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Locally differentiated cryptic pigmentation in the freshwater isopod Asellus aquaticus

Hargeby, Anders LU ; Stoltz, J and Johansson, Jonas LU (2005) In Journal of Evolutionary Biology 18(3). p.713-721
Abstract
A repeated pattern of background colour matching in animals is an indication that pigmentation may be cryptic. Here, we examine the relationship between pigmentation of the freshwater isopod Asellus aquaticus and background darkness in 29 lakes, wetlands and ponds in Southern Sweden. The results show that Asellus pigmentation was correlated with substrate darkness across all localities. In seven localities, in which two contrasting substrate types were noted, Asellus populations were differentiated with respect to pigmentation. These findings thus provide phenomenological support for cryptic pigmentation in Asellus. Pigmentation generally increased with body size, but the relationship between pigmentation and size differed among... (More)
A repeated pattern of background colour matching in animals is an indication that pigmentation may be cryptic. Here, we examine the relationship between pigmentation of the freshwater isopod Asellus aquaticus and background darkness in 29 lakes, wetlands and ponds in Southern Sweden. The results show that Asellus pigmentation was correlated with substrate darkness across all localities. In seven localities, in which two contrasting substrate types were noted, Asellus populations were differentiated with respect to pigmentation. These findings thus provide phenomenological support for cryptic pigmentation in Asellus. Pigmentation generally increased with body size, but the relationship between pigmentation and size differed among localities, possibly as a result of differences in correlational selection on pigmentation and size. Selection thus appears to have resulted in local differentiation over a small spatial scale, even within lakes and wetlands. This differentiation is a likely cause behind elevated phenotype variation noted in localities with two substrate types, suggesting that habitat heterogeneity promotes genetic diversity. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Evolutionary Biology
volume
18
issue
3
pages
713 - 721
publisher
John Wiley & Sons
external identifiers
  • wos:000228396800022
  • pmid:15842500
  • scopus:18544374320
ISSN
1420-9101
DOI
10.1111/j.1420-9101.2004.00837.x
language
English
LU publication?
yes
id
b8e636d5-178c-4203-b889-eae504eb21be (old id 146487)
date added to LUP
2007-06-28 13:53:27
date last changed
2017-10-29 03:24:44
@article{b8e636d5-178c-4203-b889-eae504eb21be,
  abstract     = {A repeated pattern of background colour matching in animals is an indication that pigmentation may be cryptic. Here, we examine the relationship between pigmentation of the freshwater isopod Asellus aquaticus and background darkness in 29 lakes, wetlands and ponds in Southern Sweden. The results show that Asellus pigmentation was correlated with substrate darkness across all localities. In seven localities, in which two contrasting substrate types were noted, Asellus populations were differentiated with respect to pigmentation. These findings thus provide phenomenological support for cryptic pigmentation in Asellus. Pigmentation generally increased with body size, but the relationship between pigmentation and size differed among localities, possibly as a result of differences in correlational selection on pigmentation and size. Selection thus appears to have resulted in local differentiation over a small spatial scale, even within lakes and wetlands. This differentiation is a likely cause behind elevated phenotype variation noted in localities with two substrate types, suggesting that habitat heterogeneity promotes genetic diversity.},
  author       = {Hargeby, Anders and Stoltz, J and Johansson, Jonas},
  issn         = {1420-9101},
  language     = {eng},
  number       = {3},
  pages        = {713--721},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Evolutionary Biology},
  title        = {Locally differentiated cryptic pigmentation in the freshwater isopod Asellus aquaticus},
  url          = {http://dx.doi.org/10.1111/j.1420-9101.2004.00837.x},
  volume       = {18},
  year         = {2005},
}