Water quality and species diversity of inland waters in Latvia

1998 ◽  
Vol 26 (3) ◽  
pp. 1209-1211
Author(s):  
P. Cimdinš ◽  
M. Klavinš
Author(s):  
Sina Keller ◽  
Philipp Maier ◽  
Felix Riese ◽  
Stefan Norra ◽  
Andreas Holbach ◽  
...  

Inland waters are of great importance for scientists as well as authorities since they are essential ecosystems and well known for their biodiversity. When monitoring their respective water quality, in situ measurements of water quality parameters are spatially limited, costly and time-consuming. In this paper, we propose a combination of hyperspectral data and machine learning methods to estimate and therefore to monitor different parameters for water quality. In contrast to commonly-applied techniques such as band ratios, this approach is data-driven and does not rely on any domain knowledge. We focus on CDOM, chlorophyll a and turbidity as well as the concentrations of the two algae types, diatoms and green algae. In order to investigate the potential of our proposal, we rely on measured data, which we sampled with three different sensors on the river Elbe in Germany from 24 June–12 July 2017. The measurement setup with two probe sensors and a hyperspectral sensor is described in detail. To estimate the five mentioned variables, we present an appropriate regression framework involving ten machine learning models and two preprocessing methods. This allows the regression performance of each model and variable to be evaluated. The best performing model for each variable results in a coefficient of determination R 2 in the range of 89.9% to 94.6%. That clearly reveals the potential of the machine learning approaches with hyperspectral data. In further investigations, we focus on the generalization of the regression framework to prepare its application to different types of inland waters.


Author(s):  
Erwin Theofilius ◽  
Zahidah Hasan ◽  
Asep Agus Handaka ◽  
Herman Hamndani

This study conducted to determine the water quality of Situ Ciburuy based on the structure of the gastropod community as a bioindicator. The survey method used in this study based on collecting data directly at the research area (purpose sampling method).  For instance, species and density of gastropods were descriptively analyzed, using diversity index and evenes index. For instance, The findings showed that level of water quality in  Situ Ciburuy based on gastropods bioindicators was lightly polluted. That is indicated by the low to moderate diversity of gastropods, which ranges from 1.31-1.98. The Shannon evenness index (0,73-0.95) revealed low gastropod species diversity in Situ Ciburuy, indicating low evenness of gastropod in Situ Ciburuy.


2021 ◽  
Vol 267 ◽  
pp. 01035
Author(s):  
Ziqi Zhang ◽  
Lei Yang ◽  
Dongxu Han ◽  
Hongyan Shen

An investigation of phytoplankton community and water quality for M River was conducted in December 2019.The results showed that 38 species of phytoplankton belonging to 6 phyla and 26 genera were collected. Among them, Bacillariophyta is the richest species, which accounted for 34.21%, followed by Cyanophyta with 26.32% and Chlorophyta with 28.95%. The density of phytoplankton was 63.0*106 inds/L which indicated as eutrophic water body. The highest density was Bacillariophyta, accounting for 51.03%. The Shannon-Wiener diversity index (H’) varied from 1.34 to 2.24, the Margalef Species diversity index (d) varied from 2.71 to 3.85, and the Pielou evenness index (J) varied from 0.38 to 0.67. According to the integrative analysis results of H’, d and J, M River water quality belongs to oligo-polluted, but individual sites belong to meso-polluted.


2019 ◽  
Vol 55 (11) ◽  
pp. 10012-10025 ◽  
Author(s):  
Matthew R. V. Ross ◽  
Simon N. Topp ◽  
Alison P. Appling ◽  
Xiao Yang ◽  
Catherine Kuhn ◽  
...  

2013 ◽  
Vol 807-809 ◽  
pp. 61-65
Author(s):  
Yuan Gao

Analysis of 4 sampling surveys on Jiangsu Shilianghe reservoir in May, July and October of 2011 and January of 2012, 109 species of algae belonging to 7 divisions were totally identified. The green algae and diatoms were the main species while Euglena and Cryptomonas were rare. The algal cell density in each season was compared as follows: summer (63.77 × 1000000 / L) > autumn (61.87 ×1000000 / L) > spring (43.31 ×1000000 / L) > winter (37.922 ×1000000 / L). Algae Shannon-Wiener index and Pielou indexes of each season were compared and described as follows: summer (2.71, 0.41) > winter (2.09, 0.32) > autumn (2.05, 0.31) > spring (1.85, 0.28). The Margalef indexes of each season were compared as follows: summer (1.51) > spring (1.38) > autumn (1.19) > winter (0.86). The water quality was assessed as α-medium pollution according to biological indicators. Sand mining, cages and obstruction between rivers and lakes may be the main reasons that lead to high algal cell density and low index of species diversity.


1984 ◽  
Vol 11 (4) ◽  
pp. 331-344 ◽  
Author(s):  
Frances B. Michaelis

Considerable public and political debate over the environmental consequences of large-scale operations associated with Tasmania's export forest industries prompted the present review and continuing field-studies. There are no known publications on the effect of forestry on inland waters of Tasmania, but relevant research in the Northern Hemisphere, the Australian mainland, and New Zealand, is summarized.Forest operations considered are roading, logging, and burning. In general, roading increases water-yield, reduces water quality, and modifies the physical structure of streams—particularly at bridge-sites. The impact of logging depends on the harvesting method used (generally, tractor and skidder-logging in Tasmania), the proportion of trees felled, the proportion of the catchment logged, and the precautions taken. However, stream-flows, sediment loads, nutrient levels, dissolved inorganic materials, and wood debris, all increase with logging. If riparian vegetation is cut, water temperature usually increases in summer and decreases slightly in winter, but temperature tolerances of most aquatic animals in Tasmania remain unknown. The effects of burning Australian forests are poorly understood, but there are changes in water-yield and a decrease in water quality.


2020 ◽  
Vol 10 (1) ◽  
pp. 63-75
Author(s):  
Natalia S. Pribylovskaya ◽  
Tatsiana P. Marchik ◽  
Ekaterina A. Taranova

On the example of the small Lososna river (Grodno, Belarus), the changes in the phytoplankton community in urbanized areas for the period 2015–2018 are shown and compared with the data previously obtained in 2008. The species diversity of the Lososna river phytoplankton was represented by 87 species from six divisions dominated by Chlorophyta and Bacillariophyta (the algocenosis is dominated by the chlorophytic-diatom complex). There was an increase in species diversity relative to 2008 (36 species), which indicates a positive dynamic of reducing the inflow of pollutants into the watercourse. The calculated saprobity indices correspond to the β-mesosaprobic type, which makes it possible to attribute the water of the Lososna river to the 4th rank and III class of water quality (satisfactory purity), and to characterize changes in the ecosystem as reversible.


Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2440
Author(s):  
Slaven Jozić ◽  
Vanja Baljak ◽  
Arijana Cenov ◽  
Dražen Lušić ◽  
Dominik Galić ◽  
...  

Europe is one of the leading tourist destinations where tourism is one of the key economic sectors. The quality of bathing waters is a very important factor when choosing a vacation destination. Croatia recognized this early and was one of the first Mediterranean countries to start systematic monitoring of bathing waters. On the other hand, monitoring of inland bathing waters is relatively new and includes a much smaller number of sites (41) compared to coastal waters (894). The aim of this paper was to summarize and analyze the water quality of inland and coastal bathing sites of Croatia, closer regions (non-EU Member States) and in the EU for the last decade. The share of excellent water quality in EU Member States increased by 10.1% and 6.6% for inland and coastal waters, respectively (2011–2020). Germany recorded the highest proportion of excellent water quality for inland waters (92.2%) and Cyprus for coastal waters (99.3%). Looking at the 10-year average of the proportion of bathing waters with excellent quality, the proportion of coastal bathing sites exceeds that of inland waters by 7.1%. It is clear that additional efforts should be made to improve the management and monitoring of inland waters.


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