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Genetic population structure and historic demography of Indian mackerel, Rastrelliger kanagurta from Indian peninsular waters

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Relation http://eprints.cmfri.org.in/11618/
http://www.sciencedirect.com/science/article/pii/S0165783617300553
 
Title Genetic population structure and historic demography of Indian
mackerel, Rastrelliger kanagurta from Indian peninsular waters
 
Creator Sukumaran, Sandhya
Sebastian, Wilson
Gopalakrishnan, A
 
Subject Fish Genetics
 
Description An attempt was conducted to understand the genetic population structure and historic demography of
Indian mackerel, Rastrelliger kanagurta from Indian peninsular waters using mitochondrial DNA markers.
A total of 241 sequences of mitochondrial control region and 271 sequences of mitochondrial ATPase gene
region were amplified and analyzed in Indian mackerels collected from 10 different locations along Indian
coast resulting in 123 and 155 haplotypes respectively. In addition, control region sequences representing
samples from Thailand downloaded from NCBI were also used for analysis. Significant genetic differentiation
(�ST value of 0.38; P < 0.001) was recorded between samples from mainland India, Portblair and
Thailand when both control region and ATPase gene sequences were analyzed. Whilst, �ST values were
not significant when analyses were carried out between samples collected from mainland India. Oceanographic
and environmental barriers between mainland India, Portblair and Thailand contribute to limited
larval dispersal and restricted mixing between populations resulting in subtle genetic differentiation. The
lack of genetic subdivision between populations from mainland India indicates adequate gene flow and
mixing within Indian waters. Bayesian skyline plots revealed a history of population expansion taken
place approximately 10000 years ago coinciding with the time after the last glacial maximum or early
Holocene. Intensification of monsoon events after the last glacial maximum or early Holocene along the
Indian subcontinent contributed to increased productivity in the Tropical Indian Ocean and consequent
demographic expansion of mackerel populations historically. Management measures for Indian mackerel
populations could be devised regionally so as to conserve intra-specific diversity and biocomplexity of
this important resource.
 
Publisher Elsevier
 
Date 2017
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/11618/1/Gopalakrishnan_%20Sandhya_Sukumaran_%20Indian%20Mackerel%20-Fisheries%20Research_191_2017.pdf
Sukumaran, Sandhya and Sebastian, Wilson and Gopalakrishnan, A (2017) Genetic population structure and historic demography of Indian mackerel, Rastrelliger kanagurta from Indian peninsular waters. Fisheries Research, 191. pp. 1-9.