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RESEARCH ARTICLE Open Access Travelling in time with networks: Revealing
 

Summary: RESEARCH ARTICLE Open Access
Travelling in time with networks: Revealing
present day hybridization versus ancestral
polymorphism between two species of brown
algae, Fucus vesiculosus and F. spiralis
Yann Moalic1
, Sophie Arnaud-Haond1*
, CÚcile Perrin2
, Gareth A Pearson2
, Ester A Serrao2
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

  

Source: Alberto, Filipe - Centro de Ciencias do Mar, Universidade do Algarve

 

Collections: Environmental Sciences and Ecology; Biology and Medicine