On the identity of the rare Fragilaria subconstricta (Fragilariaceae), with Fragilaria species forming ribbon-like colonies shortly reconsidered

Heudre, David; Wetzel, Carlos E.; Moreau, Laura; Vijver, Bart Van de; Éctor, Luc

doi:10.5091/plecevo.2019.1619

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…The following species are discussed, grouping the different taxa under their proposed accepted name: 2021b). An important difference between the two is the presence of two rimoportulae per valve in F. capucina, whereas F. rumpens has only one (Heudre et al 2019;Van de Vijver et al 2021b), excluding all possible synonyms. These species can also be distinguished based on their valve dimensions, with F. capucina having a slightly larger valve width than F. rumpens (3.5-4 µm vs. 3.0-3.5 µm) and a lower stria density (15-16 vs. 19-20 in 10 µm).…”

Section: Resultsmentioning

confidence: 99%

Analysis of the Fragilaria rumpens complex (Fragilariaceae, Bacillariophyta) with the description of two new species

Vijver¹,

Williams²,

Schuster³

et al. 2022

Fottea

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The former Synedra rumpens complex has long puzzled diatom taxonomists. In the nineteenth century, many infraspecific taxa were described as varieties or forms of S. rumpens. In the present study, type material of Synedra rumpens and several infraspecific taxa such as S. rumpens var. fragilarioides and S. familiaris f. parva and f. major was investigated using LM and SEM observations. For comparison, the original material of several other relevant diatom taxa (such as Fragilaria perdelicatissima, F. spinaspeciosa, Synedra campyla, S. vaucheriae var. distans) was also analysed. The results based on these comparisons show that all infraspecific taxa should be split from Fragilaria rumpens. Fragilaria campyla is a new combination within the genus Fragilaria with F. parva and S. (rumpens var.?) familiaris f. major as synonyms. Fragilaria scotica is likewise a new combination in Fragilaria. Fragilaria metcalfeana is proposed as new name for Synedra familiaris var. neogena. The analysis of F. distans and F. fragilarioides confirmed their conspecificity, with F. fragilarioides having priority as name. Finally, two new species, F. pseudofamiliaris Van de Vijver, T.M.Schuster, Kusber et D.M.Williams sp. nov. and F. bahlsiana Van de Vijver, C.E.Wetzel et Ector sp. nov. are described. Using an analysis of the associated diatom flora, the ecological preferences of each taxon are briefly discussed.

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Section: Resultsmentioning

confidence: 99%

Analysis of the Fragilaria rumpens complex (Fragilariaceae, Bacillariophyta) with the description of two new species

Vijver¹,

Williams²,

Schuster³

et al. 2022

Fottea

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“…Group (2)-harmonious with a greater human impact on the environment-was dominated by Achnanthidium minutissimum, Fragilaria subconstricta, and Encyonopsis microcephala. Only Achnanthidium minutissimum is observed in a wide range of environmental conditions, while Fragilaria subconstricta occurs in mesotrophic, slightly alkaline environments, and Encyonopsis microcephala is present in oligotrophic to slightly eutrophic conditions [38,46]. These taxa are more resistant to slight anthropopressure and a higher nutrient content than less common taxa from the third group.…”

Section: Discussionmentioning

confidence: 96%

“…Then, the slides were analyzed using an Nikon Eclipse-80i microscope, with 400 diatom valves counted. Diatom identification mainly followed [5,[31][32][33][34][35][36][37][38]. Dominants are defined here as the species occurring most frequently, with a relative abundance above 10%.…”

Section: Diatom Datamentioning

confidence: 99%

Limnological Characteristics and Diatom Dominants in Lakes of Northeastern Poland

Eliasz-Kowalska

Wojtal

2020

Diversity

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Determination of the relationships between environmental factors and diatom assemblages is usually made for several hundred lakes spread over a large area. However, the analysis of several lakes located near Lake Wigry also gives interesting results. Lakes in Wigry National Park (Poland) with broad similarity of geological origin show clear limnological, physical, and chemical differences. Here, we report on an investigation into how these dissimilarities influence diatom assemblages. Hierarchical Cluster Analysis showed that the studied lakes can be divided into three groups: (1) disharmonic, (2) harmonious with greater human impact on the environment, and (3) harmonious with a more limited human impact. The harmonious lakes could be divided into two groups that are mainly in line with the contents of the chloride and sulfates ions taken as indicative of human impacts on the environment. Overall, the three groups had different dominance structures, as reference to the Dominance Index (DI) made clear (mean values being: (1) −70.54%, (2) −72%, and (3) −54.58%, Generalized Linear Models with the categorical independent variable (group) showed significant differences between groups (for 1–3, 2–3) p value < 0.05). Lakes impacted by anthropopressure and disharmonic ones had the strongest dominance structure. More broadly, DI differences between the groups are consistent with the Species Pool Hypothesis (SPH), while studied differences can be said to result from natural geological dissimilarities, as well as disparate anthropogenic impacts.

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“…The recent revision of type material of several species of Fragilaria Lyngbye continues to elucidate the taxonomic identity and boundaries of many widely cited taxa (e.g. Tuji & Williams 2006a, b, 2008a, b, Tuji 2007, Heudre et al 2019, Van de Vijver et al 2020a, b, c, 2021a. This clarification has triggered the description of new taxa from different continents (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fragilaria odeloucaensis sp. nov. (Bacillariophyta, Fragilariaceae) a diatom from temporary streams in southern Portugal

et al. 2022

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A new species of araphid diatom is described from a temporary stream in southern Portugal, Fragilaria odeloucaensis sp. nov., which belongs to the group of Fragilaria with widely linear to lanceolate valve outline, spaced striae, lacking spines, and with well-developed apical pore fields. The new taxon can be distinguished based on five unique features within this group, the lanceolate valves with capitate apices, the zig-zagged axial area, the central area with squared fascia, the apical pore fields clearly sunken into the valve apices and the heterovalvar frustules (with respect to striae distancing). Ecological features of the type locality and an additional sampling point where the new species was found are given, together with a discussion of the taxonomic position of the new species within Fragilaria, and the approach used herein for the identification of diagnostic features. This approach includes a detailed analysis of the internal and external characteristics of the axial area-virgae-striae complex, central area, apical pore fields and differences among valves of the same frustule, in addition to the traditional valve shape and morphometric features.

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On the identity of the rare Fragilaria subconstricta (Fragilariaceae), with Fragilaria species forming ribbon-like colonies shortly reconsidered

Cited by 14 publications

References 4 publications

Analysis of the Fragilaria rumpens complex (Fragilariaceae, Bacillariophyta) with the description of two new species

Analysis of the Fragilaria rumpens complex (Fragilariaceae, Bacillariophyta) with the description of two new species

Limnological Characteristics and Diatom Dominants in Lakes of Northeastern Poland

Fragilaria odeloucaensis sp. nov. (Bacillariophyta, Fragilariaceae) a diatom from temporary streams in southern Portugal

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