Radioactive iodine was found in kelp off the US West Coast following last year’s earthquake-triggered Fukushima Daiichi nuclear meltdown, according to a new study.
It was already known that radioactive iodine 131 (131-I), carried in the atmosphere, made it across the Pacific within days of the March 11, 2011 tsunami disaster, albeit in minuscule amounts.
But marine biologists at California State University, Long Beach (CSULB) discovered the radioactive isotope in ocean kelp, which is “one of the strongest plant accumulators of iodine,” within a month of the accident.
“We measured significant, although most likely non-harmful levels of radioactive iodine in tissue of the giant kelp Macrocystis pyrifera,” said Steven L. Manley, author of the study with Christopher G. Lowe
“Although it is probably not harmful for humans because it was relatively low levels, it may have affected certain fish that graze on the tissue because fish have a thyroid system that utilizes iodine.”
The study, “Canopy-Forming Kelps as California’s Coastal Dosimeter: 131I from Damaged Japanese Reactor Measured in Macrocystis pyrifera,” appears in the online edition of the journal Environmental Science & Technology.
In 1872 the HMS Challenger pulled out from Portsmouth, England to begin an unprecedented scientific expedition of the world’s oceans. During its over three year journey the HMS Challenger not only collected thousands of new species and sounded unknown ocean depths, but also took hundreds of temperature readings—data which is now proving invaluable to our understanding of climate change.
Utilizing the temperature data from the HMS Challenger expedition and comparing it to contemporary temperatures, researchers writing in Nature Climate Change found that the oceans’ surface— where marine warming is most intense—saw temperature rise on average by 0.59 degrees Celsius (1.1 degrees Fahrenheit) over the past 135 years or so. This implies that oceanic temperatures have been rising for at least a century.
“The significance of the study is not only that we see a temperature difference that indicates warming on a global scale, but that the magnitude of the temperature change since the 1870s is twice that observed over the past 50 years,” explains lead author Dean Roemmich, University of California San Diego physical oceanographer. “This implies that the time scale for the warming of the ocean is not just the last 50 years but at least the last 100 years.”
Prior research has shown that 90 percent of the heat added to the atmosphere has ended up in the oceans, at least since the 1960s. Roemmich told LiveScience that this implies, “the ocean temperature is probably the most direct measure we have of the energy imbalance of the whole climate system.”
While the HMS Challenger took temperatures at over 300 stations with mercury, pressure, and resistance thermometers, today some 3,500 free-floating Argo robotic probes roll through the seas gathering temperature data.
Temperatures globally, including both land and sea, have risen about 0.8 degrees Celsius (1.44 degrees Fahrenheit) since the first decade of the 1900s. The rate of warmth has doubled since 1950. Scientists overwhelmingly agree that climate change is occurring due to greenhouse gas emissions from burning fossil fuels.
A federal judge has suspended the construction of a 1,820 megawatt dam on the Teles Pires River in the Amazon. The judge found that indigenous communities were not properly consulted about the dam, which would flood a sacred site, known as the Seven Waterfalls, as well as imperil the livelihoods of indigenous fishermen.
“The compensation [the government is] offering will never substitute places that are sacred to us, such as Sete Queda [Seven Waterfalls], that hold the cemeteries of our ancestors and that should be preserved. Sete Quedas is also the spawning grounds of fish that are an important source of food. They talk about fish ladders, but where have these ever worked?” Taravy Kayabi, a leader of the indigenous Kayabi people, said in a press release, adding that, “The government needs to look for alternative ways to generate energy that don’t harm indigenous peoples and their territories.”
The judge ordered that the indigenous tribes of the Kayabi, Manduruku, and Apiaká must be consulted before any further construction can occur on the Teles Pires Dam, named after the river. Breaking the suspension will result in a fine of $100,000 per day.
Still, NGOs warn that this is not the end of the Teles Pires Dam.
“What we’ve seen over and over again, in cases such as [the Belo Monte dam], is that the President’s office politically intervenes in regional federal courts to overturn decisions against violations of human rights and environmental legislation, using false arguments, such as an impending blackout if the dams aren’t immediately constructed,” said Brent Millikan, Amazon Program Director with International Rivers in a press release.
The Brazilian government is planning to build a number of massive hydroelectric projects in the Amazon, including the hugely controversial Belo Monte dam. The federal government argues it needs the energy in order to continue with development plans, but critics say that dams threaten already marginalized indigenous communities, ruin wild rivers, destroy pristine rainforest, and release greenhouse gases due to rotting vegetation in reservoirs.
Six hydroelectric projects are currently planned on the Teles Pires River.
A new study of dolphins living close to the site of North America’s worst ever oil spill – the BP Deepwater Horizon catastrophe two years ago – has established serious health problems afflicting the marine mammals.
The report, commissioned by the National Oceanic and Atmospheric Administration [NOAA], found that many of the 32 dolphins studied were underweight, anaemic and suffering from lung and liver disease, while nearly half had low levels of a hormone that helps the mammals deal with stress as well as regulating their metabolism and immune systems.
More than 200m gallons of crude oil flowed from the well after a series of explosions on 20 April 2010, which killed 11 workers. The spill contaminated the Gulf of Mexico and its coastline in what President Barack Obama called America’s worst environmental disaster.
The research follows the publication of several scientific studies into insect populations on the nearby Gulf coastline and into the health of deepwater coral populations, which all suggest that the environmental impact of the five-month long spill may have been far worse than previously appreciated.
Another study confirmed that zooplankton – the microscopic organisms at the bottom of the ocean food chain – had also been contaminated with oil. Indeed, photographs issued last month of wetland coastal areas show continued contamination, with some areas still devoid of vegetation.
The study of the dolphins in Barataria Bay, off the coast of Louisiana, followed two years in which the number of dead dolphins found stranded on the coast close to the spill had dramatically increased. Although all but one of the 32 dolphins were still alive when the study ended, lead researcher Lori Schwacke said survival prospects for many were grim, adding that the hormone deficiency – while not definitively linked to the oil spill – was “consistent with oil exposure to other mammals”.
Schwacke told a Colorado based-publication last week: “This was truly an unprecedented event – there was little existing data that would indicate what effects might be seen specifically in dolphins – or other cetaceans – exposed to oil for a prolonged period of time.”
The NOAA study has been reported at the same time as two other studies suggesting that the long-term environmental effects of the Deepwater Horizon spill may have been far more profound than previously thought.
A study of deep ocean corals seven miles from the spill source jointly funded by the NOAA and BP has found dead and dying corals coated “in brown gunk”. Deepwater corals are not usually affected in oil spills, but the depth and temperatures involved in the spill appear to have been responsible for creating plumes of oil particles deep under the ocean surface, which are blamed for the unprecedented damage.
Charles Fisher, one of the scientists who jointly described the impact as unprecedented, said he believed the colony had been contaminated by a plume from the ruptured well which would have affected other organisms. “The corals are long-living and don’t move. That is why we were able to identify the damage but you would have expected it to have had an impact on other larger animals that were exposed to it.”
Chemical analysis of oil found on the dying coral showed that it came from the Deepwater Horizon spill.
The latest surveys of the damage to the marine environment come amid continued legal wrangling between the US and BP over the bill for the clean-up. BP said the US government was withholding evidence that would show the oil spill from the well in the Gulf of Mexico was smaller than claimed. Last week BP, which has set aside $37bn (£23bn) to pay for costs associated with the disaster, went to court in Louisiana to demand access to thousands of documents that it says the Obama administration is suppressing.
New photographic evidence proves Ethiopia’s controversial plantations scheme is killing the Lower Omo River, a lifeline for 100,000 tribal people.
The Omo River downstream from the notorious Gibe III dam is now being diverted into a newly-dug irrigation canal, one of several which will feed a massively ambitious plantations scheme for state and private investors.
These manmade canals are key to Ethiopia’s plantations plan, which is already having a hugely negative impact on UNESCO’s Lower Omo World Heritage site.
The government has revealed virtually nothing about the plantations program, but an official map obtained by Survival shows the enormous scope of the project.
One local person, speaking to a Survival researcher who recently visited the area, said, ‘I’ve never seen the river this low. During the dry season, like it is now, you can usually cross by foot, and water reaches your knees. Now I could cross without my feet getting wet.’
The Gibe III dam, 200 kms upstream, will interrupt the river’s natural flow and deprive thousands of tribespeople of their most valuable agricultural land by stopping the annual flood.
The flooding of the Omo River feeds the rich biodiversity of the region and ensures tribes such as the Bodi, Mursi and Dassanach can feed their cattle and produce beans and cereals in the fertile silt left behind.
There was a flood last year, but most Bodi and Mursi were not able to use it for cultivation because of the irrigation project. There will be no flood this year, as the dam reservoir starts to fill, nor in succeeding years. The people have been told they will be given food aid in compensation.
Indigenous communities are also suffering from violent human rights abuses, as plans are implemented forcibly to resettle those who stand in the way of the government’s plans, and to take away their cattle.
Survival’s Director Stephen Corry said today, ‘Ethiopia’s government is destroying the Lower Omo Valley and the livelihoods of tens of thousands of indigenous people – all in the name of ‘development’. However the human cost cannot be ignored. Re-directing a water lifeline is irresponsible and reckless.’
