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Population genetics of the hound needlefish Tylosurus crocodilus (Belonidae) indicate high connectivity in Tanzanian coastal waters
Stockholm University, Sweden; Tanzania Fisheries Research Institute, Tanzania.ORCID iD: 0000-0001-6055-2534
Tanzania Fisheries Research Institute, Tanzania.ORCID iD: 0000-0002-6546-4100
The Nelson Mandela African Institution of Science and Technology, Tanzania; The Leibniz Centre for Tropical Marine Research (ZMT), Germany.ORCID iD: 0000-0003-3082-0467
Sokoine University of Agriculture, Tanzania.ORCID iD: 0000-0002-8240-7087
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2023 (English)In: Marine Biology Research, ISSN 1745-1000, E-ISSN 1745-1019, Vol. 19, no 4-5, p. 261-270Article in journal (Refereed) Published
Abstract [en]

The hound needlefish Tylosurus crocodilus (Belonidae) is a highly demanded fish in the local markets of Tanzania, but the growing coastal population threatens its sustainability. As belonids are highly migratory fishes utilising various parts of the seascape, increased fishing pressure may disrupt connectivity patterns on different spatiotemporal scales and disaggregate populations. Using the COI gene, this study assessed the genetic population structure, connectivity patterns, and historical demography of T. crocodilus collected in seven sites spread along Tanzanian coastal waters. Results showed fourteen haplotypes with low overall nucleotide and haplotype diversity. Pairwise F-ST comparisons revealed no significant differences among the sampled sites, except for the northernmost site (Tanga) and an island in the south (Songosongo). Analysis of molecular variance (AMOVA) revealed a non-significant genetic structure among populations (F-ST = 0.01782), suggesting the fishery across Tanzanian waters exploits the same population. Moreover, there was no correlative relationship between genetic and pairwise geographic distances, rejecting the isolation by distance hypothesis. However, neutrality tests and mismatch distribution analysis revealed that recent demographic expansion might exist. Empirical evidence of panmixia suggests high genetic connectivity. In combination with low genetic diversity, management should be directed to actions that prevent genetic diversity loss and the effect of genetic drift on populations.

Place, publisher, year, edition, pages
Taylor & Francis, 2023. Vol. 19, no 4-5, p. 261-270
Keywords [en]
Hound needlefish, population structure, genetic diversity, haplotype diversity, genetic connectivity, >
National Category
Ecology
Identifiers
URN: urn:nbn:se:sh:diva-52148DOI: 10.1080/17451000.2023.2224026ISI: 001027493100001Scopus ID: 2-s2.0-85165136324OAI: oai:DiVA.org:sh-52148DiVA, id: diva2:1791255
Funder
Sida - Swedish International Development Cooperation AgencyAvailable from: 2023-08-24 Created: 2023-08-24 Last updated: 2023-08-30Bibliographically approved

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Gullström, Martin

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CiteExportLink to record
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Citation style
  • apa
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