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Strong population structure but no equilibrium yet: Genetic connectivity and phylogeography in the kelp Saccharina latissima (Laminariales, Phaeophyta) Luttikhuizen, P.C.; van den Heuvel, F.H.M.; Rebours, C.; Witte, H.J.; van Bleijswijk, J.D.L.; Timmermans, K. (2018). Strong population structure but no equilibrium yet: Genetic connectivity and phylogeography in the kelp Saccharina latissima (Laminariales, Phaeophyta). Ecol. Evol. 8(8): 4265-4277. https://doi.org/10.1002/ece3.3968 Bijhorende data: https://doi.org/10.4121/uuid:07ca0913-55ae-418f-9767-05eafc3e9817 https://www.ncbi.nlm.nih.gov/nuccore/MF447855 https://www.ncbi.nlm.nih.gov/nuccore/MF447856 https://www.ncbi.nlm.nih.gov/nuccore/MF447857 https://www.ncbi.nlm.nih.gov/nuccore/MF447858 https://www.ncbi.nlm.nih.gov/nuccore/MF447859 https://www.ncbi.nlm.nih.gov/nuccore/MF447860 https://www.ncbi.nlm.nih.gov/nuccore/MF447861 In: Ecology and Evolution. John Wiley & Sons: Chichester. ISSN 2045-7758; e-ISSN 2045-7758

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Author keywords

aquaculture; connectivity; conservation genetics; phylogeography; population genetics-empirical

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Auteurs		Top
Luttikhuizen, P.C. van den Heuvel, F.H.M. Rebours, C.	Witte, H.J. van Bleijswijk, J.D.L. Timmermans, K.

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Abstract

Kelp aquaculture is globally developing steadily as human food source, along with other applications. One of the newer crop species is Saccharina latissima, a northern hemisphere kelp inhabiting temperate to arctic rocky shores. To protect and document its natural genetic variation at the onset of this novel aquaculture, as well as increase knowledge on its taxonomy and phylogeography, we collected new genetic data, both nuclear and mitochondrial, and combined it with previous knowledge to estimate genetic connectivity and infer colonization history. Isolation‐with‐migration coalescent analyses demonstrate that gene flow among the sampled locations is virtually nonexistent. An updated scenario for the origin and colonization history of S. latissima is developed as follows: We propose that the species (or species complex) originated in the northwest Pacific, crossed to the northeast Pacific in the Miocene, and then crossed the Bering Strait after its opening ~5.5 Ma into the Arctic and northeast Atlantic. It subsequently crossed the Atlantic from east to west. During the Pleistocene, it was compressed in the south with evidence for northern refugia in Europe. Postglacial recolonization led to secondary contact in the Canadian Arctic. Saccharina cichorioides is shown to probably belong to the S. latissima species complex and to derive from ancestral populations in the Asian North Pacific. Our novel approach of comparing inferred gene flow based on coalescent analysis versus Wright's island model suggests that equilibrium levels of differentiation have not yet been reached in Europe and, hence, that genetic differentiation is expected to increase further if populations are left undisturbed.

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