1 Spatial versus Temporal Structure: Implications of Inter-haul Variation and Relatedness in the North East Atlantic Spurdog Squalus acanthias. James Thorburn1*, Rosie Jones2, Francis Neat3, Cecilia Pinto2, Victoria Bendall4, Stuart Hetherington4, David Mark Bailey 5, Noble Leslie2+, Cath Jones2+** 1Scottish Oceans Institute, University of St. Andrews, Gatty Marine Laboratory, East Sands, St Andrews, KY16 8LB 2School of Biological Sciences, College of Life Sciences & Medicine, University of Aberdeen, Aberdeen, AB24 2TZ, UK 3Marine Scotland Science 4 Centre for Environment, Fisheries and Aquaculture Science 5Institute of Biodiversity Animal Health and Comparative Medicine, University of Glasgow *Author for all correspondence during publication: James Thorburn, 07793950325,
[email protected] **Author for all correspondence following publication: Cath Jones
[email protected] + joint last authors Running title: Genetic structure Squalus acanthias NEA 2 1 Abstract: 2 1) Micro-population processes, such as gene flow, operating within geographic regions 3 are often poorly understood despite their potential to impact stock structure and 4 sustainability. This is especially true for highly mobile species, such as elasmobranchs, 5 where the potential for spatial overlap of regional populations is increased due to 6 higher movement capabilities. A lack of information on these processes means 7 management plans rarely consider spatio-temporal structure. 8 2) Spurdog (Squalus acanthias) are globally distributed throughout temperate regions 9 yet there is an apparent lack of gene flow between ocean basins. In the North-east 10 Atlantic, there is little work on gene flow within the region which is currently managed 11 as a single stock that is estimated to be at 19% compared to 1905.