High genetic diversity and limited spatial structure in an endangered, endemic South African sparid, the red steenbras Petrus rupestris

The red steenbras Petrus rupestris is endemic to South Africa, occurring from False Bay in the Western Cape Province to St Lucia in the province of KwaZulu-Natal. This species, the largest member of the family Sparidae, has undergone a substantial stock decline as a result of overfishing and is cons...

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Vydáno v:African journal of marine science Ročník 42; číslo 3; s. 295 - 306
Hlavní autoři: Gouws, G, Kerwath, SE, Potts, WM, James, NC, Vine, NG, Cowley, PD
Médium: Journal Article
Jazyk:angličtina
Vydáno: Grahamstown Taylor & Francis 01.10.2020
Taylor & Francis Ltd
Témata:
Deoxyribonucleic acid
Diversity indices
DNA
Endemic species
fish
fisheries management
Gene flow
Genetic analysis
Genetic diversity
genetic markers
Genetic structure
Genetic variation
haplotype diversity
Haplotypes
introns
Life history
linefish
longevity
Marine fishes
Migrate-n analysis
Migrations
mitochondria
Mitochondrial DNA
mtDNA control region
Offshore
Offshore engineering
Offshore structures
Overexploitation
Overfishing
panmixia
Petrus rupestris
population genetics
Regions
S7 intron 1
Saint Lucia
Sampling
South Africa
Sparidae
South Africa
Saint Lucia
ISSN:1814-232X, 1814-2338, 1814-2338
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Abstract The red steenbras Petrus rupestris is endemic to South Africa, occurring from False Bay in the Western Cape Province to St Lucia in the province of KwaZulu-Natal. This species, the largest member of the family Sparidae, has undergone a substantial stock decline as a result of overfishing and is considered to be collapsed. Various aspects of its life history, including high residency, predictable migrations, late maturity and longevity, have made it vulnerable to overexploitation. This study analysed the diversity and genetic structure of red steenbras across seven sampling regions, using mitochondrial (control region) and nuclear (S7 intron 1) DNA markers. Mitochondrial DNA haplotype diversity was high (0.976), exceeding that reported for most studied South African fishes. The haplotype network, a low global fixation index (φ ST = 0.013, p = 0.055) and pairwise comparisons indicated limited genetic differentiation among sampling regions and a general lack of spatial genetic structure, with the possible exception of the Agulhas Offshore and Transkei regions. Genetic diversity indices based on the S7 intron also indicated very low levels of genetic structuring among sampling regions. A Migrate-n analysis revealed highly asymmetrical migration rates and gene flow among the regions, reflecting aspects of the species' life history. These findings suggest that red steenbras exists as one panmictic population and should be managed as such.
AbstractList The red steenbras Petrus rupestris is endemic to South Africa, occurring from False Bay in the Western Cape Province to St Lucia in the province of KwaZulu-Natal. This species, the largest member of the family Sparidae, has undergone a substantial stock decline as a result of overfishing and is considered to be collapsed. Various aspects of its life history, including high residency, predictable migrations, late maturity and longevity, have made it vulnerable to overexploitation. This study analysed the diversity and genetic structure of red steenbras across seven sampling regions, using mitochondrial (control region) and nuclear (S7 intron 1) DNA markers. Mitochondrial DNA haplotype diversity was high (0.976), exceeding that reported for most studied South African fishes. The haplotype network, a low global fixation index (φST = 0.013, p = 0.055) and pairwise comparisons indicated limited genetic differentiation among sampling regions and a general lack of spatial genetic structure, with the possible exception of the Agulhas Offshore and Transkei regions. Genetic diversity indices based on the S7 intron also indicated very low levels of genetic structuring among sampling regions. A Migrate-n analysis revealed highly asymmetrical migration rates and gene flow among the regions, reflecting aspects of the species’ life history. These findings suggest that red steenbras exists as one panmictic population and should be managed as such.
The red steenbras Petrus rupestris is endemic to South Africa, occurring from False Bay in the Western Cape Province to St Lucia in the province of KwaZulu-Natal. This species, the largest member of the family Sparidae, has undergone a substantial stock decline as a result of overfishing and is considered to be collapsed. Various aspects of its life history, including high residency, predictable migrations, late maturity and longevity, have made it vulnerable to overexploitation. This study analysed the diversity and genetic structure of red steenbras across seven sampling regions, using mitochondrial (control region) and nuclear (S7 intron 1) DNA markers. Mitochondrial DNA haplotype diversity was high (0.976), exceeding that reported for most studied South African fishes. The haplotype network, a low global fixation index (φ ST = 0.013, p = 0.055) and pairwise comparisons indicated limited genetic differentiation among sampling regions and a general lack of spatial genetic structure, with the possible exception of the Agulhas Offshore and Transkei regions. Genetic diversity indices based on the S7 intron also indicated very low levels of genetic structuring among sampling regions. A Migrate-n analysis revealed highly asymmetrical migration rates and gene flow among the regions, reflecting aspects of the species' life history. These findings suggest that red steenbras exists as one panmictic population and should be managed as such.
Author Gouws, G
Vine, NG
Cowley, PD
Potts, WM
James, NC
Kerwath, SE
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Snippet The red steenbras Petrus rupestris is endemic to South Africa, occurring from False Bay in the Western Cape Province to St Lucia in the province of...
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SubjectTerms Deoxyribonucleic acid
Diversity indices
DNA
Endemic species
fish
fisheries management
Gene flow
Genetic analysis
Genetic diversity
genetic markers
Genetic structure
Genetic variation
haplotype diversity
Haplotypes
introns
Life history
linefish
longevity
Marine fishes
Migrate-n analysis
Migrations
mitochondria
Mitochondrial DNA
mtDNA control region
Offshore
Offshore engineering
Offshore structures
Overexploitation
Overfishing
panmixia
Petrus rupestris
population genetics
Regions
S7 intron 1
Saint Lucia
Sampling
South Africa
Sparidae
Title High genetic diversity and limited spatial structure in an endangered, endemic South African sparid, the red steenbras Petrus rupestris
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