MONITORING OF PHYTOPLANKTON STATUS IN LAKE SEVAN (ARMENIA) IN 2018

2019 ◽  
Vol 53 (3 (250)) ◽  
pp. 206-211
Author(s):  
A.A. Hovsepyan ◽  
A.S. Mamyan ◽  
T.G. Khachikyan ◽  
I.V. Tikhonova ◽  
O.I. Belykh ◽  
...  
Keyword(s):  
Water Samples ◽  
Algal Blooms ◽  
Phytoplankton Community ◽  
Current Status ◽  
Lake Ecosystem ◽  
Nutrient Pollution ◽  
Algae Bloom ◽  
Lake Sevan ◽  
Mineral Phosphorus ◽  
Bluegreen Algae

The current status of phytoplankton community in Lake Sevan (LS) was investigated. Water samples for phytoplankton and mineral phosphorus analyses were collected seasonally (spring–fall) in 2018. The results of the study showed that the unstabilized processes and nutrient pollution of the lake ecosystem led to bluegreen algae bloom in July. All of this caused ecological and toxicological risks to the lake ecosystem and the environment and may lead to further algal blooms in LS.

scholarly journals Marine harmful algal blooms (HABs) in the United States: History, current status and future trends

Harmful Algae ◽  
2021 ◽  
pp. 101975
Author(s):  
Donald M. Anderson ◽  
Elizabeth Fensin ◽  
Christopher J. Gobler ◽  
Alicia E. Hoeglund ◽  
Katherine A. Hubbard ◽  
...  
Keyword(s):  
United States ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
United States History ◽  
The United States ◽  
Current Status ◽  
Future Trends ◽  
States History

Current Status of Contamination by Persistent Organochlorines in the Lower Chao Phraya River, Thailand

1992 ◽  
Vol 25 (11) ◽  
pp. 17-24 ◽  
Author(s):  
M. S. Tabucanon ◽  
S. Watanabe ◽  
C. Siriwong ◽  
R. Boonyatumanond ◽  
S. Tanabe ◽  
...  
Keyword(s):  
Urban Area ◽  
Water Samples ◽  
Current Status ◽  
High Frequencies ◽  
Sediment Samples ◽  
Water And Sediment ◽  
Order Of Magnitude ◽  
Residue Levels ◽  
Chao Phraya River ◽  
Water And Sediment Samples

Water and sediment samples collected from the lower Chao Phraya River and a canal along the river during 1988 - 1991 were analyzed to determine the current status of contamination by organochlorine pesticides, such as HCHs, DDTs, aldrin, dieldrin and chlordanes. Aldrin and dieldrin had high frequencies of occurrence in water samples. The medians of concentrations of these pesticides were approximately one order of magnitude larger than total HCHs and total DDTs. Residue levels of these pesticides varied significantly. Relatively higher levels of aldrin were observed in the upstream; in contrast, residue levels of DDTs were higher in urban area. These phenomena seem to relate to the spraying purpose of these pesticides. Decreasing trends in the residue levels of pesticides during monitoring periods, however, were not observed clearly. Residue levels of organochlorines in the sediment samples were in the order of magnitude of PCBs, DDTs, chlordanes and HCHs.

scholarly journals Response to Comments for “An Ecological Function Approach to Managing Harmful Cyanobacteria in Three Oregon Lakes: Beyond Water Quality Advisories and Total Maximum Daily Loads (TMDLs)”, Water 2019, 11, 1125

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2484
Author(s):  
Eric Hall ◽  
Robert Hall ◽  
Joan Aron ◽  
Sherman Swanson ◽  
Michael Philbin ◽  
...  
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Euphotic Zone ◽  
Higher Order ◽  
Prey Fish ◽  
Algae Bloom ◽  
Salmonid Species ◽  
Maximum Daily Loads ◽  
Tui Chub ◽  
Total Maximum

The commenter’s key argument is that Diamond Lake’s problem is strictly one of biomass, i.e., introduction of the invasive Tui Chub fish. There are a few things to note in that respect. The Tui Chub is a bait fish. It is a lower-order prey fish for higher-order trout/salmonid species. Tui Chub is zooplanktivorous. Since the Tui Chub feed on zooplankton, if they themselves are prey for other species (or are being “culled” by artificial means), and there is no other entity to feed on the plankton and algae, the result would be a mass of plankton/algae bloom (i.e., harmful algal blooms (HABs)). This would lead to anoxic conditions in the euphotic zone, which puts even more stress on the higher-order trout/salmonid species. Our work found that the biological community (i.e., invertebrates and fish) are lagging indicators (i.e., response indicators).

Harmful algal blooms and associated fisheries damage in East Asia: Current status and trends in China, Japan, Korea and Russia

Harmful Algae ◽  
2020 ◽  
pp. 101787 ◽  
Author(s):  
Setsuko Sakamoto ◽  
Weol Ae Lim ◽  
Douding Lu ◽  
Xinfeng Dai ◽  
Tatiana Orlova ◽  
...  
Keyword(s):  
East Asia ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Current Status ◽  
Status And Trends

Enhanced Activity of Alkaline Phosphatases - Phytoplankton Response to Epilimnetic Phosphorus Depletion

1993 ◽  
Vol 28 (6) ◽  
pp. 15-24 ◽  
Author(s):  
J. Vrba ◽  
J. Komárkova ◽  
V. Vyhnálek
Keyword(s):  
Algal Blooms ◽  
Phytoplankton Community ◽  
Phytoplankton Bloom ◽  
Soluble Reactive Phosphorus ◽  
High Input ◽  
Alkaline Phosphatases ◽  
Spring Phytoplankton Bloom ◽  
Reactive Phosphorus ◽  
Longitudinal Sampling ◽  
Phosphorus Depletion

The stratified, eutrophic ůímov Reservoir (South Bohemia) receives a considerable input of phosphorus. However, phytoplankton development in the epilimnion has often been P-limited (<5 µg.1−1 of soluble reactive phosphorus) during spring and summer when algal maxima are observed. Alkaline phosphatase activity (APA) was measured in the epilimnion (0-2 m) using a fluorimetric method. The seasonal course of APA (range 6.7-726.7 nmol.1−1.h−1) roughly followed that of chlorophyll a (r2 = 0.45) in 1990. During algal blooms, a significant percentage of total APA was found in the 2.5-100 µ µm fraction containing most of the algae. Very similar relationships were found by a longitudinal sampling of the reservoir epilimnion during the spring phytoplankton bloom in 1991, despite high P concentrations in the reservoir's tributary. Hence, phytoplankton can be P-limited in the epilimnion, even in a eutrophic reservoir with a high input of P. This study shows that the phytoplankton community might adapt to phosphorus depletion by changing species composition and/or by increasing APA.

scholarly journals Characteristics of the phytoplankton community and bioaccumulation of heavy metals during algal blooms in Xiangjiang River (Hunan, China)

2011 ◽  
Vol 54 (10) ◽  
pp. 931-938 ◽  
Author(s):  
Jie Li ◽  
FuLi Peng ◽  
DongBo Ding ◽  
ShuBing Zhang ◽  
DeLiang Li ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Algal Blooms ◽  
Phytoplankton Community ◽  
Xiangjiang River

scholarly journals FOSS4G BASED HIGH FREQUENCY AND INTEROPERABLE LAKE WATER-QUALITY MONITORING SYSTEM

2021 ◽  
Vol XLVI-4/W2-2021 ◽  
pp. 25-29
Author(s):  
M. Cannata ◽  
D. Strigaro ◽  
F. Lepori ◽  
C. Capelli ◽  
M. Rogora ◽  
...  
Keyword(s):  
Open Source ◽  
Monitoring System ◽  
High Frequency ◽  
Algal Blooms ◽  
Weather Conditions ◽  
Water Quality Monitoring ◽  
Lake Ecosystem ◽  
Lake Water Quality ◽  
Lake Ecosystems ◽  
Lake Lugano

Abstract. Climate, together with human activities, is changing the natural dynamics in lake ecosystems and adding new challenges to the management of water resources. Recent studies on Lake Lugano, in Switzerland, showed for instance that the increased water temperature influence other processes such as lake stratification and mixing dynamics, algal blooms, colonisation by alien species, affecting the lake ecosystem as a whole. In such situation, real-time systems with high frequency measurements, together with the traditional discrete monitoring, can help in understanding dynamics and processes occurring on short time scales. To this aim, an open monitoring system largely composed by open source components is being developed for the high frequency monitoring of Lake Lugano. The system relies on the open source software istSOS either on the server and node sides applying the edge computing paradigm which is more and more adopted in the Internet of Things field. The implementation collects temperature and dissolved oxygen data from sensors positioned at six different depths of the lake and transmits them using the LoRa radio frequency to a data warehouse. At server side, the software architecture adopts the evolving technology based on containers where services can be grouped in a compose and easily deployed on a server. This paper aims to describe the adopted open source technology and demonstrate that it can be successfully used also in environmental monitoring where the accessibility is limited and the weather conditions can be unpredictable.

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