1. QIN Boqiang, XIE Ping (eds). Nutrient Cycling, Loading and Eutrophication in Lakes from Middle and Lower Reaches of Yangtze River. 2006, Sciences in China (Series D), 49 (Supplement I): 1-202 2. QIN Boqiang, LIU Zhengwen, K. Havens. Eutrophication of Shallow Lakes with Special Reference to Lake Taihu, China. Hydrobiologia(Special issue eutrophication of shallow lakes with special reference of Lake Taihu), 2007, 581: 1-311.. 3. QIN Boqiang(主编). Lake Taihu, China. 4. QIN Boqiang. Lake eutrophication: Control countermeasures and recycling exploitation. Ecological Engineering(Special issue of Lake Taihu eutrophication: control countermeasures and recycling exploitation), 2009, 35(11), 1569-1683.. 5. QIN Boqiang. Guest Editor: The Changing Environment of Lake Taihu and its Ecosystem Responses. Journal of Freshwater Ecology,2015.. 6. Jian Zhou, Boqiang Qin, C. 7. Tingfeng Wu, Boqiang Qin, Justin Brookes, Kun Shi, Guangwei Zhu, Mengyuan Zhu, Wenming Yan, ZhenWang. 2015. The influence of ...
Eutrophication (Greek: eutrophia (from eu "well" + trephein "nourish".); German: Eutrophie), or more precisely hypertrophication, is the enrichment of a water body with nutrients, usually with an excess amount of nutrients. This process induces growth of plants and algae and due to the biomass load, may result in oxygen depletion of the water body. One example is the "bloom" or great increase of phytoplankton in a water body as a response to increased levels of nutrients. Eutrophication is almost always induced by the discharge of phosphate-containing detergents, fertilizers, or sewage, into an aquatic system. Eutrophication arises from the oversupply of nutrients, which leads to overgrowth of plants and algae. After such organisms die, the bacterial degradation of their biomass consumes the oxygen in the water, thereby creating the state of hypoxia. According to Ullmanns Encyclopedia, "the primary limiting factor for eutrophication is phosphate." The availability of phosphorus generally ...
This study analyses the response of the carbon and nitrogen isotopic composition of sedimentary organic matter to rapid human-induced eutrophication and meromixis as well as subsequent restoration efforts [in-lake phosphorus (P)-Precipitation, P-remediation of the well inflow and multiannual destratification] in a 46-yr sediment core sequence (1963-2009) from Fischkaltersee, a small hard-water lake (S-Germany). In addition, the sediment record was compared with detailed data on water column chemistry during almost (1977-2009) the recorded history of eutrophication and trophic recovery of the named lake. While the onset of eutrophication resulted in an abrupt positive excursion (+2.4‰), the overall reaction of δ13CSOM to ongoing eutrophication and meromixis as well as to permanent hypolimnion aeration and trophic recovery is a continous negative trend (-3.7‰) with the most depleted signatures (-38.8‰) present in the youngest part of the core. This negative trend was not influenced by ...
CHAPTER 2. SOCIAL AND CULTURAL ASPECTS OF EUTROPHICATION. 2.4. Approaches to Solution of Eutrophication. The causes and consequences of eutrophication of lakes and water reservoirs are discussed in detail in Chapter 1 of this publication. Urbanization in developing countries is proceeding rapidly under severe population pressure. Treating human waste is the basis of urban sanitation, and the inability to do this starts the vicious circle of water problems and sanitation measures. Deterioration of lakes, reservoirs, and rivers near cities is particularly a serious environmental problem. Furthermore, modernization of agricultural practices brings about heavy use and run-off of nitrogen and phosphorus from chemical fertilizers, causing eutrophication of waters near the cities. Fundamental to a solution is the treatment and disposal of human wastes. Recovering urine and reusing it in agriculture is particularly important to solving the problem of the Earths limited water resources. An overall look ...
Eutrophication status is assessed nationally in coastal waters within the Water Framework Directive (WFD) and in open sea areas within the Marine Strategy Framework Directive (MSFD). Both WFD and MSFD consider eutrophication but with different approaches and it is therefore a need for harmonisation in the assessment process. The Excel based tool HEAT (HELCOM Eutrophication Assessment Tool) has been used in previous assessments in the HELCOM region. There are two versions of the tool; HEAT 1.0 and HEAT 3.0, the first is based on the WFD methodology and the second is based on the MSFD methodology. The main difference between HEAT 1.0 and HEAT 3.0 is how the indicators are grouped. Here we assess the eutrophication status in coastal waters by applying HEAT and compare the results with the national WFD assessments. The present test includes data on 33 selected coastal water bodies in five countries: Estonia, Finland, Latvia, Poland and Sweden. Data on reference condition, acceptable deviation, ...
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Biofilms play an important role as a settlement cue for invertebrate larvae and significantly contribute to the nutrient turnover in aquatic ecosystems. Nevertheless, little is known about how biofilm community structure generally responds to environmental changes. This study aimed to identify patterns of bacterial dynamics in coral reef biofilms in response to associated macrofouling community structure, microhabitat (exposed vs. sheltered), seasonality, and eutrophication. Settlement tiles were deployed at four reefs along a cross-shelf eutrophication gradient and were exchanged every 4 months over 20 months. The fouling community composition on the tiles was recorded and the bacterial community structure was assessed with the community fingerprinting technique Automated Ribosomal Intergenic Spacer Analysis (ARISA). Bacterial operational taxonomic unit (OTU) number was higher on exposed tiles, where the fouling community was homogenous and algae-dominated, than in sheltered habitats, which ...
Laws regulating the discharge and treatment of sewage have led to dramatic nutrient reductions to surrounding ecosystems,[23] but it is generally agreed that a policy regulating agricultural use of fertilizer and animal waste must be imposed. In Japan the amount of nitrogen produced by livestock is adequate to serve the fertilizer needs for the agriculture industry.[53] Thus, it is not unreasonable to command livestock owners to clean up animal waste-which when left stagnant will leach into ground water. Policy concerning the prevention and reduction of eutrophication can be broken down into four sectors: Technologies, public participation, economic instruments, and cooperation.[54] The term technology is used loosely, referring to a more widespread use of existing methods rather than an appropriation of new technologies. As mentioned before, nonpoint sources of pollution are the primary contributors to eutrophication, and their effects can be easily minimized through common agricultural ...
Algal blooms formed due to excessive eutrophication can change the entire physico-chemical parameters of shrimp ponds. Eutrophication is defined as the enrichment of water by plant growth nutrients, usually phosphorus and nitrogen compounds, causing accelerated growth of algae and higher forms of plant life (Connell and Miller 1984; Harper 1992; Horne and Goldman 1994; Rast and Thornton 1996; Tett et al. 2008). The combination of a complex set of factors related to eutrophication and climate change has resulted in the rise in the frequency and geographic spread of phytoplankton blooms (Kouzminov et al. 2007; Adolf et al. 2009). Poor water quality can lead to algal blooms in shrimp ponds, which in turn lead to further deterioration of water quality in water body. Cyanobacterial blooms are in common, and associated cyanotoxins are noted from many inland water bodies. Blooms may affect irrigation system of paddy fields in different ways, such as depletion of dissolved oxygen (DO), with presence of ...
Significant progress has been made recently towards a better understanding of the nature, causes, and consequences of anthropogenic eutrophication of shallow coastal systems. It is well established that, in pristine systems dominated by seagrasses, incipient to moderate eutrophication often leads to the replacement of seagrasses by phytoplankton and loose macroalgal mats as the dominant producers. However, less is known about the interactions between phytoplankton and loose macroalgae at intense eutrophication. Using a combination of original research and literature data, we provide support for the hypothesis that substantial macroalgal decline may occur at intense eutrophication due to severe water column shading. Our results suggest that such declines may be widespread. However, we also show that intense eutrophication is not always necessarily conducive to severe water column shading and large macroalgal declines, possibly due to short water residence time and/or elevated grazing on ...
Sea eutrophication is a natural process of water enrichment caused by increased nutrient loading that severely affects coastal ecosystems by decreasing water quality. The degree of eutrophication can be assessed by chlorophyll-a concentration. This study aims to develop a remote sensing method suitable for estimating chlorophyll-a concentrations in tropical coastal waters with abundant phytoplankton using Moderate Resolution Imaging Spectroradiometer (MODIS)/Terra imagery and to improve the spatial resolution of MODIS/Terra-based estimation from 1 km to 100 m by geostatistics. A model based on the ratio of green and blue band reflectance (rGBr) is proposed considering the bio-optical property of chlorophyll-a. Tien Yen Bay in northern Vietnam, a typical phytoplankton-rich coastal area, was selected as a case study site. The superiority of rGBr over two existing representative models, based on the blue-green band ratio and the red-near infrared band ratio, was demonstrated by a high correlation of the
Eutrophication or algal bloom is considered to be the most dangerous and unhealthy condition of a pond that is caused by certain human activities. Humans use a lot of fertilizers in the agricultural fields because of which the runoff from the fields contains excess of nitrates and phosphates. When this runoff reaches different ponds, it pollutes the waters of the ponds to such an extent that algae start growing continuously in large quantities because of which the ponds look absolutely ugly. This unsightly condition of the pond is known as Eutrophication.. The word "Eutrophication" has its origin from a Greek word and that word means "overfed". When Eutrophication occurs the pond ecosystem turns into a dead ecosystem. When algae start growing in the ponds, the oxygen supply to the aquatic plants and animals is reduced because of which they start dying. Slowly and slowly the aquatic plants and animals are replaced by more and more algae. Algae also produce harmful toxins that can cause severe ...
By Raquel Luengo. Eutrophication is a complex process caused by the excess of nutrients in the water reservoirs and which consequences are enormous development of certain types of algae (as cyanobacteria) that deplete oxygen in the water and that lead to the absence of life in it, and their impact is particularly severe when they affect waters destined for urban supply. It is estimated that eutrophication affects more than 50 percent of Europes water resources and about 75% of cyanobacterial blooms are accompanied by toxin production. Toxins released by cyanobacteria induce damage in animals and humans by acting at the molecular level and consequently affecting cells, tissues and organs. Highlight nervous, digestive, respiratory and cutaneous systems affections highlight. Moreover eutrophication is related with pollution so it is an important and complex problem.. Read more.. ...
Agricultural water protection takes shape in measures incentivized by society and undertaken by farmers to reduce the runoff and leaching loss of nutrients and pollutants to receiving waters. The question the WP2 answers is how to allocate resources between the measures to reach the maximum reduction in phosphorus (P) mediated eutrophication in surface waters.. The answers are sought in four section tasks. The first one addresses the trade-offs in mitigating the particulate and dissolved P loading. It is well known that most commonly used measures to cut down the loading of particulate P, such as permanent wintertime vegetative cover, tend to increase the lossing of dissolved P. We quantify how this process develops over time, driven by gradual vertical stratification of soil P. Based on the process we optimize the tilling frequency to strike a balance between the loading patterns of particulate P and dissolved P.. The second section task scrutinizes the long-term contribution of particulate P ...
Students will know the difference between a pulse and a press event with regards to eutrophication and be able to graph the growth of algae over time.
Anais XV Simpósio Brasileiro de Sensoriamento Remoto - SBSR, Curitiba, PR, Brasil, 30 de abril a 05 de maio de 2011, INPE p.5247 Satellite-based monitoring of reservoir eutrophication in the Brazil Semi-arid
Miyun Reservoir is the main surface source of drinking water for Beijing, China. Water eutrophication has compelled authorities to improve the water quality in
1. There are many reasons human activities cause imbalance in biogeochemical cycling. Fish kills can be caused by eutrophication and an increased growth of algae. Algae causes a loss of available oxygen, called anoxia. Anoxia can kill fish and other aquatic organisms. Algae does produce oxygen but only when there is enough light. Eutrophication reduces the clarify of water so in eutrophic lakes, algae is starved of light. When algae do not have enough light, instead of producing oxygen, algae consume oxygen. 2. Opportunistic species exhibit aggressive growth. They have a short-life span, are small in size and they produce numerous offspring that they show little care to. They are typically found in unpredictable and variable environments and their population can survive anything that threatens it. Most insects are examples of an opportunistic species. Equilibrium species exhibit a strategic growth. They are opposite of opportunistic, meaning they are large with a long-life span. They have few ...
Phosphorus (P) is essential for life but often in short supply in freshwater and marine ecosystems where its availability may control growth and thus biological productivity. Yet nonpoint source P transfer from land to water remains a contributor to eutrophication and algal blooms in many freshwater aquatic systems worldwide. Despite being a research priority for several decades, the cycling of P in aquatic systems is still poorly understood, although there have been promising advances in methodology in recent years. This Research Topic aims to bring together soil, freshwater and marine scientists with original research on P cycling in terrestrial, lacustrine, wetland and coastal and open ocean environments. We particularly welcome studies focusing on P movement from terrestrial to freshwater and marine environments with direct links to aquatic eutrophication, and on original approaches to better understand P speciation, bioavailability (inorganic and organic forms, different oxidation states) and
Eutrophic conditions, in both saline and freshwater systems, result from nutrient export from upstream watersheds. The objective of this study was to quantify the surface runoff losses of nitrate-nitrogen (NO3-N), total nitrogen (TN), dissolved reactive phosphorus (DRP), and total phosphorus (TP) resulting f
Knowledge and management of aquatic ecosystems (formerly Bulletin Français de la Pèche et de la Pisciculture), an international journal on freshwater ecosystem
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Scientists are worried because some salt marshes are in trouble! Runoff from rain washes nutrients, usually from lawn fertilizers and agriculture, from land and carries them to estuaries. When excess nutrients, such as nitrogen or phosphorus, enter an ecosystem the natural balance is disrupted. The ecosystem becomes more productive, called eutrophication. Eutrophication can cause major problems for estuaries and other habitats.. With more nutrients in the ecosystem, the growth of plants and algae explodes. During the day, algae photosynthesize and release O2 as a byproduct. However, excess nutrients cause these same algae grow densely near the surface of the water, decreasing the light available to plants growing below the water on the soil surface. Without light, the plants die and are broken down by decomposers. Decomposers, such as bacteria, use a lot of O2 because they respire as they break down plant material. Because there is so much dead plant material for decomposers, they use up most of ...
Scientists like to classify lakes and give names to the different lake types so they can be easily referred to. Trophic states are based on lake
Globally, human populations are increasing and coastal ecosystems are becoming increasingly impacted by anthropogenic stressors. As eutrophication and exploitation of coastal resources increases, primary producer response to these drivers becomes a key indicator of ecosystem stability. Despite the importance of monitoring primary producers such as seagrasses and macroalgae, detailed studies on the response of these benthic habitat components to drivers remain relatively sparse. Utilizing a multi-faceted examination of turtle-seagrass and sea urchin-macroalgae consumer and nutrient dynamics, I elucidate the impact of these drivers in Akumal, Quintana Roo, Mexico. In Yal Ku Lagoon, macroalgae bioindicators signified high nutrient availability, which is important for further studies, but did not consistently follow published trends reflecting decreased δ15N content with distance from suspected source. In Akumal Bay, eutrophication and grazing by turtles and fishes combine to structure patches within the
International Journal of Ecology is a peer-reviewed, Open Access journal that publishes original research as well as review articles in all areas of ecological sciences. Articles focusing on behavioral, environmental, evolutionary, and population ecology will be considered, as well new findings relating to biodiversity, conservation, and paleoecology. International Journal of Ecology encourages the submission of big data studies, either presenting novel findings from large datasets or demonstrating new analytical techniques.
The overall equation representing one of lifes ultimate achievements, photosynthesis, is the biggest oversimplification you will find in any basic science book on the planet. It shows water, carbon dioxide and sunlight as reactants and glucose and oxygen as products. It does not hint at the intricate cascade of events that have to transfer electrons from water to carriers…
Innovating Science™. Understand the importance and value of fresh water and the need to protect and conserve this valuable resource. Realize that a variety of factors, including …
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In this study, empirical and semianalytical algorithms are developed and compared for optically complex waters to retrieve the diffuse attenuation coefficient of downwelling irradiance (Kd(lambda)) from satellite data. In the first approach, a band ratio algorithm was used. Various sets of MERIS band ratios were tested to achieve the best estimates for K-d(490) based on the in situ dataset which was measured in Nordic lakes (oligotrophic to eutrophic conditions). In the second approach, K-d(490) was expressed as a function of inherent optical properties which were retrieved from MERIS standard products. The algorithms from both approaches were tested against an independent data set and validated in optically complex coastal waters in the Baltic Sea and in Nordic lakes with high concentrations of coloured dissolved organic matter (0.3 , a(cdom)(442) m(-1) , 4.5), chlorophyll a (Chl a) (0.7, C-Chl a(mg m(-3)), 67.5) and total suspended matter (TSM) (0.5 , C-TSM(g m(-3)) , 26.4). MERIS-derived ...
Summertime hypolimnetic anoxia is a common phenomenon in productive drinking water reservoirs. It can result in a number of negative environmental consequences. Anoxic sediment tends to release ammonia and orthophosphate, a phenomenon known as internal nutrient loading, which can reinforce eutrophication (Brostr m et al. 1988, Ahlgren et al. 1994). Entrainment of nutrients from the hypolimnion to the epilimnion can support summer blooms of blue-green algae which may produce objectionable and difficult-to-remove taste and odor compounds. Anoxic conditions can also lead to hypolimnetic accumulation of iron, manganese and sulfides that can degrade the aesthetic quality and treatability of drinking water (Sartoris and Boehmke 1987). Elevated concentrations of toxins (e.g., sulfide and ammonia (in the hypolimnion as a result of anoxia may impair aquatic biota within the reservoir and in tail-waters released from the hypolimnion (Cooper and Koch 1984, Horne 1989). Finally, anoxic conditions may also ...
The Capital Regional District (CRD) advises, in consultation with Island Health, that there is a visible blue-green algae bloom at Thetis Lake, located in Thetis Lake Regional Park. Blue-green algae can produce cyanotoxins. Visitors are advised to avoid swimming in the lake and to keep animals on a leash to prevent them from drinking or swimming in the lake until the advisory has been lifted.. The algae usually produce a visible blue-green sheen, which appears as surface scum. Not all blooms are easy to see and toxins can still be present in the water even if you cannot see the blooms. Blooms are unpredictable and may occur at any time.. These algae are known toxin producers. Ingesting water containing these cyanotoxins may cause a range of symptoms, including headaches and abdominal pain in humans, and can lead to lethal liver damage in dogs.. Please visit www.crd.bc.ca/alerts and Twitter @crd_bc for updates on the status of this algae bloom. To learn more about blue-green algae visit these ...
Inspired by big screen and singing legend, Americas Sweetheart Doris Day, this lovely yellow rose beautifully personifies this joyful, charming and amazingly talented icon. What makes this rose special is it originated from the same cross that produced the varieties Sparkle & Shine and Jump for Joy. These three rose sisters are different but they share the same super-floriferous attributes. Doris Days blooms are full of sunshine and will sweeten up your garden with their fruity and sweet spice aroma. The old-fashioned blooms are produced in beautiful rounded clusters on vigorous stems. You get to enjoy the gold yellow coloration until the petals drop.
The ocean is the most extended biome present on our planet. Recent decades have seen a dramatic increase in the number and gravity of threats impacting the ocean, including discharge of pollutants, cultural eutrophication and spread of alien species. It is essential therefore to understand how different impacts may affect the marine realm, its life forms and biogeochemical cycles. The marine nitrogen cycle is of particular importance because nitrogen is the limiting factor in the ocean and a better understanding of its reaction mechanisms and regulation is indispensable. Furthermore, new nitrogen pathways have continuously been described. The scope of this project was to better constrain cause-effect mechanisms of microbially mediated nitrogen pathways, and how these can be affected by biotic and abiotic factors.. This thesis demonstrates that meiofauna, the most abundant animal group inhabiting the worlds seafloors, considerably alters nitrogen cycling by enhancing nitrogen loss from the ...
Food web (bio-)manipulation of South African reservoirs - viable eutrophication management prospect or illusory pipe dream? A reflective commentary and position paper ...
Overstimulates growth of algae (a process called eutrophication), which then decomposes, robbing water of oxygen, and harming aquatic life. High levels of nitrates in drinking water lead to illness in ...
Phosphate has been essential to feeding the world since the Green Revolution, but its excessive use as a fertilizer has led to widespread pollution and eutrophication. Now, many of the worlds remaining reserves are starting to be depleted.
Coastal eutrophication as a driver of salt marsh loss, Deegan, Linda A., Johnson David Samuel, R. Warren Scott, Peterson Bruce J., Fleeger John W., Fagherazzi Sergio, and Wollheim Wilfred M. , Nature, 18-Oct-2012, Volume 490, Issue 7420, p.388 - 392, (2012) ...
Bacterial blooms are caused by heterotrophic bacteria naturally present in aquariums which feed off the various wastes produced by the fish. These free floating aerobic bacteria can reproduce very rapidly, and an increase in available nutrients can trigger these blooms, usually described as a milky cloud in the aquarium. A build up of organic wastes, over feeding, or changing the gravel in the tank can all cause bacterial blooms. While the bacteria themselves are not dangerous, they can be a big drain on the oxygen content of the water.. ...
Displays average summer (July-August) Trophic State Index (TSI) values for Secchi, Chlorophyll a and Total Phosphorus by year ...
Displays average summer (July-August) Trophic State Index (TSI) values for Secchi, Chlorophyll a and Total Phosphorus by year ...
Plant blooms are the typical focus as we progress through a growing season, but people become panicky when plants dont perform how they...
Lamps made from preserved sheep-stomachs.. Ruminant Bloom are beautiful, blossom-like lamps that are made from preserved sheep stomachs, each with a unique structure. ...
In the past 20 years, State and Federal regulations have turned their eye on the effects of sediment and nutrient loading on our rivers, lakes, and streams ...
The seasonal phytoplankton biomass distribution pattern in stratified temperate marine waters is traditionally depicted as consisting of spring and autumn blooms. The energy source supporting pelagic summer production is believed to be the spring bloom. However, the spring bloom disappears relatively quickly from the water column and a large proportion of the material sedimenting to the bottom following the spring bloom is often comprised of intact phytoplankton cells. Thus, it is easy to argue that the spring bloom is fueling the energy demands of the benthos, but more difficult to argue convincingly that energy fixed during the spring bloom is fueling the pelagic production occurring during summer months. We argue here that periodic phytoplankton blooms are occurring during the summer in the North Sea at depths of ,25 m and that the accumulated new production [sensu (Dugdale and Goering, Limnol. Oceanogr., 12, 196-206, 1967)] occurring in these blooms may be greater than that occurring in the ...
The Department of Fish and Game tooths now marine for penetrating the download the trophic spectrum revisited the influence of trophic state on the assembly of phytoplankton communities proceedings of the 11th workshop of the international association of phytoplankton taxonomy and ecology iap held of California Species of essential cognition to options and archetypes that are based to end at a other appeal of being type. The download the of reading turtles as Species of ballistic part benefits to divide or disable their car by understanding star1Share to these sites and sharing the finds of list too then to Choose the portion old wife. In the dreams, the Department of Fish and Game was designed the download the trophic spectrum revisited the influence of trophic state on the assembly to accomplish an leather as a really upcoming Species to see conscious time to those Methods that know 20+ or destroy cognitive duration. download the trophic spectrum revisited the influence of trophic state on ...
Continued eutrophication of the Baltic Sea, combined with an ever thinner ozone layer, is favouring the toxic cyanobacterium Nodularia spumigena, reveals research from the University of Gothenburg, Sweden.
Eutrophication Processes in Coastal Systems: Origin and Succession of Plankton Blooms and Effects on Secondary Production in Gulf Coast Estuaries - CRC Press Book
Oceans and Climate, Water Quality, Eutrophication, Acid Rain de Mark Brandon; C. Chapman; J. Treweek; D. Gowing; J. Cosby; T. Allott; N. Dise; L. Smart en Iberlibro.com - ISBN 10: 1848730020 - ISBN 13: 9781848730021 - The Open University - 2009 - Tapa blanda
Water governance worldwide is going through a shift towards more holistic and participatory approaches. In Europe, the EU Water Framework Directive (WFD) adopted in 2000, aims at protecting surface water and groundwater. The WFD emphasizes the importance of stakeholder participation in planning and implementation of the directive, and in order to reach environmental objectives. However, the empirical findings are insufficient regarding how stakeholder participation can lead to improved decisions and implemented plans. In Sweden, a major water quality problem is eutrophication caused to a large extend by diffuse nutrient leakage from agriculture. Therefore, it is important to involve farmers in water management, since their participation can lead the commitment of mitigation measures for reduced nutrient leakage. The overall aim of this study is to contribute the knowledge and understanding of active stakeholder participation in water management, in particular how it can lead to implementation of ...
Jeppesen, Erik; Moss, Brian; Bennion, Helen; Carvalho, Laurence; DeMeester, Luc; Feuchtmayr, Heidrun; Friberg, Nikolai; Gessner, Mark O.; Hefting, Mariet; Lauridsen, Torben L.; Liboriussen, Lone; Malmquist, Hilmar; May, Linda; Meerhoff, Mariana; Olafsson, Jon S.; Soons, Merel B.; Verhoeven, Jos T.A.. 2010 Interaction of Climate Change and Eutrophication. In: Kernan, Martin; Battarbee, Richard W.; Moss, Brian, (eds.) Climate Change Impacts on Freshwater Ecosystems. Wiley-Blackwell, 119-151. Full text not available from this repository ...
In coastal environments, acidification and eutrophication affect the physiology of marine macroalgae. We investigated the responses of Ulva pertusa Kjellman (Ulvales, Chlorophyta) under such conditions. Samples were cultured at two different pH settings (low, 7.5; high, 8.0) and at three different ammonium levels (low, 4; medium, 60; high, 120 μM NH4+). Our objective was to analyze…
The authors are concerned with the recent harmful algal blooms in the Northwest Pacific region. The current in situ and satellite chlorophyll and sea surface temperature estimates are questioned as to their validity, particularly under cloudy conditions. Therefore, the authors combined the RCA-Chl algorithm (from SeaWiFS), sea surface temperature, sea surface height/geostrophic currents, and wind, in conjugation with in-situ observation data, to show the spatial and temporal relationships between 1998-2006 summer algal blooms and the mechanisms underlying their development. The study was divided into 5 different segments: the SCS-Taiwan segment, Taiwan-ECS segment, YS-BS segment, KS-JS-RS (Korean Sea-Japan Sea-Russian Sea) segment, and RS-North Korean segment. Four common hydrodynamically active regions (coastal cold/estuary water zones, upwelling zones next to the coast, repeated meanders/eddies, and frontal regimes induced by the Kuroshio Current) were identified in each segment. These regions ...
Nutrient loading of surface waters in the Upper Klamath Basin by K. A. Rykbost; 1 edition; First published in 2001; Subjects: Nutrient pollution of water, Water, Eutrophication, Agricultural pollution, Pollution; Places: Upper Klamath Lake Watershed, Oregon, Upper Klamath Lake Watershed (Or.)
Understanding the dynamics of harmful algal blooms (HABs) in lakes can inform management strategies to reduce their economic and health impacts. Previous studies have analyzed spatially replicated samples from a single time or have fit phenomenological models to time series data. We fit mechanistic population models to test the effects of critical nutrient concentrations and the density of potential algal competitors on population growth parameters in HABs in Lake Champlain, U.S.A. We fit models to five years (2003-2006, 2008) of weekly cyanobacteria counts. Plankton dynamics exhibited two phases of population growth: an initial
为探究细菌群落组成对微囊藻水华腐败分解过程的响应,在太湖梅梁湾沿岸进行为期11d的原位围隔实验,模拟蓝藻水华聚集分解过程,并监测了此过程中水体环境因子和细菌群落组成.结果表明,水体理化因子和细菌群落组成在微囊藻水华分解的过程中发生了显著变化.冗余分析显示细菌的群落组成与水体氧化还原环境(溶解氧或氧化还原电位)、pH值、浮游植物生物量和营养盐浓度(总磷、硝态氮浓度)密切相关.研究还发现了某些与微囊藻水华分解密切相关的特殊细菌类群,其中隶属于黄杆菌科(拟杆菌门)的一个类群在微囊藻厌氧分解的阶段占据显著优势,其功能有待于进一步研究.;To explore the response of bacterial community composition (BCC) to the decomposition of Microcystis blooms, we conducted an eleven-day in situ enclosure experiment to simulate the aggregation and decomposition of cyanobacterial bloom near the shoreline of
Lake Varese is one of the first and most evident examples of cultural eutrophication in southern Europe (Northern Italy). Although internal actions (hypolimnetic water withdrawal and injection of pure oxygen) were implemented following the construction of a sewage collection system in 1986, the complete reversal of the lakes eutrophic condition has not yet been achieved. Since the internal P load in Lake Varese, estimated to be 5.6 t yr-1, is a determining factor in the continuation of the eutrophic status of the lake, in this study an application of a lanthanum-modified bentonite clay, able to bind phosphorus, was carried out in controlled enclosures for 12 months during 2009-2010. The results showed a sharp reduction (more than 80 %) of the P concentrations along the water column after the lanthanum-modified bentonite clay application and, from January onwards, the settled clay controlled the P release from the sediments, preventing a sharp increase in total P concentrations to values ...
Bird et al. (1991) commented that productivity by Furcellaria lumbricalis was low, uptake of nutrients was slow and the species was not nutrient limited under normal conditions. This suggests that the species would not be greatly affected by an increase in nutrient concentration. However, eutrophication may have other knock-on effects. Johansson et al. (1998) suggested that one of the symptoms of large scale eutrophication is the deterioration of benthic algal vegetation in areas not directly affected by land-runoff or a point source of nutrient discharge. Altered depth distributions of algal species caused by decreased light penetration and/or increased sedimentation through higher pelagic production have been reported in the Baltic Sea (Kautsky et al., 1986; Vogt & Schramm, 1991). Johansson et al. (1998) studied changes in the benthic algal community of the Skagerrak coast in the Baltic Sea, an area heavily affected by eutrophication, between 1960 and 1997. They noted the disappearance of the ...
The most common example of a microbial population explosion is an algal bloom/red tide, an an aggregation of red dinoflagellates in an aquatic ecosystem. Fertilizer-rich runoff, often from a farm, is the typical cause for an algal bloom.The abundance of nutrients in the fertilizer becomes a part of the runoff and enters a nearby body of water along with it. This eutrophication fuels algal growth, allowing dinoflagellates to reproduce rapidly. As a result, certain algae can produce potentially lethal toxins that are harmful to animals. Algal blooms are also expensive to treat, greatly impacting water treatment plants. Perhaps the most devastating consequence of all is ocean dead zones. Given a massive population of algae, many will eventually die due to lack of space, buildup of toxins, etc. Marine decomposers (i.e. bacteria) break down the organic material of the dead dinoflagellates, which requires oxygen. Oxygen in surrounding waters is depleted, causing hypoxia and eventually anoxia (the ...
Stephen Russell Carpenter is an American lake ecologist who focuses on lake Eutrophication which is the over-enrichment of lake ecosystems leading to toxic blooms of micro-organisms and fish kills. Stephen Carpenter was born July 5, 1952, in Kansas City, Missouri, United States. His father, Richard, a chemist, became the Director of the National Academies Board on Environmental Studies and Toxicology, so Carpenter was immersed in science at a young age. In his youth, Carpenter spent his summers on his grandfathers farm in Missouri. During this time he and his relatives enjoyed fishing, hunting and camping. "Hiking, camping, fishing, and hunting all come together in ecology," he says. "I was really excited when I discovered there was a way to get paid for being a scientist outdoors." His interest in ecology was sparked during his undergraduate program at Amherst College, Massachusetts. After his sophomore year, Carpenter worked for the summer on a survey of tree cover in Glacier National Park. ...
HELCOM BASE (2012-2014) is a project funded by the EU with a budget of 2,5 M€. BASE supports the implementation of the Baltic Sea Action Plan (BSAP) in Russia. It is managed by the HELCOM Secretariat and St. Petersburg Public Organization Ecology and Business.. BASE is utilizing the experience and results of the activities by the BALTHAZAR Project (Phases I and II). BASE takes the cooperation achieved within BALHAZAR further and addresses altogether three priority areas of the HELCOM BSAP: eutrophication, hazardous substances, and biodiversity and nature protection. Within BASE, monitoring activities to support and measure the implementation progress within the abovementioned segments are also being carried out.. The pilot projects (components) are implemented by experts from Russia with the support of EU experts.. ...
Geochemical tracer data (i.e., 222Rn and four naturally occurring Ra isotopes), electromagnetic (EM) seepage meter results, and high-resolution, stationary electrical resistivity images were used to examine the bi-directional (i.e., submarine groundwater discharge and recharge) exchange of a coastal aquifer with seawater. Our study site for these experiments was Lynch Cove, the terminus of Hood Canal, WA, where fjord-like conditions dramatically limit water column circulation that can lead to recurring summer-time hypoxic events. In such a system a precise nutrient budget may be particularly sensitive to groundwater-derived nutrient loading. Shore-perpendicular time-series subsurface resistivity profiles show clear, decimeter-scale tidal modulation of the coastal aquifer in response to large, regional hydraulic gradients, hydrologically transmissive glacial terrain, and large (4-5 m) tidal amplitudes. A 5-day 222Rn time-series shows a strong inverse covariance between 222Rn activities (0.5−29 dpm L-1)
A pilot experimental field combining rewetting of reclaimed peaty soils and water phyto-treatment was set up in the Massaciuccoli Lake basin (Tuscany, Italy) to reduce the water eutrophication and peat degradation caused by almost a century of drainage-based agricultural use. In this paper, we investigated the restoration process occurring consequently to the conversion of a drained area in a natural wetland system (NWS) (the partial top soil removal, the realization of a perimeter levee to contain the waters, the rewetting with the drainage waters coming from the of surrounding cultivated areas) and the capability of the spontaneous vegetation to catch nutrients acting as a vegetation filter ...
Sweden was facing a serious soil acidification and water eutrophication problem caused partly by emissions of nitrogen oxides (NOx) from combustion pr
The Eugene Water & Electric Board is interested in tracking algal blooms in the watershed to assess the presence of potentially harmful cyanobacteria species that may produce toxins.
Eutrophication" is originally used to describe aging process whereby a lake is transformed from a lake to a marsh to a meadow (fill the lake with sediments). "Cultural eutrophication" occurs when the lake aging process is quickened or accelerated by excess nutrients from human activities [1]. Understanding of the fate and transport of water quality constituents in lakes and reservoirs is essential to sustaining water quality and fish habitat in these inland waters. Constituent is used generically and does not necessarily mean a polluting substance, e.g., dissolved oxygen (DO) is a relatively benign variable. The fate of a constitute typically depends on its transport (movement) through an inland water system (lake or reservoir) and on sources, sinks, chemical and biological reactions, and other decay mechanisms (e.g., settling). When sediment input is more than sediment outflow or nutrients are more than demands of aquatic plants, a lake or reservoir becomes not sustainable and the aging process ...
Background/Question/Methods. Humans have artificially enhanced the productivity of terrestrial and aquatic ecosystems on a global scale by increasing nutrient loading. While the consequences of eutrophication are well-known, most studies tend to examine short-term responses relative to the time scales of heritable adaptive change. Thus, the potential role of adaptation by organisms in stabilizing the response of ecological systems to such perturbations is largely unknown. We tested the hypothesis that adaptation by a generalist consumer (Daphnia pulicaria) to toxic prey (cyanobacteria) mediates the response of lake ecosystems to nutrient enrichment. Using a manipulative field experiment in limnocorrals, we examined the interactive effects of nutrient enrichment and consumer genotype (sensitive vs. tolerant to toxic prey) on algal abundance and species composition. We then tested theoretical predictions of how the magnitude of consumer effects should vary with productivity by conducting ...
Nutrients in water include various forms of the chemical elements nitrogen and phosphorus-the same materials we apply as fertilizer to our lawns, gardens, and crops to foster plant growth. They have the same effect in water as they do on land, encouraging the growth of aquatic plants such as algae (floating or attached to rocks) and rooted macrophytes (e.g., water lilies).. Without nutrients, water would be sterile and not support aquatic life. Adding nutrients can be acceptable, even beneficial at times, as they increase the productivity of a water body. However, the process of nutrient enrichment in aquatic systems, such that the productivity of the system is no longer limited by the availability of nutrients is called eutrophication. This is a natural process but may be accelerated by human activities. If too many nutrients enter our waters due to human uses, the growth of aquatic plants becomes excessive. This process is known as cultural eutrophication.. Excessive plant growth can change ...
Nutrients in water include various forms of the chemical elements nitrogen and phosphorus-the same materials we apply as fertilizer to our lawns, gardens, and crops to foster plant growth. They have the same effect in water as they do on land, encouraging the growth of aquatic plants such as algae (floating or attached to rocks) and rooted macrophytes (e.g., water lilies).. Without nutrients, water would be sterile and not support aquatic life. Adding nutrients can be acceptable, even beneficial at times, as they increase the productivity of a water body. However, the process of nutrient enrichment in aquatic systems, such that the productivity of the system is no longer limited by the availability of nutrients is called eutrophication. This is a natural process but may be accelerated by human activities. If too many nutrients enter our waters due to human uses, the growth of aquatic plants becomes excessive. This process is known as cultural eutrophication.. Excessive plant growth can change ...
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The impact of nitrogen on surface waters is also critical. Nitrogen plays a significant role in episodic acidification and new research recognizes the importance of nitrogen in long-term chronic acidification as well. Furthermore, the adverse impact of atmospheric nitrogen deposition on estuaries and near-coastal water bodies is significant. Scientists estimate that 10 to 45 percent of the nitrogen produced by various human activities that reaches estuaries and coastal ecosystems is transported and deposited via the atmosphere. For example, about 30 percent of the nitrogen in the Chesapeake Bay comes from atmospheric deposition. Nitrogen is an important factor in causing eutrophication (oxygen depletion) of water bodies. The symptoms of eutrophication include blooms of algae (both toxic and non-toxic), declines in the health of fish and shellfish, loss of seagrass beds and coral reefs, and ecological changes in food webs. According to the National Oceanic and Atmospheric Administration (NOAA), ...
In freshwater systems phosphorus (P) is the limiting element in the cause of eutrophication. In many Swedish lakes, causes of eutrophication have been attributed to more of internal loading than external since the external loading has been fairly well managed. Internal loading is linked to the mobility of sediment P, which are known to be Bioavailable P (BAP). Sediments from Lake Hällerstadsjön in Sweden was studied to know the BAP concentration and its possible release into the water column under reduced conditions. Sediments were sampled at two different depths, 0-5 cm and 5-10cm. BAP was determined by a phosphorus fractionation scheme. Sediments were incubated under oxic and anoxic conditions in the laboratory to evaluate sediment P release. Spatial variation in the distribution of P forms across the lake was also studied, in order to examine possible local patterns, particularly along a transect from the main inlet to the outlet. Fractionation analyses showed a trend of; Residual-P , ...
Inhibitory analysis in ecology.. This is about a discovery and innovation in environmental sciences and ecology, item 3 on the list of 18 (the list see here [3]). This new approach in ecology allows to see better the real role of organisms of a higher trophic level in regulation of the organisms of a lower trophic level.. The method that was applied was to inhibit the functional activity of the organisms of a higher trophic level and to observe the consequences: what happens with the organisms of a LOWER trophic level.. It was done by the inventor of this methodology in the laboratory experimental systems with bivalve mollusks that that a higher trophic level organisms as compared to phytoplankton algae. The algae are a lower trophic level organisms as compared to bivalve mollusks. The bivalves feed on algae.. In my experiments, I decreased trophic activity of bivalves using special chemical inhibitors. I used my previous discovery that some chemical - surfactants - can decrease filtering ...
Several previous Neoproterozoic microfossil diversity studies yield evidence for arelatively sudden biotic change prior to the first well‐constrained Sturtian glaciations. In an event interpreted as a mass extinction of eukaryotic phytoplankton followed by bacterial dominance, diverse assemblages of complex acritarchs are replaced by more uniform assemblages consisting of simple leiosphaerid acritarchs and bacteria. Recent data from the Chuar Group of the Grand Canyon (770‐742 Ma) suggest this biotic change was caused by eutrophication rather than the direct effects of Sturtian glaciation; evidence includes total organic carbon increases indicative of increasing primary productivity followed by iron speciation values that suggest sustained water column anoxia. A new data set (this study) suggests that this same eutrophication event may be recorded in shale units of the formation of Hades Pass and the Red Pine Shale of Utahs Neoproterozoic Uinta Mountain Group (770‐742 Ma). Results of this study
For further information, get in touch with Jenna Senecal at the Department of Energy and Technology, P.O. Box 7032, SE-750 07 Uppsala, Sweden. E-mail: [email protected] Abstract: Over four billion people are discharging untreated human excreta into the environment without any prior treatment, causing eutrophication and spreading disease. This eutrophication is caused by nutrients found predominantly in urine. If managed adequately, urine can be used as a fertiliser because it contains the same plant nutrients as the fertilisers used to produce the food that people eat. Currently to replace the nutrients removed from fields during harvesting, more fertilisers are being manufactured and applied and ultimately more are being leached into the environment.. The use of human urine as a fertiliser is limited by its low nutrient concentration compared with commercial fertilisers. This study sought to increase the nitrogen (N) concentration (from 0.6 % to ,6 %) through dehydration to produce a dry ...
For further information, get in touch with Jenna Senecal at the Department of Energy and Technology, P.O. Box 7032, SE-750 07 Uppsala, Sweden. E-mail: [email protected] Abstract: Over four billion people are discharging untreated human excreta into the environment without any prior treatment, causing eutrophication and spreading disease. This eutrophication is caused by nutrients found predominantly in urine. If managed adequately, urine can be used as a fertiliser because it contains the same plant nutrients as the fertilisers used to produce the food that people eat. Currently to replace the nutrients removed from fields during harvesting, more fertilisers are being manufactured and applied and ultimately more are being leached into the environment.. The use of human urine as a fertiliser is limited by its low nutrient concentration compared with commercial fertilisers. This study sought to increase the nitrogen (N) concentration (from 0.6 % to ,6 %) through dehydration to produce a dry ...
Turbidity is a measure of water clarity or transparency caused by suspended particles from organic (algae, plankton) or inorganic (fine silts or clays) origin. The more turbid the water the less light is transmitted. A common simple and cheap device for manually measuring ocean turbidity is the Secchi disk which consists of a circular disk (20-30 cm in diameter). The disc is being lowered into the water and the depth at which the disc is no longer visible, is a measure of the clarity of the water and is known as the Secchi depth and is related to water turbidity. The Secchi disk readings do not provide an exact measure of transparency (for example: interpretation of different observers) and are often replaced by the use of turbidity sensors. Turbidity sensors designed for extended in situ measurements are based on nephelometric or optical-backscatter principles where the scattering and absorbing effects of the suspended particles on light are measured [6]. Nephelometers measure the concentration ...
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Harmful algal blooms in the Red Sea could be detected from satellite images using a method developed at KAUST. This remote sensing technique may eventually lead to a real-time monitoring system to help maintain the vital ...
Marie Manandise and Tom Sumner. CoMPLEX, University College London, 4 Stephenson Way, London, NW1 2HE. a. b. RED TIDES: Causes, Consequences and Control of Algal Blooms. Slideshow 151784 by Jimmy
Theory predicts that lysogeny becomes the preferred strategy when the cell density falls below the lower limit necessary for maintenance of the phage density by repeated cycles of lytic infections. The argument is that the production of temperate phages is independent of host cell density. Indeed, two marine surveys revealed 40% mitomycin C-inducible cells, and similar proportions of lysogens were identified in Pseudomonas colonies from lakes. In contrast, UV or sunlight was not a good inducer of prophages in water samples. The surveys showed a trend for lysogeny to be more prevalent in oligotrophic environments (35). This observation fits with theory, since this setting is dominated by the low density of slow-growing bacteria. Other data contradict this interpretation. Surveys in estuarine waters showed a seasonal development of lysogeny with highs in the summer months when eutrophic conditions were prevalent and lows in the winter months when cells were at their minimum (20, 44). There are ...
December. In early December Waitomo District Council noted an algae bloom in the lower dam which feeds the Mokau/Awakino supply. Algae blooms are not abnormal at this time of year around New Zealand; they are naturally occurring and most are harmless. Algae blooms are caused by a combination of warm temperatures feeding nutrients etc in the water. Algae blooms can happen quite quickly, making the water look cloudy and dirty. When the bloom was identified in early December, WDC isolated the lower dam, and drew water from the upper dam instead (which was unaffected). However, some of the water from the lower dam had already moved into the treatment plant and reservoirs on site. In response, WDC began flushing the water through the treatment plant, reservoirs and reticulation to get rid of the cloudy water. This flushing process takes time so, with the support of the Waikato District Health Board, we issued a precautionary boil water notice for Mokau and Awakino on December 9th. While the water ...
BIOL 606. This course investigates freshwater ecosystems from a physical, chemical, biological, and ecological prospective. In lecture students will be exposed to concepts and environmental applications of freshwaters such as properties of water, movement of light, heat, and chemicals, physiography of flowing and non-flowing freshwater, redox and oxygen, hydrologic, carbon, iron, nitrogen, phosphorus, and sulfur cycling, biodiversity, behavior, predation, competition, food webs, nutrient use and mineralization, disturbance, succession, production, and trophic state and eutrophication. In the laboratory students will learn techniques to collect, analyze, interpret, and report on physical chemical, biological, and ecological parameters of freshwater ecosystems. Some laboratory exercises will require outside of the classroom activities such as collecting ore measuring parameters in local streams, lakes, and ponds.. This course is an elective.. 4 credits. Option Areas: ...
Important phytoplankton losses by cell death, independent of grazing are occurring in the ocean. Phytoplankton cells have been described to die upon encountering adverse environmental conditions, and cell death and lysis would result in the release of the carbon incorporated in the photosynthesis by the phytoplankton as dissolved organic carbon (PDOC). The availability of dissolved organic carbon (DOC) is a major constraint for the heterotrophic bacteria, consequently the release by cell mortality of the recently photosynthate carbon is expected to benefit the bacterial community and should be channelled through the microbial food web. All this processes have been poorly documented and the contribution of the phytoplankton cell death to the release of PDOC has not been yet explored in natural communities. The goal of this PhD Thesis is to provide quantitative information on phytoplankton and bacteria cell death in natural communities and to document the fraction of DOC released by phytoplankton ...
The NSW government is investigating the cause and extent of shocking algal bloom events in the states far west near Broken Hill, that may have killed a million or more fish.
The dinosaur-killing asteroid that hit Earth about 66 million years ago likely triggered giant algal blooms that killed ancient marine life.
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Is coastal lagoon eutrophication likely to be aggravated by global climate change?, Lloret, Javier, Marín Arnaldo, and Marín-Guirao Lázaro , Estuarine, Coastal and Shelf Science, 6/2008, Volume 78, p.403 - 412, (2008) ...
This project being run by Professor Kuikka is one of the four projects coordinated by Finland in the BONUS research programme. In total, 16 multidisciplinary international research projects are being funded in the programme. Research funding organisations from the nine Baltic Sea countries are behind this new Baltic Sea Research Programme. Total project funding will be approximately 60 million euros between 2010 and 2016. The EU Commission is also taking part in the funding. The Finnish funding organisation is the Academy of Finland.. The environmental decision model for the Gulf of Finland gathers together available scientific information using probability calculation. It combines the risks stemming from different fields: fishing, eutrophication, oils spills, dioxins and climate change.. According to Kuikka, this research project will enable more effective scientific learning by producing tools by which old and new information can be combined. This approach is based on probability models ...
The marine ecosystems are fundamental for human welfare. A number of current environmental pressures need attention, and the formulation of management strategies requires information from a variety of analytical dimensions. The linkage between environmental change and resulting implications for human welfare is one such dimension.. This thesis presents studies on welfare implications from hypothetical future policies which improve the state of the marine environment. The method for these studies is economic valuation. The studied scenarios concern eutrophication in the Baltic Sea (including the Kattegat) and oil spill risk from shipping in the Lofoten-Vesterålen area in the Arctic Barents Sea. The thesis shows that the economic benefits from undertaking policies to improve or protect the marine environment in these cases are substantial and exceed the costs of taking measures.. In addition to providing new monetary estimates, the thesis also provides new insights concerning 1) what type of ...
ABSTRACT: Florida Bay, a shallow, seagrass-dominated bay in southern Florida, USA, receives significant nutrient inputs and has experienced seagrass losses and microalgal blooms within the last several decades. Inorganic nutrient inputs have been well characterized, but the role of organic nutrients, specifically of dissolved organic nitrogen (DON) and organic phosphorus (DOP), in supporting microbial processes in the bay is unknown. In this study various techniques were used to assess the importance of these nutrients along a transect in Florida Bay when a cyanobacterial bloom occurred in the central region in November 2002. These techniques included measurements of ambient particulate and dissolved nutrients, enzyme (urease and alkaline phosphatase) activities, and experiments to determine rates of 15N uptake (nitrate, ammonium, urea, and amino acids over a period of 0.5 h) and long-term (48 h) changes in microbial biomass and 15N natural abundance in enrichment bioassays. The cyanobacterial ...
Gradual environmental changes due to eutrophication and global warming can cause a rapid depletion of oxygen levels in lakes and coastal waters. A new study involving a collaboration between researchers at the University of Amsterdam and the University of Edinburgh shows that microorganisms play a key role in these disastrous regime shifts. These findings were published in the journal Nature Communications on 6 October.
Phosphorus (P) losses from agricultural fields through leaching are the main contributors to eutrophication of lakes and rivers in North America. Adoption
Justus, B.G., Petersen, J.C., Femmer, S.R., Davis, J.V. and Wallace, J.E., 2010, A comparison of algal, macroinvertebrate, and fish assemblage indices for assessing low-level nutrient enrichment in wadeable Ozark streams: Ecological Indicators vol. 10, no. 3, p. 627-638. doi: 10.1016/j.ecolind.2009.10.007 Available Online. Ashbury, Clyde E., and Oaksford, Edward T., 1997, A comparison of drainage basin nutrient inputs with instream nutrient loads for Seven Rivers in Georgia and Florida, 1986-90: U.S. Geological Survey Water-Resources Investigations Report 97-4006, 8 p. Available Online. Alexander, Richard B., Johnes, Penny J., Boyer, Elizabeth W., and Smith, Richard A., 2002, A comparison of models for estimating the riverine export of nitrogen from large watersheds: Biogeochemistry, vol. 57, no. 58, p. 295-339. doi: 10.1023/A:1015752801818 Available Online. Bradbury, J.P., and Van Metre, P.C., 1997, A land-use and water-quality history of White Rock Lake Reservoir, Dallas, Texas, based on a ...
It has been proposed that fertilizer cocktails of macro- and micronutrients should be manufactured on land and transported by submarine pipe to a region significantly beyond the edge of the continental shelf. The nutrient ratios and the temporal supply rates could be controlled so that biological populations develop that optimize sequestration. Such environmental manipulation is today carried out in a sophisticated manner in terrestrial glasshouses where the physical conditions can be controlled, but, with close monitoring, there is no a priori reason why this should not also be possible in an environment such as the open ocean where control of the physical environment is unlikely to be possible.. Empirical support for this approach has been based largely on the observations that the substantial leakage of agricultural fertilizer to coastal seas increases production greatly (with the associated problems of excessive eutrophication; §3a). In the open oceans, observations have been limited to a ...
The report also updates other areas of progress, including efforts to define methodologies for measuring the positive impact of Novus products on the environment. In 2014, Novus participated in the Specialty Feed Ingredients Sustainability (SFIS) project. The SFIS project brings together companies and associations dedicated to reducing the environmental impact of livestock through innovative specialty feed ingredients. Overall results of the study showed the use of SFIs in animal diets reduces the consumption of basic feed ingredients as compared to not feeding SFIs. This leads to clear reductions of the global warming potential, as well as the eutrophication and acidification potential of livestock production. The 2014 Novus Sustainability Report was prepared according to the Global Reporting Initiative (GRI) G-4 standards. GRI is a non-profit, multi-stakeholder organization that seeks to increase the level of business transparency by promoting sustainability reporting among companies ...
A long-term eutrophication process observed from the changes in the horizontal distribution of profundal oligochaete fauna in mesotrophic-eutrophic Lake Kawaguchi, Japan ...
Typically, wastewater is drained away via a complex network of tunnels that requires vast financial resources just for its maintenance, an infrastructure thats undoubtedly deteriorating just as fast as tax revenues get siphoned off away from public works budgets to General Motors and Bank of America. Miles and miles away from its point of origin, the water then gets treated in an energy intensive process. But it still isnt entirely clean afterwards. Thus, when discharged, it still poses a risk to bodies of water, contributing in many instances to elevated bacterial count and eutrophication." ...