Cyclotella atomus Hust. var. atomus in Arch. Hydrobiol. 15: 143, pl. 9, figs 1-4. 1938.

Bilous, Olena P., Genkal, Sergey I., Zimmermann, Jonas, Kusber, Wolf-Henning & Jahn, Regine, 2021, Centric diatom diversity in the lower part of the Southern Bug river (Ukraine): the transitional zone at Mykolaiv city, PhytoKeys 178, pp. 31-69 : 31

publication ID	https://dx.doi.org/10.3897/phytokeys.178.64426
persistent identifier	https://treatment.plazi.org/id/8A17A8A8-9F4C-5C1D-8660-45680D1A8083
treatment provided by	PhytoKeys by Pensoft (2021-05-20 20:16:17, last updated 2024-11-26 05:22:16)
scientific name	Cyclotella atomus Hust. var. atomus in Arch. Hydrobiol. 15: 143, pl. 9, figs 1-4. 1938.
status

Treatment

Morphological description.

Frustule low-cylindrical, central part of the valve is slightly tangentially undulated, 3.6-5.6 μm in diameter, clear boundary between regional and central zones absent, 10-15 striae in 10 μm, and a central process (Fig. 6B, C View Figure 6 ).

Ecology.

Euplanktonic species, that may exist in marine, brackish or nearshore areas and freshwaters, indicating eutraphentic, α-mesosaprobous conditions and often associated with polluted, warm nutrient-rich water, however particularly tolerating high total phosphorus loads (Denys 1991; Van Dam et al. 1994; Yang et al. 2005; Lowe 2015), halophilic, alkaliphilic, tolerates higher ion concentrations and frequent osmotic stress as well as high temperature conditions and turbulence ( Krammer and Lange-Bertalot 2000).

Distribution.

Valves were found at all investigated sites of the Southern Bug during this research (Table 1 View Table 1 ). For Ukrainian territory, it has been reported for the Dnipro River ( Maystrova et al. 2007).

In general, Cyclotella atomus is a cosmopolitan species ( Krammer and Lange-Bertalot 2000), widespread in freshwater and marine environments in North America, Europe, and Asia, and has also been recorded from Argentina and South Africa ( Poulíčková 1993; Medioli and Brooks 2003; Tanimura et al. 2004; Yang et al. 2005; Wojtal and Kwandrans 2006; Genkal et al. 2020).

References

Genkal, SI, Kulikovskiy, MS, Kuznetsova, IV, 2020. Modern freshwater centric diatom algae in Russia [Sovremennye presnovodnye centricheskie diatomovye vodorosli Rossii]. Filigran, Yaroslavl

Krammer, K, Lange-Bertalot, H, 2000. Bacillariophyceae. Bd. 2., Teil 3: Centrales, Fragilariaceae, Eunotiaceae. Suesswasserflora von Mitteleuropa. Spektrum Akademischer Verlag, Heidelberg, Berlin

Lowe, R, 2015. Cyclotella atomus. Diatoms of North America. Retrieved March 08, 2020. https://diatoms.org/species/cyclotella_atomus

Maystrova, NV, Genkal, SI, Scherbak, VI, Semenyuk, NE, 2007. Centrophyceae in the upper section of the Kanev water reservoirs (Ukraine). Algologia 17 (4): 467 - 475

Medioli, BE, Brooks, GR, 2003. Diatom and thecamoebian signatures of Red River (Manitoba and North Dakota) floods: Data collected from the 1997 and 1999 spring freshets. Journal of Paleolimnology 29 (3): 353 - 386, DOI: https://doi.org/10.1023/A:1023965403770

Poulickova, A, 1993. Ecological study of seasonal maxima of centric diatoms. Archiv fuer Hydrobiologie (Supplement 96): 85-106.

Tanimura, Y, Naqumo, T, Kato, M, 2004. A new variety of Cyclotella atomus from Tokyo Bay, Japan: C. atomus var. marina var. nov. Bulletin of the National Science Museum Series C 30: 5 - 11

Van Dam, H, Mertens, A, Sinkeldam, S, 1994. A coded checklist and ecological indicator values of freshwater diatoms from The Netherlands. Netherlands Journal of Aquatic Ecology 28 (1): 117 - 133, DOI: https://doi.org/10.1007/BF02334251

Wojtal, AZ, Kwandrans, J, 2006. Diatoms of the Wyzyna Krakowsko-Czestochowska upland (S. Poland) - Coscinodiscophyceae (Thalassiosirophycidae). Polish Botanical Journal 51 (2): 177 - 207

Yang, X, Dong, X, Gao, G, Pan, H, Wu, J, 2005. Relationship between surface sediment diatoms and summer water quality in shallow lakes of the middle and lower reaches of the Yangtze River. Journal of Integrative Plant Biology 47 (2): 153 - 164, DOI: https://doi.org/10.1111/j.1744-7909.2005.00035.x

Figures

Figure 6. SEM (A-F, H) and LM images (G) of species found in the transitional zone at Mykolaiv city, valve views: A Stephanodiscus minutulus with arrows shown marginal and central fultoportulae B, C Cyclotella atomus var. atomus with arrows shown marginal and central fultoportulae D-F Cyclotella atomus var. gracilis with arrows shown marginal and central fultoportulae on D picture, only central fultoportula on E and central fultoportula and alveolae on (F) G Cyclotella choctawhatcheeana with arrow shown central fultoportulae H Cyclotella cryptica with arrows shown marginal and central fultoportulae. Scale bars: 3 μm (B, C); 4 μm (D, F); 5 μm (A, E, H); 10 μm (G).