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Molecular Ecology (2005) 14, 20332046 doi: 10.1111/j.1365-294X.2005.02558.x 2005 Blackwell Publishing Ltd
 

Summary: Molecular Ecology (2005) 14, 2033­2046 doi: 10.1111/j.1365-294X.2005.02558.x
© 2005 Blackwell Publishing Ltd
Blackwell Publishing, Ltd.
Genetic entities and mating system in hermaphroditic
Fucus spiralis and its close dioecious relative
F. vesiculosus (Fucaceae, Phaeophyceae)
C. R. ENGEL,* C. DAGUIN* and E. A. SERRÃO
*,CCMAR-Centre of Marine Sciences, FCMA, Universidade do Algarve, Campus de Gambelas, 8005­139 Faro, Portugal
Abstract
To date, molecular markers have not settled the question of the specific status of the
closely related, but phylogenetically unresolved, brown seaweeds, hermaphroditic
Fucus spiralis and dioecious Fucus vesiculosus, nor their propensity for natural hybridiza-
tion. To test the degree of species integrity and to assess effect of the mating system on the
population genetic structure, 288 individuals coming from parapatric (discontinuous)
and sympatric (contiguous) spatial configurations at two sites were genotyped with five
microsatellite loci. Using a Bayesian admixture analysis, our results show that F. spiralis
and F. vesiculosus comprise clearly distinct genetic entities (clusters) generally character-
ized by cosexual and unisexual individuals, respectively. Genetic diversity within each
entity suggests that F. spiralis reproduces primarily through selfing while F. vesiculosus
is characterized by an endogamous breeding regime. Nevertheless, aberrant sexual

  

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

 

Collections: Environmental Sciences and Ecology; Biology and Medicine