Abstract
The angular angelshark (Squatina guggenheim) is a coastal endangered angel shark from the Southwest Atlantic Ocean and one of the major bycatch victims. Despite major concerns about this species, little is known about its evolutionary connectivity across its whole geographic distribution. Here, genetic connectivity and phylogeographic patterns of S. guggenheim for 122 individuals were assessed across the Southwest Atlantic Ocean regions based on a multilocus mitochondrial DNA approach to support conservation strategies. The concatenated mitochondrial dataset (control region, cytochrome b and cytochrome c oxidase I) showed high levels of haplotype diversity and low nucleotide diversity in S. guggenheim, with distinct genetic diversity patterns among populations. Although signs of step**-stone gene flow were observed, a strong and statistically significant genetic structure into at least two populations was detected, matching with the species’ biological traits and region’s oceanographic particularities. Contrasting demographic patterns were detected, in which only southernmost Atlantic populations showed signs of population expansion. Despite the existence of connectivity among regions, our results suggest that conservation plans should be carried out following the uniqueness of each management unit.
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Data availability
DNA sequences of all molecular markers have been submitted to GenBank (https://www.ncbi.nlm.nih.gov/genbank), accession numbers: MW456691- MW456735.
Code availability
Not applicable.
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Acknowledgements
The authors are grateful to all fishermen from “Pró-Pesca Project: fishing the knowledge” for donating some specimens from Brazil, Dr. Luís Gustavo Cardoso (Instituto Oceanográfico, Universidade Federal do Rio Grande—FURG) and Me. Mariana Martins – FURG for sampling support. We are grateful to Fundação de Amparo a Pesquisa do Estado de São Paulo – FAPESP for financial support through the project granted to F. Mendonça #2017/17605-3. B.L.S.F. was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil, Finance Code 001.Fellowship for R.R.D was provided by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP 2017/02420-8). We also sincerely thank three anonymous reviewers and the editor whose suggestions helped improve and clarify this manuscript.
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This study was supported by grants from the Fundação de Amparo a Pesquisa do Estado de São Paulo – FAPESP to F. Mendonça (#2017/17605-3) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES (Master’s degree fellowship to I. Bunholi).
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IVB, RRD and FFM conceived the ideas. MMR, JMC, MG, SG, RHAF provided sampling. IVB carried out laboratory work. IVB and BLSF analyzed the data. IVB led the writing of the first draft. All authors contributed to manuscript revision.
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Bunholi, I.V., da Silva Ferrette, B.L., Domingues, R.R. et al. Multilocus phylogeography of the endemic and endangered angular angelshark (Squatina guggenheim) in the Southwest Atlantic Ocean. Hydrobiologia 849, 2177–2192 (2022). https://doi.org/10.1007/s10750-022-04855-3
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DOI: https://doi.org/10.1007/s10750-022-04855-3