Morphokaryological variability and divergence of stargazers (Uranoscopus, perciformes) from the Mediterranean Sea basin: I. Divergence and taxonomic state of the Black Sea Stargazer

Васильева, Е.Д.

doi:10.1134/s0032945212040157

Cited by 2 publications

(1 citation statement)

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“…However, the rest of the morphometric and meristic characteristics were indistinct for U. cognatus from the WCT and ECPM, suggesting a close kinship or a shared common ancestor between the individuals, but with some phenotypic modifications for a better adaptation to the benthic lifestyle 15 . A low morphological divergence was also reported in the Atlantic stargazer ( U. scaber ) collected from five different seas around the Mediterranean Sea basin 78 and in U. marmoratus populations within Palk Bay India 53 , suggesting specific local adaptations to environmental changes.…”

Section: Discussionmentioning

confidence: 71%

Genetic diversity, population structure and historical demography of the two-spined yellowtail stargazer (Uranoscopus cognatus)

Yusoff

Jaafar

Vilasri³

et al. 2021

Sci Rep

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Benthic species, though ecologically important, are vulnerable to genetic loss and population size reduction due to impacts from fishing trawls. An assessment of genetic diversity and population structure is therefore needed to assist in a resource management program. To address this issue, the two-spined yellowtail stargazer (Uranoscopus cognatus) was collected within selected locations in the Indo-West Pacific (IWP). The partial mitochondrial DNA cytochrome c oxidase subunit 1 and the nuclear DNA recombination activating gene 1 were sequenced. Genetic diversity analyses revealed that the populations were moderately to highly diversified (haplotype diversity, H = 0.490–0.900, nucleotide diversity, π = 0.0010–0.0034) except sampling station (ST) 1 and 14. The low diversity level, however was apparent only in the matrilineal marker (H = 0.118–0.216; π = 0.0004–0.0008), possibly due to stochastic factors or anthropogenic stressors. Population structure analyses revealed a retention of ancestral polymorphism that was likely due to incomplete lineage sorting in U. cognatus, and prolonged vicariance by the Indo-Pacific Barrier has partitioned them into separate stock units. Population segregation was also shown by the phenotypic divergence in allopatric populations, regarding the premaxillary protrusion, which is possibly associated with the mechanism for upper jaw movement in biomechanical feeding approaches. The moderate genetic diversity estimated for each region, in addition to past population expansion events, indicated that U. cognatus within the IWP was still healthy and abundant (except in ST1 and 14), and two stock units were identified to be subjected to a specific resource management program.

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Section: Discussionmentioning

confidence: 71%