Travelling in time with networks: Revealing present day hybridization versus ancestral polymorphism between two species of brown algae, Fucus vesiculosus and F. spiralis

Type Article
Date 2011-01
Language English
Author(s) Moalic Yann1, Arnaud-Haond SophieORCID1, Perrin Cecile2, Pearson Gareth A.2, Serrao Ester A.2
Affiliation(s) 1 : IFREMER, Inst Francais Rech Exploitat Mer, Ctr Brest, F-29280 Plouzane, France.
2 : Univ Algarve, CIMAR, CCMAR, P-8005139 Faro, Portugal.
Source Bmc Evolutionary Biology (1471-2148) (Biomed Central Ltd), 2011-01 , Vol. 11 , P. 1-13
DOI 10.1186/1471-2148-11-33
WOS© Times Cited 18
Abstract Background: Hybridization or divergence between sympatric sister species provides a natural laboratory to study speciation processes. The shared polymorphism in sister species may either be ancestral or derive from hybridization, and the accuracy of analytic methods used thus far to derive convincing evidence for the occurrence of present day hybridization is largely debated. Results: Here we propose the application of network analysis to test for the occurrence of present day hybridization between the two species of brown algae Fucus spiralis and F. vesiculosus. Individual-centered networks were analyzed on the basis of microsatellite genotypes from North Africa to the Pacific American coast, through the North Atlantic. Two genetic distances integrating different time steps were used, the Rozenfeld (RD; based on alleles divergence) and the Shared Allele (SAD; based on alleles identity) distances. A diagnostic level of genotype divergence and clustering of individuals from each species was obtained through RD while screening for exchanges through putative hybridization was facilitated using SAD. Intermediate individuals linking both clusters on the RD network were those sampled at the limits of the sympatric zone in Northwest Iberia. Conclusion: These results suggesting rare hybridization were confirmed by simulation of hybrids and F2 with directed backcrosses. Comparison with the Bayesian method STRUCTURE confirmed the usefulness of both approaches and emphasized the reliability of network analysis to unravel and study hybridization
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Moalic Yann, Arnaud-Haond Sophie, Perrin Cecile, Pearson Gareth A., Serrao Ester A. (2011). Travelling in time with networks: Revealing present day hybridization versus ancestral polymorphism between two species of brown algae, Fucus vesiculosus and F. spiralis. Bmc Evolutionary Biology, 11, 1-13. Publisher's official version : https://doi.org/10.1186/1471-2148-11-33 , Open Access version : https://archimer.ifremer.fr/doc/00035/14600/