Pubblicazione scientifica

Do North Atlantic eels show parallel patterns of spatially varying selection?

FILONE TECNOLOGICO	TEMA
produzione e cattura

RIASSUNTO

Background

The two North Atlantic eel species, the European and the American eel, represent an ideal system in which to study parallel selection patterns due to their sister species status and the presence of ongoing gene flow. A panel of 80 coding-gene SNPs previously analyzed in American eel was used to genotype European eel individuals (glass eels) from 8 sampling locations across the species distribution. We tested for single-generation signatures of spatially varying selection in European eel by searching for elevated genetic differentiation using FST-based outlier tests and by testing for significant associations between allele frequencies and environmental variables.

Results

We found signatures of possible selection at a total of 11 coding-gene SNPs. Candidate genes for local selection constituted mainly genes with a major role in metabolism as well as defense genes. Contrary to what has been found for American eel, only 2 SNPs in our study correlated with differences in temperature, which suggests that other explanatory variables may play a role. None of the genes found to be associated with explanatory variables in European eel showed any correlations with environmental factors in the previous study in American eel.

Conclusions

The different signatures of selection between species could be due to distinct selective pressures associated with the much longer larval migration for European eel relative to American eel. The lack of parallel selection in North Atlantic eels could also be due to most phenotypic traits being polygenic, thus reducing the likelihood of selection acting on the same genes in both species.

DATA

Data di pubblicazione: 20/06/2014

AUTORI

ULRIK MALENE G
PUJOLAR JOSE MARTIN
FERCHAUD ANNE-LAURE
JACOBSEN MAGNUS W
ALS THOMAS D
GAGNAIRE PIERRE ALEXANDRE
FRYDENBERG JANE
BØCHER PEDER K
JONSSON BJARNI
BERNATCHEZ LOUIS
HANSEN MICHAEL M

ENTE DI AFFERENZA

ISEM (Institut des Sciences de l’Evolution Montpellier) Université Montpellier II 34095 Montpellier France
DEPT BIOSCIENCE AARHUS UNIV NY MUNKEGADE
NATL INST AQUATIC RESOURCES TECH UNIV DENMARK
DEPT BIOMEDICINE HUMAN GENETICS AARHUS UNIV DK 8000 AARHUS C DENMARK
BIOPOL MARINE BIOLOGY & BIOTECHNOLOGY CTR EINBUASTIGUR 2 IS545 SKAGASTROND ICELAND
IBIS INST BIOLOGIE INTEGRATIVE & SYS UNIV LAVAL G1V 0A6 QUEBEC CANADA

RIVISTA

BMC Evolutionary Biology, 14, 138

IMPACT FACTOR

3,020

indietro