Title
Asymmetry in threespine stickleback lateral plates Asymmetry in threespine stickleback lateral plates
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
London ,
Subject
Biology
Source (journal)
Journal of zoology. - London
Volume/pages
289(2013) :4 , p. 279-284
ISSN
0952-8369
0022-5460
ISI
000316679700006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The study of asymmetry can provide insights into genetic and environmental influences on organismal development. Directional asymmetry (DA) can be either adaptive or non-adaptive, whereas fluctuating asymmetry (FA) defined as small non-directional departures from symmetry in bilateral traits is thought to be an indicator of genetic or environmental stress experienced during development. Using data from 28 European populations, we assessed the degree of DA and FA in the lateral plates of threespine sticklebacks Gasterosteus aculeatus and surveyed the direction of DA and differences in levels of DA and FA in different habitat types (viz. marine, lake and river populations). DA differed between habitats, with right-biased DA found in the marine populations and no directional bias found in lake and river populations. Differences in DA among habitats may be a by-product of habitat-specific developmental instability resulting in asymmetry, or it may indicate habitat-specific differences in selection against/for symmetry, as has been proposed in previous research of sticklebacks. Also, the presence of FA varied depending upon habitat type, but it also depended on plate morph a variable confounded with the habitat effect. While we cannot rule out factors such as stress as a cause of population differences in FA, it may also simply be a by-product of other evolutionary processes (e.g. lateral plate number reduction) without functional basis.
E-info
https://repository.uantwerpen.be/docman/iruaauth/fa08c7/14cfe450df3.pdf
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