Erratum — Effect of environmental stress on fluctuating asymmetry in certain morphological traits in Drosophila ananassae: nutrition and larval crowding

2008 ◽  
Vol 86 (9) ◽  
pp. 1084-1084 ◽  
Author(s):  
C. Vishalakshi ◽  
B. N. Singh
Keyword(s):  
Environmental Stress ◽  
Fluctuating Asymmetry ◽  
Morphological Traits ◽  
Drosophila Ananassae ◽  
Larval Crowding

Effect of environmental stress on fluctuating asymmetry in certain morphological traits in Drosophila ananassae: nutrition and larval crowding

2008 ◽  
Vol 86 (5) ◽  
pp. 427-437 ◽  
Author(s):  
C. Vishalakshi ◽  
B. N. Singh
Keyword(s):  
Genetic Variability ◽  
Environmental Stress ◽  
Fluctuating Asymmetry ◽  
Morphological Traits ◽  
Larval Density ◽  
Drosophila Ananassae ◽  
Developmental Stress ◽  
Significant Difference ◽  
Larval Crowding ◽  
Asymmetry Measures

The association of fluctuating asymmetry and phenotypic and genetic variability with environmental stress was investigated using poor nutrition and larval density as stresses on 10 recently collected isofemale lines of Drosophila ananassae Doleschall, 1858. Trait means for different morphological traits were reduced by stress, whereas phenotypic and genetic variability increased. The levels of fluctuating asymmetry and positional fluctuating asymmetry were similar in flies reared on poor and standard media. In constrast, there is a significant difference in both asymmetry measures in the flies reared at different larval densities for all traits. However, when asymmetry values across all traits were combined into a single index, composite fluctuating asymmetry, significant differences were found in males and females reared at different larval densities but not under nutritional stress. Moreover, composite fluctuating asymmetry is higher in males than in females, suggesting that males are more vulnerable to developmental stress. The results suggest that trait means are more sensitive to stress than fluctuating-symmetry measures and that the effect of stress is trait- and sex-specific. Generalizations based on the use of fluctuating asymmetry as an indicator of environmental stress in D. ananassae should therefore be used with caution.

Fluctuating asymmetry in certain morphological traits in laboratory populations of Drosophila ananassae

Genome ◽  
2006 ◽  
Vol 49 (7) ◽  
pp. 777-785 ◽  
Author(s):  
C Vishalakshi ◽  
B N Singh
Keyword(s):  
Fluctuating Asymmetry ◽  
Morphological Traits ◽  
Composite Index ◽  
Developmental Instability ◽  
Drosophila Ananassae ◽  
Developmental Stress ◽  
Phenotypic Quality ◽  
Laboratory Populations ◽  
Males And Females ◽  
Sexual Traits

Fluctuating asymmetry (FA, subtle random deviations from perfect bilateral symmetry) is often used as a measure of developmental instability (DI), which results from perturbations in developmental pathways caused by genetic or environmental stressors. During the present study, we estimated FA in 5 morphological traits, viz. wing length (WL), wing to thorax ratio (W:T), sternopleural bristle number (SBN), sex-comb tooth number (SCTN), and ovariole number (ON) in 18 laboratory populations of Drosophila ananassae. FA levels of measured traits differed significantly among populations except for SBN (in males and females) and W:T ratio (in females). Positional fluctuating asymmetry (PFA), a sensitive measure of DI, also varied significantly among the populations for SBN in females and SCTN in males. Interestingly, both males and females were similar for nonsexual traits. However, when FA across all traits (sexual and nonsexual) was combined into a single composite index (CFA), significant differences were found for both populations and sexes. Males showed higher CFA values than females, suggesting that males are more prone to developmental perturbations. The magnitude of FA differed significantly among traits, being lowest for nonsexual traits (SBN, WL, W:T ratio) and highest for sexual traits (SCTN and ON). The trait size of sexual traits (SCTN and ON) was positively correlated with their asymmetry. The possible reasons for variation in FA both among traits and among populations, and the usefulness of FA as an indicator of developmental stress and phenotypic quality in D. ananassae are discussed.Key words: fluctuating asymmetry, developmental instability, morphological traits, laboratory populations, D. ananassae.

scholarly journals Fluctuating Asymmetry and Developmental Instability, a Guide to Best Practice

Symmetry ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 9
Author(s):  
John H. Graham
Keyword(s):  
Measurement Error ◽  
Best Practices ◽  
Environmental Stress ◽  
Fluctuating Asymmetry ◽  
Best Practice ◽  
Developmental Instability ◽  
The Past ◽  
Size Scaling ◽  
Research Designs

Best practices in studies of developmental instability, as measured by fluctuating asymmetry, have developed over the past 60 years. Unfortunately, they are haphazardly applied in many of the papers submitted for review. Most often, research designs suffer from lack of randomization, inadequate replication, poor attention to size scaling, lack of attention to measurement error, and unrecognized mixtures of additive and multiplicative errors. Here, I summarize a set of best practices, especially in studies that examine the effects of environmental stress on fluctuating asymmetry.

scholarly journals Fluctuating Asymmetry as a Method of Assessing Environmental Stress in Two Predatory Carabid Species within Mediterranean Agroecosystems

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1890
Author(s):  
Lara Ivanković Tatalović ◽  
Barbara Anđelić ◽  
Mišel Jelić ◽  
Tomislav Kos ◽  
Hugo A. Benítez ◽  
...  
Keyword(s):  
Environmental Stress ◽  
Pest Management ◽  
Fluctuating Asymmetry ◽  
Agricultural Practices ◽  
Bilateral Symmetry ◽  
Carabid Beetles ◽  
Species Response ◽  
Olive Groves ◽  
Development Stability ◽  
Different Levels

Fluctuating asymmetry (FA) is used in assessing the effect of environmental stress on the development stability of individuals by measuring small random deviations from perfect bilateral symmetry. Here, we checked for FA on two predatory carabid beetles, Pterostichus melas and Poecilus koyi, in order to evaluate species response to agricultural practices within Mediterranean agroecosystems, as well as FA as a method. The samples were collected in vineyards and olive groves, both under integrated pest management (IPM) and ecological pest management (EPM), and in pristine habitats in the Mediterranean region of Croatia. Geometric morphometrics (GMMs) were used to analyze the pronotum and abdomen shape variations and left–right asymmetries of each population. In respect to the FA measurements, analyzed species responded differently, with P. koyi displaying a lower intensity of FA than P. melas. On the other hand, P. melas beetles from vineyards showed a higher intensity of FA compared with populations from pristine habitats and olive groves. Accordingly, FA pointed out olive groves as potentially less adverse habitats to predatory carabids, keeping in mind the different levels of asymmetry between the two species. Our study singled out P.melas as a more suitable species for further research, in the effect that different agricultural practices can have their impact on non-target invertebrates analyzed by measuring the FA.

scholarly journals Fluctuating Asymmetry and Environmental Stress: Understanding the Role of Trait History

PLoS ONE ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. e57966 ◽  
Author(s):  
Greet De Coster ◽  
Stefan Van Dongen ◽  
Phillista Malaki ◽  
Muchai Muchane ◽  
Angelica Alcántara-Exposito ◽  
...  
Keyword(s):  
Environmental Stress ◽  
Fluctuating Asymmetry

Fluctuating asymmetry in molar dimensions and discrete morphological traits in Pima Indians

1983 ◽  
Vol 61 (4) ◽  
pp. 437-445 ◽  
Author(s):  
John F. Noss ◽  
G. Richard Scott ◽  
Rosario H. Yap Potter ◽  
Albert A. Dahlberg
Keyword(s):  
Fluctuating Asymmetry ◽  
Morphological Traits ◽  
Pima Indians

Patterns of herbivory and leaf morphology in two Mexican hybrid oak complexes: Importance of fluctuating asymmetry as indicator of environmental stress in hybrid plants

2018 ◽  
Vol 90 ◽  
pp. 164-170 ◽  
Author(s):  
Pablo Cuevas-Reyes ◽  
Armando Canché-Delgado ◽  
Yurixhi Maldonado-López ◽  
G. Wilson Fernandes ◽  
Ken Oyama ◽  
...  
Keyword(s):  
Environmental Stress ◽  
Fluctuating Asymmetry ◽  
Leaf Morphology ◽  
Hybrid Plants
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