One of the largest and longest experiments ever done to test the impact of nutrient loading on coral reefs today confirmed what scientists have long suspected — that this type of pollution from sewage, agricultural practices or other sources can lead to coral disease and bleaching.
A three-year, controlled exposure of corals to elevated levels of nitrogen and phosphorus at a study site in the Florida Keys, done from 2009-12, showed that the prevalence of disease doubled and the amount of coral bleaching, an early sign of stress, more than tripled.
However, the study also found that once the injection of pollutants was stopped, the corals were able to recover in a surprisingly short time.
“We were shocked to see the rapid increase in disease and bleaching from a level of pollution that’s fairly common in areas affected by sewage discharge, or fertilizers from agricultural or urban use,” said Rebecca Vega-Thurber, an assistant professor in the College of Science at Oregon State University.
“But what was even more surprising is that corals were able to make a strong recovery within 10 months after the nutrient enrichment was stopped,” Vega-Thurber said. “The problems disappeared. This provides real evidence that not only can nutrient overload cause coral problems, but programs to reduce or eliminate this pollution should help restore coral health. This is actually very good news.”
The findings were published today in Global Change Biology, and offer a glimmer of hope for addressing at least some of the problems that have crippled coral reefs around the world. In the Caribbean Sea, more than 80 percent of the corals have disappeared in recent decades. These reefs, which host thousands of species of fish and other marine life, are a major component of biodiversity in the tropics.
For more on this story, click here.
Photo courtesy of Oregon State University
Jeff chats to… Paul Cox, CEO of the Shark Trust about the Big Shark Pledge (Watch Video)
The Big Shark Pledge aims to build one of the biggest campaigning communities in the history of shark conservation. To put pressure on governments and fisheries. And make the positive changes required to safeguard awesome sharks and rays.
Rather listen to a podcast? Listen to the audio HERE on the new Scubaverse podcast channel at Anchor FM.
Marine Conservation Society to take legal action over ocean sewage spills
The Marine Conservation Society is announcing joining as co-claimant in a legal case against the UK Government’s Department for Environment, Food and Rural Affairs (DEFRA) to protect English seas from sewage dumping.
The legal case seeks to compel the Government to rewrite its Storm Overflows Discharge Reduction Plan 2022, impose tighter deadlines on water companies and redevelop the Plan to effectively apply to coastal waters which are, currently, almost entirely excluded.
Sandy Luk, Marine Conservation Society CEO: “Untreated sewage is being pumped into our seas for hundreds of thousands of hours each year; putting people, planet and wildlife at risk.
We’ve tried tirelessly to influence the UK Government on what needs to be done, but their Plan to address this deluge of pollution entering our seas is still unacceptable. We owe it to our members, supporters and coastal communities to act, which is why we’ve joined as co-claimants on this case. We’re out of options. Our seas deserve better.”
Launched and funded by the Good Law Project, the Marine Conservation Society will stand as co-claimants on the case with Richard Haward’s Oysters, and surfer and activist, Hugo Tagholm.
Before reaching this point, the charity responded to a government consultation in March 2022 and met with DEFRA to express concern. In August 2022, the charity wrote an open letter to DEFRA outlining the ways in which the proposed Storm Overflow Discharge Reduction Plan fails to protect the environment and public health from dumping raw sewage into the sea. However, the Plan hasn’t been amended and still fails to adequately address water companies’ excessive reliance on storm overflows and the harm their heavy use causes to our ocean.
The plan virtually excludes most coastal waters (except for bathing waters) either directly or indirectly, with some types of Marine Protected Areas and shellfish waters totally excluded. 600 storm overflows are not covered at all by the Plan and will continue to – completely legally – be able to dump uncontrolled amounts of sewage directly into English seas and beaches. What’s more, the Plan lacks all urgency – with long-term targets set for 2050, and the earliest, most urgent targets not to be met until 2035.
Meanwhile, Marine Conservation Society analysis finds that raw sewage is pouring into the ocean at an alarming rate. In total, there are at least 1,651 storm overflows within 1km of a Marine Protected Area (MPA) in England. These overflows spilt untreated sewage 41,068 times in 2021. Of these, almost half the overflows spilt more than 10 times in 2021, with an average of 48 spills for each of those overflows. Overall, in 2021, sewage poured into Marine Protected Areas for a total of 263,654 hours.
According to DEFRA’s own latest assessments, only 19% of estuaries and and 45% of coastal waters are at ‘good ecological status’, with none meeting ‘good chemical status’, and three quarters (75%) of shellfish waters failing to meet water quality standards.
Rachel Wyatt, Policy & Advocacy Manager for Clean Seas at the Marine Conservation Society: “Untreated sewage contains a cocktail of bacteria, viruses, harmful chemicals, and microplastics. It’s nearly impossible to remove microplastics and ‘forever chemicals’ once in the environment. Due to their persistence, with every discharge, these pollutants will continue to increase, meaning eventually they will pass – or may have already passed – a threshold of harm.”
In addition, it’s not just invisible toxins that are causing problems. In September this year at the charity’s annual Great British Beach Clean, sewage related pollution, such as wet wipes and sanitary products, were found on 73% of the beaches surveyed across England.
A new DEFRA report, Ocean Literacy in England and Wales, shows that 85% of people say marine protection is personally important to them. Yet this is being ignored.
Emma Dearnaley, Legal Director at the Good Law Project, said: “The Marine Conservation Society is at the forefront of tackling the ocean emergency and standing up for coastal communities impacted by climate change and pollution. We are delighted to have them on board as a co-claimant.
“Good Law Project will work closely with the claimants, including the Marine Conservation Society, to put forward the case for more ambitious and urgent measures to reduce sewage discharges by water companies. These sewage spills are threatening human health, biodiverse marine life and the fishing industry. We believe that taking legal action now is vital to help safeguard our coastal waters for generations to come”.
If the case is won, the Marine Conservation Society hopes to see the UK Government amend its Plan so that it meets the DEFRA Secretary of State’s legal obligations to protect the ocean and its inhabitants from raw sewage spills.
For more visit the Marine Conservation Society website.
Header image credit: Natasha Ewins
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