Seasonal changes in phytoplankton and bioindices in the southern part of Lake Jeziorak (NE Poland)

2015 ◽  
Vol 44 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Ewa A. Dembowska ◽  
Szymon Józefowicz
Keyword(s):  
Cyanobacterial Blooms ◽  
Total Biomass ◽  
Dominant Group ◽  
Tourism Impact ◽  
Phytoplankton Assemblages ◽  
Entire Study ◽  
Ne Poland ◽  
Phytoplankton Communities ◽  
Limnothrix Redekei ◽  
First Time

AbstractThe structure of phytoplankton communities of Lake Jeziorak was presented for the first time. The objective of our research was qualitative and quantitative analysis and bioindices of phytoplankton during and outside the tourist season. Analysis of phytoplankton assemblages were performed in 2011-2012. A total of 96 taxa were identified in Lake Jeziorak, mainly: Cyanobacteria - 20, Bacillariophyceae - 49, and Chlorophyta − 19. Biomass of the phytoplankton varied from 10 mg l−1 in October to 29 mg l−1 in May. In the whole research period, Cyanobacteria dominated and represented up to 68% of the total biomass. The cyanobacterial blooms were constantly observed. Biomass in the summer period was composed of filamentous Aphanizomenon gracile, Limnothrix redekei, Planktothrix agardhii and Pseudanabaena limnetica. Outside the holiday season, i.e. in autumn and spring, filamentous Cyanobacteria accompanied cryptomonads in phytoplankton. The species composition, the biomass of phytoplankton, and TSI indicate the hypertrophic conditions of the lake. Phytoplankton in Lake Jeziorak was in a state of equilibrium for almost the entire study period. S1 was a dominant group and its abundance and biomass did not change by more than 10%. There was no significant direct effect of the seasonal tourism impact on the development of phytoplankton in Lake Jeziorak.

scholarly journals Phytoplankton and water quality of Lake Kuchane (Pskov region, Russia)

2021 ◽  
pp. 251-261
Author(s):  
T. V. Drozdenko ◽  
A. A. Volgusheva
Keyword(s):  
Class Iii ◽  
Entire Study ◽  
Trophic Index ◽  
Phytoplankton Communities ◽  
Pskov Region ◽  
Oligotrophic Water ◽  
First Time ◽  
Species Taxon ◽  
Alkaline Waters

The phytoplankton communities of Lake Kuchane, located in the Mikhailovskoye Museum-Reserve, were studied during different 2016–2017 seasons for the first time. 213 specific and intraspecific taxa from 9 phylums were identified in the phytoplankton, namely: Bacillariophyta, Chlorophyta, Chrysophyta, Euglenophyta, Cyanobacteria, Dinophyta, Cryptophyta, Charophyta, and Xanthophyta. The ratio of the main phylums of microalgae during the studied seasons was similar. The floristic complex of the lake's algoflora consisted of diatoms (36.6%), green (27.2%) and golden (10.8%) algae. Most of the phytoplankton genera contained one species taxon only. The specific composition of the phytoplankton community in 2017 was similar from spring to autumn. The minimum specific similarity of the phytoplankton communities was noted in July, 2016, and August, 2017. According to the level of biomass of planktonic algae, the lake belongs to oligotrophic water bodies. The planktonic algoflora of Lake Kuchane is characterized by the predominance of cosmopolitan freshwater forms of microalgae. In relation to pH, the predominant representatives preferred slightly alkaline waters. The Milius trophic index varied in the range 18.0–39.6 with a maximum value in summer. The Pantle–Bukk saprobity index almost did not change during the entire study. The waters of Lake Kuchane corresponded to the betamesosaprobic self-purification zone, quality class III. 

Differences between Nearshore and Offshore Phytoplankton Communities in Lake Ontario

1987 ◽  
Vol 44 (12) ◽  
pp. 2155-2163 ◽  
Author(s):  
I. M. Gray
Keyword(s):  
Chlorophyll A ◽  
Phytoplankton Biomass ◽  
Algal Biomass ◽  
Phytoplankton Community ◽  
Seasonal Pattern ◽  
Principal Component ◽  
Lake Ontario ◽  
Dominant Group ◽  
Phytoplankton Communities ◽  
Eutrophic Species

Differences between nearshore and offshore phytoplankton biomass and composition were evident in Lake Ontario in 1982. Phytoplankton biomass was characterized by multiple peaks which ranged over three orders of magnitude. Perhaps as a consequence of the three times higher current velocities at the northshore station, phytoplankton biomass ranged from 0.09 to 9.00 g∙m−3 compared with 0.10 to 2.40 g∙m−3 for the midlake station. Bacillariophyceae was the dominant group at the northshore station until September when Cyanophyta contributed most to the biomass (83%). Although Bacillariophyceae was the principal component of the spring phytoplankton community at the midlake station, phytoflagellates (49%) and Chlorophyceae (25%) were responsible for summer biomass, with the Chlorophyceae expanding to 80% in the fall. The seasonal pattern of epilimnetic chlorophyll a correlated with temperature. While chlorophyll a concentrations were similar to values from 1970 and 1972, algal biomass had declined and a number of eutrophic species (Melosira binderana, Stephanodiscus tenuis, S. hantzschii var. pusilla, and S. alpinus) previously found were absent in 1982.

scholarly journals PhytoSFDM version 1.0.0: Phytoplankton Size and Functional Diversity Model

2016 ◽  
Vol 9 (11) ◽  
pp. 4071-4085 ◽  
Author(s):  
Esteban Acevedo-Trejos ◽  
Gunnar Brandt ◽  
S. Lan Smith ◽  
Agostino Merico
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Marine Ecosystem ◽  
Three Dimensional ◽  
Functional Trait ◽  
Global Ocean ◽  
Total Biomass ◽  
Spatially Resolved ◽  
Phytoplankton Communities ◽  
Natural Complexity

Abstract. Biodiversity is one of the key mechanisms that facilitate the adaptive response of planktonic communities to a fluctuating environment. How to allow for such a flexible response in marine ecosystem models is, however, not entirely clear. One particular way is to resolve the natural complexity of phytoplankton communities by explicitly incorporating a large number of species or plankton functional types. Alternatively, models of aggregate community properties focus on macroecological quantities such as total biomass, mean trait, and trait variance (or functional trait diversity), thus reducing the observed natural complexity to a few mathematical expressions. We developed the PhytoSFDM modelling tool, which can resolve species discretely and can capture aggregate community properties. The tool also provides a set of methods for treating diversity under realistic oceanographic settings. This model is coded in Python and is distributed as open-source software. PhytoSFDM is implemented in a zero-dimensional physical scheme and can be applied to any location of the global ocean. We show that aggregate community models reduce computational complexity while preserving relevant macroecological features of phytoplankton communities. Compared to species-explicit models, aggregate models are more manageable in terms of number of equations and have faster computational times. Further developments of this tool should address the caveats associated with the assumptions of aggregate community models and about implementations into spatially resolved physical settings (one-dimensional and three-dimensional). With PhytoSFDM we embrace the idea of promoting open-source software and encourage scientists to build on this modelling tool to further improve our understanding of the role that biodiversity plays in shaping marine ecosystems.

REE-, Sr-, Ca-aluminum-phosphate-sulfate minerals of the alunite supergroup and their role as hosts for radionuclides

2019 ◽  
Vol 104 (12) ◽  
pp. 1806-1819 ◽  
Author(s):  
Nicholas D. Owen ◽  
Nigel J. Cook ◽  
Mark Rollog ◽  
Kathy J. Ehrig ◽  
Danielle S. Schmandt ◽  
...  
Keyword(s):  
South Australia ◽  
Decay Chain ◽  
Aluminum Phosphate ◽  
Geological Time ◽  
Dominant Group ◽  
Compositional Zoning ◽  
Ore Processing ◽  
End Members ◽  
First Time ◽  
Copper Ores

Abstract Aluminum-phosphate-sulfate (APS) minerals of the alunite supergroup are minor components of uranium-bearing copper ores from the Olympic Dam deposit, South Australia. They typically represent a family of paragenetically late replacement phases after pre-existing REE-bearing phosphates (fluorapatite, monazite, and xenotime). Characterization with respect to textures and composition allows two groups to be distinguished: Ca-Sr-dominant APS minerals that fall within the woodhouseite and svanbergite compositional fields; and a second REE- and phosphate-dominant group closer to florencite in composition. All phases nevertheless display extensive solid solution among end-members in the broader APS clan and show extensive compositional zoning at the grain-scale. Samples representative of the deposit (flotation concentrate and tailings), as well as those that have been chemically altered during the processing cycle (acid leached concentrate), were studied for comparison. NanoSIMS isotope mapping provides evidence that the APS minerals preferentially scavenge and incorporate daughter radionuclides of the 238U decay chain, notably 226Ra and 210Pb, both over geological time within the deposit and during ore processing. These data highlight the role played by minor phases as hosts for geologically mobile deleterious components in ores as well as during mineral processing. Moreover, Sr-Ca-dominant APS minerals exhibit preferential sorption of Pb from fluid sources, in the form of both common Pb and 210Pb, for the first time revealing potential pathways for 210Pb elimination and reduction from ore processing streams.

scholarly journals Seasonal Succession of Phytoplankton Functional Groups and Driving Factors of Cyanobacterial Blooms in a Subtropical Reservoir in South China

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1167 ◽  
Author(s):  
Lingai Yao ◽  
Xuemin Zhao ◽  
Guang-Jie Zhou ◽  
Rongchang Liang ◽  
Ting Gou ◽  
...  
Keyword(s):  
Functional Groups ◽  
South China ◽  
Algal Cell ◽  
Seasonal Succession ◽  
Geographic Location ◽  
Water Source ◽  
Cyanobacterial Blooms ◽  
Nitrogen And Phosphorus ◽  
Phytoplankton Communities ◽  
Phytoplankton Functional Groups

Freshwater phytoplankton communities can be classified into a variety of functional groups that are based on physiological, morphological, and ecological characteristics. This classification method was used to study the temporal and spatial changes in the phytoplankton communities of Gaozhou Reservoir, which is a large municipal water source in South China. Between January 2015 and December 2017, a total of 155 taxa of phytoplankton that belong to seven phyla were identified. The phytoplankton communities were classified into 28 functional groups, nine of which were considered to be representative functional groups (relative biomass > 10%). Phytoplankton species richness was greater in the summer and autumn than in the winter and spring; cyanobacterial blooms occurred in the spring. The seasonal succession of phytoplankton functional groups was characterized by the occurrence of functional groups P (Staurastrum sp. and Closterium acerosum) and Y (Cryptomonas ovata and Cryptomonas erosa) in the winter and spring, and functional groups NA (Cosmarium sp. and Staurodesmus sp.) and P (Staurastrum sp. and Closterium acerosum) in the summer and autumn. The temperature, nitrogen, and phosphorus levels were the main factors driving seasonal changes in the phytoplankton communities of Gaozhou Reservoir. The functional group M (Microcystis aeruginosa) dominated the community during the cyanobacterial blooms in spring 2016, with the maximum algal cell density of 3.12 × 108 cells L−1. Relatively low temperature (20.8 °C), high concentrations of phosphorus (0.080–0.110 mg L−1), suitable hydrological and hydrodynamic conditions (e.g., relatively long retention time), and relatively closed geographic location in the reservoir were the key factors that stimulated the cyanobacterial blooms during the early stages.

scholarly journals PhytoSFDM version 1.0.0: Phytoplankton Size and Functional Diversity Model

2016 ◽  
Author(s):  
Esteban Acevedo-Trejos ◽  
Gunnar Brandt ◽  
S. Lan Smith ◽  
Agostino Merico
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Marine Ecosystem ◽  
Functional Trait ◽  
Total Biomass ◽  
Spatially Resolved ◽  
Flexible Response ◽  
Phytoplankton Communities ◽  
Marine Ecosystem Models ◽  
Natural Complexity

Abstract. Biodiversity is one of the key mechanisms that facilitate the adaptive response of planktonic communities to a fluctuating environment. How to allow for such a flexible response in marine ecosystem models is, however, not entirely clear. One particular way is to resolve the natural complexity of phytoplankton communities by explicitly incorporating a large number of species or plankton functional types. Alternatively, models of aggregate community properties focus on macroecological quantities such as total biomass, mean trait, and trait variance (or functional trait diversity), thus reducing the observed natural complexity to a few mathematical expressions. We developed the modelling tool PhytoSFDM, which can resolve species discretely and can capture aggregate community properties. The tool also provides a set of methods for treating diversity under realistic oceanographic settings. This model is coded in Python and is distributed as an open-source software. PhytoSFDM is implemented in a 0D physical scheme and can be applied to any location of the world oceans. We show that aggregate-community models reduce computational complexity while preserving relevant macroecological features of phytoplankton communities. Compared to species-explicit models, aggregate models are more manageable in terms of number of equations and have faster computational times. Further developments of this tool should address the caveats associated with the assumptions of aggregate community models and on implementations into spatially resolved physical settings (1D and 3D). With PhytoSFDM we embrace the idea of promoting open source software and encourage scientists to build on this modelling tool to further improve our understanding of the role that biodiversity plays in shaping marine ecosystems.

scholarly journals Fungus moths (Lepidoptera, Tineidae) of the Białowieża Forest

2014 ◽  
Vol 83 (1) ◽  
pp. 5-21 ◽  
Author(s):  
Tomasz Jaworski ◽  
Jacek Hilszczański ◽  
Radosław Plewa ◽  
Andrzej Szczepkowski
Keyword(s):  
Current Distribution ◽  
New Records ◽  
Białowieża Forest ◽  
Ne Poland ◽  
First Time ◽  
Laboratory Breeding

AbstractNew records for twenty species of saproxylic tineid moths (Lepidoptera, Tineidae) from the Białowieża Forest (NE Poland) are presented. Most species were recorded on the basis of laboratory breeding of the adult moths from the sporocarps of wood-decaying fungi inhabited by the larvae. Some species were captured using barrier traps or were collected at light. One species, Dryadaula irinae (Savenkov, 1989), is recorded for the first time from Poland and three others, Nemaxera betulinella (Paykull, 1785), Nemapogon fungivorella (Benander, 1939) and Elatobia fuliginosella Lienig & Zeller, 1846, are recognized as new for the fauna of the Białowieża Forest. The current distribution in Poland of each species is briefly discussed, and some remarks on its biology are given

scholarly journals Monthly Variation in the Macromolecular Composition of Phytoplankton Communities at Jang Bogo Station, Terra Nova Bay, Ross Sea

2021 ◽  
Vol 12 ◽  
Author(s):  
Kwanwoo Kim ◽  
Jisoo Park ◽  
Naeun Jo ◽  
Sanghoon Park ◽  
Hyeju Yoo ◽  
...  
Keyword(s):  
Physiological State ◽  
Weight Ratio ◽  
Future Climate Change ◽  
Average Weight ◽  
Polar Night ◽  
Entire Study ◽  
Terra Nova Bay ◽  
Phytoplankton Communities ◽  
Terra Nova ◽  
Night Period

Organic carbon fixed by photosynthesis of phytoplankton during the polar growing period could be important for their survival and consumers during the long polar night. Differences in biochemical traits of phytoplankton between ice-free and polar night periods were investigated in biweekly water samples obtained at the Korean “Jang Bogo Station” located in Terra Nova Bay, Antarctica. The average concentration of total Chl-a from phytoplankton dominated by micro-sized species from the entire sampling period was 0.32 μg L–1 (SD = ± 0.88 μg L–1), with the highest concentration of 4.29 μg L–1 in February and the lowest concentration of 0.01 μg L–1 during the ice-covered polar night (April–October) in 2015. The highest protein concentration coincided with the peak Chl-a concentration in February and decreased rapidly relative to the carbohydrate and lipid concentrations in the early part of polar night. Among the different biochemical components, carbohydrates were the predominant constituent, accounting for 69% (SD = ± 14%) of the total particulate organic matter (POM) during the entire study period. The carbohydrate contributions to the total POM markedly increased from 39 ± 8% during the ice-free period to 73 ± 9% during the polar night period. In comparison, while we found a significant negative correlation (r2 = 0.92, p < 0.01) between protein contributions and carbohydrate contributions, lipid contributions did not show any particular trend with relatively small temporal variations during the entire observation period. The substantial decrease in the average weight ratio of proteins to carbohydrates from the ice-free period (mean ± SD = 1.0 ± 0.3) to the ice-covered period (mean ± SD = 0.1 ± 0.1) indicates a preferential loss of nitrogen-based proteins compared to carbohydrates during the polar night period. Overall, the average food material (FM) concentration and calorific contents of FM in this study were within the range reported previously from the Southern Ocean. The results from this study may serve as important background data for long-term monitoring of the regional and interannual variations in the physiological state and biochemical compositions of phytoplankton resulting from future climate change in Antarctica.

scholarly journals Fibrocapsa japonica (Raphidophyceae) occurrence and ecological features within the phytoplankton assemblage of a cyclonic eddy, offshore the Eastern Alboran Sea.

2014 ◽  
Vol 15 (2) ◽  
pp. 250 ◽  
Author(s):  
F. FANI ◽  
C. NUCCIO ◽  
L. LAZZARA ◽  
L. MASSI ◽  
C. BATTOCCHI ◽  
...  
Keyword(s):  
Cyst Formation ◽  
Western Mediterranean ◽  
Cyclonic Eddy ◽  
Alboran Sea ◽  
Phytoplankton Assemblages ◽  
Ecological Features ◽  
Coastal Species ◽  
Fibrocapsa Japonica ◽  
First Time ◽  
Alborán Sea

The Raphidophycean Fibrocapsa japonica Toriumi & Takano was detected for the first time offshore in the Eastern Alboran Sea (Western Mediterranean) in October 2006. Its distribution appeared very localised and atypical, as it was abundant only in the open waters of a cyclonic eddy. Microscope counts of the natural phytoplankton assemblages revealed that F. japonica was dominant in the microplankton, together with Dinophyceae, within and below the cyclonic nutrient-rich dome (25 - 30 m). Bacillariophyceae were the primary microplanktonic fraction in only a few samples. Moderately high abundances of F. japonica (maximum of 60 cells ml-1), with preliminary cysts and many cells aggregated in mucous nets, indicated a senescent phase. We also suggest a Mediterranean origin for this species. This was confirmed by molecular identification and by a water temperature of 15 °C, which could have favoured pre-cyst formation. Finally, we hypothesise that F. japonica, which is generally a coastal species, could have a coastal origin. Since F. japonica was confined to the cyclonic waters, which typically derive from coastal waters, it was collected at a depth of 40-60 m at the coastal sites and it is generally a coastal species, we hypothesise that it could have a coastal origin and it was entrapped by the cyclonic eddy, which could have carried offshore this harmful species.

scholarly journals Comparative analysis of freshwater phytoplankton communities in two lakes of Burabay National Park using morphological and molecular approaches

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dmitry V. Malashenkov ◽  
Veronika Dashkova ◽  
Kymbat Zhakupova ◽  
Ivan A. Vorobjev ◽  
Natasha S. Barteneva
Keyword(s):  
National Park ◽  
Phytoplankton Assemblages ◽  
Freshwater Phytoplankton ◽  
Molecular Approaches ◽  
Phytoplankton Communities ◽  
Total Phytoplankton ◽  
Next Generation Sequencing Ngs ◽  
Taxonomic Characterization ◽  
Generation Sequencing

AbstractWe analyzed phytoplankton assemblages’ variations in oligo-mesotrophic Shchuchie and Burabay lakes using traditional morphological and next-generation sequencing (NGS) approaches. The total phytoplankton biodiversity and abundance estimated by both microscopy and NGS were significantly higher in Lake Burabay than in Lake Shchuchie. NGS of 16S and 18S rRNA amplicons adequately identify phytoplankton taxa only on the genera level, while species composition obtained by microscopic examination was significantly larger. The limitations of NGS analysis could be related to insufficient coverage of freshwater lakes phytoplankton by existing databases, short algal sequences available from current instrumentation, and high homology of chloroplast genes in eukaryotic cells. However, utilization of NGS, together with microscopy allowed us to perform a complete taxonomic characterization of phytoplankton lake communities including picocyanobacteria, often overlooked by traditional microscopy. We demonstrate the high potential of an integrated morphological and molecular approach in understanding the processes of organization in aquatic ecosystem assemblages.

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