Population genetic studies of genus Dicentrarchus reveal loss of genetic diversity in Egyptian waters

Ali, Fawzia S.; Mamoon, Ahmed

doi:10.1016/j.rsma.2019.100783

Cited by 5 publications

(5 citation statements)

References 49 publications

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“…Congruence in genetic structure across different species, however, is seldom the case in comparative phylogeographic studies of reef organisms (Borsa et al, 2016;DiBattista et al, 2017;Lessios & Robertson, 2006;Selkoe et al, 2014;Tenggardjaja et al, 2016;Toonen et al, 2011). Some studies have focused on genetic differentiation of marine and brackish populations using the COI gene within the northern Delta lakes and the Nile Delta in Egyptian waters (El-Nabi et al, 2017;Soliman et al, 2017;Abbas, 2018;Ali, 2019). It has been proposed that the construction of the Aswan Dam in the 1960s diminished the strength of the low salinity barrier due to freshwater outflow present prior to its construction (Vörösmarty & Sahagian, 2000;Alber, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Some studies have focused on genetic differentiation of marine and brackish populations using the COI gene within the northern Delta lakes and the Nile Delta in Egyptian waters (El-Nabi et al, 2017;Soliman et al, 2017;Abbas, 2018;Ali, 2019). It has been proposed that the construction of the Aswan Dam in the 1960s diminished the strength of the low salinity barrier due to freshwater outflow present prior to its construction (Vörösmarty & Sahagian, 2000;Alber, 2002).…”

Section: Discussionmentioning

confidence: 99%

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Preliminary genetic assessment of three goatfish species in the Mediterranean Sea

Soliman

DiBattista

Fahim

et al. 2021

Preprint

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We examined genetic diversity and connectivity of two indigenous Mediterranean goatfish species (Mullus barbatus and M. surmuletus), and a Lessepsian migrant species (Upeneus moluccensis), across the Nile Delta outflow using two mitochondrial DNA markers (COI and cyt b). Genetic diversity was high for the two Mediterranean species but relatively lower for the migrant species, suggesting founder effects after invasion from the Red Sea. Confirmation of this hypothesis, however, would require comparison with populations of origin in the Red Sea and the Indo-West Pacific. AMOVA and network analyses revealed no genetic partitioning for all species, indicating the Nile outflow does not currently, and may not have historically, posed a significant barrier to larval dispersal in these goatfish despite a present-day temperature and salinity gradient along the Mediterranean coastline of Egypt.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Preliminary genetic assessment of three goatfish species in the Mediterranean Sea

Soliman

DiBattista

Fahim

et al. 2021

Preprint

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“…Mitochondrial DNA (mtDNA) is being used more often to assess changes in genetic diversity compared to AFLPs [21,[35][36][37][38]. This technique utilises cytochrome c oxidase subunit I (COI) and the D-loop section of mtDNA.…”

Section: Mitochondrial Dnamentioning

confidence: 99%

The Riddle of How Fisheries Influence Genetic Diversity

Sadler,

Watts,

Uusi-Heikkilä

2023

Fishes

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Overfishing drives population decline, which in turn drives loss of genetic diversity. Many studies provide evidence of declines in genetic diversity; however, controversy exists within the literature, as some studies show evidence of no change in genetic diversity despite decades of overharvesting. The apparent discrepancy in the literature should therefore be examined to understand what biological and ecological processes are driving the differences in results. Here, we assess how different factors contribute to fisheries-induced susceptibility to declines in genetic diversity by first focusing on the different roles of genetic markers. Second, we assess how habitat type and conditions contribute to loss of genetic diversity. Third, we assess how life history and physiology affects catchability and loss of genetic diversity. Finally, we discuss how coinciding abiotic and biotic factors influence the intensity of genetic loss. We find a multitude of these factors could be interacting to influence how results are perceived and how intense the loss of genetic diversity can be. Future studies should carefully consider the methodology of genetic analysis used, as well as considerations of life history and ecology of the target species.

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“…The two species of genus Dicentrarchus are close relatives in their morphological features, particularly, in the early stages of development (Merlo et al, 2010;Ali and Mamoon, 2019). The use of multiple identification tools can aid in the accurate identification of a species.…”

Section: Introductionmentioning

confidence: 99%

Comparative Molecular Identification of Genus Dicentrarchus Using Mitochondrial Genes and Internal Transcribed Spacer Region

Ali¹,

Ismail²,

Mamoon³

2019

Egypt. J. of Aquatic Biolo. and Fish.

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DNA barcoding is one of the powerful DNA-based identification tools that are used for accurate identification of a species. Despite several DNA barcodes were used, the accuracy and suitability of these barcodes depend on speciesspecific variations.The current study was conducted to compare the efficiency of two mitochondrial genes to the nuclear Internal Transcribed Spacer (ITS) region in the molecular identification of genus Dicentrarchus. A total of 80 fish samples for Dicentrarchus labrax and Dicentrarchus punctatus were randomly collected from two different locations in Egypt; Alexandria and Bardawil Lagoon. All samples were morphologically characterized. For species barcoding, the ITS region was firstly employed to carry out the PCR amplifications. Additionally, two mitochondrial genes; cytochrome b (Cyt b) and cytochrome oxidase subunit I (COI) were also used for species barcoding. To evaluate the efficiency of each marker, three different approaches were used. Firstly, phylogenetic relationship was constructed between the collected samples and a reference species using each genetic marker. Secondly, Automated Barcode Gap Discovery (ABGD) method was used for each marker in order to assign the samples into presumed species without priori species assumption. Lastly, the Poisson Tree Processes (PTP) model was used which relies on Bayesian support values to delimit species on the input tree. The two species of genus Dicentrarchus exhibited nearly similar ITS sequences, leading to an ambiguous identification of the two species. However, the two mitochondrial COI and Cyt b genes were able to accurately distinguish between the two species. The three approaches, phylogeny, ABGD and PTP presented consistent results. Overall, COI and Cyt b outperformed ITS in assigning species accurately. Mitochondrial barcodes could provide a leading guide for fish species identification. ITS should be abandoned in favor of COI and Cyt b as primary DNA barcode markers for fish species in general and Dicentrarchus genus, in particular.

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Population genetic studies of genus Dicentrarchus reveal loss of genetic diversity in Egyptian waters

Cited by 5 publications

References 49 publications

Preliminary genetic assessment of three goatfish species in the Mediterranean Sea

Preliminary genetic assessment of three goatfish species in the Mediterranean Sea

The Riddle of How Fisheries Influence Genetic Diversity

Comparative Molecular Identification of Genus Dicentrarchus Using Mitochondrial Genes and Internal Transcribed Spacer Region

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