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Multi-generation dispersal shapes the genetic structure of the canopy-forming seaweed Ericaria amentacea syn. Cystoseira amentacea in the north-western Mediterranean Sea

2025-09-23Journal article Open access
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dc.contributor.authorReynes, Lauric
dc.contributor.authorLegrand, Térence
dc.contributor.authorBlanfuné, Aurélie
dc.contributor.authorAssis, Jorge
dc.contributor.authorThibaut, Thierry
dc.contributor.authorBottin, Lorraine
dc.date.accessioned2025-10-13T12:18:19Z
dc.date.available2025-10-13T12:18:19Z
dc.date.issued2025-09-23
dc.description.abstractCanopy-forming seaweeds, especially fucoids (Fucales, Phaeophyceae), constitute marine forests in the Mediterranean Sea that deliver key ecosystem services. However, escalating human pressures in coastal areas have led to habitat fragmentation, significantly impacting the dynamics of gene flow and evolutionary trajectories. In this study, we investigated population connectivity among 43 sites with Ericaria amentacea in the northwestern Mediterranean Sea. By integrating microsatellite genotyping and biophysical modelling, we aimed to evaluate the hypothesis that population connectivity is approximated by oceanographic connectivity, rather than coastal distance. While traditional approaches to oceanographic connectivity had focused on single-generation dispersal models, we adopted a multi-generation perspective. This involves employing a biophysical model that considers gene flow through multiple stepping-stone populations across the E. amentacea distribution and over distinct generations of dispersal. Using distance-based redundancy analysis (dbRDA), we found that multi-generation dispersal significantly contributes to genetic differentiation, surpassing the influence of coastal distance. Even so, genetic differentiation remained significant among all population pairs, suggesting that gene flow may be hindered by differential selection acting against migrants and/or obscured by the effects of local genetic drift. The latter is likely, given the species' low dispersal potential and self-compatibility, both of which promote small, spatially restricted breeding units. In addition, our results emphasized that oceanographic connectivity promoted long-distance dispersal across northern Corsica and Eastern Provence over a single generation through the drifting of fertile thalli, which might have contributed to moderate differentiation between local populations. Overall, this framework highlights the value of considering multi-generation dispersal across numerous intermediate stepping-stones for informing management strategies aimed at enhancing population connectivity and safeguarding genetic diversity in seaweeds.eng
dc.identifier.doi10.1080/09670262.2025.2554068
dc.identifier.eissn1469-4433
dc.identifier.issn0967-0262
dc.identifier.urihttp://hdl.handle.net/10400.1/27819
dc.language.isoeng
dc.peerreviewedyes
dc.publisherInforma
dc.relationFunctional Variability and Dynamics of Responses of Marine Forests to Global Change - MARFOR
dc.relation.ispartofEuropean Journal of Phycology
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectFucoids genetic structure
dc.subjectLong-distance dispersal
dc.subjectMicrosatellites
dc.subjectPopulation connectivity
dc.subjectStepping-stones
dc.titleMulti-generation dispersal shapes the genetic structure of the canopy-forming seaweed Ericaria amentacea syn. Cystoseira amentacea in the north-western Mediterranean Seaeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleFunctional Variability and Dynamics of Responses of Marine Forests to Global Change - MARFOR
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/BIODIVERSA%2F0004%2F2015/PT
oaire.citation.titleEuropean Journal of Phycology
oaire.fundingStream3599-PPCDT
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameLegrand
person.familyNameAssis
person.givenNameTérence
person.givenNameJorge
person.identifier.ciencia-idE51E-3C57-81FE
person.identifier.ciencia-id5C1D-05B6-29F7
person.identifier.orcid0000-0002-9120-5153
person.identifier.orcid0000-0002-6624-4820
person.identifier.ridGWC-4801-2022
person.identifier.ridG-9688-2012
person.identifier.scopus-author-id57211545847
person.identifier.scopus-author-id53463298700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
relation.isAuthorOfPublication44bd2127-964a-4784-8ce3-380d192b7258
relation.isAuthorOfPublicationc794f76b-9001-4ac1-913a-bb0f3aab6ef5
relation.isAuthorOfPublication.latestForDiscovery44bd2127-964a-4784-8ce3-380d192b7258
relation.isProjectOfPublication384a02ca-7ccc-4eab-ba09-5bdf6423f9d2
relation.isProjectOfPublication.latestForDiscovery384a02ca-7ccc-4eab-ba09-5bdf6423f9d2

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