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Contemporary parallel diversification, antipredator adaptations and phenotypic integration in an aquatic isopod.

Eroukhmanoff, Fabrice LU and Svensson, Erik LU (2009) In PLoS ONE 4(7).
Abstract
It is increasingly being recognized that predation can be a strong diversifying agent promoting ecological divergence. Adaptations against different predatory regimes can emerge over short periods of time and include many different traits. We studied antipredator adaptations in two ecotypes of an isopod (Asellus aquaticus) that have, diverged in parallel in two Swedish lakes over the last two decades. We quantified differences in escape speed, morphology and behavior for isopods from different ecotypes present in these lakes. Isopods from the source habitat (reed) coexist with mainly invertebrate predators. They are more stream-profiled and have higher escape speeds than isopods in the newly colonized stonewort habitat, which has higher... (More)
It is increasingly being recognized that predation can be a strong diversifying agent promoting ecological divergence. Adaptations against different predatory regimes can emerge over short periods of time and include many different traits. We studied antipredator adaptations in two ecotypes of an isopod (Asellus aquaticus) that have, diverged in parallel in two Swedish lakes over the last two decades. We quantified differences in escape speed, morphology and behavior for isopods from different ecotypes present in these lakes. Isopods from the source habitat (reed) coexist with mainly invertebrate predators. They are more stream-profiled and have higher escape speeds than isopods in the newly colonized stonewort habitat, which has higher density of fish predators. Stonewort isopods also show more cautious behaviors and had higher levels of phenotypic integration between coloration and morphological traits than the reed isopods. Colonization of a novel habitat with a different predation regime has thus strengthened the correlations between pigmentation and morphology and weakened escape performance. The strong signature of parallelism for these phenotypic traits indicates that divergence is likely to be adaptive and is likely to have been driven by differences in predatory regimes. Furthermore, our results indicate that physical performance, behavior and morphology can change rapidly and in concert as new habitats are colonized. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
PLoS ONE
volume
4
issue
7
publisher
Public Library of Science
external identifiers
  • wos:000268035100005
  • scopus:67650286867
ISSN
1932-6203
DOI
10.1371/journal.pone.0006173
language
English
LU publication?
yes
id
0e025460-ac7a-4bd8-9e9e-e54536d2f417 (old id 1453250)
date added to LUP
2009-09-01 09:20:55
date last changed
2017-10-01 04:22:47
@article{0e025460-ac7a-4bd8-9e9e-e54536d2f417,
  abstract     = {It is increasingly being recognized that predation can be a strong diversifying agent promoting ecological divergence. Adaptations against different predatory regimes can emerge over short periods of time and include many different traits. We studied antipredator adaptations in two ecotypes of an isopod (Asellus aquaticus) that have, diverged in parallel in two Swedish lakes over the last two decades. We quantified differences in escape speed, morphology and behavior for isopods from different ecotypes present in these lakes. Isopods from the source habitat (reed) coexist with mainly invertebrate predators. They are more stream-profiled and have higher escape speeds than isopods in the newly colonized stonewort habitat, which has higher density of fish predators. Stonewort isopods also show more cautious behaviors and had higher levels of phenotypic integration between coloration and morphological traits than the reed isopods. Colonization of a novel habitat with a different predation regime has thus strengthened the correlations between pigmentation and morphology and weakened escape performance. The strong signature of parallelism for these phenotypic traits indicates that divergence is likely to be adaptive and is likely to have been driven by differences in predatory regimes. Furthermore, our results indicate that physical performance, behavior and morphology can change rapidly and in concert as new habitats are colonized.},
  articleno    = {e6173},
  author       = {Eroukhmanoff, Fabrice and Svensson, Erik},
  issn         = {1932-6203},
  language     = {eng},
  number       = {7},
  publisher    = {Public Library of Science},
  series       = {PLoS ONE},
  title        = {Contemporary parallel diversification, antipredator adaptations and phenotypic integration in an aquatic isopod.},
  url          = {http://dx.doi.org/10.1371/journal.pone.0006173},
  volume       = {4},
  year         = {2009},
}