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196 results for “Lake Baikal”
A unified dataset of co-located sewage pollution, periphyton, and benthic macroinvertebrate community and food web structure from Lake Baikal (Siberia)
Sewage released from lakeside development can introduce nutrients and micropollutants that can restructure aquatic ecosystems. Lake Baikal, the world's most ancient, biodiverse, and voluminous lake, has been experiencing localized sewage pollution from lakeside settlements. Increasing filamentous algal abundance suggests benthic communities are responding to this localized pollution. We surveyed 40-km of Lake Baikal's southwestern shoreline 19-23 August 2015 for sewage indicators, including pharmaceuticals, personal care products, and microplastics with co-located periphyton, macroinvertebrate, stable isotope, and fatty acid sampling. Unique identifiers corresponding to sampling locations are retained throughout all data files to facilitate interoperability among the dataset's 150+ variables. The data are structured in a tidy format (a tabular arrangement familiar to limnologists) to encourage future reuse. For Lake Baikal studies, these data can support continued monitoring and research efforts. For global studies of lakes, these data can help characterize sewage prevalence and ecological consequences of anthropogenic disturbance across spatial scales.
Fig. 4 in Two new nematode species of the genus Paratrilobus Micoletzky, 1922 (Nematoda, Triplonchida) from the water area of Lake Baikal (Russia)
Fig. 4. Paratrilobus aquaticus sp. nov., light micrographs. A. Entire male. B. Entire female. C. Female pharyngeal region. D. Male anterior end. E. Female anterior end. F. Female vulva region. G. Male cloacal region. H. Male posterior body end. I. Female posterior body end. A, D, G–H: holotype (HM RAS 102/64 768-2); B–C, I: paratype (HM RAS 102/64 768-4); E–F: paratype (LIN-SB 765-3). Scale bars: A–B = 200 µm; C, H = 50 µm; D–E = 10 µm; F–G, I = 20 µm.
Fig. 3 in Two new nematode species of the genus Paratrilobus Micoletzky, 1922 (Nematoda, Triplonchida) from the water area of Lake Baikal (Russia)
Fig. 3. Paratrilobus aquaticus sp. nov. A. Male anterior end. B. Female vulva region. C. Female posterior body end. D. Male precloacal supplement. E. Male posterior body end. A, D–E: holotype (HM RAS 102/64 768-2); B–C: paratype (HM RAS 102/64 768-4). Scale bars: A = 30 µm; B = 70 µm; C = 60 µm; D = 20 µm; E = 50 µm.
FIGURE 3 in Tobrilus methanus sp. n. and Tripyla posolskii sp. n. (Nematoda, Triplonchida) from Lake Baikal, Russia
FIGURE 3. Tripyla posolskii sp. n. Holotype male and paratype female. A: male, entire body; B: male head; C: vulva region; D: female tail; E: male tail. Scale bars: A— 200 µm; C – E— 60 µm; B— 25 µm.
Рис. 2. РаспреΔеΛение чисΛенности и биомассы зоопΛанктона гиΔротермаΛьной зоны оз. Кенон в июΛе 2019 г. Fig. 2. Distribution of zooplankton abundance and biomass in the hydrothermal zone of Lake Kenon in July 2019 in Zooplankton Structure And Distribution In The Hydrothermal Zone Of Cooling Reservoirs (Trans-Baikal Territory)
Рис. 2. РаспреΔеΛение чисΛенности и биомассы зоопΛанктона гиΔротермаΛьной зоны оз. Кенон в июΛе 2019 г. Fig. 2. Distribution of zooplankton abundance and biomass in the hydrothermal zone of Lake Kenon in July 2019
Рис. 1. ЭкоΛого-географическая характеристика зоопΛанктона гиΔротермаΛьной зоны оз. Кенон в июΛе 2019 г.: А — зоогеография, Б — местообитание, В — способ переΔвижения, Г — способ питания Fig. 1. Ecological and geographic characteristics of zooplankton in the hydrothermal zone of Lake Kenon in July 2019: А — zoogeography, Б — habitat, В — type of locomotion, Г — type of feeding in Zooplankton Structure And Distribution In The Hydrothermal Zone Of Cooling Reservoirs (Trans-Baikal Territory)
Рис. 1. ЭкоΛого-географическая характеристика зоопΛанктона гиΔротермаΛьной зоны оз. Кенон в июΛе 2019 г.: А — зоогеография, Б — местообитание, В — способ переΔвижения, Г — способ питания Fig. 1. Ecological and geographic characteristics of zooplankton in the hydrothermal zone of Lake Kenon in July 2019: А — zoogeography, Б — habitat, В — type of locomotion, Г — type of feeding
Рис. 2. Сезонная Αинамика чисΛенности и биомассы зоопΛанктона оз. Арейское в 2019– 2020 гг. Fig. 2. Seasonal dynamics of the zooplankton abundance and biomass in the Areiskoye Lake in 2019–2020 in Zooplankton of the Areiskoye Lake (Ingoda River basin, Trans-Baikal Territory)
Рис. 2. Сезонная Αинамика чисΛенности и биомассы зоопΛанктона оз. Арейское в 2019– 2020 гг. Fig. 2. Seasonal dynamics of the zooplankton abundance and biomass in the Areiskoye Lake in 2019–2020
Рис. 1. Карта-схема распоΛожения станций отбора проб в оз. Арейское в 2019–2020 гг. Fig. 1. Schematic map of the sampling station locations in the Areiskoye Lake in 2019–2020: 1 — N 50°59.8657ʹ, E 111°14.1410ʹ; 2 — N 50°59.8836ʹ, E 111°15.4172ʹ; 3 — N 50°58.7316ʹ, E 111°15.0106ʹ; 4 — N 50°58.7474ʹ, E 111°14.1384ʹ; 5 — N 50°59.0378ʹ, E 111°13.9848ʹ; 6 — N 50°59.3193ʹ, E 111°14.0639ʹ in Zooplankton of the Areiskoye Lake (Ingoda River basin, Trans-Baikal Territory)
Рис. 1. Карта-схема распоΛожения станций отбора проб в оз. Арейское в 2019–2020 гг. Fig. 1. Schematic map of the sampling station locations in the Areiskoye Lake in 2019–2020: 1 — N 50°59.8657ʹ, E 111°14.1410ʹ; 2 — N 50°59.8836ʹ, E 111°15.4172ʹ; 3 — N 50°58.7316ʹ, E 111°15.0106ʹ; 4 — N 50°58.7474ʹ, E 111°14.1384ʹ; 5 — N 50°59.0378ʹ, E 111°13.9848ʹ; 6 — N 50°59.3193ʹ, E 111°14.0639ʹ
Fig. 3 in Two new nematode species of the genus Tobrilus Andrássy, 1959 (Nematoda, Triplonchida) from Lake Baikal, Russia
Fig. 3. Tobrilus juliae sp. nov. A. Male anterior end. B. Female vulva region. C. Male pharyngeal region. D. Female posterior body end. E. Male posterior body end. Scale bars: A = 15 µm; B = 50 µm; C = 100 µm; D = 40 µm; E = 30 µm.
Fig. 1 in Two new nematode species of the genus Tobrilus Andrássy, 1959 (Nematoda, Triplonchida) from Lake Baikal, Russia
Fig. 1. Tobrilus elginus sp. nov. A. Male anterior end. B. Male pharyngeal region. C. Female posterior body end. D. Male posterior body end. E. Female vulva region. Scale bars: A = 20 µm; B, E = 100 µm; C–D = 50 µm.
Fig. 2 in Two new nematode species of the genus Tobrilus Andrássy, 1959 (Nematoda, Triplonchida) from Lake Baikal, Russia
Fig. 2. Tobrilus elginus sp. nov., light micrographs. A. Entire male. B. Entire female. C. Male pharyngeal region. D. Male anterior end. E. Female anterior end. F. Female vulva region. G, I. Male posterior body end. H. Male supplement region. J. Female posterior body end. Scale bars: A–B = 500 µm; C, F = 100 µm; D–E, H = 10 µm; G = 20 µm; I–J = 50 µm.
The diversity of opsins in Lake Baikal amphipods (Amphipoda: Gammaridae)
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Response of Lake Baikal periphyton to nutrient enrichment at 10 sites across a land use gradient: Results from a nutrient diffusing substrata (NDS) experiment
This data set contains results of a study on the response of benthic algae to experimental nutrient enrichment in the nearshore of Lake Baikal, Russia. Nutrient diffusing substrata (NDS) were deployed at 10 sites across a land-use gradient (from town to forested) during August to September of 2015 . Four NDS treatments were used at each site: 'control', 'added phosphorus', 'added nitrogen' and 'added nitrogen and phosphorus'. NDS tiles were left in the lake for 32-33 days. After retrieval, benthic chlorophyll a levels from all sites were analyzed as an index of periphyton biomass (data in file periphyton_chl_a.csv). Taxonomic identification of algae was done at 4 of the 10 sites (2 developed, 2 undeveloped); cell counts are presented in file 'periphyton_abundance.csv'; biovolumes were determined for the most common taxa and are presented in file 'periphyton_biovolume.csv'.
Leeches Baicalobdella torquata feed on hemolymph but have a low effect on the cellular immune response of amphipod Eulimnogammarus verrucosus from Lake Baikal
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ULTRAMICROBACTERIA AND FILTERABLE BACTERIA IN THE PLANKTON OF LAKE BAIKAL
<p>In Lake Baikal, the number, diversity and structure of femtoplankton – bacteria passing through filters with a pore size of 0.2 μm were studied for the first time using a complex of methods. The bacterial abundance in the femtoplankton fraction was 7×10<sup>4</sup> cells/ml in the 0-50 m water layer as measured by epifluorescence microscopy, and their contribution to the total bacterial number reached an average of 4.4%. High throughput sequencing of 16S rRNA gene fragments revealed a significant genetic and taxonomic diversity of femtobacterioplankton in the pelagic and littoral zones of the lake. Dominant and minor phyla, orders, families, genera, and phylotypes of bacteria were identified in two fractions of the Lake Baikal bacterioplankton larger and smaller than 0.2 µm; the contribution of ultrasmall bacteria to the taxonomic composition of microbial communities in different parts of the lake was determined. Significant differences in the microbiomes of bacterioplankton and femtobacterioplankton fractions were revealed, and the peculiarities of ultramicrobacteria composition were described. The results showed an important role of ultrasmall bacteria in the Lake Baikal ecosystem. </p> <p><strong>This repository contains raw sequencing data from DNA metabarcoding and metadata with samples description for the current study.</strong></p>
Data from: Transcriptome-based phylogeny of endemic Lake Baikal amphipod species flock: fast speciation accompanied by frequent episodes of positive selection
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FIGURE 2 in To the origin of Lake Baikal endemic gammarid radiations, with description of two new Eulimnogammarus spp.
FIGURE 2 Eulimnogammarus etingovae sp. nov. Holotype, female. A: antenna I* (inset: accessory flagellum enlarged); B: antenna II; C: palpus of mandible; D: maxilla I*; E: maxilla II; F: maxilliped; G: propodus of gnatopod I; H: propodus of gnatopod II; I: basipodit of pereopod VII; J: uropod III; K: telson. * - composite images. Bars = 0.1 mm.
Excessive parallelism in protein evolution of Lake Baikal amphipod species flock
Repeated emergence of similar adaptations is often explained by parallel evolution of underlying genes. However, evidence of parallel evolution at amino acid level is limited. When the analyzed species are highly divergent, this can be due to epistasic interactions underlying the dynamic nature of the amino acid preferences: the same amino acid substitution may have different phenotypic effects on different genetic backgrounds. Distantly related species also often inhabit radically different environments, which makes the emergence of parallel adaptations less likely. Here, we hypothesize that parallel molecular adaptations are more prevalent between closely related species. We analyze the rate of parallel evolution in genome-size sets of orthologous genes in three groups of species with widely ranging levels of divergence: 47 species of the relatively recent lake Baikal amphipod radiation, a species flock of very closely related cichlids, and a set of significantly more divergent vertebrates. In genes of amphipods, the rate of parallel substitutions at nonsynonymous sites exceeded that at synonymous sites, suggesting rampant selection driving parallel adaptation. By contrast, in cichlids, the rate of nonsynonymous parallel evolution nearly equalled that at synonymous sites, while in vertebrates, this rate was lower than that at synonymous sites, indicating the role of drift in fixation of parallel substitutions. Further data is needed to clarify the cause of the excessive parallelism observed in gammarids.
FIGURE 2 in Tobrilus methanus sp. n. and Tripyla posolskii sp. n. (Nematoda, Triplonchida) from Lake Baikal, Russia
FIGURE 2. Tobrilus methanus sp. n. Paratype male and female. A: male, entire body; B: female, entire body; C: male, anterior body end; D: female head; E: male head; F: vulva region; G: cloaca region; H: male tail; I: female tail. Scale bars: A, B—100 µm; C, H—50 µm; F, I—20 µm; D, E, G—10 µm.
FIGURE 1 in Tobrilus methanus sp. n. and Tripyla posolskii sp. n. (Nematoda, Triplonchida) from Lake Baikal, Russia
FIGURE 1. Tobrilus methanus sp. n. Holotype male and paratype female. A: male, entire body; B: male head; C: vulva region; D: male tail; E: female tail. Scale bars: A—100 µm; C–E—40 µm; B—15 µm.
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