Effects of water levels on species diversity of silica-scaled chrysophytes in large tributaries of Lake Baikal

Bessudova, Anna Yu.; Сороковикова, Л. М.; Sinyukovich, V. N.; Firsova, Alena D.; Томберг, И. В.; Likhoshway, Ye. V.

doi:10.3897/abs.6.e52840

Cited by 4 publications

(8 citation statements)

References 43 publications

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“…The various environmental conditions in the study area during the observation period favored the formation of a high species richness of scaled chrysophytes (67 species). Such a high biodiversity is comparable tot hat of the mouths of arctic rivers in Yakutia (82 species) [18], Baikal region (79 species) [56], Bolshezemelskaya tundra (75 species) [57], and the small arctic ponds near Tiksi (65 species) [58] that we have described previously. Therefore, the northern waters of East Siberia have a high…”

Section: Discussionsupporting

confidence: 80%

Small Organisms in a Large River: What Provides the High Diversity of Scaled Chrysophytes in the Ob River?

Bessudova,

Likhoshway,

Firsova

et al. 2023

Water

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Currents are one of the main factors favoring the dispersal of microscopic planktic organisms over inland lakes and rivers. Large rivers of the northern hemisphere, flowing from south to north, can increase the diversity of northern latitudes with boreal species, while high water levels and floods expand the range of ecotopes and the biodiversity of rivers. We studied the distribution of the taxonomic structure and species richness of scaled chrysophytes downstream of the Ob river—a large river in West Siberia—at the end of the high-water period (June). Methods of scanning and transmission microscopy allowed the determination of a high taxonomic richness of these organisms, 67 species in total. The species were unevenly distributed by stations, with the maximum number of species (54) occurring in a shallow still bay without current and with minimum turbidity and a small number of diatoms. The species diversity in the main current was represented mainly by ubiquitous and cosmopolitan species.Water level fall usually coincides with the end of the vegetation of many scaled chrysophytes and the formation of stomatocysts. The stomatocysts of different species may drift downstream and then germinate when they find suitable conditions at theappropriatetime. Large rivers that are subject to significant changes in water level during their hydrologicalperiodsare able to host ahigh diversity of microscopic planktic organisms. Studying this capacity may reinforce the hypothesis of an omnipresence, i.e., that “everything is everywhere”.

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Section: Discussionsupporting

confidence: 80%

Small Organisms in a Large River: What Provides the High Diversity of Scaled Chrysophytes in the Ob River?

Bessudova,

Likhoshway,

Firsova

et al. 2023

Water

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“…Rotosphaerida, Centrohelid heliozoans (this study) and silica‐scaled chrysophyta (Bessudova et al, 2015, 2017, 2018a, 2018b, 2018c, 2020) ratio in the study area. A—spring (May/May–June), B—summer (July), C—autumn (September).…”

Section: Discussionsupporting

confidence: 47%

“…The aim of this report is to expand knowledge of the autecology and zoogeography of silica‐scaled heterotrophic protists by providing a taxonomic report on their occurrence among plankton of continuous water bodies and streams of Siberia that connect the freshwater Lake Baikal and the Kara Sea. We previously described the species richness of silica‐scaled (Chrysophyceae Pascher, 1914), including colorless phagotrophic flagellates of the genera Paraphysomonas (De Saedeleer, 1930) and Clathromonas (Scoble & Cavalier‐Smith, 2014), in this large cold‐water system (Bessudova et al, 2014a, 2014b, 2015, 2017, 2018a, 2018b, 2018c, 2020; Bessudova & Likhoshway, 2017). In this paper, we describe and analyze the distribution of Rotosphaerida, Thaumatomonadida, and centrohelid heliozoans.…”

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confidence: 99%

Silica‐scaled heterotrophic protists Rotosphaerida, Thaumatomonadida, and Centroplasthelida in the large continuous ecosystem connecting Lake Baikal to the Kara Sea

Bessudova

Firsova

Likhoshway

2021

J Eukaryotic Microbiology

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Heterotrophic protists Rotosphaerida, Thaumatomonadida, and centrohelid heliozoans are among the less studied silicified protists in terms of their biogeography and ecology. These organisms inhabit fresh and brackish water, and leave behind siliceous structural elements after death that are species‐specific and amenable to electron microscopic analysis. This paper is the first to present data on species richness and taxonomic structure of silica‐scaled heterotrophic protists—rotosphaerids, colorless free‐living thaumatomonad flagellates and centrohelid heliozoans—in the large continuous water system of Siberia connecting Lake Baikal to the Kara Sea. In the study area, electron microscopy revealed 21 centrohelid heliozoan species from the genera Raphidiophrys (1), Acanthocystis (7), Choanocystis (3), Raineriophrys (2), Raphidocystis (6), and Pterocystis (2), seven rotosphaerid species from the genera Pinaciophora (3), Turriplaca (2), Rabdiophrys (1), and Pompholyxophrys (1), and one thaumatomonad flagellate species Thaumatomastix. Two species of rotosphaerids, Rabdiophrys cf. anulifera and Pinaciophora tridentata, and two species of centrohelid heliozoans, Acanthocystis cf. tubata, and A. cf. cornuta, were found in the waters of Russia for the first time. The most widespread species in fresh water from Lake Baikal to the Lower Yenissei River were Pinaciophora fluviatilis and Raineriophrys cf. fortesca. These species disappeared from the protist assemblages of the Yenissei gulf of the Kara Sea due to higher salinity, with only three species, Acanthocystis cf. mylnikovi (at 3.12‰ salinity) and A. pectinata and Raphidocystis sp. 2 (at 8‰ salinity), found in the area. The sensitivity of silica‐scaled heterotrophic protists to changes in habitat parameters suggests that these microeukaryotes could be new indicator organisms.

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“…The pH and temperature at different stations range within 6.69-7.93 (neutral to slightly alkaline) and 12-17 • C, respectively. Likewise, a high species richness of silica-scaled chrysophytes (79 species) has been previously recorded in the Baikal Region with similar primary hydrochemical parameters [13,103]. pH is one of the major factors driving the development and distribution of silica-scaled chrysophytes [3].…”

Section: Discussionmentioning

confidence: 71%

“…The reaction of silica-scaled chrysophytes to changes in the concentration of magnesium and iron ions was intriguing, as this reaction was previously undetected. We have formerly discussed the importance of transparency and colour to the development of silica-scaled chrysophytes and phytoplankton in general [103][104][105]. Increases in water turbidity as a result of warming and the removal of terrigenous material by meltwater play significant roles in inhibiting the development of chrysophytes.…”

Section: Discussionmentioning

confidence: 99%

Diversity Variation of Silica-Scaled Chrysophytes Related to Differences in Physicochemical Variables in Estuaries of Rivers in an Arctic Watershed

et al. 2021

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The present study examined the taxonomic diversity of silica-scaled chrysophytes in the estuaries of the Arctic watershed of Yakutia in the context of global climate change, as these aquatic organisms are highly sensitive to environmental changes. Previously, 41 species of silica-scaled chrysophytes were recorded in the waters of Yakutia. In the present study, we supplemented this list with 55 species. We observed a high species richness (82 taxa) of silica-scaled chrysophytes in the study area. Of these, eight species were recorded in the waters of Russia for the first time. At present, the study area represents the northernmost habitat for most species observed during the study. The diversity of silica-scaled chrysophytes in Arctic rivers is comparable to or even greater than the diversity of chrysophycean flora at the middle latitudes. Most of these chrysophytes are represented by polyzonal and ubiquitous species. During 2008–2010, we noted increased relative numbers of boreal species in northern waters compared with data obtained during the previous 30 years. Overall, the species richness of silica-scaled chrysophytes in the studied rivers increased with increase in water transparency, temperature, and magnesium ion concentration, but decreased with increase in surfactant concentration. The origin of samples from a certain river; distance of the sampling site from the estuary; water temperature, transparency, and colour; and concentration of carbon dioxide, magnesium ions, total iron, surfactants, and oil products affect the species composition of silica-scaled chrysophytes in the study area. Our findings are fundamental to evaluate the current status of Arctic aquatic microflora and its further monitoring in the context of anthropogenic and climatic impacts.

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Effects of water levels on species diversity of silica-scaled chrysophytes in large tributaries of Lake Baikal

Cited by 4 publications

References 43 publications

Small Organisms in a Large River: What Provides the High Diversity of Scaled Chrysophytes in the Ob River?

Small Organisms in a Large River: What Provides the High Diversity of Scaled Chrysophytes in the Ob River?

Silica‐scaled heterotrophic protists Rotosphaerida, Thaumatomonadida, and Centroplasthelida in the large continuous ecosystem connecting Lake Baikal to the Kara Sea

Diversity Variation of Silica-Scaled Chrysophytes Related to Differences in Physicochemical Variables in Estuaries of Rivers in an Arctic Watershed

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