scholarly journals Changes in macroelement content of rhizomes of Nuphar lutea (L.) Sibith. and Sm. during the annual cycle

2011 ◽  
Vol 78 (3) ◽  
pp. 257-262
Author(s):  
Henryk Tomaszewicz
Keyword(s):  
Water Layer ◽  
Growing Season ◽  
Apical Part ◽  
Fresh Matter ◽  
Dissolved Silica ◽  
Nuphar Lutea ◽  
Bottom Water Layer ◽  
Sodium Calcium ◽  
Additional Table ◽  
Matter Basis

This study presents the results of studies on the chemical composition of rhizomes of <em>Nuphar lutea</em> which were carried out from July 2006 to November 2007 (the samples were collected at two-week intervals from March to November 2007). The first indication of the start of the growing season was the growth of leaves in the apical part of the rhizomes. Clearly visible signs that marked the beginning of the growing season were unfolding of leaves, which became arrow-shaped. The leaves had already unfolded and were arrow-shaped (saggitate) on April 10th when the temperature of the bottom water layer was 7<sup>o</sup>C. It may be assumed, therefore, that the growing season began between the 28th March and 10th April 2007. The phosphates, nitrates, sodium, calcium, total iron and sulphates levels in the rhizomes declined just after the growing season had started. The total nitrogen content remained at a constant level whereas the amount of dissolved silica increased. Considerable changes in the macroelement contents were noted when <em>Nuphar lutea</em> was in full bloom (10th-24th June). The macroelement contents presented in the tables and diagrams were expressed on a dry matter basis. An additional table illustrates the macroelement contents expressed on a fresh matter basis. The problem of collecting rhizomes of polycormic plants is discussed.

scholarly journals Changes in macroelement content in Nuphar lutea (L.) Sibith. and Sm. during the growing season

2011 ◽  
Vol 78 (2) ◽  
pp. 151-165 ◽  
Author(s):  
Henryk Tomaszewicz ◽  
Hanna Ciecierska
Keyword(s):  
Chemical Composition ◽  
Growing Season ◽  
Eutrophic Lake ◽  
Total Iron ◽  
Nuphar Lutea ◽  
Sodium Calcium ◽  
Water And Sediment ◽  
Chemical Composition Of Water ◽  
Phosphate Nitrate ◽  
Iron Sulphate

This study presents the results of monitoring studies carried out to determine the chemical composition of <em>Nuphar lutea</em> in two phytocoenoses of <em>Nupharo-Nymphaeetum albae</em> Tomasz. 1977 occurring in two lakes of different trophic types (eutrophic Lake Łaśmiady and oligo-humotrophic Lake Pływające Wyspy). The leaves (collected starting in May), rhizomes and roots of <em>Nuphar lutea</em> as well as water and sediment samples were collected from March to November in the above phytocoenoses (for 3 years in Lake Pływające Wyspy and for 4 years in Lake Łaśmiady). The samples were analysed for several parameters including: phosphate, nitrate, total nitrogen, potassium, sodium, calcium, total iron, sulphate and silica dissolved. In addition the manganese, cadmium, zinc and lead contents were determined in the leaves, rhizomes and roots of the plants collected in July (at the height of the growing season). It was found that the differences in the chemical composition of water and sediments between the lakes studied were more pronounced than in the case of leaves, rhizomes and roots of <em>Nuphar lutea</em>.

scholarly journals On the possible presence of oxygen in the upper sediment layer of the hydrogen sulfide zone in the Black Sea

2019 ◽  
Vol 59 (1) ◽  
pp. 166-169
Author(s):  
P. A. Stunzhas ◽  
M. B. Gulin ◽  
A. G. Zatsepin ◽  
E. A. Ivanova
Keyword(s):  
Black Sea ◽  
Benthic Fauna ◽  
Water Layer ◽  
Bottom Layer ◽  
The Black Sea ◽  
Depth Range ◽  
Sediment Layer ◽  
Bottom Water Layer ◽  
Long Time ◽  
Eukaryotic Organisms

In the northeastern Black Sea the search was performed for living eukaryotic organisms (micro- and meiobenthos) in hypoxic and anoxic conditions as well as measurement of O2 in the bottom water layer and in the upper layer of sediments. The results have shown the presence of a deep maximum abundance of zoobenthos in a depth range of 215–244 m. This aggregation of benthic fauna occupies a layer of 30 m along the vertical. In general, the proportion of active meiobenthos was no greater than 1.5% of the total number of organisms recorded from the sample.The presence of aerobic benthos near the upper boundary of the H2S zone can be explained by: sliding down of sediments from a higher depth; quasi-periodic O2 supply due to fluctuations in the position of the isopycna and/or sinking of waters downslope in the bottom Ekman layer. Also, in the case of physical entry of oxygen into the bottom layer, it can remain for a relatively long time in the upper part of the H2S zone due to the lack of deep Mn+2 flux and reaction with it.

Compositional, Physical, Antioxidant and Sensory Characteristics of Novel Syrup from Date Palm (Phoenix dactylifera L.)

2009 ◽  
Vol 15 (6) ◽  
pp. 583-590 ◽  
Author(s):  
I. Ben Thabet ◽  
S. Besbes ◽  
M. Masmoudi ◽  
H. Attia ◽  
C. Deroanne ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Nutritional Value ◽  
Date Palm ◽  
Phoenix Dactylifera ◽  
Total Phenolic ◽  
Fresh Matter ◽  
Maple Syrup ◽  
Phoenix Dactylifera L ◽  
Date Palm Sap ◽  
Matter Basis

This study is a contribution to valorise date palm sap (Phoenix dactylifera L.) by elaboration of high quality syrup. Sap was concentrated by evaporation and the obtained product was characterized by its physicochemical, rheological, thermal, sensory properties and by its antioxidant activity. Syrups from date palm sap have a good nutritional value marked by high amounts of sugars (58—75 g/100 g fresh matter basis), minerals (2.1—2.6 g/100 g fresh matter basis) and phenolics (147.61—224.55 mg of ferulic acid equivalents/kg fresh weight). Syrup also presents an antioxidant activity that appears related to total phenolic content. Rheological properties indicate that syrup preserves a Newtonian behavior from 10 °C to 55 °C well modeled by Arrhenius equation. Hedonic evaluation showed that consumers’ appreciation of date palm syrup was not significantly different to the most known sap syrup: maple syrup.

Effect of bacteria from the bottom water layer of lake baikal on degradation of diatoms

2013 ◽  
Vol 47 (9) ◽  
pp. 1030-1034 ◽  
Author(s):  
Yu. R. Zakharova ◽  
M. I. Kurilkina ◽  
A. V. Likhoshvay ◽  
S. M. Shishlyannikov ◽  
O. V. Kalyuzhnaya ◽  
...  
Keyword(s):  
Lake Baikal ◽  
Bottom Water ◽  
Water Layer ◽  
Bottom Water Layer

scholarly journals Temporal variability of catches, distribution and dynamics of length of Russian sturgeon in waters of the Caspian Sea in 2015 –2020

2021 ◽  
Vol 0 (4) ◽  
pp. 80-90
Author(s):  
Irina Victorovna Konopleva
Keyword(s):  
Caspian Sea ◽  
Adult Population ◽  
Water Layer ◽  
Middle Part ◽  
Russian Sturgeon ◽  
The Caspian Sea ◽  
Bottom Water Layer ◽  
The North ◽  
Shallow Zone ◽  
Heating Up

The paper presents long-term data on catches, distribution and length dynamics of Russian sturgeon in the waters of the Caspian Sea for the summer-autumn periods in 2015-2020. When considering the catches in the different parts of the sea there is found their annual variability, which is especially noticeable in the shallow zone in the North Caspian (0.31-2.0 specimens/trawl) and in the Middle Caspian (0-1.31 specimens/trawl). In the course of determining the reasons for the interannual dynamics of catches there were revealed several decadal rises. The dependence of decadal catches on the temperature of the bottom water layer was analyzed. The highest rise in catches was observed in the first decade of September when the temperature of water lowered up to 20.0-15.0 °C. The increase was observed due to migrating individuals to the shallow zone of the Northern Caspian Sea from shallow waters. Despite the variability of catches, the localization of Russian sturgeon schooling in the northern and middle part of the sea during the summer-autumn periods of 2015-2020 has certain similar features and trends. Sturgeon species fed mainly on shallow banks and deep dumps, where the largest catches of sturgeon were recorded from 5.0 to 12.0 specimens/trawl. The absence of sturgeon at depths of up to 3.0 m isobath in the last five years is due to the water heating up to 27.6-28.8 °C. The decrease in the length of the Russian sturgeon observed in recent years is due to an increase in the proportion of youngsters (19.2-70.0%) against the background of a decrease in the adult population. It should be noted that from 2017 to 2019 there were not found the adult species in the catches by fishing nets, which indicates their continued re-moval from the population.

Spatial structure of the macroand meiobenthic communities in homogenous conditions (on the example of the Pechora Sea)

2019 ◽  
Vol 59 (3) ◽  
pp. 405-412
Author(s):  
V. V. Kozlovskiy ◽  
M. V. Chikina ◽  
N. V. Shabalin ◽  
A. B. Basin ◽  
V. O. Mokievskiy ◽  
...  
Keyword(s):  
Grain Size ◽  
Spatial Structure ◽  
Bottom Water ◽  
Barents Sea ◽  
Water Layer ◽  
Bottom Water Layer ◽  
South Eastern ◽  
Leading Role ◽  
Serripes Groenlandicus ◽  
Historic Data

Spatial structure of the macroand meiobenthic communities of the south-eastern Barents Sea (also known as Pechora Sea) was investigated in 2003 during the expedition of the RV «Professor Shtokman». One grid of the stations was used for both benthic size classes. Community dominated by Serripes groenlandicus occupied the most part of the investigated polygon, Astarte borealis dominated the easternmost station. Described communities are in correspondence with historic data. In the meiobenthic communities, nematodes played a leading role, accounting for 86–94% of the total number. Nematode Richtersia inaequalis was dominant on most stations, at the northernmost station the nematodes Cervonema papillatum and Microlaimus affinis dominated. The temperature and the salinity of the near-bottom water layer were homogenous, macroand meiobenthic communities were not influenced by grain size. In contrast to our expectations, communities of the macroand meiobenthos were distributed independently of each other on the mesoscale area (30×11 km).

Distribution of elements in the vertical cut of bottom sediments of the Black sea

2020 ◽  
pp. 60-68
Author(s):  
E. I. Nemchenko ◽  
O. A. Lipatnikova ◽  
L. L. Demina ◽  
M. D. Kravchishina ◽  
T. N. Lubkova
Keyword(s):  
Black Sea ◽  
Bottom Sediments ◽  
Vertical Section ◽  
Water Layer ◽  
Enrichment Factors ◽  
Trace Element Composition ◽  
The Black Sea ◽  
Bottom Water Layer ◽  
Sea Bottom ◽  
Significant Enrichment

The trace element composition of the vertical section of the Black Sea bottom sediments was studied. Based on the calculated enrichment factors relative to the average composition of the earth’s crust, it was shown that a lithogenic source is predominant for most trace elements. Significant enrichment was obtained for Ca and Sr (due to bioaccumulation) and for S, As and Mo (as a result of hydrogen sulfide contamination processes and the influence of mud volcanoes). A specific conditions of sedimentation were estimated based on the elements’ ratios which indicate: a presence of exhalation components in the deposits (Fe+Mn/Ti), a range of transport of terrigenous material (Ti/Zr) were estimated; paleoreconstruction of salinity (Corg/S), as well as redox conditions in the bottom water layer (Mn/Fe, Mo/Mn, V/(V+Ni), V/Mn).

scholarly journals Ecological–microbiological studies of lake Beloe in winter and spring with the use of innovation test-systems

2019 ◽  
Vol 46 (6) ◽  
pp. 621-628
Author(s):  
I. V. Mosharova ◽  
V. V. Il’inskii ◽  
S. A. Mosharov ◽  
A. Yu. Akulova
Keyword(s):  
Chlorophyll A ◽  
Bottom Water ◽  
Water Layer ◽  
Coliform Bacteria ◽  
Microbial Count ◽  
Bacterial Cells ◽  
Chlorophyll A Concentration ◽  
Bottom Water Layer ◽  
Test Systems ◽  
Microbiological Characteristics

Chlorophyll a concentration, the total abundance of bacteria, the number of bacterial cells with active metabolism, and the abundance of saprotrophic bacteria were studied in the surface and bottom water layers of Lake Beloe in winter and spring 20152016. The abundance of sanitary-indicator microorganisms was determined for the first time with the use of Petrifilm test-systems (3MTM Petrifilm). In most cases, Lake Beloe water in spring and winter was found to correspond to eutrophic level (in terms of chlorophyll a concentration in water) and polysaprobic status (in terms of microbiological indices). By its sanitary-microbiological characteristics, the lake is clearthe values of the total microbial count, determined with the use of test-systems 3M Petrifilm Aqua (AQHC), were 1000 CFU/mL, and the abundance of coliform bacteria, determined with the use of test-systems 3M Petrifilm Aqua (AQСC), varied from 20 to 135 CFU/100 mL. Coliform bacteria were mostly found in the bottom water layer. It was shown that, in the organization of ecologicalmicrobiological studies, special attention is to be paid to the bottom horizons of water bodies.

scholarly journals Changes in the concentration of selected water quality parameters in Lake Starzec in the vegetation periods / Zmiany stężenia wybranych wskaźników jakości wody w jeziorze Starzyc w okresach wegetacyjnych

2012 ◽  
Vol 17 (1) ◽  
pp. 53-59
Author(s):  
Piotr Wesołowski ◽  
Adam Brysiewicz
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Bottom Water ◽  
Water Layer ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Ammonium Ions ◽  
Bottom Water Layer ◽  
The Third ◽  
Lake Waters

Abstract Studies were carried out in the years 2008-2010 in Lake Starzyc, zachodniopomorskie voivodship. The aim was to determine differences in the concentrations of selected water quality parameters between particular months of the vegetation seasons 2008-2010. Monthly mean concentrations of dissolved oxygen between April and October were by 1.91 g O2m-3 higher in surface than in near-bottom water layer. Differences in the concentration of dissolved oxygen were also noted between particular months. Recorded concentrations fell within the range required for lake waters of the first and second water quality. Concentrations of mineral nitrogen in the years 2008-2010 corresponded to those of the third class of water quality and phosphorus concentrations exceeded this standard. Concentrations of ammonium ions did not exceed the values permitted for the second water quality class.

Sign in / Sign up

Export Citation Format

Share Document