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Population genetic structure of the shovel-nosed lobster Thenus unimaculatus (Decapoda, Scyllaridae) in Indian waters based on RAPD and mitochondrial gene sequences

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Relation http://eprints.cmfri.org.in/10517/
 
Title Population genetic structure of the shovel-nosed lobster
Thenus unimaculatus (Decapoda, Scyllaridae) in Indian
waters based on RAPD and mitochondrial gene sequences
 
Creator Jeena, N S
Gopalakrishnan, A
Kizhakudan, Joe K
Radhakrishnan, E V
Kumar, Raj
Asokan, P K
 
Subject Lobsters
Fish Genetics
 
Description Thenus unimaculatus is one of the most
important commercially exploited lobster species in
India. The declining trend in catches as well as
collapse of fishery in some localities necessitated
assessment of the stock structure to manage this
resource sustainably. We ascertained the genetic stock
structure of T. unimaculatus along the Indian coast,
using molecular markers. RAPD and concatenated
dataset of mitochondrial DNA genes (partial
sequences of Cytochrome Oxidase I and Cytochrome
b) were used to detect population differentiation.
RAPD markers showed moderate genetic variability
with an overall GST value of 0.0442, which indicated
low genetic differentiation among subpopulations.
The mtDNA dataset revealed high haplotype diversity
coupled with very low nucleotide diversity that
suggested recent population expansion after a period
of low effective population size. The median-joining
haplotype network showed no geographical clustering
of haplotypes. The low levels of genetic differentiation
with non-significant P values (FST =0.0593) may be
due high connectivity among shovel-nosed lobster
populations and resultant panmixia. This may be due
to the planktonic phyllosoma larval phase that extends
for[1 month in wild and their transport and dispersal
by monsoon currents of Northern Indian Ocean. The
results of this study will aid in better management of
this dwindling resource.
 
Date 2015
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/10517/1/Thenus_Hydrobiologia_Jeena_2015.pdf
Jeena, N S and Gopalakrishnan, A and Kizhakudan, Joe K and Radhakrishnan, E V and Kumar, Raj and Asokan, P K (2015) Population genetic structure of the shovel-nosed lobster Thenus unimaculatus (Decapoda, Scyllaridae) in Indian waters based on RAPD and mitochondrial gene sequences. Hydrobiologia. pp. 1-12.