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Parallelism and historical contingency during rapid ecotype divergence in an isopod

Eroukhmanoff, Fabrice LU ; Hargeby, A.; Arnberg, N. N.; Hellgren, O.; Bensch, Staffan LU and Svensson, Erik LU (2009) In Journal of Evolutionary Biology 22(5). p.1098-1110
Abstract
Recent studies on parallel evolution have focused on the relative role of selection and historical contingency during adaptive divergence. Here, we study geographically separate and genetically independent lake populations of a freshwater isopod (Asellus aquaticus) in southern Sweden. In two of these lakes, a novel habitat was rapidly colonized by isopods from a source habitat. Rapid phenotypic changes in pigmentation, size and sexual behaviour have occurred, presumably in response to different predatory regimes. We partitioned the phenotypic variation arising from habitat ('selection': 81-94%), lake ('history': 0.1-6%) and lake x habitat interaction ('unique diversification': 0.4-13%) for several traits. There was a limited role for... (More)
Recent studies on parallel evolution have focused on the relative role of selection and historical contingency during adaptive divergence. Here, we study geographically separate and genetically independent lake populations of a freshwater isopod (Asellus aquaticus) in southern Sweden. In two of these lakes, a novel habitat was rapidly colonized by isopods from a source habitat. Rapid phenotypic changes in pigmentation, size and sexual behaviour have occurred, presumably in response to different predatory regimes. We partitioned the phenotypic variation arising from habitat ('selection': 81-94%), lake ('history': 0.1-6%) and lake x habitat interaction ('unique diversification': 0.4-13%) for several traits. There was a limited role for historical contingency but a strong signature of selection. We also found higher phenotypic variation in the source populations. Phenotype sorting during colonization and strong divergent selection might have contributed to these rapid changes. Consequently, phenotypic divergence was only weakly influenced by historical contingency. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
pigmentation, historical contingency, adaptive radiation, mating propensity, evolution, parallel, phenotype sorting
in
Journal of Evolutionary Biology
volume
22
issue
5
pages
1098 - 1110
publisher
John Wiley & Sons
external identifiers
  • wos:000265252100017
  • scopus:65249163605
ISSN
1420-9101
DOI
10.1111/j.1420-9101.2009.01723.x
language
English
LU publication?
yes
id
ed0e08f0-0a4d-4b9f-b433-2480416220e4 (old id 1400256)
date added to LUP
2009-06-15 14:52:17
date last changed
2017-01-29 03:32:36
@article{ed0e08f0-0a4d-4b9f-b433-2480416220e4,
  abstract     = {Recent studies on parallel evolution have focused on the relative role of selection and historical contingency during adaptive divergence. Here, we study geographically separate and genetically independent lake populations of a freshwater isopod (Asellus aquaticus) in southern Sweden. In two of these lakes, a novel habitat was rapidly colonized by isopods from a source habitat. Rapid phenotypic changes in pigmentation, size and sexual behaviour have occurred, presumably in response to different predatory regimes. We partitioned the phenotypic variation arising from habitat ('selection': 81-94%), lake ('history': 0.1-6%) and lake x habitat interaction ('unique diversification': 0.4-13%) for several traits. There was a limited role for historical contingency but a strong signature of selection. We also found higher phenotypic variation in the source populations. Phenotype sorting during colonization and strong divergent selection might have contributed to these rapid changes. Consequently, phenotypic divergence was only weakly influenced by historical contingency.},
  author       = {Eroukhmanoff, Fabrice and Hargeby, A. and Arnberg, N. N. and Hellgren, O. and Bensch, Staffan and Svensson, Erik},
  issn         = {1420-9101},
  keyword      = {pigmentation,historical contingency,adaptive radiation,mating propensity,evolution,parallel,phenotype sorting},
  language     = {eng},
  number       = {5},
  pages        = {1098--1110},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Evolutionary Biology},
  title        = {Parallelism and historical contingency during rapid ecotype divergence in an isopod},
  url          = {http://dx.doi.org/10.1111/j.1420-9101.2009.01723.x},
  volume       = {22},
  year         = {2009},
}