Limnological Review

814 KiB

Open AccessArticle

Rapid Monitoring of Cyanobacteria in Lakes—A Case Study in the Wel River Catchment, Poland

by Agnieszka Pasztaleniec, Andrzej Hutorowicz and Agnieszka Napiórkowska-Krzebietke

Limnol. Rev. 2020, 20(1), 41-49; https://doi.org/10.2478/limre-2020-0005 - 16 Jul 2020

Cited by 2 | Viewed by 306

The purpose of the study was to ascertain the effect of cyanobacterial abundance and its taxonomic structure on the results of measurements made by a fluorometric device designed to detect in situ chlorophyll a and phycocyanin. A multiparameter water quality probe was tested [...] Read more.

The purpose of the study was to ascertain the effect of cyanobacterial abundance and its taxonomic structure on the results of measurements made by a fluorometric device designed to detect in situ chlorophyll a and phycocyanin. A multiparameter water quality probe was tested at 10 lakes located in the Wel River catchment. We found a strong correlation between the chlorophyll a concentration determined by laboratory procedure (CHL-a) and that obtained as a result of the probe measurements (YSI CHL-a) (R = 0.78) as well as between the YSI CHL-a and the total phytoplankton biomass (R = 0.73), whereas YSI CHL-a was not a good predictor of cyanobacterial biomass (R = 0.24). The phycocyanin recorded by the probe was proportional to the total biomass of cyanobacteria (R = 0.86); however, this cyanobacterial taxonomic structure influenced the fluorometric signal. Nevertheless, our study showed significant differentiation of phycocyanin measurement distribution at different levels of cyanobacterial abundance (<2 mg L⁻¹, between 2 and 10 mg L⁻¹, and >10 mg L⁻¹), which indicates that the PC-YSI measurements are valuable in the detection of increased risk of exceeding health alert thresholds recommended by the WHO. Full article

634 KiB

Open AccessArticle

The Use of Numerical Methods in the Design of a Formula That Returns the Surface of the Leaves of Phragmites australis (Cav.) Trin. Ex Steud.

by Katarzyna Krzyżanowska and Paweł Krzyżanowski

Limnol. Rev. 2020, 20(1), 33-39; https://doi.org/10.2478/limre-2020-0004 - 16 Jul 2020

Viewed by 245

Abstract

The paper presents the results of calculations and a verification of numerical models developed for estimating the surface of leaves of the common reed (Phragmites australis (Cav.) Trin. Ex Steud.). The research sample consisted of 137 leaves collected from [...] Read more.

The paper presents the results of calculations and a verification of numerical models developed for estimating the surface of leaves of the common reed (Phragmites australis (Cav.) Trin. Ex Steud.). The research sample consisted of 137 leaves collected from the rush zone of Lake Raduńskie Górne in 2018. The total area of leaves obtained for testing was 1932.3 cm². To derive a formula that returns the surface of common reed foliage regression models were used–MLR (Multiple Linear Regression) and SLR (Stepwise Linear Regression). It has been shown that the measurement of basic leaf dimensions (i.e. length–L, mid-width–WM and maximum width–WX) makes it possible to define an empirical formula which, with an average accuracy of 99.9%, allows the real surface of leaves to be estimated. The modelling results were compared with formulas currently used in practice, and the measurement errors were determined using these formulas. It has been shown that the formulas used to date are subject to RMSE to the value of 1.19–2.52. The application of the developed formula (A = 0.4486 − 0.046 L + 7.9267 WM − 5.8121 WX + 0.5853 L • WX) will significantly reduce errors in leaf surface estimation (RMSE = 0.86) and thus the amount of reed transpiration and evapotranspiration, especially in the case of handling small samples (number of leaves and measurements). Full article

2329 KiB

Open AccessArticle

On the Use of Validated Ocean Models to Investigate the Evolution of Primary Productivity in the Levantine Sea

by Malak Kanj and Ali Fadel

Limnol. Rev. 2020, 20(1), 23-31; https://doi.org/10.2478/limre-2020-0003 - 16 Jul 2020

Cited by 2 | Viewed by 283

Abstract

Marine ecosystems are vital natural resources that contribute to the global biogeochemical cycle, food, and energy production. In order to monitor and evaluate variations of different factors for decision making processes, validated ecosystem models were used in this study to analyze the evolution [...] Read more.

Marine ecosystems are vital natural resources that contribute to the global biogeochemical cycle, food, and energy production. In order to monitor and evaluate variations of different factors for decision making processes, validated ecosystem models were used in this study to analyze the evolution of different variables: temperature and salinity concentrations (from 1987 to 2014) and nitrate, phosphate, dissolved oxygen, chlorophyll concentrations, and phytoplankton biomass (from 1999 to 2014) in four sites (from 0 to 66 m depth) along the Levantine Sea: Lebanon, Turkey, Egypt and in the Open Sea. Principal component analysis and TRIX were then applied. Spatio-temporal analysis and PCA results showed that phytoplankton biomass is temporally affected by temperature and nutrients (in all stations) as well as salinity in some cases, in addition to its decrease with depth. TRIX analysis showed that all stations had higher primary productivity, in the first half of the year (January-May). Intense anthropogenic activities in Turkey and Egypt have altered the ecosystem’s stability and affected the phytoplankton biomass. Full article

1293 KiB

Open AccessArticle

Nickel Phytoremediation Potential of Some Plant Species of the Lower Dir, Khyber Pakhtunkhwa, Pakistan

by Muhammad A. Sajad, Muhammad S. Khan, Saraj Bahadur, Muhammad Shuaib, Abdul Naeem, Wajid Zaman and Hazrat Ali

Limnol. Rev. 2020, 20(1), 13-22; https://doi.org/10.2478/limre-2020-0002 - 16 Jul 2020

Cited by 23 | Viewed by 439

Abstract

Nickel is a known hepatotoxic, haemotoxic, pulmonary toxic, nephrotoxic, reproductive toxic, carcinogenic, phytotoxic and neurotoxic agent. The adverse ecological impacts from unnecessary heavy metals include contamination of water and soil which pose serious threats to human health. This study was conducted to screen [...] Read more.

Nickel is a known hepatotoxic, haemotoxic, pulmonary toxic, nephrotoxic, reproductive toxic, carcinogenic, phytotoxic and neurotoxic agent. The adverse ecological impacts from unnecessary heavy metals include contamination of water and soil which pose serious threats to human health. This study was conducted to screen plants for the phytoremediation of nickel from sixty-one sites of the Lower Dir. Nickel-metal was analyzed in the soil, roots and shoots of plants. The total concentration of nickel in soil, roots and shoots was found to be in the range of 1.03–18.98, 12.63–540.73 and 12.00–295.86 mg kg⁻¹ dry weight basis (DW) respectively. The highest nickel contents were present in the roots of Xanthium strumarium (540.73) and shoots of Bryophyllum daigremontianum (295.86). None of the plant species were identified as hyper accumulators for nickel but based on BCF, TF and BAC values most of the species showed feasibility for its phytoextraction and phytostabilization. Xanthium strumarium, Filago hurdwarica, Ranunculus arvensis, Medicago lupulina, Cannabis sativa, Geranium rotundifolium and Cerastium glomeratum are suggested for the phytostabilization of nickel whereas Bryophyllum daigremontianum, Rosularia adenotricha, Iris germanica, Asplenium dalhousiae and Isatis tinctoria for the phytoextraction of soil contaminated with nickel. Full article

2108 KiB

Open AccessArticle

Spectral–Time Analysis of Cycle Fluctuations in Lake Water Levels in Belarus and Poland

by Alexander A. Volchak, Ivan Kirvel, Adam Choiński, Sergey I. Parfomuk, Pavel Kirvel and S. Sidak

Limnol. Rev. 2020, 20(1), 3-11; https://doi.org/10.2478/limre-2020-0001 - 16 Jul 2020

Cited by 1 | Viewed by 275

Abstract

On the basis of the mean volume of annual water levels of 25 lakes (9 Belarusian and 16 Polish) over a period of 55 years (1956–2010) spectral time analysis of water fluctuations has been executed. The choice of the lakes was based on [...] Read more.

On the basis of the mean volume of annual water levels of 25 lakes (9 Belarusian and 16 Polish) over a period of 55 years (1956–2010) spectral time analysis of water fluctuations has been executed. The choice of the lakes was based on two factors, i.e., the continuous period of observation and insignificant anthropogenic influence. The complex analysis of water level fluctuation cycles has shown that for Belarus the cycles observed most often were 3, 5 and 10-year cycles. Polish lakes also have three cycles, but in the majority of them they amount to 5 and 10-years. It can be assumed that this is impacted by the continental climate growing to the east. Most probably it is one of the key factors defining the diversity of water fluctuations in all the analyzed lakes. Full article

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Limnol. Rev., Volume 20, Issue 1 (March 2020) – 5 articles , Pages 3-49

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