New research has indicated that, at its current levels in the environment, a commonly used antibiotic (chlortetracycline) is toxic to freshwater bacteria. Moreover, when combined with four other antibiotics, the collective effect is greater than the sum of the individual effects.

To test the possible health impacts of human exposure to methylmercury through fish consumption, researchers fed mice a diet containing fish at levels that corresponded to a typical Western diet for humans. The mice suffered adverse health impacts after two months of being fed this diet, including reduced body growth rates and modified gene expression patterns.

A US study has concluded that issuing public health advice on fish consumption is the best short-term solution to reducing people’s exposure to mercury contamination. Reducing mercury emissions at source is considered a longer-term solution. Health advice should be targeted towards populations at greatest risk and consider the pollution levels of the water from which the fish came.

A new tool has been developed which highlights ‘hot spots’ of pharmaceutical pollution in Europe, where human health and aquatic environments could potentially be affected. The results suggest that the substances and locations posing the greatest risk are not the same for the aquatic environment as for human health.

Methylmercury may accumulate more quickly in fish as the climate grows warmer, new research suggests. Researchers in the US have found that levels of the toxin were higher in fish exposed to higher temperatures; global warming could therefore lead to increased human exposure to methylmercury through seafood consumption.

Mercury, in the form of monomethylmercury, can accumulate in fish to high concentrations, presenting the greatest concern for human exposure to this potent neurotoxin. New long-term research of fish in a natural setting has shown that removal rates of the toxin from body tissues are likely to be even slower than thought.

A new study assessing the levels, and potential health risk, of toxic heavy metals in market-bought fish and shellfish in Spain has found that they are generally below European Commission regulatory limits, and that these products are therefore safe to eat for the average consumer in Spain. However, for high level consumers of specific fish species, toxic element levels could pose a risk to health.

Leakage of radioactive material from the wreck of the nuclear submarine K-159 in the Barents Sea could increase levels of radioactivity in local populations of cod by a hundred times, new research suggests. However, this level remains well below ‘safe’ standards set by the Norwegian government.

Farmers could help to maintain populations of bees and other pollinators by sowing inexpensive seed mixes on their land, a new study suggests. Researchers surveyed pollinators visiting study plots in Berkshire, UK, and explored how sowing different seed mixes and using different management techniques affected the flowers produced and the pollinators visiting them.

Thousands of tonnes of chemical warfare agents were dumped into the Baltic Sea after the Second World War. A recent study has shown that fish caught near the dumping grounds show high levels of genetic and cell damage, revealing the long legacy of these toxic substances.

The Deepwater Horizon oil spill is likely to have damaged large numbers of tuna and amberjack fish embryos, new research suggests. Fish embryos exposed to oil samples taken during the spill developed abnormalities in their hearts and, consequently, their spines, fins and eyes. This is likely to have caused population declines in these commercially important species, the researchers conclude.

Polycyclic aromatic hydrocarbon (PAH) contamination in catfish in Italian rivers has been found to exceed EC limits, a new study has found. Benz[a]pyrene, which can potentially cause cancer, was found in all samples and in 9% exceeded limits set in EU food safety legislation. Heavy road traffic and inadequately treated wastewater are the most likely cause of these high levels of PAH pollution, say the researchers.

Levels of aquaculture pesticides exceed UK environmental quality standards (EQSs) in samples taken from near Norwegian fish farms, a recent study has shown. The researchers examined five pesticides used to kill sea lice (Lepeophtheirus salmonis) and showed that in many cases their concentrations exceeded UK EQSs. They used UK standards, they explain, because there are currently no Norwegian EQSs for these chemicals, and call for international quality standards to be drawn up.

Oil spills can decimate seabird populations. Some birds can be saved, if the oil is washed from their feathers in time; however, this long process is stressful for the birds and requires numerous volunteers. Researchers have now developed a ‘bird-washing machine’ which reduces the washing time from two hours to four minutes. When trialled on oiled birds rescued from the Caspian Sea this resulted in a substantial increase in survival: 88.5% survival after seven days compared to 50% survival with current washing techniques.

Mercury contamination of some wild fish species in areas of the Czech Republic may put anglers’ health at risk, a new study suggests. The research showed that EU-wide and Czech national regulatory limits for mercury were exceeded in at least one analysed sample at 63% of the sites surveyed. However, contamination levels varied substantially between locations and species, the researchers say.

The health of almost half of all European freshwaters is at risk from organic chemical pollution, finds new research. The study, a continental-scale risk assessment of the potential effects of toxic organic chemicals on freshwater ecosystems, based its conclusions on data for over 200 pollutants measured at 4000 monitoring sites across Europe.

Neonicotinoid and fipronil insecticides have a range of impacts on birds, mammals and fish, a new review of scientific literature has found. A house sparrow would need to eat just one and a half beet seeds treated with a common neonicotinoid to receive a lethal dose, for instance. The insecticides may also have equally important effects on vertebrate wildlife, such as reducing insect prey and hence food supply.

A drug used to treat parasite infections at fish farms can contaminate the surrounding environment and threaten local wildlife, a new study shows. Following a week-long treatment at a Norwegian salmon farm, the authors found concentrations of an anti-sea-lice drug that were high enough to kill some crabs, shrimps and lobsters. However, they suggest the drug is not likely to pose a risk to humans.

Wastewater emptied from commercial fishing boats is an overlooked source of marine pollution, a new US study shows. The researchers suggest that this type of pollution should be given further consideration when assessing the overall environmental impact of fishing, as it may pose a risk to human health and marine life.

A new method for mapping the spread of oil released by ships is presented in a recent study, where it is applied to the Adriatic and Ionian Seas of the Mediterranean. The method pulls together a range of data, including information on shipping routes, oil particle behaviour, currents and climate. In this case study, it reveals pollution hotspots in the south-western Adriatic Sea and north-eastern Ionian Sea.

Fish fed polystyrene nanoparticles are less active and show changes to their brains and metabolism, according to a study by Swedish and Danish researchers. The findings suggest that nanoparticles in the environment could have a major impact on fish and aquatic ecosystems.

The risk of eutrophication as a result of nitrogen and phosphorus pollution in Europe’s freshwaters fell by 22% in lakes and by 38% in rivers between 1985 and 2011, new research has shown. The researchers analysed data across 88 European river basins using a new statistical approach which could be used to help identify factors which increase eutrophication risks.

A novel approach for identifying and isolating anthropogenic – including microplastic – particles in fish stomachs has been devised by researchers in Belgium. The new method may enable scientists and policymakers to better assess the presence, quantity and composition of particles ingested by marine life, and improve understanding of the environmental effects of marine plastic pollution.

Intersex fish, in which male reproductive tissues become ‘feminised’, are increasingly being identified. This effect has traditionally been attributed to birth-control medications. This study exposed fish to a widely prescribed anti-diabetic, metformin. Male fish developed female sexual characteristics and reproductive rate decreased, which suggests that metformin may be a non-traditional endocrine-disrupting compound.

Lithium production has increased dramatically during the past decade. A new study has found that exposure of rainbow trout to lithium results in fast accumulation in plasma and the brain, along with decreased concentrations of ions such as sodium.

Nitrogen and phosphorus pollution change the relationship between the tropical coral Stylophora pistillata and the algae living inside its tissues, a recent study has found. The researchers say the pollutants, mainly from urban and agricultural discharges, affect algae photosynthesis and the essential transfer of carbon from algae to the coral.

To assess the risk posed by metals in the aquatic environment, Biotic Ligand Models (BLMs) were developed, and are now considered suitable for use in regulatory risk assessments. This study reviews the advantages of BLMs and BLM-based software tools, providing examples from across the EU, and offers recommendations for their widespread implementation.

Researchers have recommended that fish from some sections of the River Po and the River Lambro, one of the Italian River Po tributaries, should not be eaten due to high levels of some endocrine-disrupting chemicals in the river sediments and fish. This recommendation is based on an extensive update regarding pollution levels of such substances in the rivers.

The non-restricted production and use of pharmaceuticals and personal care products (PPCPs) has led to their presence in effluents from treatment plants, which can pose a threat to aquatic organisms downstream. This study analysed the breakdown of six common chemicals in four Danish treatment plants. The findings shed new light on the factors affecting removal of PPCPs from waste, showing that the composition of waste is more important than the design of the treatment plant.

A study of the pollution caused by ship scrapping in Alang, India, shows significantly higher levels of heavy metal and petroleum hydrocarbons in sediment and seawater, compared to a control site. The researchers also found reduced populations of zooplankton — a critical food source for marine biota — and increased numbers of pathogenic bacteria.

Pollutants have been shown to alter the structure of bacterial communities in the coastal waters around the Alang-Sosiya shipbreaking yard in north-west India. The research analysed seawater from two sites near Alang-Sosiya and from pristine sea water taken 10 km from the coast. The results provide a clearer idea of changes to the microbial ecology near a large ship recycling yard.

The Alang shipbreaking yards in India recycle almost half of all end-of-life ships worldwide. The major activity at the yards is plate-cutting, used to recover steel from ships. This process consumes nearly 29 kg of oxygen and 7 kg of liquefied petroleum gas (LPG) and emits almost 22 kg of CO2 per 1 km-long cut with a 1 mm depth. This study reveals the carbon footprint and resources consumed in the cutting of steel plates. The method used to derive these findings could be adapted to ship dismantling yards worldwide.

Researchers have shown that in the Baltic Sea the abundance of common fish species, used as an indicator of ecosystem health, is influenced by climate-related oceanic conditions at a local scale, such as sea temperature. The researchers suggest, therefore, that the environmental status of coastal fish communities in the region should be assessed and managed at a local scale.

Up to 90% of consumed drugs enter the environment. This may have negative effects on wildlife, especially when the drugs take long periods to break down. This study assessed the breakdown of sulphonamides — a class of antibacterials — in samples from two rivers in Poland. The results showed that sulphamethoxazole, a common veterinary antibiotic, was the most persistent and that various factors inhibit degradation, including low temperatures, heavy metal pollution and low pH.

A new study has investigated the movement of antibiotic resistance genes between farm animals, soil and water in Finland. The results show that many of these genes are spread from animals to the soil through manure application; however, these genes do not appear to persist in soil. The study suggests that practices that minimise the use of antibiotics, as used in Finland, may lead to lower levels of clinically relevant resistance genes in agricultural soils.

Neonicotinoids are pesticides applied to plants to protect them from insects. The use of neonicotinoids may lead to contamination of aquatic environments through, among other routes, the input of contaminated plant material into waterways. While it is well established that direct exposure to contaminated water endangers aquatic invertebrates, scientists have now published findings indicating that dietary exposure through the consumption of contaminated plant material puts leaf-shredding species at increased risk. The researchers recommend that policymakers registering systemic insecticides (those whose active ingredients are transported throughout the plant tissues) consider dietary exposure, and its potential implications for ecosystem integrity, in addition to other exposure pathways.

Of all the MATLAB or MathWorks toolbox functions that have been mentioned in this blog since 2006, imshow and imread have appeared the most. As in last week's post, they often appear together, right at the beginning: ... read more >>

Today I will show you how I plotted this treble clef symbol in MATLAB:... read more >>

EU-supported research has established a new model to calculate air pollution emissions from ships. Its calculations could create a database that lists emissions per ship type and size as well as by country.

Measures to reduce greenhouse gas (GHG) emissions have the additional benefit of reducing air pollutants. However, these benefits are rarely included in the design and evaluation of climate change policies. A new study suggests that considering these benefits in climate change policy could reduce the cost of such policies, and engage stakeholders who are otherwise unmotivated to tackle climate change.

To reduce air pollution levels in harbours, EU Directive 2005/33/EC requires all anchored ships to use fuels with low sulphur content. A recent study of air quality in Mediterranean harbours shows that levels of sulphur dioxide have decreased significantly since the Directive was implemented in 2010.

A study on the transport of radioactive isotopes from Fukushima in the two months after the nuclear incident suggests that they were at official levels of contamination for 34,000 km2 of Japan, and that 2.8% of iodine radionuclides from the event were calculated to have reached the EU.

A recent global study has estimated that, each year, 1.5 million people die early from cardiopulmonary diseases and 0.1 million people die early from lung cancer caused by exposure to PM2.5 pollution. A further 0.4 million people are estimated to die early from respiratory diseases caused by exposure to surface ozone (O3) pollution. Although short-lived air pollutants have the largest influence on air quality and premature deaths, controlling methane emissions as well would improve air quality and reduce the number of people dying prematurely each year, the study suggests.

Levels of air pollution significantly increase on the island of Svalbard in the Norwegian Arctic when tourist cruise ships are present, according to a recent study. With shipping levels rising in the region, the researchers recommend that stricter emissions regulations are introduced in order to limit the impact of pollution on the Arctic environment.

Inhaling volcanic ash could weaken the body’s natural defences against infection, a recent study concludes. A team of researchers collected samples of ash from the 2010 Eyjafjallajökull volcano eruption in Iceland and, in laboratory tests, found that they reduced the ability of immune cells in lungs to fight off bacterial infections.

The public health impacts of air pollution in Europe remain large, but are falling thanks to regulatory actions to cut emissions, a recent study finds. However, it issues a warning about the public health impacts of emissions from rising levels of international ship traffic.

Strong acids formed from shipping emissions can produce seasonal ‘hot spots’ of ocean acidification, a recent study finds. These hot spots, in ocean areas close to busy shipping lanes, could have negative effects on local marine ecology and commercially farmed seafood species.

‘Critical levels’ of ozone exposure for plants, above which significant adverse effects may occur, are currently calculated by examining ozone’s impacts on only a small number of species. However, researchers have now compared this measure with a new approach which examines all species in a group, and defines the critical levels as the concentration at which 5% of species are affected. These critical levels, which may be more suitable for semi-natural ecosystems, are stricter than current standards.

Air quality in the Greek city of Thessaloniki has worsened during the recent economic crisis, as residents burn more wood and other types of biomass to keep warm. A recent study has found a 30% increase in the concentration of fine particle (PM_2.5) emissions associated with wood smoke from residential heating in 2012 and 2013, with implications for the health of local residents.

Indoor air quality can be significantly improved using a simple device which traps harmful chemicals emitted from glues, paints and building materials, a new study has shown. Designed in Sweden, the researchers demonstrate that the 'surface emissions trap', especially effective for damp buildings, also prevents emissions from mould and can remove unpleasant odours.