High levels of fluctuating asymmetry in isolated stickleback populations

Show full item record



Permalink

http://hdl.handle.net/10138/39162

Citation

Trokovic , N , Herczeg , G , Ab Ghani , N I , Shikano , T & Merila , J 2012 , ' High levels of fluctuating asymmetry in isolated stickleback populations ' , BMC Evolutionary Biology , vol. 12 , no. 115 , pp. - . https://doi.org/10.1186/1471-2148-12-115

Title: High levels of fluctuating asymmetry in isolated stickleback populations
Author: Trokovic, Nina; Herczeg, Gabor; Ab Ghani, Nurul Izza; Shikano, Takahito; Merila, Juha
Contributor: University of Helsinki, Biosciences
University of Helsinki, Ecology and Evolutionary Biology
University of Helsinki, Biosciences
University of Helsinki, Biosciences
University of Helsinki, Biosciences
Date: 2012-07-12
Language: eng
Number of pages: 9
Belongs to series: BMC Evolutionary Biology
ISSN: 1471-2148
URI: http://hdl.handle.net/10138/39162
Abstract: Background Fluctuating asymmetry (FA), defined as small random deviations from the ideal bilateral symmetry, has been hypothesized to increase in response to both genetic and environmental stress experienced by a population. We compared levels of FA in 12 bilateral meristic traits (viz. lateral-line system neuromasts and lateral plates), and heterozygosity in 23 microsatellite loci, among four marine (high piscine predation risk) and four pond (zero piscine predation risk) populations of nine-spined sticklebacks (Pungitius pungitius). Results Pond sticklebacks had on average three times higher levels of FA than marine fish and this difference was highly significant. Heterozygosity in microsatellite markers was on average two times lower in pond (HE ≈ 0.3) than in marine (HE ≈ 0.6) populations, and levels of FA and heterozygosity were negatively correlated across populations. However, after controlling for habitat effect on heterozygosity, levels of FA and heterozygosity were uncorrelated. Conclusions The fact that levels of FA in traits likely to be important in the context of predator evasion were elevated in ponds compared to marine populations suggests that relaxed selection for homeostasis in ponds lacking predatory fish may be responsible for the observed habitat difference in levels of FA. This inference also aligns with the observation that the levels of genetic variability across the populations did not explain population differences in levels of FA after correcting for habitat effect. Hence, while differences in strength of selection, rather than in the degree of genetic stress could be argued to explain habitat differences in levels of FA, the hypothesis that increased FA in ponds is caused by genetic stress cannot be rejected.
Subject: GASTEROSTEUS-ACULEATUS L.
DEVELOPMENTAL STABILITY
PUNGITIUS-PUNGITIUS
LATERAL-LINE
9-SPINED STICKLEBACKS
SEXUAL SELECTION
MORPHOLOGICAL DIVERGENCE
3-SPINED STICKLEBACKS
INBREEDING DEPRESSION
GENETIC ARCHITECTURE
1181 Ecology, evolutionary biology
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
Trokovic_et_al_2012.pdf 564.3Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record