Inbreeding and developmental stability in three-spined sticklebacks (Gasterosteus aculeatus L.)

Mazzi, Dominique; Largiadèr, Carlo R.; Bakker, Theo C. M.

doi:10.1038/sj.hdy.6800138

Cited by 20 publications

(19 citation statements)

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“…However, formal tests – accounting for the on average lower heterozygosity in pond populations – failed to find association between heterozygosity and FA across the populations. This finding is not completely surprising, as some other studies also found that heterozygosity had a weak, or no effect on FA [57-60]. However, given the fact heterozygosity and habitat type are tightly associated in our study, their independent effects on FA cannot be fully disentangled.…”

Section: Discussionsupporting

confidence: 65%

High levels of fluctuating asymmetry in isolated stickleback populations

et al. 2012

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BackgroundFluctuating 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).ResultsPond 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.ConclusionsThe 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.

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Section: Discussionsupporting

confidence: 65%

High levels of fluctuating asymmetry in isolated stickleback populations

et al. 2012

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“…Surprisingly, studies made on replicate populations of sticklebacks (popular models of ecological genetics research) in this context have been conspicuously scarce until lately (but see: Mazzi et al, 2002;Melhis et al, 2012). For instance, the genetically depauperate pond populations of nine-spined sticklebacks (Shikano et al, 2010;Trokovic et al, 2012) would provide good models to study variation in segregation and drift loads in isolated replicate populations not subject to confounding effects of gene flow.…”

Section: Conservation Concerns and Valuesmentioning

confidence: 99%

Lakes and ponds as model systems to study parallel evolution

Merilä

2013

J Limnol

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“…Recently, however, asymmetry of morphological traits has been documented (Almeida et al, 2008;Lutterschmidt et al, 2016). Bilateral asymmetry, in individual and population levels of fish, was found to relate positively to a wide range of abiotic, biotic and genetic stresses (Allenbach et al, 1999;Franco et al, 2002;Estes et al, 2006), and could be sensitive to different levels of individual density in captive conditions (Leary et al, 1991) or increases under genetic stresses such as hybridization, inbreeding and loss of genetic variation (Mazzi et al, 2002;Dongen, 2006), particularly in reared fishes (Palma et al, 2001;Fessehaye et al, 2007). surprisingly we noticed some alteration in external morphology and level of 'left-right asymmetry', where some morphological characters (metric and meristic) of left and right sides differed asymmetrically in some specimens.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Morphological Asymmetry in Three Species of the Genus <i>Hydrocynus</i> from the White Nile in Sudan

Mohamed

Al-Awadi²

2018

ija

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The present study aimed to determine and evaluate the level of fluctuating asymmetry (FA) of morphological characters for three species of Hydrocynus from the White Nile. In H. vittatus 41% of morphological characters fluctuated to the right side and 59% to left side. In H. brevis 50% fluctuated to right and 50% to left side, while in H. forskalii 34% fluctuated to right and 66% fluctuated to left side. More scales were recorded along the lateral line on the right side of H. vittatus and H. brevis compared to H. forskalii, while more gill rakers were recorded on the left side of H. vittatus. The smallest asymmetry index was found for PVFL of the three species and the largest index was found for POL of H. brevis. Mean asymmetry index was (3.5%) in H. forskalii, (5.1%) and (4.9%) in H. vittatus and H. brevis, respectively. Absolute asymmetry values were significantly correlated with character size for the number of lateral line scales, head length, pectoral fin length and ventral fin length (P>0.05) and highly correlated for snout length and caudal peduncle length (P>0.001) in the three species. Correlations between means of bilateral characters and body size were significant (P>0.05) for the head length, pelvic fin length and pectoral spine length of the three species. This study is the first of its kind in species of the Nile fish. The present result can be a base line for further study of fluctuating asymmetry in fish and as indicators to detect the level of pollutants in the Nile and the condition of the environment and the organisms.

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Inbreeding and developmental stability in three-spined sticklebacks (Gasterosteus aculeatus L.)

Cited by 20 publications

References 50 publications

High levels of fluctuating asymmetry in isolated stickleback populations

High levels of fluctuating asymmetry in isolated stickleback populations

Lakes and ponds as model systems to study parallel evolution

Evaluating Morphological Asymmetry in Three Species of the Genus <i>Hydrocynus</i> from the White Nile in Sudan

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