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Deciphering demographic history and fine-scale population structure of cobia, Rachycentron canadum (Pisces: Rachycentridae) using microsatellite and mitochondrial markers

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Relation http://eprints.cmfri.org.in/12347/
https://link.springer.com/article/10.1007/s12526-017-0817-x
DOI 10.1007/s12526-017-0817-x
 
Title Deciphering demographic history and fine-scale population structure
of cobia, Rachycentron canadum (Pisces: Rachycentridae) using
microsatellite and mitochondrial markers
 
Creator Divya, P R
Joy, Linu
Mohitha, C
Kathirvelpandian, A
Manoj, P
Basheer, V S
Gopalakrishnan, A
 
Subject Cobia
Fish Biotechnology
 
Description Cobia, Rachycentron canadum is a candidate species for aquaculture, distributed across the Indo-Pacific waters to the
southern Atlantic Ocean. Information on genetic diversity and population structure of cobia is crucial for sustainable utilization
and management of the species in natural waters. In the present study, we used 14 polymorphic microsatellite loci and mitochondrial
cytochrome b gene (980 bp) to investigate the genetic diversity and population structuring of R. canadum along the
Indian coast. Microsatellite analysis suggests a relatively high level of genetic diversity of cobia in the Indian region, with a mean
Ho and He of 0.76 and 0.73. The PIC was also highly informative (0.841), with a mean no. of alleles of 11.304. Hierarchical
AMOVA and genetic differentiation co-efficient between the populations was found to be low, but significant (FST = 0.035,
P < 0.001), indicating fine scale structuring in the region. Pair-wise FST, neighbor-joining tree, principal coordinates analysis, and
Bayesian analysis depict three populations of cobia in Indian waters: two in the Arabian Sea and one in the Bay of Bengal. The
mitochondrial gene analyses showed discordant findings in comparison with microsatellite markers. However, both the markers
yielded no inference of historical demographic bottleneck. Multi-modal mismatch distributions and ragged index, non-significant
Tajima’s D and Fu’s FS, and L-shaped distribution pattern of the allele frequencies, indicated the lack of bottleneck events of the
species in the recent past. Based on mitochondrial gene analysis, the population expansion was inferred to have occurred 0.046
Myrs ago, corresponding to the late Pleistocene.
 
Date 2017
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/12347/1/Divya%20P%20R_Linu_2017Marine%20Biodiversity_Deciphering%20demographic%20history%20and%20fine-scale%20population%20structure.pdf
Divya, P R and Joy, Linu and Mohitha, C and Kathirvelpandian, A and Manoj, P and Basheer, V S and Gopalakrishnan, A (2017) Deciphering demographic history and fine-scale population structure of cobia, Rachycentron canadum (Pisces: Rachycentridae) using microsatellite and mitochondrial markers. Marine Biodiversity. pp. 1-12. ISSN 1867-1616