Genetic connectivity in a herbivorous coral reef fish (Acanthurus leucosternon Bennet, 1833) in the Eastern African region

Otwoma, Levy Michael; Reuter, Hauke; Timm, Janne; Meyer, A. B.

doi:10.1007/s10750-017-3363-4

Cited by 15 publications

(12 citation statements)

References 81 publications

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“…Low genetic differentiation has been observed on Acanthurus leucosternon in Eastern Africa based on mitochondrial DNA and C. laticeps and Caffrogobius caffer, in South Africa (Neethling et al, 2008; Teske et al, 2010; Otwoma et al, 2018). Contrary results have been observed on fish of the same family, L. mahsena and Lethrinus harak , in the South West Indian Ocean (SWIO), which showed significant genetic differentiation and structuring of samples from different localities (Healey et al, 2018).…”

Section: Discussionmentioning

confidence: 96%

Genetic Connectivity of the Sky Emperor, Lethrinus mahsena Populations Across a Gradient of Exploitation Rates in Coastal Kenya

et al. 2019

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Marine-protected areas (MPAs) have the potential to enhance fisheries through transport of larvae or by a net emigration of adult and juvenile fish to adjacent fished areas. A network of appropriately located MPAs will have the potential to reseed fished areas and other MPAs. Connectivity studies are therefore important to assess the effectiveness of a network of MPAs and to determine the spatial scale necessary for spillover effects. The principal aim of this study was to determine the potential for Kenyan MPAs to reseed adjacent fishing zones by evaluating the levels of genetic differentiation of populations of Lethrinus mahsena, a commercially important fish, along a continuum of protected and nonprotected sites. Fish samples were collected from MPAs (Mombasa and Kisite Mpunguti Marine Parks) and the fished reserves adjacent to the two MPAs. Total length and weight of the fish from the sites and fin clips from one of the pectoral fins were collected and preserved in 90% ethanol. Genomic profiles for each sample were obtained through genotyping by sequencing using diversity array technology markers. Results from population structure, diversity, and admixture analyses indicated very low genetic differentiation (F ST = 0.00184, P > 0.05) and low population substructure between samples obtained from the study locations implying a free exchange of fish across protected and nonprotected sites. There was a high gene flow and multidirectional migration rate among the sampling sites. Inbreeding was moderately high (F IS = 0.15, P < 0.05) in the marine parks, indicating high relatedness and probably limited mating options for the species due to small population size or spatial restriction. The lack of genetic differentiation between protected areas and open fishing grounds is indicative of genetic connectivity for the sky emperor. This reinforces the significance of maintaining protected areas to serve as breeding and spawning grounds of fish without adversely affecting the livelihoods of communities that depend on the various fisheries linked to MPAs.

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Section: Discussionmentioning

confidence: 96%

Genetic Connectivity of the Sky Emperor, Lethrinus mahsena Populations Across a Gradient of Exploitation Rates in Coastal Kenya

et al. 2019

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“…Overall, the results of genetic homogeneity in A. triostegus are consistent with the findings of biophysical modeling of connectivity, which indicates that population connectivity in the WIO increases with increase in dispersal ability (Crochelet et al ., ; Mayorga‐Adame et al ., ). Genetic homogeneity in the WIO has also been observed in other reef fish such as Lutjanus kasmira (Forsskål 1775) (Muths et al ., ), Scarus ghobban Forsskål 1775 (Visram et al ., ), Amphiprion akallopisos Bleeker 1853 (Huyghe & Kochzius, ), Dascyllus trimaculatus (Rüppell 1829) (O'Donnell et al ., ) and Acanthurus leucosternon Bennet 1833 (Otwoma et al ., ). Nevertheless, the lack of structure found for A. triostegus in the WIO have to be interpreted with caution as the number of individuals analysed for this region is low.…”

Section: Discussionmentioning

confidence: 97%

Genetic population structure of the convict surgeonfish Acanthurus triostegus: a phylogeographic reassessment across its range

Otwoma

Diemel

Reuter

et al. 2018

Journal of Fish Biology

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This study investigates the genetic population structure and connectivity of Acanthurus triostegus in five Indo-Pacific biogeographic regions (western and eastern Indian Ocean, western, central and eastern Pacific Ocean), using a mitochondrial DNA marker spanning the ATPase8 and ATPase6 gene regions. In order to assess the phylogeography and genetic population structure of A. triostegus across its range, 35 individuals were sampled from five localities in the western Indian Ocean and complemented with 227 sequences from two previous studies. Results from the overall analysis of molecular variance (AMOVA) without a priori grouping showed evidence of significant differentiation in the Indo-Pacific, with 25 (8.3%) out of 300 pairwise Φ comparisons being significant. However, the hierarchical AMOVA grouping of Indian and Pacific Ocean populations failed to support the vicariance hypothesis, showing a lack of a genetic break between the two ocean basins. Instead, the correlation between pairwise Φ values and geographic distance showed that dispersal of A. triostegus in the Indo-Pacific Ocean follows an isolation-by-distance model. Three haplogroups could be deduced from the haplotype network and phylogenetic tree, with haplogroup 1 and 2 dominating the Indian and the Pacific Ocean, respectively, while haplogroup 3 exclusively occurring in the Hawaiian Archipelago of the central Pacific Ocean.

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“…Although there are currently no bonefish – or even elopomorph – larval dispersal models for the Indian Ocean, pelagic larval dispersal simulation models of coral species in the southwestern Indian Ocean corroborate the biogeographic break between Seychelles and Mauritius, suggesting connectivity is limited even when the pelagic larval duration is between 50–60 days [125, 134]. However, these models considered coral larvae, which are completely reliant on currents for their dispersal [122, 134, 135]. Whilst the dispersal behavior of A. glossodonta larvae is unknown, we speculate that, similar to eels (Anguillidae; which also have long pelagic larval durations), bonefishes could disperse greater distances than passive corals by having the ability to swim (e.g., Anguilla japonica [136]) or may even take part in vertical migrations (e.g., Anguilla japonica [137, 138]).…”

Section: Discussionmentioning

confidence: 99%

Genome Assembly of the Roundjaw Bonefish (Albula glossodonta), a Vulnerable Circumtropical Sportfish

Pickett

Talma

Glass

et al. 2021

Preprint

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Background: Bonefishes are cryptic species indiscriminately targeted by subsistence and recreational fisheries worldwide. The roundjaw bonefish, Albula glossodonta is the most widespread bonefish species in the Indo-Pacific and is listed as vulnerable to extinction by the IUCN's Red List due to anthropogenic activities. Whole-genome datasets allow for improved population and species delimitation, which – prior to this study – were lacking for Albula species. Results: We generated a high-quality genome assembly of an A. glossodonta individual from Hawai'i, USA. The assembled contigs had an NG50 of 4.75 Mbp and a maximum length of 28.2 Mbp. Scaffolding yielded an NG50 of 14.49 Mbp, with the longest scaffold reaching 42.29 Mbp. Half the genome was contained in 20 scaffolds. The genome was annotated with 28.3 K protein-coding genes. We then analyzed 66 A. glossodonta individuals and 38,355 SNP loci to evaluate population genetic connectivity between six atolls in Seychelles and Mauritius in the Western Indian Ocean. We observed genetic homogeneity between atolls in Seychelles and evidence of reduced gene flow between Seychelles and Mauritius. The South Equatorial Current could be one mechanism limiting gene flow of A. glossodonta populations between Seychelles and Mauritius. Conclusions: Quantifying the spatial population structure of widespread fishery species such as bonefishes is necessary for effective transboundary management and conservation. This population genomic dataset mapped to a high-quality genome assembly allowed us to discern shallow population structure in a widespread species in the Western Indian Ocean. The genome assembly will be useful for addressing the taxonomic uncertainties of bonefishes globally.

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Genetic connectivity in a herbivorous coral reef fish (Acanthurus leucosternon Bennet, 1833) in the Eastern African region

Cited by 15 publications

References 81 publications

Genetic Connectivity of the Sky Emperor, Lethrinus mahsena Populations Across a Gradient of Exploitation Rates in Coastal Kenya

Genetic Connectivity of the Sky Emperor, Lethrinus mahsena Populations Across a Gradient of Exploitation Rates in Coastal Kenya

Genetic population structure of the convict surgeonfish Acanthurus triostegus: a phylogeographic reassessment across its range

Genome Assembly of the Roundjaw Bonefish (Albula glossodonta), a Vulnerable Circumtropical Sportfish

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