Britain’s urban rivers are at their cleanest in 20 years, study confirms

Britain’s urban rivers are at their cleanest for over two decades, according to scientists from Cardiff University

5621419191_af918d90f3_oThe 21-year study of over 2,300 rivers measured the presence of clean-river invertebrates – a yardstick for river health – which during the days of heavy industry and poor sewage treatment had declined considerably, but now appear to be making a comeback.

Although climate change has warmed British rivers by around one to two degrees over recent decades, the findings suggest that improved pollution control has managed to offset its damaging effects on river ecosystems. This indicates that society can prevent some undesirable climate change effects on the environment by improving habitat quality.

Dr Ian Vaughan and Professor Steve Ormerod from the University’s School of Biosciences analysed changes in the occurrence and spread of insects, snails and other mini-beasts from major rivers between 1991 and 2011. The researchers then asked whether water quality, temperature or river flow best explained the biological changes they observed.

Among 78 types of organisms examined, 40 have become more prevalent in English and Welsh rivers while 19 have declined. Overwhelmingly, these trends were explained by reductions in gross pollution rather than warming or changing flow caused by climate change.

Improving water quality has allowed some clean-water organisms from upland rivers to return to previously polluted lowland rivers, and may even explain some northwards movement previously attributed to climate-change.

The researchers believe these results to be very encouraging in showing how reductions in pollution can help offset the impacts of climate change. Dr Ian Vaughan said: “Our analysis showed clearly that many British river invertebrates are sensitive to climate – for example; because they require good supplies of oxygen that decline as rivers warm up.

“However, it seems that efforts over the last two to three decades to clean up pollution from sewage and other sources have allowed many of these sensitive organisms to expand their range despite one to two degre warming trends and several periods of drought.”

Prof Steve Ormerod added: “These results reveal part of a larger pattern in which organisms dependent on cleaner waters, faster flows and high oxygen concentrations have been progressively recolonising Britain’s urban rivers: Atlantic salmon, mayflies, and Dippers are prime examples. We need to protect these and other river organisms against climate change effects – and solving other problems such as pollution clearly helps.

“Away from Britain’s urban areas, some pollution problems are increasing, and our analysis shows some negative trends among sensitive organisms such as stoneflies that are typical for rural hill-streams. It’s important that our efforts to protect Britain’s rivers against pollution or climate change are extended to the farmed, rural, upland landscape.”

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