10.5061/DRYAD.N722G4D3
Mariani, Stefano
University College Dublin
Coscia, Ilaria
University College Dublin
Vogiatzi, Emmanouella
Kotoulas, Georgios
Hellenic Centre for Marine Research
Tsigenopoulos, Costas S.
Hellenic Centre for Marine Research
Data from: Exploring neutral and adaptive processes in expanding
populations of gilthead sea bream, Sparus aurata L., in the North-East
Atlantic
Dryad
dataset
2011
Sparus aurata
2011-10-28T15:54:42Z
2011-10-28T15:54:42Z
en
https://doi.org/10.1038/hdy.2011.120
62315 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Recent studies in empirical population genetics have highlighted the
importance of taking into account both neutral and adaptive genetic
variation in characterizing microevolutionary dynamics. Here we explore
the genetic population structure and the footprints of selection in four
populations of the warm-temperate coastal fish, the gilthead sea bream
(Sparus aurata), whose recent northward expansion has been linked to
climate change. Samples were collected at four Atlantic locations,
including Spain, Portugal, France and the South of Ireland, and
genetically assayed using a suite of species-specific markers, including
15 putatively neutral microsatellites and 23 Expressed Sequence Tag-linked
(ESTs) markers, as well as a portion of the mitochondrial DNA (mtDNA)
Control Region. Two of the putatively neutral markers, Bld-10 and Ad-10,
bore signatures of strong directional selection, particularly in the newly
established Irish population, though the potential 'surfing
effect' of rare alleles at the edge of the expansion front was also
considered. Analyses after the removal of these loci suggest low but
significant population structure likely affected by some degree of gene
flow counteracting random genetic drift. No signal of historic divergence
was detected at mtDNA. BLAST searches conducted with all 38 markers used
failed to identify specific genomic regions associated to adaptive
functions. However, the availability of genomic resources for this
commercially valuable species is rapidly increasing, bringing us closer to
the understanding of the interplay between selective and neutral
evolutionary forces, shaping population divergence of an expanding species
in a heterogeneous milieu.
Saurata_Alleles_DryadMicrosatellites' alleles
North-East Atlantic