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Temporal genetic variability of landed Siganus sutor reveals a mixed stock fishery in coastal Kenya
Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Biologi. Stockholms universitet.
Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.ORCID-id: 0000-0002-3667-3667
Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Biologi.ORCID-id: 0000-0003-3389-4162
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Abstract [en]

Artisanal fisheries in Kenya have been in decline since the 1980’s and are currently managed by gear restriction and no take zones. The fishery is a mixed species fishery but the Shoemaker spinefoot (Siganus sutor) comprise a large portion of the total catches. The sustainable use of these resources is dependent on informed assessment and management of the harvested species. In Kenya there is a lack of critical information about landings, fish stock productivity and genetic stock structure, and there is no knowledge of populations size or genetic variation of S. sutor. In this study we used the molecular marker, AFLP to investigate the genetic variation within and between sites of S. sutor landed along the 200 km coast of Kenya. We compared the spatial genetic variation among sites with the within site temporal genetic variation from a single site, adjacent to a number of spawning aggregations. Our results show that the there is genetic variation among the sites (spatial variation) and that the temporal genetic variation with in a six week period was about 1/5 of the spatial genetic variation. We believe these findings to be an important aspect to considered for both future scientific research as well as management.

Nyckelord [en]
siganus, sutor, aflp, east africa
Nationell ämneskategori
Zoologi
Forskningsämne
zoologisk ekologi
Identifikatorer
URN: urn:nbn:se:sh:diva-22802OAI: oai:DiVA.org:sh-22802DiVA, id: diva2:706616
Anmärkning

Som manuskript i avhandling. As manuscript in dissertation.

Tillgänglig från: 2013-08-11 Skapad: 2014-03-21 Senast uppdaterad: 2021-01-25Bibliografiskt granskad
Ingår i avhandling
1. Genetic connectivity of fish in the Western Indian Ocean
Öppna denna publikation i ny flik eller fönster >>Genetic connectivity of fish in the Western Indian Ocean
2013 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Zoology, Stockholm University, 2013. s. 43
Serie
Södertörn doctoral dissertations, ISSN 1652-7399 ; 84
Nyckelord
population genetics, indian ocean, siganus sutor, valamugil buchanani, scarus ghobban, connectivity, aflp, mtDNA, d-loop, CO1
Nationell ämneskategori
Zoologi
Forskningsämne
zoologisk ekologi
Identifikatorer
urn:nbn:se:sh:diva-22799 (URN)978-91-7447-729-0 (ISBN)978-91-86069-74-2 (ISBN)
Disputation
2013-09-27, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, 13:00 (Engelska)
Opponent
Handledare
Anmärkning

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

Tillgänglig från: 2014-03-21 Skapad: 2014-03-21 Senast uppdaterad: 2015-07-17Bibliografiskt granskad

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Henriksson, OskarLarsson, JosefineGrahn, Mats

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