Genetic polymorphism and phylogenetic relationships of the brushtooth lizardfish (Saurida undosquamis) (Aulopiformes: Synodontidae) based on mitochondrial DNA markers

Tan, Min Pau; Sammogam, Revarunan; Nur, Nuralif Fakhrullah Mohd; Yusoff, Nur Ilham Syahadah Mohd; Jaafar, Tun Nurul Aimi Mat; Nor, Siti Azizah Mohd; Sung, Yeong Yik; Danish-Daniel, Muhd; Megarajan, Sekar

doi:10.1007/s12526-021-01250-4

Cited by 1 publication

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“…Gene flow across marine habitats associated to individual movements is not however ruled out for mature A. butcheri and may be contributing to the albeit limited gene flow seen at larger distances (i.e. 100 s kms), as seen in other species (Cheng et al., 2015 ; Tan et al., 2022 ). Overall, the need for estuarine conditions for spawning and subsequent egg and larval survival (Jenkins et al., 2018 ; Williams et al., 2020 ) is reflected in the overall philopatry we have identified, with connectivity among estuaries most likely a result of adult fish movements.…”

Section: Discussionmentioning

confidence: 99%

Strong philopatry in an estuarine‐dependent fish

Sarakinis,

Reis‐Santos,

Donnellan

et al. 2024

Ecology and Evolution

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Understanding fish movement is critical in determining the spatial scales in which to appropriately manage wild populations. Genetic markers provide a natural tagging approach to assess the degree of gene flow and population connectivity across a species distribution. We investigated the genetic structure of black bream Acanthopagrus butcheri across its entire distribution range in Australia, as well as regional scale gene flow across south‐eastern Australia by undertaking a comprehensive analysis of the populations in estuaries across the region. We applied genome‐wide sampling of single‐nucleotide polymorphism (SNP) markers generated from restriction site‐associated DNA sequencing. Genetic structure and potential gene flow was assessed using principal component analyses and admixture analyses (STRUCTURE). Using 33,493 SNPs, we detected broad scale genetic structuring, with limited gene flow among regional clusters (i.e. Western Australia, South Australia and western Victoria; and eastern Victoria, Tasmania and New South Wales). This is likely the result of unsuitable habitats, strong ocean currents (e.g. the Leeuwin Current and the East Australian Current), large water bodies (e.g. Bass Strait) and known biogeographical provinces across the continent. Local‐scale genetic structuring was also identified across the south‐eastern Australian estuaries sampled, reflecting that the coexistence of both migratory and resident individuals within populations (i.e. partial migration), and the movement of fish into coastal waters, still results in strong philopatry across the region. Instances of movement among estuaries at this spatial scale were primarily found between adjacent estuaries and were likely attributed to lone migrants utilising inshore coastal currents for movement beyond nearby habitats. Targeting SNP markers in A. butcheri at this continental scale highlighted how neither spatial proximity of estuaries nor black bream's ability to move into coastal waters reflects increased gene flow. Overall, our findings highlight the importance of location‐specific management.

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