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Title: Congruence between fine-scale genetic breaks and dispersal potential in an estuarine seaweed across multiple transition zones

Abstract

Abstract Genetic structure in biogeographical transition zones can be shaped by several factors including limited dispersal across barriers, admixture following secondary contact, differential selection, and mating incompatibility. A striking example is found in Northwest France and Northwest Spain, where the estuarine seaweed Fucus ceranoides L. exhibits sharp, regional genetic clustering. This pattern has been related to historical population fragmentation and divergence into distinct glacial refugia, followed by post-glacial expansion and secondary contact. The contemporary persistence of sharp ancient genetic breaks between nearby estuaries has been attributed to prior colonization effects (density barriers) but the effect of oceanographic barriers has not been tested. Here, through a combination of mesoscale sampling (15 consecutive populations) and population genetic data (mtIGS) in NW France, we define regional genetic disjunctions similar to those described in NW Iberia. Most importantly, using high resolution dispersal simulations for Brittany and Iberian populations, we provide evidence for a central role of contemporary hydrodynamics in maintaining genetic breaks across these two major biogeographic transition zones. Our findings further show the importance of a comprehensive understanding of oceanographic regimes in hydrodynamically complex coastal regions to explain the maintenance of sharp genetic breaks along continuously populated coastlines.

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [2];  [1]; ORCiD logo [3];
  1. CCMAR-CIMAR—Associated Laboratory, University of Algarve, Campus de Gambelas, Faro 8005-139, Portugal
  2. UMI 3614 Evolutionary Biology and Ecology of Algae, CNRS, Sciences Sorbonne Université, UC, UACH, Station Biologique de Roscoff, Roscoff Cedex, France
  3. Department of Zoology and Entomology, Rhodes University, Grahamstown 6140, South Africa
Publication Date:
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
OSTI Identifier:
1596180
Grant/Contract Number:  
SFRH/BPD/111003/2015
Resource Type:
Published Article
Journal Name:
ICES Journal of Marine Science
Additional Journal Information:
Journal Name: ICES Journal of Marine Science Journal Volume: 77 Journal Issue: 1; Journal ID: ISSN 1054-3139
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Nicastro, Katy R., Assis, Jorge, Serrão, Ester A., Pearson, Gareth A., Neiva, João, Valero, Myriam, Jacinto, Rita, Zardi, Gerardo I., and Kaplan, ed., David. Congruence between fine-scale genetic breaks and dispersal potential in an estuarine seaweed across multiple transition zones. United Kingdom: N. p., 2019. Web. doi:10.1093/icesjms/fsz179.
Nicastro, Katy R., Assis, Jorge, Serrão, Ester A., Pearson, Gareth A., Neiva, João, Valero, Myriam, Jacinto, Rita, Zardi, Gerardo I., & Kaplan, ed., David. Congruence between fine-scale genetic breaks and dispersal potential in an estuarine seaweed across multiple transition zones. United Kingdom. doi:10.1093/icesjms/fsz179.
Nicastro, Katy R., Assis, Jorge, Serrão, Ester A., Pearson, Gareth A., Neiva, João, Valero, Myriam, Jacinto, Rita, Zardi, Gerardo I., and Kaplan, ed., David. Fri . "Congruence between fine-scale genetic breaks and dispersal potential in an estuarine seaweed across multiple transition zones". United Kingdom. doi:10.1093/icesjms/fsz179.
@article{osti_1596180,
title = {Congruence between fine-scale genetic breaks and dispersal potential in an estuarine seaweed across multiple transition zones},
author = {Nicastro, Katy R. and Assis, Jorge and Serrão, Ester A. and Pearson, Gareth A. and Neiva, João and Valero, Myriam and Jacinto, Rita and Zardi, Gerardo I. and Kaplan, ed., David},
abstractNote = {Abstract Genetic structure in biogeographical transition zones can be shaped by several factors including limited dispersal across barriers, admixture following secondary contact, differential selection, and mating incompatibility. A striking example is found in Northwest France and Northwest Spain, where the estuarine seaweed Fucus ceranoides L. exhibits sharp, regional genetic clustering. This pattern has been related to historical population fragmentation and divergence into distinct glacial refugia, followed by post-glacial expansion and secondary contact. The contemporary persistence of sharp ancient genetic breaks between nearby estuaries has been attributed to prior colonization effects (density barriers) but the effect of oceanographic barriers has not been tested. Here, through a combination of mesoscale sampling (15 consecutive populations) and population genetic data (mtIGS) in NW France, we define regional genetic disjunctions similar to those described in NW Iberia. Most importantly, using high resolution dispersal simulations for Brittany and Iberian populations, we provide evidence for a central role of contemporary hydrodynamics in maintaining genetic breaks across these two major biogeographic transition zones. Our findings further show the importance of a comprehensive understanding of oceanographic regimes in hydrodynamically complex coastal regions to explain the maintenance of sharp genetic breaks along continuously populated coastlines.},
doi = {10.1093/icesjms/fsz179},
journal = {ICES Journal of Marine Science},
number = 1,
volume = 77,
place = {United Kingdom},
year = {2019},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1093/icesjms/fsz179

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