Diatom teratological forms and environmental alterations: a review

Falasco, Elisa; Bona, Francesca; Badino, Guido; Hoffmann, Lucien; Éctor, Luc

doi:10.1007/s10750-008-9687-3

Cited by 169 publications

(96 citation statements)

References 167 publications

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“…Indeed, diatom teratological forms in unstable microhabitats are quite common (Falasco et al 2009). For instance, rusHFortH et al (1984) noticed abnormalities in the horse-shoe area (or "sinus") in Planothidium lanceolatum (BréBisson ex kützInG) lanGe-Bertalot collected from walls in lava tubes.…”

Section: Discussionmentioning

confidence: 99%

Nupela troglophila sp. nov., an aerophilous diatom (Bacillariophyta) from the Bossea cave (NW Italy), with notes on its ecology

Falasco¹,

Bona²,

Isaia³

et al. 2015

Fottea

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Nupela troglophila sp. nov. is described from epilithic and epiphytic samples collected around the artificial lighting system in the Bossea cave, SW Alps (NW Italy). The morphological features of the new species are described and documented through light microscopy and scanning electron microscopy analysis. A comparison with morphologically similar taxa is provided. Nupela troglophila belongs to the group of the small, elliptical-lanceolate species of the genus Nupela. The key feature that distinguishes it from all the other taxa belonging to this genus is the shape of the distal raphe fissures, always laying on the valvar surface, strongly deflected on the same side, but never reaching the valve mantle. The ecological preferences of the most abundant diatom species are explored through the ecological optimum calculation and the Outlying Mean Index (OMI) analysis. Within the Bossea cave, N. troglophila seems to prefer humid and warm sites. The highest abundance was reached on wet walls characterized by low light conditions. Nupela troglophila was generally associated with Humidophila pyrenaica that showed the same pattern of distribution in the cave and similar relative abundance. On the contrary, N. troglophila showed its lowest densities when Humidophila contenta was abundant. Until now, N. troglophila has been recorded only in the type locality.

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Section: Discussionmentioning

confidence: 99%

Nupela troglophila sp. nov., an aerophilous diatom (Bacillariophyta) from the Bossea cave (NW Italy), with notes on its ecology

Falasco¹,

Bona²,

Isaia³

et al. 2015

Fottea

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“…Taxonomic identification mainly followed Lavoie et al [34]. Diatom frustule deformations were noted and classified as (i) irregular valve shape, (ii) irregular raphe, (iii) irregular striae, (iv) mixed [35].…”

Section: Water Chemistry and Diatom Assemblage Analysesmentioning

confidence: 99%

Freshwater Diatoms as Indicators of Combined Long-Term Mining and Urban Stressors in Junction Creek (Ontario, Canada)

et al. 2018

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Sudbury (Ontario, Canada) has a long mining history that has left the region with a distinctive legacy of environmental impacts. Several actions have been undertaken since the 1970s to rehabilitate this deteriorated environment, in both terrestrial and aquatic ecosystems. Despite a marked increase in environmental health, we show that the Junction Creek system remains under multiple stressors from present and past mining operations, and from urban-related pressures such as municipal wastewater treatment plants, golf courses and stormwater runoff. Water samples have elevated metal concentrations, with values reaching up to 1 mg·L −1 Ni, 40 µg·L −1 Zn, and 0.5 µg·L −1 Cd. The responses of diatoms to stressors were observed at the assemblage level (metal tolerant species, nutrient-loving species), and at the individual level through the presence of teratologies (abnormal diatom frustules). The cumulative criterion unit (CCU) approach was used as a proxy for metal toxicity to aquatic life and suggested elevated potential for toxicity at certain sites. Diatom teratologies were significantly less frequent at sites with CCU values <1, suggesting "background" metal concentrations as compared to sites with higher CCU values. The highest percentages of teratologies were observed at sites presenting multiple types of environmental pressures.

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“…Does FA (or even DA) increase during successive vegetative divisions, thereby resulting in accumulating irregularities in the shape of the siliceous frustules? It has been shown that teratogenic morphological asymmetry of diatom frustules in natural habitats is often related to chemical contamination, as well as resulting from physical stress factors [24], features that have been used in various biomonitoring and ecological surveys of freshwater and marine ecosystems [24][25][26]. Separation and quantification of FA, which is directly related to developmental instabilities from DA, which represents the systematic asymmetry of populations, might therefore be useful in environmental applications of diatom morphology.…”

Section: Introductionmentioning

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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Diatom teratological forms and environmental alterations: a review

Abstract: The foremost feature of a diatom is the species-specific ornamentation of the silicon cell wall,

Cited by 169 publications

References 167 publications

Nupela troglophila sp. nov., an aerophilous diatom (Bacillariophyta) from the Bossea cave (NW Italy), with notes on its ecology

Nupela troglophila sp. nov., an aerophilous diatom (Bacillariophyta) from the Bossea cave (NW Italy), with notes on its ecology

Freshwater Diatoms as Indicators of Combined Long-Term Mining and Urban Stressors in Junction Creek (Ontario, Canada)

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

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