Population genomic and size distribution data suggest high genetic connectivity in the sandbar shark (Carcharhinus plumbeus) along a 2700 km coastline

Pember, Brenton M.; Chaplin, Jennifer A.; Braccini, Matías; Loneragan, N.R.

doi:10.1016/j.fishres.2023.106779

Cited by 1 publication

(1 citation statement)

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“…On the one hand, a pattern of decreasing genetic similarity with increasing genetic distance may persist across the entire range, driven by the continuous nature of the species distribution. There are a handful of examples demonstrating isolation by distance in similarly coastal shark species, including the lemon shark ( Negaprion brevirostris ), sandbar shark ( Carcharhinus plumbeus) and Caribbean reef shark ( Carcharhinus perezi, Ashe et al, 2015; Bernard et al, 2017; Pember et al, 2023), however it is rare for complete distributions to have been investigated. Yet, even under such scenarios, adaptive loci may show signatures of differentiation despite clinal variation at neutral loci (Turbek et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

Population structure and genetic diversity of the Critically Endangered bowmouth guitarfish (Rhina ancylostomus) in the Northwest Indian Ocean

Kipperman,

Jabado,

Haque

et al. 2024

Preprint

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The bowmouth guitarfish (Rhina ancylostomus) is a unique and relatively understudied species of wedgefish with a distribution spanning the Indo-Pacific Oceans. Due to targeted and bycatch fisheries, this species is experiencing serious declines across its range. It is now considered among the most threatened species of elasmobranch. Despite this, species-specific management is limited, particularly around primary fishing hotspots. This is in part due to knowing very little about fundamental population processes. Here, we combine mitochondrial and single nucleotide polymorphism (SNP) data to carry out the first genetic assessment ofR. ancylostomusacross the Northwest Indian Ocean. We find evidence for population structure across the species' northwest range that is best explained by dispersal constraints and therefore emphasises the importance of habitat connectivity. We also uncover a cline in genetic variation from east to west of the sampling distribution and identify regions in potential need of heightened protection. In doing so, our study provides baseline information to support conservation management ofR. ancylostomusand highlights the value of genomic data in elasmobranch conservation.

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