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Contrasting population genetic structure of Siganus sutor between mainland coastal and oceanic island populations
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Biology. Stockholms universitet.
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Biology.ORCID iD: 0000-0003-3389-4162
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Studies on genetic connectivity are important for the management of fisheries. In this study we used AFLP to investigate population structure of the endemic Spinefoot shoemaker, Siganus sutor, from 6 countries, Kenya, Tanzania, Comoros, Seychelles and Mauritius in the Western Indian Ocean. We collected 506 samples from 20 fish landing sites, 171 variable loci were used in the statistical analysis. Global FST was significant and showed a pattern of isolation by distance, mostly influenced by remote oceanic islands. In a previous study we have described the temporal variation of Siganus sutor to be about 1/5 of the global variation, and by applying a 1/5 of the global variation cut of value for the pair-wise comparisons we were able to account some of the pair- wise genetic variation as temporal fluctuations. A STRUCTURE analysis was also preformed that corroborates the pair-wise FST comparisons. Overall these results show that S. sutor is genetically diverse and subdivided throughout the region, but also that the current management regime might not be optimal. 

Keyword [en]
AFLP, siganu sutor, east africa, populations
National Category
Evolutionary Biology
Research subject
Animal Ecology
Identifiers
URN: urn:nbn:se:sh:diva-22801OAI: oai:DiVA.org:sh-22801DiVA: diva2:706619
Note

Som manuskript i avhandling. As manuscript in dissertation.

Available from: 2013-08-11 Created: 2014-03-21 Last updated: 2015-07-17Bibliographically 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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