The role of endemic diatom algae in the phytoplankton of Lake Baikal

Popovskaya, G. I.; Likhoshway, Ye. V.; Генкал, С. И.; Firsova, Alena D.

doi:10.1007/s10750-006-0328-4

Cited by 22 publications

(13 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are a predominant component of lake sediments and are known to be suitable bioindicator proxies used in spatial and temporal lake environmental reconstructions [5][6][7]. Moreover, studies on large old lake systems have uncovered several endemic diatom taxa [8][9][10][11], which make them suitable organisms to investigate their community patterns in the light of taxa differentiation and formation of biodiversity. It is known that differences in diatom communities in various intra-lake settings have been attributed to strong variations in lake depth, light exposure, ice cover dynamics, habitat variability and lake chemistry including pH, salinity, phosphorous and nitrogen concentrations, as well as to catchment-related differences [11][12][13][14][15][16], which suggests that these parameters especially influence the biodiversity of such systems.…”

Section: Introductionmentioning

confidence: 99%

Lake-depth related pattern of genetic and morphological diatom diversity in boreal Lake Bolshoe Toko, Eastern Siberia

et al. 2020

View full text Add to dashboard Cite

Large, old and heterogenous lake systems are valuable sources of biodiversity. The analysis of current spatial variability within such lakes increases our understanding of the origin and establishment of biodiversity. The environmental sensitivity and the high taxonomic richness of diatoms make them ideal organisms to investigate intra-lake variability. We investigated modern intra-lake diatom diversity in the large and old sub-arctic Lake Bolshoe Toko in Siberia. Our study uses diatom-specific metabarcoding, applying a short rbcL marker combined with next-generation sequencing and morphological identification to analyse the diatom diversity in modern sediment samples of 17 intra-lake sites. We analysed abundance-based compositional taxonomic diversity and generic phylogenetic diversity to investigate the relationship of diatom diversity changes with water depth. The two approaches show differences in taxonomic identification and alpha diversity, revealing a generally higher diversity with the genetic approach. With respect to beta diversity and ordination analyses, both approaches result in similar patterns. Water depth or related lake environmental conditions are significant factors influencing intra-lake diatom patterns, showing many significant negative correlations between alpha and beta diversity and water depth. Further, one near-shore and two lagoon lake sites characterized by low (0-10m) and medium (10-30m) water depth are unusual with unique taxonomic compositions. At deeper (>30m) water sites we identified strongest phylogenetic clustering in Aulacoseira, but generally much less in Staurosira, which supports that water depth is a strong environmental filter on the Aulacoseira communities. Our study demonstrates the utility of combining analyses of genetic and morphological as well as phylogenetic diversity to decipher compositional and generic phylogenetic patterns, which are relevant in understanding intra-lake heterogeneity as a source of biodiversity in the sub-arctic glacial Lake Bolshoe Toko.

show abstract

Section: Introductionmentioning

confidence: 99%

Lake-depth related pattern of genetic and morphological diatom diversity in boreal Lake Bolshoe Toko, Eastern Siberia

et al. 2020

View full text Add to dashboard Cite

show abstract

“…D. lemmermannii had already been found in Lake Baikal and the Irkutsk Reservoir earlier [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. It was identified as a dominating cyanobacteria in the plankton of Lake Baikal, sometimes producing large floating masses a few kilometers long [ 8 , 9 ]. In some years, D. lemmermannii has been found at very high concentrations—up to 10 × 10 6 cells L −1 [ 9 ].…”

Section: Discussionmentioning

confidence: 99%

“…It was identified as a dominating cyanobacteria in the plankton of Lake Baikal, sometimes producing large floating masses a few kilometers long [ 8 , 9 ]. In some years, D. lemmermannii has been found at very high concentrations—up to 10 × 10 6 cells L −1 [ 9 ]. It was recently demonstrated that D. lemmermannii samples collected in and around Lake Baikal contain the sxtA gene involved in the synthesis of saxitoxins.…”

Section: Discussionmentioning

confidence: 99%

“…[ 2 , 3 , 4 ], was long ago detected in the plankton of the shallow waters of Lake Baikal [ 5 , 6 , 7 , 8 ]. In some years D. lemmermannii has been found at very high concentrations—up to 10 × 10 6 cells L −1 [ 8 , 9 ]. During intensive blooms, D. lemmermannii can penetrate the surface waters of open Lake Baikal, forming ribbons a few kilometers long.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Extensive Contamination of Water with Saxitoxin Near the Dam of the Irkutsk Hydropower Station Reservoir (East Siberia, Russia)

Грачев

Zubkov

Тихонова

et al. 2018

Toxins

View full text Add to dashboard Cite

An area of discolored water 50 m wide and 30 m long was found in September 2017 close to the dam of the Irkutsk hydroelectric power station. Water from this spot was sampled for investigation in the present study. Microscopic analysis revealed that the suspended matter in the sample was composed of clumps of filaments, vegetative cells, akinetes and heterocysts that formed short filaments and solitary cells. This matter was found to consist of partially degraded cells of the cyanobacterium Dolichospermum lemmermannii. Nucleotide sequencing of DNA isolated from the biomass revealed the presence of the sxtA gene which is involved in the synthesis of saxitoxin. Water from the polluted area contained 600 ± 100 μg L−1 saxitoxin as measured by HPLC-MS with pre-column modification of the toxin with 2,4-dinitrophenylhydrazine. Immunoassay analysis (ELISA) showed a concentration of saxitoxins in the water of 2900 ± 900 μg L−1. Hydrochemical and microbiological analyses suggested the contaminated area appeared as a result of a D. lemmermannii bloom, followed by its decay and release of saxitoxin and nutrients. The present paper describes the results of a case study. Better understanding of the phenomenon will depend on the possibility to perform implementation of a large-scale monitoring program.

show abstract

“…The genus Aulacoseira is present in many modern freshwater bodies all over the planet, including Lake Baikal, where it is often dominant in certain seasons ( Popovskaya et al, 2011 ). Studying the morphogenesis of this genus is of considerable interest from an evolutionary point of view, as siliceous diatom valves can be preserved mostly intact in sediments for millions of years.…”

Section: Introductionmentioning

confidence: 99%

Anomalies in the valve morphogenesis of the centric diatom alga Aulacoseira islandica caused by microtubule inhibitors

et al. 2018

View full text Add to dashboard Cite

Of all unicellular organisms possessing a cell wall, diatoms are the most adept at micro- and nanoscale embellishment of their frustules. Elements of their cell walls are formed inside the cell under cytoskeletal control. In this work, we used laser scanning microscopy and electron microscopy to describe the major stages of cell wall formation in the centric diatom algae Aulacoseira islandica and to study the effect of various microtubule inhibitors on the morphogenesis of frustule elements. Our results show that colchicine inhibits karyokinesis and cytokinesis in A. islandica colonies. In contrast, valve morphogenesis is changed, rather than inhibited altogether. In normal cells, this process starts simultaneously in both daughter cells, beginning with the formation of two adjacent discs that later become valve faces and connecting spines. Under colchicine treatment, however, the cleavage furrow is blocked and a single lateral valve forms on the side of the cylindrical frustule. As a result, a single hollow pipe forms instead of two separate drinking glass-shaped frustules; such pipes can form up to 35% of all forming frustules. Colchicine inhibits the formation of connecting spines, whereas paclitaxel causes spines to form a complex, branching shape. At the same time, inhibitors do not affect the formation of areolae (openings) in the frustule. We discuss the possibility that various processes of the diatom frustule morphogenesis are controlled by two different mechanisms: membrane-related micromorphogenesis and cytoskeleton-mediated macromorphogenesis.

show abstract

The role of endemic diatom algae in the phytoplankton of Lake Baikal

Cited by 22 publications

References 4 publications

Lake-depth related pattern of genetic and morphological diatom diversity in boreal Lake Bolshoe Toko, Eastern Siberia

Lake-depth related pattern of genetic and morphological diatom diversity in boreal Lake Bolshoe Toko, Eastern Siberia

Extensive Contamination of Water with Saxitoxin Near the Dam of the Irkutsk Hydropower Station Reservoir (East Siberia, Russia)

Anomalies in the valve morphogenesis of the centric diatom alga Aulacoseira islandica caused by microtubule inhibitors

Contact Info

Product

Resources

About