Restricted dispersal in a sea of gene flow.

Benestan, L. , Fietz, Katharina, Loiseau, N. , Guerin, P. E., Trofimenko, Elena, Rühs, Siren , Schmidt, Christina , Rath, Willi , Biastoch, Arne , Pérez-Ruzafa, A. , Baixauli, P. , Forcada, A. , Arcas, E. , Lenfant, P. , Mallol, S. , Goñi, R., Velez, L. , Höppner, M., Kininmonth, S. , Mouillot, D. , Puebla, Oscar and Manel, S. (2021) Restricted dispersal in a sea of gene flow. Proceedings of the Royal Society B: Biological Sciences, 288 (1951). Art.Nr. 20210458. DOI 10.1098/rspb.2021.0458.

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How far do marine larvae disperse in the ocean? Decades of population genetic studies have revealed generally low levels of genetic structure at large spatial scales (hundreds of kilometres). Yet this result, typically based on discrete sampling designs, does not necessarily imply extensive dispersal. Here, we adopt a continuous sampling strategy along 950 km of coast in the northwestern Mediterranean Sea to address this question in four species. In line with expectations, we observe weak genetic structure at a large spatial scale. Nevertheless, our continuous sampling strategy uncovers a pattern of isolation by distance at small spatial scales (few tens of kilometres) in two species. Individual-based simulations indicate that this signal is an expected signature of restricted dispersal. At the other extreme of the connectivity spectrum, two pairs of individuals that are closely related genetically were found more than 290 km apart, indicating long-distance dispersal. Such a combination of restricted dispersal with rare long-distance dispersal events is supported by a high-resolution biophysical model of larval dispersal in the study area, and we posit that it may be common in marine species. Our results bridge population genetic studies with direct dispersal studies and have implications for the design of marine reserve networks.

Document Type: Article
Keywords: dispersal; gene flow; isolation by distance; relatedness; marine reserves
Research affiliation: IFREMER
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-OD Ocean Dynamics
Main POF Topic: PT6: Marine Life
Refereed: Yes
Open Access Journal?: No
Publisher: The Royal Society
Related URLs:
Date Deposited: 11 Jun 2021 11:17
Last Modified: 08 Feb 2023 09:40

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