Advanced

Rapid adaptive divergence between ecotypes of an aquatic isopod inferred from F-Q analysis.

Eroukhmanoff, Fabrice LU ; Hargeby, Anders LU and Svensson, Erik LU (2009) In Molecular Ecology 18(23). p.4912-4923
Abstract
Abstract Divergent natural selection is often thought to be the principal factor driving phenotypic differentiation between populations. We studied two ecotypes of the aquatic isopod Asellus aquaticus which have diverged in parallel in several Swedish lakes. In these lakes, isopods from reed belts along the shores colonized new stonewort stands in the centre of the lakes and rapid phenotypic changes in size and pigmentation followed after colonization. We investigated if selection was likely to be responsible for these observed phenotypic changes using indirect inferences of selection (F(ST)-Q(ST) analysis). Average Q(ST) for seven quantitative traits were higher than the average F(ST) between ecotypes for putatively neutral markers... (More)
Abstract Divergent natural selection is often thought to be the principal factor driving phenotypic differentiation between populations. We studied two ecotypes of the aquatic isopod Asellus aquaticus which have diverged in parallel in several Swedish lakes. In these lakes, isopods from reed belts along the shores colonized new stonewort stands in the centre of the lakes and rapid phenotypic changes in size and pigmentation followed after colonization. We investigated if selection was likely to be responsible for these observed phenotypic changes using indirect inferences of selection (F(ST)-Q(ST) analysis). Average Q(ST) for seven quantitative traits were higher than the average F(ST) between ecotypes for putatively neutral markers (AFLPs). This suggests that divergent natural selection has played an important role during this rapid diversification. In contrast, the average Q(ST) between the different reed ecotype populations was not significantly different from the mean F(ST). Genetic drift could therefore not be excluded as an explanation for the minor differences between allopatric populations inhabiting the same source habitat. We complemented this traditional F(ST)-Q(ST) approach by comparing the F(ST) distributions across all loci (n = 67-71) with the Q(ST) for each of the seven traits. This analysis revealed that pigmentation traits had diverged to a greater extent and at higher evolutionary rates than size-related morphological traits. In conclusion, this extended and detailed type of F(ST)-Q(ST) analysis provides a powerful method to infer adaptive phenotypic divergence between populations. However, indirect inferences about the operation of divergent selection should be analyzed on a per-trait basis and complemented with detailed ecological information. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Molecular Ecology
volume
18
issue
23
pages
4912 - 4923
publisher
Wiley-Blackwell
external identifiers
  • wos:000271904400014
  • scopus:70449707639
ISSN
0962-1083
DOI
10.1111/j.1365-294X.2009.04408.x
language
English
LU publication?
yes
id
7f77b994-2e7e-46b9-9acb-08fafa2965cb (old id 1512434)
date added to LUP
2009-12-01 07:54:52
date last changed
2017-01-01 04:34:35
@article{7f77b994-2e7e-46b9-9acb-08fafa2965cb,
  abstract     = {Abstract Divergent natural selection is often thought to be the principal factor driving phenotypic differentiation between populations. We studied two ecotypes of the aquatic isopod Asellus aquaticus which have diverged in parallel in several Swedish lakes. In these lakes, isopods from reed belts along the shores colonized new stonewort stands in the centre of the lakes and rapid phenotypic changes in size and pigmentation followed after colonization. We investigated if selection was likely to be responsible for these observed phenotypic changes using indirect inferences of selection (F(ST)-Q(ST) analysis). Average Q(ST) for seven quantitative traits were higher than the average F(ST) between ecotypes for putatively neutral markers (AFLPs). This suggests that divergent natural selection has played an important role during this rapid diversification. In contrast, the average Q(ST) between the different reed ecotype populations was not significantly different from the mean F(ST). Genetic drift could therefore not be excluded as an explanation for the minor differences between allopatric populations inhabiting the same source habitat. We complemented this traditional F(ST)-Q(ST) approach by comparing the F(ST) distributions across all loci (n = 67-71) with the Q(ST) for each of the seven traits. This analysis revealed that pigmentation traits had diverged to a greater extent and at higher evolutionary rates than size-related morphological traits. In conclusion, this extended and detailed type of F(ST)-Q(ST) analysis provides a powerful method to infer adaptive phenotypic divergence between populations. However, indirect inferences about the operation of divergent selection should be analyzed on a per-trait basis and complemented with detailed ecological information.},
  author       = {Eroukhmanoff, Fabrice and Hargeby, Anders and Svensson, Erik},
  issn         = {0962-1083},
  language     = {eng},
  number       = {23},
  pages        = {4912--4923},
  publisher    = {Wiley-Blackwell},
  series       = {Molecular Ecology},
  title        = {Rapid adaptive divergence between ecotypes of an aquatic isopod inferred from F-Q analysis.},
  url          = {http://dx.doi.org/10.1111/j.1365-294X.2009.04408.x},
  volume       = {18},
  year         = {2009},
}