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Sexual Reproduction of the Black Sea Diatom Climaconeis scalaris (Brébisson) E.J. Cox

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Abstract—

The paper reports a process of sexual reproduction in the Black Sea diatom Climaconeis scalaris (Brébisson) E.J. Cox, 1982, initiated in laboratory conditions. A crossing system of this species allows both homo- and heterothallic reproduction. The fertilization is allogamous. Diploid mother gametangial cells secreted mucilage, forming a mucilage track, while actively gliding relative to each other. Each gametangium in a pair produced two elongated, cylindrical round-ended haploid gametes, which were largely morphologically and behaviorally isogamous. The division of the protoplast of the gametangial cell occurred in the transapical plane without the rearrangement of gametes. Growing auxospores were located parallel to the parent frustules. The research produced data on changes in the cell size, number of chloroplasts, and the position of cardinal points in the life cycle of the examined species.

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Funding

This work was supported as a part of research funded by the government within the task Study of Fundamental Physical, Physicobiochemical, Reproductive, Populational, and Behavioral Characteristics in Marine Hydrobionts, state registration no. АААА-А19-119012490045-0.

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Authors and Affiliations

  1. Vyazemsky Karadag Scientific Station, Natural Reserve of the Russian Academy of Sciences, Branch of the Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences, 298188, Feodosia, Russia

    O. I. Davidovich & N. A. Davidovich

  2. Institute of Marine and Environmental Sciences, University of Szczecin, 70-383, Szczecin, Poland

    N. A. Davidovich, R. Gastineau & A. Witkowski

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  1. O. I. Davidovich
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  2. N. A. Davidovich
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  3. R. Gastineau
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  4. A. Witkowski
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Correspondence to O. I. Davidovich.

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Conflict of interest. The authors declare that they have no conflict of interest.

Statement on the welfare of animals. This article does not contain any studies involving animals performed by any of the authors.

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Translated by E. Kuznetsova

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Davidovich, O.I., Davidovich, N.A., Gastineau, R. et al. Sexual Reproduction of the Black Sea Diatom Climaconeis scalaris (Brébisson) E.J. Cox. Moscow Univ. Biol.Sci. Bull. 74, 200–206 (2019). https://doi.org/10.3103/S0096392519040035

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  • DOI: https://doi.org/10.3103/S0096392519040035

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