scholarly journals Control of Algal Blooms in Eutrophic Water Using Porous Dolomite Granules

2017 ◽  
Vol 54 (2) ◽  
pp. 108-113 ◽  
Author(s):  
Jae-Hoon Huh ◽  
Young-Hoon Choi ◽  
Shin Haeng Lee ◽  
Sun Hee Cheong ◽  
Ji Whan Ahn
Keyword(s):  
Algal Blooms ◽  
Eutrophic Water

Odorous Substances and Cyanobacterial Toxins in Prairie Drinking Water Sources

1992 ◽  
Vol 25 (2) ◽  
pp. 147-154 ◽  
Author(s):  
S. L. Kenefick ◽  
S. E. Hrudey ◽  
E. E. Prepas ◽  
N. Motkosky ◽  
H. G. Peterson
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Algal Blooms ◽  
Algal Biomass ◽  
Cyanobacterial Blooms ◽  
Eutrophic Lakes ◽  
Cyanobacterial Toxins ◽  
Eutrophic Water ◽  
Odorous Substances ◽  
Water Uses

Algal blooms in eutrophic lakes have been regarded by some as primarily an aesthetic nuisance for recreational and drinking water uses despite well documented incidents of livestock and wildlife poisoning attributed to cyanobacterial toxins. A survey was conducted of three eutrophic, water supply lakes and eight rural dugouts experiencing cyanobacterial blooms. Biomass was characterized for dominant cyanobacterial genera and analyses were conducted for the hepatotoxins, microcystin LR and RR and the neurotoxin, anatoxin-a. Some water samples collected simultaneously were screened for geosmin, 2-methylisoborneol and β-cyclocitral. Results showed that microcystin LR (LD50 of 50 µg/kg in mice) was present in concentrations up to 500 µg/g of algal biomass and microcystin LR levels were generally related to the proportion of Microcystis in the collected algal biomass. There was no relationship between the presence of microcystin LR and the presence of any of the odour compounds. Consequently, cyanobacterial odour-causing compounds in water did not provide reliable warning of the presence of the microcystin LR in these cyanobacterial blooms.

Potential bioavailability of phosphorus in citrus orchard soil to Microcystis aeruginosa

2011 ◽  
Vol 63 (6) ◽  
pp. 1298-1302 ◽  
Author(s):  
Y. Okubo ◽  
T. Inoue ◽  
K. Yokota ◽  
K. Tsushima
Keyword(s):  
Microcystis Aeruginosa ◽  
Algal Blooms ◽  
Sole Source ◽  
P Fractions ◽  
Citrus Orchard ◽  
Nutrient Runoff ◽  
Eutrophic Water ◽  
Orchard Soil ◽  
Particulate Form ◽  
Limiting Nutrient

Algal blooms in eutrophic water bodies are controlled by inputs of phosphorus (P) as the growth-limiting nutrient. Runoff particulate P associated with soil from fields often predominates among P fractions. Here, an algal bioassay to investigate the potential bioavailability of particulate P in soil collected from a citrus orchard was conducted. Microcystis aeruginosa was cultured in medium containing soil as the sole source of P. The P in the soil was not notably solubilized after autoclaving. Analyses of chlorophyll-a, suspended solids, particulate organic carbon, and particulate organic nitrogen showed that M. aeruginosa could utilize some of the P present in the soil, perhaps that in particulate form, but this form of P was not sufficient to maintain optimum growth.

EARLY WARNINGS FOR CATASTROPHIC SHIFTS IN ECOSYSTEMS: COMPARISON BETWEEN SPATIAL AND TEMPORAL INDICATORS

2010 ◽  
Vol 20 (02) ◽  
pp. 315-321 ◽  
Author(s):  
RAUL DONANGELO ◽  
HUGO FORT ◽  
VASILIS DAKOS ◽  
MARTEN SCHEFFER ◽  
EGBERT H. VAN NES
Keyword(s):  
Algal Blooms ◽  
Design Management ◽  
Leading Indicators ◽  
Lake Eutrophication ◽  
Warning Signals ◽  
Spatial Variance ◽  
Lake Model ◽  
Eutrophic Water ◽  
Catastrophic Shifts ◽  
Early Warnings

The task of providing leading indicators of catastrophic regime shifts in ecosystems is fundamental in order to design management protocols for those systems. Here we address the problem of lake eutrophication (that is, nutrient enrichment leading to algal blooms) using a simple spatial lake model. We discuss and compare different spatial and temporal early warning signals announcing the catastrophic transition of an oligotrophic lake to eutrophic conditions. In particular, we consider the spatial variance and its associated patchiness of eutrophic water regions. We found that spatial variance increases as the lake approaches the point of transition to a eutrophic state. We also analyze the spatial and temporal early warnings in terms of the amount of information required by each and their respective forewarning times. From the consideration of different remedial procedures that can be followed after these early signals we conclude that some of these indicators are not early enough to avert the undesired impending shift.

scholarly journals CyanoHABs: unavoidable evolutionary ecological consequence for low nutrient-requiring cyanobacteria in eutrophic water

2021 ◽  
Author(s):  
Wenduo Cheng ◽  
Somin Hwang ◽  
Qisen Guo ◽  
Haibei Zhang ◽  
Leyuan Qian ◽  
...  
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Nutrient Requirements ◽  
Key Factors ◽  
Narrow Angle ◽  
Eutrophic Water ◽  
Evolutionary Radiation ◽  
Cyanobacterial Harmful Algal Blooms ◽  
Multiple Species ◽  
Water Eutrophication

The mechanism of cyanobacterial harmful algal blooms (CyanoHABs) is complicated and confusing. One major reason is they are studied primarily from an ecological perspective and on bloom-forming species only. This narrow angle loses a broader evolutionary and ecological context in which CyanoHABs occur and fails to provide information on relevant components to achieve a wholistic understanding. To derive a comprehensive mechanism of CyanoHABs, we examine CyanoHABs through the overlooked evolutionary and ecological lenses: evolutionary radiation, ecological comparison with co-living algae, and recently identified genomic functional repertoire between blooming and non-blooming species. We found key factors: (1) elaborate diverse functional repertoire and low nutrient requirement in cyanobacteria molded by early adaptive evolution, (2) cyanobacteria having lower nutrient requirements than green algae indeed, (3) there is no directed evolution in biological functions toward water eutrophication in cyanobacteria, (4) the CyanoHAB-associated functional repertoire are more abundant and complete in blooming than non-blooming species. These factors lead us to postulate a preliminary mechanism of CyanoHABs as a synergistic quad: superior functional repertoire, established with long adaptive radiation under nutrient-deficient conditions and not evolved toward eutrophic conditions, enables cyanobacteria to efficiently utilize elevated nutrients under current eutrophic regime for excess growth and CyanoHABs thereof, due to their lower nutrient requirements than co-living algae. This preliminary synthesis without doubt needs further empirical testing, which can be undertaken with more comparative studies of multiple species using integrated systems biology approaches.

Modification of sediment - water solute exchange by sediment-capping materials: effects on O2 and pH

2008 ◽  
Vol 59 (12) ◽  
pp. 1101 ◽  
Author(s):  
K. Vopel ◽  
M. Gibbs ◽  
C. W. Hickey ◽  
J. Quinn
Keyword(s):  
Pore Water ◽  
Algal Blooms ◽  
Active Materials ◽  
Modified Zeolite ◽  
Capping Layer ◽  
Eutrophic Water ◽  
Solute Fluxes ◽  
Water Ph ◽  
Thick Layers ◽  
Different Doses

The release of phosphorus from sediments can stimulate algal blooms in eutrophic water bodies worldwide. One technique to reduce this release involves capping the sediment with millimetre-thick layers of chemically active materials such as aluminium hydroxide floc (alum), and the mineral-based products Phoslock and modified zeolite. The effects of this technique on transport and reaction of diagenetically important sediment compounds other than phosphorus are unknown. The present study used microelectrodes to measure the apparent gas diffusivity of capping layers derived from different doses of these capping materials and their effects on pore water pH and dissolved molecular oxygen. The apparent O2 diffusivity of alum capping layers (1.58 × 10–5 cm2 s–1) was constant with depth and higher than that of mineral-based capping layers (~1.15 × 10–5 cm2 s–1 and decreasing with depth in the capping layer). The capping materials raised the depth of the oxic–anoxic interface and associated pH minimum and altered the sediment O2 consumption as functions of the capping-layer thickness and apparent diffusivity. Modified zeolite layers decreased pore water pH slightly (0.3–0.5 units); alum layers decreased pH by 1–2.2 units. It is proposed that capping layers derived from doses >200 g m–2 can alter benthic process rates and solute fluxes.

Assessment of Absorbed Irradiation Dose Rate 137Cs by Emerged Plants in Oligotrophic and Eutrophic Water Bodies

2019 ◽  
Vol 55 (5) ◽  
pp. 100-106
Author(s):  
Ye. N. Volkova ◽  
V. V. Belyayev ◽  
S. P. Prishlyak ◽  
A. A. Parkhomenko
Keyword(s):  
Dose Rate ◽  
Irradiation Dose ◽  
Water Bodies ◽  
Eutrophic Water ◽  
Irradiation Dose Rate

National coastal management challenges and needs

Shore & Beach ◽  
2020 ◽  
pp. 34-43
Author(s):  
Nicole Elko ◽  
Tiffany Roberts Briggs
Keyword(s):  
Coastal Management ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Local Community ◽  
Extreme Event ◽  
Technical Information ◽  
Interdisciplinary Approach ◽  
Beach Erosion ◽  
The U.S

In partnership with the U.S. Geological Survey Coastal and Marine Hazards and Resources Program (USGS CMHRP) and the U.S. Coastal Research Program (USCRP), the American Shore and Beach Preservation Association (ASBPA) has identified coastal stakeholders’ top coastal management challenges. Informed by two annual surveys, a multiple-choice online poll was conducted in 2019 to evaluate stakeholders’ most pressing problems and needs, including those they felt most ill-equipped to deal with in their day-to-day duties and which tools they most need to address these challenges. The survey also explored where users find technical information and what is missing. From these results, USGS CMHRP, USCRP, ASBPA, and other partners aim to identify research needs that will inform appropriate investments in useful science, tools, and resources to address today’s most pressing coastal challenges. The 15-question survey yielded 134 complete responses with an 80% completion rate from coastal stakeholders such as local community representatives and their industry consultants, state and federal agency representatives, and academics. Respondents from the East, Gulf, West, and Great Lakes coasts, as well as Alaska and Hawaii, were represented. Overall, the prioritized coastal management challenges identified by the survey were: Deteriorating ecosystems leading to reduced (environmental, recreational, economic, storm buffer) functionality, Increasing storminess due to climate change (i.e. more frequent and intense impacts), Coastal flooding, both Sea level rise and associated flooding (e.g. nuisance flooding, king tides), and Combined effects of rainfall and surge on urban flooding (i.e. episodic, short-term), Chronic beach erosion (i.e. high/increasing long-term erosion rates), and Coastal water quality, including harmful algal blooms (e.g. red tide, sargassum). A careful, systematic, and interdisciplinary approach should direct efforts to identify specific research needed to tackle these challenges. A notable shift in priorities from erosion to water-related challenges was recorded from respondents with organizations initially formed for beachfront management. In addition, affiliation-specific and regional responses varied, such as Floridians concern more with harmful algal blooms than any other human and ecosystem health related challenge. The most common need for additional coastal management tools and strategies related to adaptive coastal management to maintain community resilience and continuous storm barriers (dunes, structures), as the top long-term and extreme event needs, respectively. In response to questions about missing information that agencies can provide, respondents frequently mentioned up-to-date data on coastal systems and solutions to challenges as more important than additional tools.

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