scholarly journals Changes in species composition and physiological activity of fungi associations in two lakes, differing in trophicity

2014 ◽  
Vol 30 (2) ◽  
pp. 233-253
Author(s):  
Teresa Korniłłowicz
Keyword(s):  
Species Composition ◽  
Bottom Sediments ◽  
Physiological Activity ◽  
Eutrophic Lake ◽  
Cladosporium Herbarum ◽  
Mesotrophic Lake

The results of the present study indicated differences in species composition and physiological activity of saprophytic mycoflora between two lakes: mesotrophic lakę with accelerated eutrophication and an eutrophic one. In waters of the lake with lower trophicity the most frequently occurring species were <i>Hyalodendron</i> sp. and <i>Verticilliun lecani. These fungi prevailed in the total mycoflora and mycoflora decomposing proteins. The waters of the lake with higher trophicity are dominated by the population of V. lecani<,i>, which was proteolitically and pectinolytically active. In bottom sediments the following ubiquistic species were most common: <i>Cladosporium herbarum</i> (mesotrophic lake) and <i>Cephalosporium roseum</i> ( eutrophic lake).

Comparison of gastrotrich fauna on elodeids and in bottom sediments of lakes of different trophic status (the region Polesie Lubelskie, Eastern Poland)

2011 ◽  
Vol 40 (2) ◽  
Author(s):  
Teresa Nesteruk
Keyword(s):  
Species Diversity ◽  
Bottom Sediment ◽  
Bottom Sediments ◽  
Trophic Status ◽  
Vegetation Type ◽  
Eutrophic Lake ◽  
Diversity Indices ◽  
Eutrophic Lakes ◽  
Epiphytic Fauna ◽  
Mesotrophic Lake

AbstractSpecies diversity of gastrotrich communities on elodeids and in bottom sediments of lakes of different trophic status was compared. Thirty-eight species of Gastrotricha (34 in bottom sediment and 21 on elodeids) were found, which belong to the only family of Chaetonotidae Zelinka, 1889. Species diversity of both habitats was reflected in the diversity indices ranging from 2.02 (a dystrophic lake) to 2.67 (a strongly eutrophic lake) for bottom sediment, and from 2.01 (a mesotrophic lake) to 2.54 (a strongly eutrophic lake) for elodeids. The similarity of gastrotrich fauna from the two habitats was low, and varied from 17% (a mesotrophic lake) to 38% (a strongly eutrophic lake). Low similarity of elodeid fauna from lakes of different trophic status was also found, in spite of similar plant species composition. The lowest similarity in elodeid fauna (23%) was recorded for dystrophic and mesotrophic lakes, whereas the highest one (68%) was observed for eutrophic and strongly eutrophic lakes. That allows to conclude that the diversity of epiphytic fauna is affected by trophic status rather than by vegetation type. The comparison of the gastrotrich fauna from elodeids and bottom sediments in lakes of different trophic status provides additional autoecological characteristics of Heterolepidoderma ocellatum (Mečnikow, 1865) and allows to recognize this species as belonging to a group of species closely related to macrophytes.

Phosphorus release from the bottom sediments of Lake Rusałka (Poznań, Poland)

2010 ◽  
Vol 39 (4) ◽  
Author(s):  
Katarzyna Kowalczewska-Madura ◽  
Ryszard Gołdyn ◽  
Renata Dondajewska
Keyword(s):  
Experimental Research ◽  
Bottom Sediments ◽  
Significant Influence ◽  
Eutrophic Lake ◽  
Phosphorus Release ◽  
Internal Loading ◽  
Release Process

Phosphorus release from the bottom sediments of Lake Rusałka (Poznań, Poland)Experimental research conducted on bottom sediments from the eutrophic Lake Rusałka (Poznań, Poland) indicated that the phosphorus release process has a significant influence on the functioning of the ecosystem. Internal loading was very intense in the deepest part of the lake, where it reached up to 29.84 mg m

scholarly journals Phosphorus dynamics in sediments of a eutrophic lake derived from 31P nuclear magnetic resonance spectroscopy

2014 ◽  
Vol 65 (1) ◽  
pp. 70 ◽  
Author(s):  
Deniz Özkundakci ◽  
David P. Hamilton ◽  
Richard McDowell ◽  
Stefan Hill
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Water Column ◽  
Bottom Sediments ◽  
Eutrophic Lake ◽  
Resonance Spectroscopy ◽  
31P Nmr Spectroscopy ◽  
31P Nuclear Magnetic Resonance ◽  
Lake Okaro ◽  
Nuclear Magnetic

The determination of organic phosphorus (P) compounds in lake sediments can provide information on the potential for internal P loading. Settling seston and vertical sediment core samples from highly eutrophic Lake Okaro, New Zealand, were collected during a mixed winter and stratified summer period, representing, respectively, when the water column was well oxygenated and when the bottom waters were anoxic. Samples were analysed with 31P nuclear magnetic resonance (31P NMR) spectroscopy, which showed that both bottom sediments and settling seston contained orthophosphate, orthophosphate monoesters and diesters, pyrophosphates, polyphosphates and phosphonates. Phosphorus concentration in settling seston increased ~2.5-fold in winter as a result of seasonally induced changes in phytoplankton biomass, with a marked increase in the concentration of orthophosphate. Several potentially bioavailable P compounds in the bottom sediments were identified that were likely to contribute to recycling of P from the sediment to the water column. An ‘apparent half-life’ was used to quantify the time scales on which these compounds were recycled to the overlying water column. Orthophosphate monoesters that include inositol phosphates were the most persistent P compound. On the basis of half-lives, high internal P loadings may persist for more than 20 years, potentially hindering restoration efforts in Lake Okaro.

scholarly journals Current State of Heterotrophic Bacterioplankton and Bacteriobenthos in the Northern and Middle Parts of the Caspian Sea

2020 ◽  
Author(s):  
Svetlana Dyakova ◽  
Victoria Volodina ◽  
Ekaterina Galyautdinova ◽  
Anna Menkova ◽  
Olga Soprunova
Keyword(s):  
Species Composition ◽  
Crude Oil ◽  
Bottom Sediments ◽  
Caspian Sea ◽  
Heterotrophic Bacteria ◽  
Middle Part ◽  
The Caspian Sea ◽  
Heterotrophic Bacterioplankton ◽  
Fermenting Bacteria ◽  
Two Peaks

Data on the abundance of heterotrophic bacterioplankton and bacteriobenthos in the northern and middle parts of the Caspian during the period from 2013 to 2017 are presented. In the waters of the northern part of the Caspian, a peak in the number of saprotrophs and crude oil degraders was recorded in 2013. In the middle part of the Caspian and in the region of the Mangyshlak regression, high numbers of heterotrophic bacteria were recorded in 2013 and 2016. The biodiversity of bacterioplankton in the surveyed areas is almost the same; the species composition of saprotrophs and crude oil degraders is identical. In the bottom sediments of the northern and middle parts of the Caspian Sea, two peaks of saprotrophic bacteriobenthos development (in 2013 and 2016) were recorded; in the region of the Mangyshlak threshold, the concentration of saprotrophs remained stable. The number of crude oil degraders was inferior to those of saprotrophs, while the proportion of crude oil degraders to saprotrophs changed annually. The species composition of saprotrophs is relatively stable, the biodiversity of oil-oxidizing bacteriobenthos has changed in the direction of increasing the proportion of non-fermenting bacteria. Constant changes in the ratio of the number of saprotrophs and crude oil degraders, together with the transformations of the dominant groups of the species composition of bacteria, indicated the instability of bacteriobenthos, and, as a result, the vulnerability of the microecosystem of bottom sediments under changing environmental conditions.

scholarly journals Distribution of Polychaeta Communities in the Western and Northern Part of the Barents Sea

2020 ◽  
Author(s):  
Dinara Dikaeva ◽  
Elena Frolova
Keyword(s):  
Species Composition ◽  
Bottom Sediments ◽  
Barents Sea ◽  
Bottom Topography ◽  
Silty Clay ◽  
The Barents Sea ◽  
Structure Of Communities ◽  
Composition And Structure ◽  
Quantitative Characteristics ◽  
Hard Soils

Species composition and quantitative characteristics of polychaetes in the western and northern parts of the Barents Sea were analyzed on the basis of the material collected in July and November 2017 on MMBI expeditions aboard the RV “Dalniye Zelentsy”. Three faunistic polychaete complexes were revealed, depending on environmental conditions in the study area. A change in species composition and structure of communities from the bottom topography, structure of bottom sediments and bottom hydrodynamics were noted. An increase in biomass and density of polychaetes settlement was revealed in deep-water areas of the Barents Sea, on soft silty-clay soils, where the dominant species is Spiochaetopterus typicus. A decrease in quantitative characteristics of polychaetes was observed in shallow areas, on hard soils, in the zone of intensive erosion of bottom sediments as a result of warm and cold currents interaction, where the polychaete Nothria hyperborea dominated.

scholarly journals Dynamics of small-sized Cladocera and their algal diet in lake with toxic cyanobacterial water blooms

2018 ◽  
Vol 54 ◽  
pp. 6 ◽  
Author(s):  
Michał Solis ◽  
Barbara Pawlik-Skowrońska ◽  
Małgorzata Adamczuk ◽  
Renata Kalinowska
Keyword(s):  
Species Composition ◽  
Eutrophic Lake ◽  
Cyanobacterial Blooms ◽  
Quantitative Structure ◽  
Before And After ◽  
Diaphanosoma Brachyurum ◽  
Qualitative Structure ◽  
Daphnia Cucullata ◽  
Algal Diet ◽  
Water Blooms

Species composition and quantitative structure of small-sized Cladocera community and their algal diet before, during and after cyanobacterial blooms were studied in highly eutrophic lake. The objective of the study was to investigate, how the mass development of toxin-producing cyanobacteria affect the abundances of small-sized Cladocera and their preferences within consumed algal cells. Cyanobacterial blooms were predominantly constituted by microcystin-producing genera Planktothrix, Dolichospermum, Microcystis. The concentration of intracellular microcystins in lake water ranged 0.0–23.61 μg dm−3. Bosmina longirostris, B. coregonii, Diaphanosoma brachyurum and Daphnia cucullata were dominant in Cladocera community. The highest abundances of B. longirostris occurred in periods without cyanobacterial blooms and B. coregonii during blooms and after them. The maximum abundances of D. cucullata were observed before and after the cyanobacterial blooms, while the abundance of D. brachyurum was the highest at the beginning of blooms. Small Bacillariophyceae, small Chlorophyceae and Cryptophyceae were the most abundant among identified algal cells detected in digestive tracts of the Cladocera dominants. Tracts of D. cucullata, B. longirostris and B. coregonii contained the highest number of Bacillariophyceae always before blooms. During cyanobacterial blooms, cells of small Chlorophyceae predominated in tracts of D. cucullata. After bloom, cells of Cryptomonas spp. were mainly consumed both by D. cucullata and by B. coregonii. Fragments of Dolichospermum spp., besides Bacillariophyceae and Cryptomonas spp. cells, were occasionally found in tracts of D. brachyurum. Our study indicated that blooms constituted by toxin-producing cyanobacteria may influence quantitative and qualitative structure of the small-sized Cladocera community.

A Comparative Review of Phytoplankton and Primary Production in the Laurentian Great Lakes

1974 ◽  
Vol 31 (5) ◽  
pp. 739-762 ◽  
Author(s):  
R. A. Vollenweider ◽  
M. Munawar ◽  
P. Stadelmann
Keyword(s):  
Species Composition ◽  
Primary Production ◽  
Great Lakes ◽  
Physiological Activity ◽  
Biomass Concentration ◽  
Laurentian Great Lakes ◽  
Comparative Review

Species composition of phytoplankton in the Laurentian Great Lakes, its biomass concentration, and its physiological activity measured as photosynthesis related to eutrophication, are reviewed and discussed.

scholarly journals The dynamics the quantitative changes of mycoflora in two lakes differing in trophicity (Poland). I.

2014 ◽  
Vol 29 (1) ◽  
pp. 23-31 ◽  
Author(s):  
Teresa Korniłłowicz
Keyword(s):  
Littoral Zone ◽  
Eutrophic Lake ◽  
Saprophytic Fungi ◽  
Mesotrophic Lake ◽  
Annual Changes ◽  
Quantitative Changes

It was demonstrated that the number of saprophytic fungi in the population of plankton in mesotrophic lake changing to eutrophic (Lake Piaseczno) was mountained a similiar level (average values) as in the eutrophic one (Lake Głębokie). The seasonal and annual changes in the number of fungi in the waters of the lake with lower trophicity were markedly stronger than those in the lake with higher trophicity. In the mesotrophic lake this was connected with the intensity of phytoplankton development. The greatest accumulation of fungi occured in the waters of littoral zone in both lakes and in the pelagial metha- and hypolimniun of the Lake Piaseczno.

scholarly journals The changes in the number and physiological properties of fungi in lakes differing in trophicity

2014 ◽  
Vol 29 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Teresa Korniłłowicz
Keyword(s):  
Littoral Zone ◽  
Eutrophic Lake ◽  
Frequency Of Occurrence ◽  
Mesotrophic Lake ◽  
Physiological Properties ◽  
Lake Waters

U was demonstrated that the fungi decomposing protein were most abundant in tbe mesotrophic lake, whereas the fungi decomposing pectin dominated in the eutrophic lake. The accumulation of fungi mineralizing protein in littoral zone (metha- and hypolimnion of pelagial zone) of the mesotropbic lake indicated the increase in the fertility of this reservoir. The frequency of occurrence of physiologically differentiated mycoflora in the lake waters was seasonal and revealed fluctuations in their activity depending on the year of the study. These fluctuations were stronger in the mesotrophic lake.

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