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Surfing the wave on a borrowed board: range expansion and spread of introgressed organellar genomes in the
 

Summary: Surfing the wave on a borrowed board: range expansion
and spread of introgressed organellar genomes in the
seaweed Fucus ceranoides L
JOA~ O NEIVA,* GARETH A. PEARSON,* MYRIAM VALERO and ESTER A. SERRA~ O*
*Centro de Cie^ncias do Mar, Centro de Investigac¸a~o Marinha e Ambiental--Laborato´rio Associado, Universidade do Algarve,
Gambelas, 8005-139 Faro, Portugal, Unite´ Mixte de Recherche7144, Centre National de la Recherche Scientifique / Universite´
Pierre et Marie Curie, Station Biologique de Roscoff, Place Georges-Teissier, BP 74, 29682 Roscoff Cedex, France
Abstract
For many taxa, introgression represents an important source of genetic variation, but the
specific contexts allowing locally introgressed material to spread and largely replace
native allelic lineages throughout a species range remain poorly understood. Recent
demographic-genetic simulations of spatial expansions show that the stochastic surfing
of alien alleles during range expansions may constitute a general mechanism leading to
extensive introgression, but empirical evidence remain scarce and difficult to distinguish
from selection. In this study, we report a compelling case of such a phenomenon in the
estuarine alga Fucus ceranoides. We re-assessed the phylogenetic relationships among
F. ceranoides and its marine congeners F. vesiculosus and F. spiralis using nuclear,
mitochondrial and chloroplast sequence data, and conducted a mtDNA phylogeographic
survey in F. ceranoides. Our phylogenetic analyses revealed a recent and asymmetric
introgression of a single F. vesiculosus cytoplasm into F. ceranoides. The phylogeo-

  

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

 

Collections: Environmental Sciences and Ecology; Biology and Medicine