Search

Metal Pollution Reduction Linked to Increased Biodiversity in English Rivers, Study Finds

We are an online community created around a smart and easy to access information hub which is focused on providing proven global and local insights about sustainability

24 Feb, 2025

This post was originally published on Eco Watch

It stands to reason that if you reduce the amount of pollution in an environment, the organisms there will thrive. Now, a study confirms that is happening in rivers in England. According to the research, reducing the amount of metal pollutants like zinc and copper in English rivers led to an increase in the aquatic biodiversity of macroinvertebrates.

As coal and heavy industry have declined, related river pollution also cleared up, allowing more invertebrates to thrive, the study published in Environmental Science & Technology found.

A team led by the UK Centre for Ecology & Hydrology (UKCEH) analyzed over 65,000 observations 1,457 sites from 1989 to 2018 found in the UK Environmental Agency’s data.

In their findings, reduction in metal pollutants had the biggest impact on invertebrate biodiversity, although other pollution reduction, such as sewage, also impacted the variety of invertebrate species. According to the findings, zinc levels below 14 micrograms per liter and copper levels below 3.3 micrograms per liter led to the biggest improvements in species richness.

The authors estimated that metal pollutants and sewage may have declined for multiple reasons, including reduced coal dependence, which would lead to a decline in acid rain that contribute to metal pollution in waterways. Some of the ammonia, organic matter, and other pollutant declines could also be attributed to the 1991 European Urban Wastewater Treatment Directive and improved agricultural practices, according to the study.

With strong evidence that zinc & copper concentrations have the biggest influence on invertebrate species richness, efforts to increase freshwater biodiversity are unlikely to bear fruit without further reductions in these metals, lead author Prof Andrew Johnson said

🔗 www.ceh.ac.uk/press/biodiv…

[image or embed]

— UK Centre for Ecology & Hydrology (UKCEH) (@ukceh.bsky.social) February 18, 2025 at 8:09 AM

“There is a widespread desire by the public to improve water quality and biodiversity in our rivers but the problem for policymakers is what steps would be most likely to achieve results,” Andrew Johnson, lead author of the study and environmental research scientist at UKCEH, said in a statement. “Our study provides strong evidence that concentrations of zinc and copper have the biggest influence on invertebrate species richness, so future attempts to increase freshwater biodiversity are unlikely to bear fruit without further reductions in these metals.”

The study determined that while river biodiversity improved in the 1980s and 1990s with reduced metal pollution, the species richness has mostly plateaued since 2000, and the authors cited other research that has shown similar trends across North America and Europe.

The authors wrote that more research is needed to determine what urban land cover pollutants most impact biodiversity of invertebrates, and that runoff from urban areas could still contribute to higher levels of zinc and carbon pollution that may not be detected in routine river sampling. Further, the study found that higher levels of metal pollution continue to exist downstream from former mines.

These factors will need to be considered for environmental protection efforts, as the UK’s Department for Environment Food and Rural Affairs (Defra) has set a target to reduce the length of rivers impacted by metal pollutants from mines by half by 2038.

“The way priority chemicals are currently identified for action, ensuring aquatic wildlife may be better protected, could be described as ‘top-down,’” the authors concluded in the study.

“Here, we used a ‘bottom-up’ approach, relying on a statistical analysis of large wildlife and stressor field data sets (consistent monitoring by regulatory agencies being critical to this approach) to identify factors that are most closely associated with biodiversity. We suggest that this approach has considerable merit and at the very least can act as a sense check on the traditional approach.”

The post Metal Pollution Reduction Linked to Increased Biodiversity in English Rivers, Study Finds appeared first on EcoWatch.

Pass over the stars to rate this post. Your opinion is always welcome.
[Total: 0 Average: 0]

You may also like…

Land water loss causes sea level rise in 21st century

Land water loss causes sea level rise in 21st century

An international team of scientists, led jointly by The University of Melbourne and Seoul National University, has found global water storage on land has plummeted since the start of the 21st century, overtaking glacier melt as the leading cause of sea level rise and measurably shifting the Earth’s pole of rotation.

Published in Science, the research combined global soil moisture data estimated by the European Centre for Medium-Range Weather Forecast (ECMWF) Reanalysis v5 (ERA5), global mean sea level measurements and observations of Earth’s pole movement in order to estimate changes in terrestrial (land) water storage (TWS) from 1979 to 2016.

“The study raises critical questions about the main drivers of declining water storage on land and whether global lands will continue to become drier,” University of Melbourne author Professor Dongryeol Ryu said.

“Water constantly cycles between land and oceans, but the current rate of water loss from land is outpacing its replenishment. This is potentially irreversible because it’s unlikely this trend will reverse if global temperatures and evaporative demand continue to rise at their current rates. Without substantial changes in climate patterns, the imbalance in the water cycle is likely to persist, leading to a net loss of water from land to oceans over time.”

Between 2000 and 2002, soil moisture decreased by around 1614 gigatonnes (1 Gt equals 1 km3 of water) — nearly double Greenland’s ice loss of about 900 Gt in 2002–2006. From 2003 to 2016, soil moisture depletion continued, with an additional 1009 Gt lost.

Soil moisture had not recovered as of 2021, with little likelihood of recovery under present climate conditions. The authors say this decline is corroborated by independent observations of global mean sea level rise (~4.4 mm) and Earth’s polar shift (~45 cm in 2003–2012).

Water loss was most pronounced across East and Central Asia, Central Africa, and North and South America. In Australia, the growing depletion has impacted parts of Western Australia and south-eastern Australia, including western Victoria, although the Northern Territory and Queensland saw a small replenishment of soil moisture.

Image credit: iStock.com/ZU_09

In Vivid Reliquaries, Stan Squirewell Layers Anonymous Portraits and Patterned Textiles

In Vivid Reliquaries, Stan Squirewell Layers Anonymous Portraits and Patterned Textiles

Through intimate, mixed-media collages, Stan Squirewell excavates the stories of those who might otherwise be lost in anonymity.
Do stories and artists like this matter to you? Become a Colossal Member today and support independent arts publishing for as little as $7 per month. The article In Vivid Reliquaries, Stan Squirewell Layers Anonymous Portraits and Patterned Textiles appeared first on Colossal.

0 Comments