Spatial versus temporal structure: Implications of inter-haul variation and relatedness in the North-east Atlantic spurdog Squalus acanthias

James Thorburn; Rosie Jones; Francis Neat; Cecilia Pinto; Victoria Bendall; Stuart Hetherington; David Mark Bailey; Noble Leslie; Cath Jones

doi:10.1002/aqc.2922

Spatial versus temporal structure: Implications of inter-haul variation and relatedness in the North-east Atlantic spurdog Squalus acanthias

James Thorburn^* (Corresponding Author), Rosie Jones, Francis Neat, Cecilia Pinto, Victoria Bendall, Stuart Hetherington, David Mark Bailey, Noble Leslie, Cath Jones^* (Corresponding Author)

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

6 Downloads (Pure)

Abstract

Micropopulation processes, such as gene flow, operating within geographic regions are often poorly understood, despite their potential to affect stock structure and sustainability. This is especially true for highly mobile species, such as elasmobranchs, where the potential for spatial overlap of regional populations is increased as a result of greater movement capabilities. A lack of information on these processes means that management plans rarely consider spatio-temporal structure. Spurdog (Squalus acanthias) are globally distributed throughout temperate regions yet there is an apparent lack of gene flow between ocean basins. In the North-east Atlantic there is little work on gene flow within the region, which is currently managed as a single stock that is estimated to be at 19% compared with 1905. Some evidence from this region suggests population processes that have the potential to cause structuring. The population structure of the North-east Atlantic spurdog was investigated using an 828-bp fragment of the mitochondrial DNA control region and seven focal polymorphic microsatellite markers. Samples from 295 individuals from eight locations throughout UK waters were used in this study. Overall, mitochondrial sequences suggest some regional differentiation. Genetic diversity was comparable with that reported in previous studies of spurdog. Haplotype diversity (0.782–1.000) is amongst the highest observed for an elasmobranch. Microsatellite markers suggest that a high level of relatedness was responsible for regional population structuring. There was no apparent spatial structure after removal of ‘full sibling’ relationships. Inter-haul variation from Celtic Sea samples is suggestive of subpopulations and aggregation events, which may have important implications for fisheries conservation of this and other elasmobranch species.

Original language	English
Pages (from-to)	1167-1180
Number of pages	14
Journal	Aquatic Conservation: Marine and Freshwater Ecosystems
Volume	28
Issue number	5
Early online date	2 Aug 2018
DOIs	https://doi.org/10.1002/aqc.2922
Publication status	Published - 1 Oct 2018

Bibliographical note

ACKNOWLEDGEMENTS
Our thanks go to Gordon Goldie, Willie Kennedy, Stuart Cresswell, and Trevor Ryder for assisting with sample collection, and to Margaret Wallace for her help with all stages of labwork. This work received funding from the MASTS pooling initiative (The Marine Alliance for Science and Technology for Scotland), and their support is gratefully acknowledged. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. The spurdog tissue samples collected by CEFAS were part of the European Fisheries Fund project ‘Shark By‐Watch UK’ and two DEFRA‐funded projects: MF047 ‘Spurdog, porbeagle and common skate by‐catch and discard reduction’ and M5201a ‘Assessing the survivability of bycaught porbeagle and spurdog and furthering our understanding of their movement patterns in UK marine waters’. We also thank the anonymous reviewers whose comments helped improve this article.

FUNDING
This work received funding from the MASTS pooling initiative (The Marine Alliance for Science and Technology for Scotland), and their support is gratefully acknowledged. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. The spurdog tissue samples collected by CEFAS were part of the European Fisheries Fund project ‘Shark By‐Watch UK’ and two DEFRA‐funded projects: MF047 ‘Spurdog, porbeagle and common skate by‐catch and discard reduction’ and M5201a ‘Assessing the survivability of bycaught porbeagle and spurdog and furthering our understanding of their movement patterns in UK marine waters’.

Keywords

coastal
distribution
elasmobranch management
fish
fishing
genetic structure
ocean
relatedness
social interactions

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/aqc.2922Licence: Unspecified

Accepted Manuscript
This is the peer reviewed version of the following article: Thorburn J, Jones R, Neat F, et al. Spatial versus temporal structure: Implications of inter‐haul variation and relatedness in the North‐east Atlantic spurdog Squalus acanthias. Aquatic Conserv: Mar Freshw Ecosyst. 2018;28:1167–1180., which has been published in final form at https://doi.org/10.1002/aqc.2922. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Accepted author manuscript, 997 KBLicence: Unspecified

Cite this

Thorburn, J., Jones, R., Neat, F., Pinto, C., Bendall, V., Hetherington, S., Bailey, D. M., Leslie, N., & Jones, C. (2018). Spatial versus temporal structure: Implications of inter-haul variation and relatedness in the North-east Atlantic spurdog Squalus acanthias. Aquatic Conservation: Marine and Freshwater Ecosystems, 28(5), 1167-1180. https://doi.org/10.1002/aqc.2922

Spatial versus temporal structure: Implications of inter-haul variation and relatedness in the North-east Atlantic spurdog Squalus acanthias. / Thorburn, James (Corresponding Author); Jones, Rosie; Neat, Francis et al.
In: Aquatic Conservation: Marine and Freshwater Ecosystems, Vol. 28, No. 5, 01.10.2018, p. 1167-1180.

Research output: Contribution to journal › Article › peer-review

Thorburn, J, Jones, R, Neat, F, Pinto, C, Bendall, V, Hetherington, S, Bailey, DM, Leslie, N & Jones, C 2018, 'Spatial versus temporal structure: Implications of inter-haul variation and relatedness in the North-east Atlantic spurdog Squalus acanthias', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 28, no. 5, pp. 1167-1180. https://doi.org/10.1002/aqc.2922

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abstract = "Micropopulation processes, such as gene flow, operating within geographic regions are often poorly understood, despite their potential to affect stock structure and sustainability. This is especially true for highly mobile species, such as elasmobranchs, where the potential for spatial overlap of regional populations is increased as a result of greater movement capabilities. A lack of information on these processes means that management plans rarely consider spatio-temporal structure. Spurdog (Squalus acanthias) are globally distributed throughout temperate regions yet there is an apparent lack of gene flow between ocean basins. In the North-east Atlantic there is little work on gene flow within the region, which is currently managed as a single stock that is estimated to be at 19% compared with 1905. Some evidence from this region suggests population processes that have the potential to cause structuring. The population structure of the North-east Atlantic spurdog was investigated using an 828-bp fragment of the mitochondrial DNA control region and seven focal polymorphic microsatellite markers. Samples from 295 individuals from eight locations throughout UK waters were used in this study. Overall, mitochondrial sequences suggest some regional differentiation. Genetic diversity was comparable with that reported in previous studies of spurdog. Haplotype diversity (0.782–1.000) is amongst the highest observed for an elasmobranch. Microsatellite markers suggest that a high level of relatedness was responsible for regional population structuring. There was no apparent spatial structure after removal of {\textquoteleft}full sibling{\textquoteright} relationships. Inter-haul variation from Celtic Sea samples is suggestive of subpopulations and aggregation events, which may have important implications for fisheries conservation of this and other elasmobranch species.",

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note = "ACKNOWLEDGEMENTS Our thanks go to Gordon Goldie, Willie Kennedy, Stuart Cresswell, and Trevor Ryder for assisting with sample collection, and to Margaret Wallace for her help with all stages of labwork. This work received funding from the MASTS pooling initiative (The Marine Alliance for Science and Technology for Scotland), and their support is gratefully acknowledged. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. The spurdog tissue samples collected by CEFAS were part of the European Fisheries Fund project {\textquoteleft}Shark By‐Watch UK{\textquoteright} and two DEFRA‐funded projects: MF047 {\textquoteleft}Spurdog, porbeagle and common skate by‐catch and discard reduction{\textquoteright} and M5201a {\textquoteleft}Assessing the survivability of bycaught porbeagle and spurdog and furthering our understanding of their movement patterns in UK marine waters{\textquoteright}. We also thank the anonymous reviewers whose comments helped improve this article. FUNDING This work received funding from the MASTS pooling initiative (The Marine Alliance for Science and Technology for Scotland), and their support is gratefully acknowledged. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. The spurdog tissue samples collected by CEFAS were part of the European Fisheries Fund project {\textquoteleft}Shark By‐Watch UK{\textquoteright} and two DEFRA‐funded projects: MF047 {\textquoteleft}Spurdog, porbeagle and common skate by‐catch and discard reduction{\textquoteright} and M5201a {\textquoteleft}Assessing the survivability of bycaught porbeagle and spurdog and furthering our understanding of their movement patterns in UK marine waters{\textquoteright}.",

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Spatial versus temporal structure: Implications of inter-haul variation and relatedness in the North-east Atlantic spurdog Squalus acanthias

Abstract

Bibliographical note

Keywords

UN SDGs

Access to Document

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Cite this