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.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Hargeby A,Stoltz J,Johansson Jdoi
10.1111/j.1420-9101.2004.00837.xkeywords:
subject
Has Abstractpub_date
2005-05-01 00:00:00pages
713-21issue
3eissn
1010-061Xissn
1420-9101pii
JEB837journal_volume
18pub_type
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