Genetic analysis reveals harvested Lethrinus nebulosus in the Southwest Indian Ocean comprise two cryptic species

Healey, Amy J E; Gouws, Gavin; Fennessy, Sean T; Kuguru, Baraka; Sauer, Warwick H H; Shaw, Paul W; McKeown, Niall J

Title: Genetic analysis reveals harvested Lethrinus nebulosus in the Southwest Indian Ocean comprise two cryptic species
Creator: Healey, Amy J E
Creator: Gouws, Gavin
Creator: Fennessy, Sean T
Creator: Kuguru, Baraka
Creator: Sauer, Warwick H H
Creator: Shaw, Paul W
Creator: McKeown, Niall J
Date Issued: 2018
Date: 2018
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/124538
Identifier: vital:35626
Identifier: https://doi.10.1093/icesjms/fsx245
Description: This study initially aimed to investigate the genetic population/stock structuring of Lethrinus nebulosus in the Southwest Indian Ocean (SWIO) to inform management practices in light of emerging evidence of overharvesting of this species throughout its distribution. Adult samples were genotyped for 14 nuclear microsatellites and by sequencing fragments of the mtDNA control region and COI gene. A salient feature of the data was the congruent cyto-nuclear partitioning of samples into two high divergent, reciprocally monophyletic groups. This indicates that despite no a priori evidence, hitherto described L. nebulosus in the SWIO comprises two cryptic species that co-occur among southern samples. This intermingling indicates that, at least in southern samples, both species are being indiscriminately harvested, which may severely compromise sustainability. Limited microsatellite differentiation was detected within both species, though there was some evidence of isolation in the Mauritian population. In contrast, mtDNA revealed a pattern consistent with chaotic genetic patchiness, likely promoted by stochastic recruitment, which may necessitate a spatial bet-hedging approach to management to satisfy fishery management and conservation goals.
Format: 8 pages
Format: pdf
Language: English
Relation: ICES Journal of Marine Science
Relation: Healey, A.J., Gouws, G., Fennessy, S.T., Kuguru, B., Sauer, W.H., Shaw, P.W., McKeown, N.J. and Handling editor: W. Stewart Grant, 2018. Genetic analysis reveals harvested Lethrinus nebulosus in the Southwest Indian Ocean comprise two cryptic species. ICES Journal of Marine Science, 75(4), pp.1465-1472
Relation: ICES Journal of Marine Science volume 75 number 4 1465 1472 2018 1054-3139
Rights: ICES Journal of Marine Science
Rights: Use of this resource is governed by the terms and conditions of the Oxford Academic Journals Open Access Policy Statement (https://academic.oup.com/journals/pages/open_access)

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Sauer, Warwick H H (Prof)

RU Department of Ichthyology and Fisheries Science

RU South African Institute for Aquatic Biodiversity (SAIAB)

SDG 14. Life Below Water

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