Premium
CONTEMPORARY ISOLATION‐BY‐DISTANCE, BUT NOT ISOLATION‐BY‐TIME, AMONG DEMES OF EUROPEAN GRAYLING ( THYMALLUS THYMALLUS , LINNAEUS) WITH RECENT COMMON ANCESTORS
Author(s) -
Barson Nicola J.,
Haugen Thrond O.,
Vøllestad L. Asbjørn,
Primmer Craig R.
Publication year - 2009
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.2008.00554.x
Subject(s) - biology , grayling , isolation (microbiology) , zoology , ecology , arctic , bioinformatics
The development of isolation by distance (IBD) and isolation by time (IBT) was contrasted among demes of European grayling ( Thymallus thymallus ) that have diverged within the last 25 generations following colonization of a lake (Lesjaskogsvatnet). We find low but significant levels of genetic differentiation among spawning tributaries and a pattern of IBD among them. We do not, however, find evidence for IBT despite an up to four‐week difference in spawning date between “warm/early” and “cold/late” spawning demes and differences in the incubation temperatures experienced by offspring. It appears that IBD has developed more rapidly than IBT in this system and that adaptive divergence has been initiated in the absence of IBT. Although analysis of selected loci could reveal reduced recombination in parts of the genome associated with temporal divergence, our analysis of neutral genetic data suggests that IBD is a more important isolating mechanism in the early stages of adaptive divergence in European grayling.