalakrishnan, A and Sebastian, Wilson and Vijayagopal, P and Rao, S Nandakumar and Raju, N and Ismail, Shihab and Abdussamad, E M and Asokan, P K and Koya, K P Said and Rohit, Prathibha (2016) Morphological divergence in Indian oil sardine, Sardinella longiceps Valenciennes, 1847– Does it imply adaptive variation? Journal of Applied Ichthyology, 32. pp. 706-711.
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Journal of Applied Ichthyology_Sandhya Sukumaran_2016_Morphological divergence inIndian oil sardine.pdf Download (319kB) | Preview |
Abstract
The Indian oil sardine, Sardinella longiceps, is an important pelagic species in Indian waters, and shows divergent morphology while in sympatry. The reasons behind this divergent morphology were investigated using morphometric, genetic and nutritional analyses. Twenty-one morphometric characters (as percentage of standard length) and eight meristic characters were studied in the three variants to assess whether they are significantly diverged. Distinct clustering of morphotypes was evident in the principal component analysis on log-transformed ratios of morphological characters with PC1 and PC2, explaining 50.7% and 17.6% of the total morphological variation, respectively. PC1 was highly correlated with the distance from snout to anal origin, depth at dorsal, distance from snout to pelvic and distance from snout to first dorsal. PC2 was highly correlated with head length, caudal width and anal depth. Analysis of similarities (ANOSIM) was conducted using log-transformed morphometric ratios, with the results showing the clusters to be well differentiated (R = 0.511; P < 0.01). Similarity of percentage analysis (SIMPER) analysis showed that the differences in depth at the dorsal, anal base length, caudal width, distance from pelvic to anal origin, anal depth and eye diameter accounted for 52% of variations between variant 1 and 2. Differences in caudal width, distance from pelvic to anal origin, anal base length, depth at dorsal and anal depth accounted for 56% of the variation between variant 2 and 3. Differences in caudal width, eye diameter, anal base length, anal depth, distance from pelvic to anal origin accounted for 50% of the variation between variant 1 and 3. Genetic divergence was not significantly based on mitochondrial cytochrome c oxidase I (COI) or control region sequences. Proximate composition analyses showed significantly high fat content in variants 1&3 and significantly high protein content in variant 2, probably due to dissimilar dietary preferences. The study shows that morphotypes of the Indian oil sardine may be the result of divergent selection and adaptive variations, which need further investigation using a long-term sampling design.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Morphological divergence; Indian oil sardine; Sardinella longiceps Valenciennes |
| Subjects: | Fish Biotechnology Fish Genetics |
| Divisions: | CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division Subject Area > CMFRI > CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division Subject Area > CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division |
| Depositing User: | Arun Surendran |
| Date Deposited: | 27 Aug 2016 09:57 |
| Last Modified: | 01 Apr 2024 10:54 |
| URI: | http://eprints.cmfri.org.in/id/eprint/11007 |
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