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Genetic connectivity and historical demography of the blue barred parrotfish (Scarus ghobban) in the western Indian Ocean
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2010 (English)In: Marine Biology, ISSN 0025-3162, E-ISSN 1432-1793, Vol. 157, no 7, 1475-1487 p.Article in journal (Refereed) Published
Abstract [en]

Studies on genetic connectivity are essential for the design of management strategies for coral reef fisheries. In this study we used a mitochondrial DNA marker to investigate population structure of the reef-associated parrotfish, Scarus ghobban, from four countries, Kenya, Mauritius, Seychelles and Tanzania, in the western Indian Ocean. We obtained nucleotide sequences of the mitochondrial control region for 117 individuals. Measures of haplotype diversity were relatively high. Pairwise population differentiation (F (ST)) was low, but not always non-significant. Analysis of molecular variance (AMOVA) showed genetic differentiation between groups, when the data was partitioned into two groups consisting of samples from Mauritius and Tanzania in one group, and samples from Kenya and Seychelles in another group. Direction of gene flow was estimated using a Bayesian approach. Migration was sometimes asymmetric or directional, coinciding with the flow of major oceanic and coastal currents in the region. Mismatch distributions, based on the observed number of differences among haplotype pairs, produced a unimodal distribution, indicative of recent demographic expansion. Phylogenetic analyses revealed three clades without any geographic structure, suggesting recent migration between historically isolated lineages. We reconstructed the historical demography of S. ghobban and examined it in the context of Pleistocene climate stages and changes in relative sea level. Overall, these results showed that populations of S. ghobban are genetically diverse and have relatively high gene flow, with some genetic structuring in the western Indian Ocean.

Place, publisher, year, edition, pages
2010. Vol. 157, no 7, 1475-1487 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:sh:diva-5563DOI: 10.1007/s00227-010-1422-8ISI: 000278837600005Scopus ID: 2-s2.0-77954028773OAI: oai:DiVA.org:sh-5563DiVA: diva2:389052
Available from: 2011-01-18 Created: 2011-01-18 Last updated: 2014-03-21Bibliographically approved
In thesis
1. Genetic connectivity of fish in the Western Indian Ocean
Open this publication in new window or tab >>Genetic connectivity of fish in the Western Indian Ocean
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

An almost unbroken fringing reef runs along the east coast of Africa, the lagoon inside the reef is the foundation of almost all artisanal fisheries. It is a low-tech fishery conducted by many people. Some areas can have up to 19 fishermen per square kilometer. High fishing pressures, coupled with declining fish stocks has led to changes in mean size and reproductive age of many exploited species. There is a vital and urgent need for scientifically based management systems, including the utilization of genetic information to guide management practices.

This thesis aims to investigate the presence of genetic structures in the western Indian Ocean. In order to do that we first investigated the historical patterns of connectivity throughout the region (paper I). In papers II and III we focused on local scale connectivity in Kenya and Tanzania and finally in paper IV we investigate the large-scale contemporary gene flow throughout the Western Indian Ocean. In paper III we also investigate the temporal genetic variation at one site and compare it to the small-scale genetic variation along a stretch of the Kenyan coastline. Some overall conclusions that can be drawn from my body of work are: there are genetic structures present in the western Indian Ocean even though the apparent lack of physical barriers. Major oceanic currents aid evolutionary dispersal patterns. A single geographic site need not be genetically homogenous or temporally stable. Island sites are genetically more homogenous than mainland sites.

In conclusion, there are clear and distinct genetic structures present especially in Siganus sutor, the most targeted fish for the artisanal fishery in East Africa.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2013. 43 p.
Series
Södertörn doctoral dissertations, ISSN 1652-7399 ; 84
Keyword
population genetics, indian ocean, siganus sutor, valamugil buchanani, scarus ghobban, connectivity, aflp, mtDNA, d-loop, CO1
National Category
Zoology
Research subject
Animal Ecology
Identifiers
urn:nbn:se:sh:diva-22799 (URN)978-91-7447-729-0 (ISBN)978-91-86069-74-2 (ISBN)
Public defence
2013-09-27, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2014-03-21 Created: 2014-03-21 Last updated: 2015-07-17Bibliographically approved

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