Marine pollution effects on the southern surf crab Ovalipes trimaculatus (Crustacea: Brachyura: Polybiidae) in Patagonia Argentina

Lezcano, Aníbal H.; Quiroga, María Laura Rojas; Liberoff, Ana Laura; Molen, Silvina Van Der

doi:10.1016/j.marpolbul.2014.09.038

Cited by 25 publications

(11 citation statements)

References 60 publications

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“…On the other hand, independence of FA levels on the life cycle stage of cells highlights its potential for use in environmental assessments based on the morphology of diatom populations. It has previously been shown that FA in aquatic organisms correlates with environmental pollutants that influence the developmental processes [39,44,45]. Falasco et al [24] also showed that increased occurrence of teratological forms in natural populations of diatoms could be linked to a variety of anthropogenic pollutants.…”

Section: Discussionmentioning

confidence: 99%

Morphometric Asymmetry of Frustule Outlines in the Pennate Diatom Luticola poulickovae (Bacillariophyceae)

Woodard

Neustupa

2016

Symmetry

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Abstract:Side orientation of cells is usually ambiguous in unicellular organisms, making it impossible to separate components of directional asymmetry (DA) and fluctuating asymmetry (FA). However, frustules of the diatom Luticola poulickovae have biradially symmetric outlines, and their central areas bear ornamentation that is asymmetric across the apical axis. The goal of this study was to explore differentiation of morphometric asymmetry across the apical axis into DA and FA components. Is there detectable DA of the valve outlines of two L. poulickovae strains that may be related to the asymmetric central areas? Given that the life cycle of diatoms involves cell-size diminution, and cell shape is strongly affected by allometry, we also explored the question of whether asymmetry is correlated with cell size. The extent of symmetric variation among individuals in each strain, as well as DA and FA across the apical axis, were quantified using two Procrustes ANOVA models. The results revealed no correlation of either total asymmetry or FA with valve size. DA was significant and considerably more pronounced than FA in both strains, indicating that there is previously unknown systematic asymmetry of valve outlines of L. poulickovae, which may be related to the asymmetry of its central area.

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Section: Discussionmentioning

confidence: 99%

Morphometric Asymmetry of Frustule Outlines in the Pennate Diatom Luticola poulickovae (Bacillariophyceae)

Woodard

Neustupa

2016

Symmetry

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“…Its increased levels in particular populations of a studied species might indicate a role for developmental stress in the morphogenesis of the semicells. In organisms inhabiting water ecosystems, increased developmental instability resulting in asymmetric deviations in morphology of the symmetric body parts has been found to strongly correlate with higher concentrations of environmental stressors, such as organic and inorganic pollutants [64–66]. In Micrasterias species, such analysis could be particularly intriguing with regard to known toxic effects of certain heavy metals such as Cd, Cr, or Al on intracellular architecture, metabolism, and cytomorphogenesis [67–69].…”

Section: Discussionmentioning

confidence: 99%

Asymmetry and integration of cellular morphology in Micrasterias compereana

Neustupa

2017

BMC Evol Biol

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BackgroundUnicellular green algae of the genus Micrasterias (Desmidiales) have complex cells with multiple lobes and indentations, and therefore, they are considered model organisms for research on plant cell morphogenesis and variation. Micrasterias cells have a typical biradial symmetric arrangement and multiple terminal lobules. They are composed of two semicells that can be further differentiated into three structural components: the polar lobe and two lateral lobes. Experimental studies suggested that these cellular parts have specific evolutionary patterns and develop independently. In this study, different geometric morphometric methods were used to address whether the semicells of Micrasterias compereana are truly not integrated with regard to the covariation of their shape data. In addition, morphological integration within the semicells was studied to ascertain whether individual lobes constitute distinct units that may be considered as separate modules. In parallel, I sought to determine whether the main components of morphological asymmetry could highlight underlying cytomorphogenetic processes that could indicate preferred directions of variation, canalizing evolutionary changes in cellular morphology.ResultsDifferentiation between opposite semicells constituted the most prominent subset of cellular asymmetry. The second important asymmetric pattern, recovered by the Procrustes ANOVA models, described differentiation between the adjacent lobules within the quadrants. Other asymmetric components proved to be relatively unimportant. Opposite semicells were shown to be completely independent of each other on the basis of the partial least squares analysis analyses. In addition, polar lobes were weakly integrated with adjacent lateral lobes. Conversely, higher covariance levels between the two lateral lobes of the same semicell indicated mutual interconnection and significant integration between these parts.Conclusions Micrasterias cells are composed of several successively disintegrated parts. These integration patterns concurred with presumed scenarios of morphological evolution within the lineage. In addition, asymmetric differentiation in the shape of the lobules involves two major patterns: asymmetry across the isthmus axis and among the adjacent lobules. Notably, asymmetry among the adjacent lobules may be related to evolutionary differentiation among species, but it may also point out developmental instability related to environmental factors.Electronic supplementary materialThe online version of this article (doi:10.1186/s12862-016-0855-1) contains supplementary material, which is available to authorized users.

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“…Also, the asymmetry scores are not in units of Procrustes distance, and therefore are not easily related to other measures of shape variation in the data. The asymmetry measure using Mahalanobis distance is used in an increasing number of studies, comparing levels of fluctuating asymmetry between groups or correlating it with factors that might influence developmental instability, both for structures with matching symmetry [77,124] and with object symmetry [90,98,108,137,253].…”

Section: Individual Measures Of Fluctuating Asymmetry Of Shapementioning

confidence: 99%

“…Several studies found greater fluctuating asymmetry in disturbed than in undisturbed habitats for skull shape of voles [250], in areas of worse rather than better climatic suitability for skull shape of Akodon rodents [370], in urban than in rural habitats for head shape of lizards [106], in polluted than unpolluted habitats for crab carapace shape [253] and for mandible shape of shrews [371]. Studies of the larval mentum and adult wings in chironomid midges showed that pollution in the rearing environment had no or only limited effects on fluctuating asymmetry [130,131] or that there was more fluctuating asymmetry in offspring reared in unpolluted sediment in the laboratory than in the parental generation collected from polluted sediment in the field [103].…”

Section: Developmental Instability Of Shape In Relation To Stress Andmentioning

confidence: 99%

Analyzing Fluctuating Asymmetry with Geometric Morphometrics: Concepts, Methods, and Applications

2015

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Approximately two decades after the first pioneering analyses, the study of shape asymmetry with the methods of geometric morphometrics has matured and is a burgeoning field. New technology for data collection and new methods and software for analysis are widely available and have led to numerous applications in plants and animals, including humans. This review summarizes the concepts and morphometric methods for studying asymmetry of shape and size. After a summary of mathematical and biological concepts of symmetry and asymmetry, a section follows that explains the methods of geometric morphometrics and how they can be used to analyze asymmetry of biological structures. Geometric morphometric analyses not only tell how much asymmetry there is, but also provide information about the patterns of covariation in the structure under study. Such patterns of covariation in fluctuating asymmetry can provide valuable insight about the developmental basis of morphological integration, and have become important tools for evolutionary developmental biology. The genetic basis of fluctuating asymmetry has been studied from empirical and theoretical viewpoints, but serious challenges remain in this area. There are many promising areas for further research that are only little explored at present.

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Marine pollution effects on the southern surf crab Ovalipes trimaculatus (Crustacea: Brachyura: Polybiidae) in Patagonia Argentina

Cited by 25 publications

References 60 publications

Morphometric Asymmetry of Frustule Outlines in the Pennate Diatom Luticola poulickovae (Bacillariophyceae)

Morphometric Asymmetry of Frustule Outlines in the Pennate Diatom Luticola poulickovae (Bacillariophyceae)

Asymmetry and integration of cellular morphology in Micrasterias compereana

Analyzing Fluctuating Asymmetry with Geometric Morphometrics: Concepts, Methods, and Applications

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