scholarly journals Discussions and practices on the framework of monitoring system in eutrophic lakes and reservoirs

2020 ◽  
Vol 32 (5) ◽  
pp. 1396-1405
Author(s):  
DUAN Hongtao ◽  
◽  
WAN Nengsheng ◽  
QIU Yinguo ◽  
LIU Gang ◽  
...  
Keyword(s):  
Monitoring System ◽  
Eutrophic Lakes ◽  
Lakes And Reservoirs

scholarly journals Rapid adaptation of harmful cyanobacteria to rising CO2

2016 ◽  
Vol 113 (33) ◽  
pp. 9315-9320 ◽  
Author(s):  
Giovanni Sandrini ◽  
Xing Ji ◽  
Jolanda M. H. Verspagen ◽  
Robert P. Tann ◽  
Pieter C. Slot ◽  
...  
Keyword(s):  
Cyanobacterial Bloom ◽  
Eutrophic Lake ◽  
Cyanobacterial Blooms ◽  
High Flux ◽  
Flux Rate ◽  
Eutrophic Lakes ◽  
Field Evidence ◽  
Evolutionary Changes ◽  
Lakes And Reservoirs ◽  
Harmful Cyanobacterial Blooms

Rising atmospheric CO2 concentrations are likely to affect many ecosystems worldwide. However, to what extent elevated CO2 will induce evolutionary changes in photosynthetic organisms is still a major open question. Here, we show rapid microevolutionary adaptation of a harmful cyanobacterium to changes in inorganic carbon (Ci) availability. We studied the cyanobacterium Microcystis, a notorious genus that can develop toxic cyanobacterial blooms in many eutrophic lakes and reservoirs worldwide. Microcystis displays genetic variation in the Ci uptake systems BicA and SbtA, where BicA has a low affinity for bicarbonate but high flux rate, and SbtA has a high affinity but low flux rate. Our laboratory competition experiments show that bicA + sbtA genotypes were favored by natural selection at low CO2 levels, but were partially replaced by the bicA genotype at elevated CO2. Similarly, in a eutrophic lake, bicA + sbtA strains were dominant when Ci concentrations were depleted during a dense cyanobacterial bloom, but were replaced by strains with only the high-flux bicA gene when Ci concentrations increased later in the season. Hence, our results provide both laboratory and field evidence that increasing carbon concentrations induce rapid adaptive changes in the genotype composition of harmful cyanobacterial blooms.

scholarly journals Sustainable Management of Eutrophic Lakes and Reservoirs

2017 ◽  
Vol 08 (04) ◽  
pp. 436-463 ◽  
Author(s):  
Tyler Wagner ◽  
Larry E. Erickson
Keyword(s):  
Sustainable Management ◽  
Eutrophic Lakes ◽  
Lakes And Reservoirs

scholarly journals Carbon and nitrogen recycling during cyanoHABs in dreissenid-invaded and non-invaded US midwestern lakes and reservoirs

Hydrobiologia ◽  
2019 ◽  
Vol 847 (3) ◽  
pp. 939-965 ◽  
Author(s):  
Trinity L. Hamilton ◽  
Jessica R. Corman ◽  
Jeff R. Havig
Keyword(s):  
Nutrient Cycling ◽  
Nitrogen Cycling ◽  
Carbon Cycling ◽  
Microbial Community Composition ◽  
Freshwater Ecosystems ◽  
Rrna Gene ◽  
Eutrophic Lakes ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Cycling ◽  
Lakes And Reservoirs

AbstractLakes and reservoirs play key roles in global carbon cycling, especially as a carbon sink. Enrichment of nutrients in lakes and reservoirs (eutrophication) and rising global temperatures favors the proliferation of bloom-forming cyanobacteria. Harmful blooms of cyanobacteria (cyanoHABs) alter carbon and nutrient cycling in freshwater ecosystems. Some evidence suggests the introduction or establishment of invasive mussel species (i.e., Dreissena spp.) also favor cyanoHAB formation through selective filter feeding, a process through which they may also impact biogeochemical processes including carbon cycling and sequestration. However, few studies have considered the combined effects of invasive mussels and cyanoHABs on carbon and nitrogen cycling in freshwater ecosystems. Here, we examined microbial community composition and biogeochemical attributes (including carbon and nitrogen stable isotopes) in eutrophic lakes, reservoirs, and rivers in western Ohio, eastern Indiana, and northern Kentucky during the cyanobacterial bloom period of the summer of 2015. Our samples include both sites impacted by invasive mussels and those where invasive mussels have not yet been observed. Based on 16S and 18S rRNA gene sequence analysis, we found that cyanobacterial and algal communities varied across sites and were most closely related to habitat (sediment or water column sample) and site, regardless of the presence of invasive mussels or other environmental factors. However, we did find evidence that invasive mussels may influence both carbon and nitrogen cycling. While the results are based on a single time point sampling, they highlight the interactions of multiple environmental stressors in aquatic ecosystems and the critical need for more temporally intensive studies of carbon and nutrient cycling in bloom- and mussel-impacted waters.

Crustacean zooplankton in lakes and reservoirs of temperate and tropical regions: variation with trophic status

2005 ◽  
Vol 62 (2) ◽  
pp. 348-361 ◽  
Author(s):  
Ricardo Pinto-Coelho ◽  
Bernadette Pinel-Alloul ◽  
Ginette Méthot ◽  
Karl E Havens
Keyword(s):  
Species Richness ◽  
Chlorophyll A ◽  
Total Phosphorus ◽  
Trophic Status ◽  
Zooplankton Community ◽  
Crustacean Zooplankton ◽  
Eutrophic Lakes ◽  
Crustacean Species ◽  
Tropical Regions ◽  
Lakes And Reservoirs

The influence of trophic status on the crustacean zooplankton community was investigated in lakes and reservoirs in temperate and subtropical-tropical regions. We tested if there is a consistent relationship between crustacean species richness, assemblages, and abundance and trophic indices such as total phosphorus and chlorophyll a. We also examined if these patterns differ between regions. Cumulative species richness and assemblages varied among regions. The greatest number of crustacean species was found in the temperate oligotrophic region with the largest number of lakes sampled. However, cumulative species richness was similar in temperate and subtropical–tropical regions when comparing subsets with a similar number of lakes and reservoirs. The relationships between species richness and latitude or trophic status were difficult to assess owing to imbalance among regions in number of lakes and reservoirs sampled and to biogeography and fish predation potential influences. Trophic status was associated with changes in abundance of all major crustacean zooplankton groups. Eutrophic ecosystems supported greater crustacean abundances at all latitudes. However, cladocerans and cyclopoids were more abundant in eutrophic lakes and reservoirs, whereas calanoids were more abundant in temperate oligotrophic lakes. Total phosphorus was found to be a better predictor of the biomass of major crustacean groups than chlorophyll a in all regions.

A bibliometric review of nitrogen research in eutrophic lakes and reservoirs

2018 ◽  
Vol 66 ◽  
pp. 274-285 ◽  
Author(s):  
Xiaolong Yao ◽  
Yunlin Zhang ◽  
Lu Zhang ◽  
Yongqiang Zhou
Keyword(s):  
Eutrophic Lakes ◽  
Bibliometric Review ◽  
Lakes And Reservoirs

scholarly journals Seasonal variation of Microcystis aeruginosa and factors related to blooms in a deep warm monomictic lake in Mexico

2021 ◽  
Vol 80 (2) ◽  
Author(s):  
Eloy Montero ◽  
Gabriela Vázquez ◽  
Margarita Caballero ◽  
Mario E. Favila ◽  
Fernando Martínez-Jerónimo
Keyword(s):  
Seasonal Variation ◽  
Water Column ◽  
Microcystis Aeruginosa ◽  
Phytoplankton Community ◽  
Inorganic Nitrogen ◽  
Seasonal Dynamic ◽  
Cyanobacterial Blooms ◽  
Tropical Lakes ◽  
Eutrophic Lakes ◽  
Lakes And Reservoirs

The occurrence of cyanobacterial blooms has increased globally over the last decades, with the combined effect of climate change and eutrophication as its main drivers. The seasonal dynamic of cyanobacterial blooms is a well-known phenomenon in lakes and reservoirs in temperate zones. Nevertheless, in the tropics, most studies have been performed in shallow and artificial lakes; therefore, the seasonal dynamic of cyanobacterial blooms in deep and eutrophic tropical lakes is still under research. We studied the seasonal variation of the phytoplankton community and the factors associated with Microcystis aeruginosa blooms along the water column of Lake Alberca de Tacámbaro, a warm monomictic crater lake located in Mexico, during 2018 and 2019. According to previous studies performed in 2006 and 2010, this lake was mesotrophic-eutrophic, with Chlorophyta and Bacillariophyta as the dominant groups of the phytoplankton community. During 2018 and 2019, the lake was eutrophic and occasionally, hypertrophic, a phenomenon likely associated with the increase of farmland area around the lake. The dominant species was M. aeruginosa, forming blooms from the surface to 10 m depth in winter, in the hypolimnion in spring and summer, and along the full water column in autumn. These findings suggest that M. aeruginosa in Lake Alberca de Tacámbaro displays seasonal and spatial population dynamics. Total phosphorus, dissolved inorganic nitrogen, water temperature and photosynthetically active radiation were the environmental factors related to M. aeruginosa blooms. Our results suggest that the changes in the structure of the phytoplankton community through time, and M. aeruginosa blooms in Lake Alberca de Tacámbaro, are mainly related to changes in land use from forest to farmland in areas adjacent to the lake, which promoted its eutrophication in the last years through runoffs. Comparative studies with other deep and eutrophic lakes will allow us to gain a deeper understanding of the dynamic of cyanobacterial blooms in natural and artificial water reservoirs strongly stressed by human activities.

scholarly journals ESTUDO DA MITIGAÇÃO DA EUTROFIZAÇÃO DO AÇUDE VELHO PELA ELETRÓLISE

2014 ◽  
Vol 39 (1) ◽  
pp. 107
Author(s):  
Luciano Nascimento ◽  
Lourdes Cristina Lucena Agostinho ◽  
Bernadete F. Cavalcanti
Keyword(s):  
Chlorophyll A ◽  
Nitrate Removal ◽  
Urban Lake ◽  
Anaerobic Conditions ◽  
Algae Bloom ◽  
Eutrophic Lakes ◽  
Aluminum Sheets ◽  
Physical Chemical ◽  
Sampling Points ◽  
Lakes And Reservoirs

In eutrophic lakes and reservoirs the green – blue algae bloom contributes to increase the chlorophyll “a” concentration, deteriorates the water quality with anaerobic conditions in the deepest waters and provokes scum formation among other impacts. Due to the occurrence of irregular nitrification events in the waters of the polluted urban lake, Açude Velho which is located in Campina Grande, PB during the dry season, it was analyzed the performance of the electrolytic process in treating these waters. For the electrolysis treatment it was built, in laboratory scale, a 2 liters reactor where it was inserted an electrolytical assemblage made of steel and aluminum sheets. Samples were obtained in eight sampling points in the lake. The following physical, chemical and organic parameters were obtained: color, turbidity, pH, Alkalinity, calcium, chloride, nitrate, total phosphorus and chlorophyll “a”. After 15 minutes of electrolysis, it was applied 45 minutes of sedimentation to the effluent. The results showed that the alumen production by ion pairing with the water sulphate concentration provoked the water impurities flotation. It was also observed a total denitrification (100% nitrate removal) with N2 liberation to the environment. Phosphorus and chlorophyll “a” removal was also significant.

Are elusive anaerobic pathways key methane sinks in eutrophic lakes and reservoirs?

2017 ◽  
Vol 134 (1-2) ◽  
pp. 29-39 ◽  
Author(s):  
Daniel C. Reed ◽  
Bridget R. Deemer ◽  
Sigrid van Grinsven ◽  
John A. Harrison
Keyword(s):  
Eutrophic Lakes ◽  
Lakes And Reservoirs

Monitoring des Arzneimittelmissbrauchs 2006 bei Klienten von Suchtberatungsstellen (PHAR-MON)

2007 ◽  
Vol 53 (7) ◽  
pp. 65-77 ◽  
Author(s):  
Susanne Roesner ◽  
Heinrich Küfner
Keyword(s):  
Monitoring System

<span class="fett">Hintergrund und Zielsetzung:</span> PHAR-MON ist ein Monitoring-System, das die auf dem deutschen Markt befindlichen Arzneimittel in ihrer Bedeutung für die Entwicklung von Missbrauch und Abhängigkeit in Suchtberatungsstellen überwacht. </p><p> <span class="fett">Methodik:</span> Klienten ambulanter Beratungsstellen werden im Rahmen der Standarddokumentation zu ihrem Arzneimittelkonsum befragt und Fälle eines abhängigen Konsums, eines schädlichen Gebrauchs oder eines Missbrauchs in PHAR-MON dokumentiert. </p><p> <span class="fett">Ergebnisse:</span> Im Jahr 2006 wurden insgesamt 448 Meldungen von 276 überwiegend alkohol- und drogenabhängigen Klienten in das Monitoring einbezogen. Tranquilizer vom Benzodiazepin-Typ wurden in allen Klientengruppen mit Anteilen zwischen 29,1 % und 35,3 % am häufigsten dokumentiert. An benzodiazepinabhängige Klienten werden zunehmend auch Nicht-Benzodiazepin-Hypnotika verordnet. Bei opioidabhängigen Klienten war im Zeitraum der letzten fünf Jahre ein Anstieg im missbräuchlichen Substitutionsmittelkonsum von 14,9 % auf 33,8 % zu verzeichnen. </p><p> <span class="fett">Schlussfolgerungen:</span> Das Risiko gefährlicher Wechselwirkungen zwischen Arzneimitteln mit Alkohol und Drogen sollte stärker als bisher in die ärztliche Verordnungsentscheidung einbezogen werden.

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