First evidence of regional migration of the copper shark <i>Carcharhinus brachyurus</i> (Günther, 1870) in the Southwest Atlantic

Cuevas, J. M.; García, Mirta Lidia; Gómez, Sergio L.; Chiaramonte, Gustavo Enrique

doi:10.1111/jfb.14927

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…These results are also concordant with reports on detailed movement patterns suggesting that C. brachyurus form a single biological stock from Western Australia to the coast of New South Wales (Huveneers et al., 2021 ). Elsewhere, long‐distance migrations have also been observed with the longest recapture distance of at least 2566 km recorded in the Southwest Atlantic (Cuevas et al., 2021 ), demonstrating that gene flow along vast distances is not restricted by the migration capabilities of the species.…”

Section: Discussionmentioning

confidence: 95%

Local adaptation with gene flow in a highly dispersive shark

Klein,

Maduna,

Dicken

et al. 2023

Evolutionary Applications

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Adaptive divergence in response to environmental clines are expected to be common in species occupying heterogeneous environments. Despite numerous advances in techniques appropriate for non‐model species, gene–environment association studies in elasmobranchs are still scarce. The bronze whaler or copper shark (Carcharhinus brachyurus) is a large coastal shark with a wide distribution and one of the most exploited elasmobranchs in southern Africa. Here, we assessed the distribution of neutral and adaptive genomic diversity in C. brachyurus across a highly heterogeneous environment in southern Africa based on genome‐wide SNPs obtained through a restriction site‐associated DNA method (3RAD). A combination of differentiation‐based genome‐scan (outflank) and genotype–environment analyses (redundancy analysis, latent factor mixed models) identified a total of 234 differentiation‐based outlier and candidate SNPs associated with bioclimatic variables. Analysis of 26,299 putatively neutral SNPs revealed moderate and evenly distributed levels of genomic diversity across sites from the east coast of South Africa to Angola. Multivariate and clustering analyses demonstrated a high degree of gene flow with no significant population structuring among or within ocean basins. In contrast, the putatively adaptive SNPs demonstrated the presence of two clusters and deep divergence between Angola and all other individuals from Namibia and South Africa. These results provide evidence for adaptive divergence in response to a heterogeneous seascape in a large, mobile shark despite high levels of gene flow. These results are expected to inform management strategies and policy at the national and regional level for conservation of C. brachyurus populations.

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Section: Discussionmentioning

confidence: 95%

Local adaptation with gene flow in a highly dispersive shark

Klein,

Maduna,

Dicken

et al. 2023

Evolutionary Applications

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Novel use of global occurrence data to indirectly predict suitable habitats for widely distributed marine species in data-scarce regions

De Wysiecki,

Barnett,

Sánchez-Carnero

et al. 2024

Preprint

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This study addresses the challenge of advancing habitat use knowledge of widely distributed marine species populations when regional data is scarce. To achieve this, we use an innovative approach based on ecological niche models (ENMs) calibrated with global presence data to estimate the global niche of species, allowing for indirect predictions of suitable habitats and potential distribution in one or more regions of interest. The method leverages a range of global occurrence records, including scientific papers, government data, biodiversity repositories, and citizen science contributions, to overcome regional data scarcity, which are then integrated with environmental variables to predict habitat suitability. As a case study, we apply this method to predict suitable habitats of copper (Carcharhinus brachyurus) and sand tiger (Carcharias taurus) sharks in the Southwest Atlantic, two species of conservation concern in a region with limited data. Suitable habitats for both species were predicted, information required to guide conservation efforts. Environmental factors were key to shaping predicted distribution patterns of these large predatory sharks, aligning with previous knowledge and historical records of their latitudinal ranges. The results have significant implications for the conservation planning and sustainable management of shark populations in the Southwest Atlantic, contributing to broader efforts of marine biodiversity preservation. Additionally, the study highlights the potential of ENMs to identify essential habitats even in the absence of effort data, underscoring their value in marine conservation. This study not only advances the use of niche modelling in marine systems but also demonstrates its applicability for area-based conservation initiatives, particularly in data-poor regions.

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First evidence of regional migration of the copper shark Carcharhinus brachyurus (Günther, 1870) in the Southwest Atlantic

Cited by 2 publications

References 12 publications

Local adaptation with gene flow in a highly dispersive shark

Local adaptation with gene flow in a highly dispersive shark

Novel use of global occurrence data to indirectly predict suitable habitats for widely distributed marine species in data-scarce regions

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