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We need faster, better ways to monitor NZ’s declining river health – using environmental DNA can help

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Wednesday, March 20, 2024

Getty Images/Julia CrimNew Zealand’s rivers are not in a good shape. The Ministry for the Environment’s latest freshwater report shows an estimated 45% of total river length is no longer suitable for swimming and 48% is partially inaccessible to endangered migratory fish. The science is clear. Inputs of nitrogen and phosphorous, coupled with invasive species, stress some rivers to the point where they can’t sustain healthy ecosystems. The state of rivers and groundwater also impacts on the quality of drinking water. The government’s intention to replace the national policy statement on freshwater management brings the topic of freshwater quality back into the national spotlight. But irrespective of political debates, given the perilous state of New Zealand’s freshwater, effective monitoring based on sound evidence is needed in order to weigh trade-offs and understand if we are managing rivers sustainably. This is where environmental DNA (eDNA) comes in. Aotearoa New Zealand will always need multiple methods to monitor the thousands of rivers and streams across the country, but we hope our new eDNA method will help by making freshwater monitoring faster, cheaper, more comprehensive and better suited to countrywide surveys. Read more: It sounds like science fiction. But we can now sample water to find the DNA of every species living there Rivers are full of life The life found in New Zealand’s rivers is a vital component of their health. Microbial diversity is continually degrading and recycling nutrients that sustain new life and maintain river health. Whether fish, frog or falcon, all organisms shed bits of genetic material into the environment. These DNA “breadcrumbs” provide vital clues about what is living in the area. We can test all these DNA signals without actually ever seeing an animal. The same ultra-sensitive technology is already being used to detect COVID in wastewater by tracking SARS-CoV-2 variants and concentrations of the virus. Until eDNA was developed, the primary method we had to monitor river health involved catching (often killing) and sorting thousands of invertebrates or electric fishing. Such methods are time consuming, costly, require specialist expertise and typically need five-year windows to detect a change in river health. The game changer with eDNA is its ability to detect many species at once, employing an easy-to-use (filtration) sampling method. This opens up a raft of possible applications. A small sample of river water can help detect the presence of many species. Author provided, CC BY-SA The Department of Conservation is using eDNA to detect new populations of endangered galaxid fish and the Ministry for Primary Industries is using it to track the spread of the freshwater golden clam that invaded the Waikato river. But there is much more to eDNA than detecting a favourite (or least favourite) animal. The real shift is the ability to read eDNA barcodes across the “tree of life”. ‘Seeing’ entire ecosystems Rather than focusing on just a few select indicator species, eDNA helps us to consider the ecosystem more holistically, such as the example below from the Waikato River, from a single litre of filtered water. An eDNA analysis of one litre of water from the Waikato River shows all the species detected. Wilderlab and Wai Tuwhera o Te Taiao, CC BY-SA In a partnership between the eDNA company Wilderlab, the Department of Conservation, the Ministry for the Environment and regional councils, we harnessed this holistic ecosystem data to develop a new index to measure river health called the Taxon-Independent Community Index, or TICI. Using regularly monitored river sites across Aotearoa New Zealand, we focused on 3,000 eDNA barcodes from bacteria, fungi, plants and animals that are indicators of river nutrification. The TICI index is a score from 60 to 140, based on which of the 3,000 barcode signatures are present. Some barcodes push the dial in a positive direction, others nudge it negative. Raw DNA data can be complex. The TICI index distils the genetic code into a metric that people can more easily engage with. From zero river samples profiled using eDNA in 2019, we now have more than 50,000 eDNA records, including 16,000 TICI scores. Collectively, this has generated one of the most powerful global eDNA datasets, and opens a number of new applications. Teichelmann Creek in the predator-free Perth Valley (in South Westland) currently tops the leader board with a TICI score of 135.03 (pristine). At the other end of the table, Papanui Stream in the Hawke’s Bay generated a TICI of 68.05 (very poor). This infographic shows TICI scores across New Zealand and how they change along a river’s length. Wilderlab, CC BY-SA Where to next for eDNA? We envisage that eDNA-based indicators, like the TICI index, will provide a practical way for people to track health in their local rivers. Communities are already engaging with this tool through the Wai Tuwhera o te Taiao programme. Farmers are getting on board and eDNA techniques feature in the futures thinking of central government. Read more: Consumers want NZ farmers to comply with regulations -- better monitoring and transparency would help to build trust In a 2019 report on New Zealand’s environmental reporting system, the Parliamentary Commissioner for the Environment identified deficiencies and fragmentation in New Zealand’s environmental data gathering and reporting, including for freshwater. We argue that eDNA gets us a step closer to fixing some of these issues. Using the eDNA toolkit it is within our technical (and budgetary) reach for regular monitor of all rivers in Aotearoa to help prioritise where, when and how much management (or restoration) is needed. And there is more to come on the eDNA monitoring front, including methods of sampling eDNA from the air, household taps, shipping containers and around aquaculture facilities. Michael Bunce has received funding from Australia & New Zealand on the use of eDNA technologies, including to work with community groups as part of the Wai Tuwhera o Te Taiao programme at the Environmental Protection Authority. He is currently Chief Science advisor at the Department of Conservation.Simon Jarman currently works with eDNA Frontiers and Wilderlab, companies which offer fee-for-service eDNA services.

Monitoring methods based on environmental DNA are faster, more comprehensive and cheaper than traditional ecological surveys. They help fill gaps in New Zealand’s data on river health.

New Zealand’s rivers are not in a good shape. The Ministry for the Environment’s latest freshwater report shows an estimated 45% of total river length is no longer suitable for swimming and 48% is partially inaccessible to endangered migratory fish.

The science is clear. Inputs of nitrogen and phosphorous, coupled with invasive species, stress some rivers to the point where they can’t sustain healthy ecosystems. The state of rivers and groundwater also impacts on the quality of drinking water.

The government’s intention to replace the national policy statement on freshwater management brings the topic of freshwater quality back into the national spotlight.

But irrespective of political debates, given the perilous state of New Zealand’s freshwater, effective monitoring based on sound evidence is needed in order to weigh trade-offs and understand if we are managing rivers sustainably.

This is where environmental DNA (eDNA) comes in.

Aotearoa New Zealand will always need multiple methods to monitor the thousands of rivers and streams across the country, but we hope our new eDNA method will help by making freshwater monitoring faster, cheaper, more comprehensive and better suited to countrywide surveys.

Rivers are full of life

The life found in New Zealand’s rivers is a vital component of their health. Microbial diversity is continually degrading and recycling nutrients that sustain new life and maintain river health.

Whether fish, frog or falcon, all organisms shed bits of genetic material into the environment. These DNA “breadcrumbs” provide vital clues about what is living in the area. We can test all these DNA signals without actually ever seeing an animal.

The same ultra-sensitive technology is already being used to detect COVID in wastewater by tracking SARS-CoV-2 variants and concentrations of the virus.

Until eDNA was developed, the primary method we had to monitor river health involved catching (often killing) and sorting thousands of invertebrates or electric fishing. Such methods are time consuming, costly, require specialist expertise and typically need five-year windows to detect a change in river health.

The game changer with eDNA is its ability to detect many species at once, employing an easy-to-use (filtration) sampling method. This opens up a raft of possible applications.

A close-up of someone taking a sample of river water. — A small sample of river water can help detect the presence of many species. Author provided, CC BY-SA

The Department of Conservation is using eDNA to detect new populations of endangered galaxid fish and the Ministry for Primary Industries is using it to track the spread of the freshwater golden clam that invaded the Waikato river.

But there is much more to eDNA than detecting a favourite (or least favourite) animal. The real shift is the ability to read eDNA barcodes across the “tree of life”.

‘Seeing’ entire ecosystems

Rather than focusing on just a few select indicator species, eDNA helps us to consider the ecosystem more holistically, such as the example below from the Waikato River, from a single litre of filtered water.

A graphic showing the tree of life. — An eDNA analysis of one litre of water from the Waikato River shows all the species detected. Wilderlab and Wai Tuwhera o Te Taiao, CC BY-SA

In a partnership between the eDNA company Wilderlab, the Department of Conservation, the Ministry for the Environment and regional councils, we harnessed this holistic ecosystem data to develop a new index to measure river health called the Taxon-Independent Community Index, or TICI.

Using regularly monitored river sites across Aotearoa New Zealand, we focused on 3,000 eDNA barcodes from bacteria, fungi, plants and animals that are indicators of river nutrification.

The TICI index is a score from 60 to 140, based on which of the 3,000 barcode signatures are present. Some barcodes push the dial in a positive direction, others nudge it negative.

Raw DNA data can be complex. The TICI index distils the genetic code into a metric that people can more easily engage with. From zero river samples profiled using eDNA in 2019, we now have more than 50,000 eDNA records, including 16,000 TICI scores. Collectively, this has generated one of the most powerful global eDNA datasets, and opens a number of new applications.

Teichelmann Creek in the predator-free Perth Valley (in South Westland) currently tops the leader board with a TICI score of 135.03 (pristine). At the other end of the table, Papanui Stream in the Hawke’s Bay generated a TICI of 68.05 (very poor).

An infographic that shows TICI scores across New Zealand. — This infographic shows TICI scores across New Zealand and how they change along a river’s length. Wilderlab, CC BY-SA

Where to next for eDNA?

We envisage that eDNA-based indicators, like the TICI index, will provide a practical way for people to track health in their local rivers.

Communities are already engaging with this tool through the Wai Tuwhera o te Taiao programme. Farmers are getting on board and eDNA techniques feature in the futures thinking of central government.

In a 2019 report on New Zealand’s environmental reporting system, the Parliamentary Commissioner for the Environment identified deficiencies and fragmentation in New Zealand’s environmental data gathering and reporting, including for freshwater. We argue that eDNA gets us a step closer to fixing some of these issues.

Using the eDNA toolkit it is within our technical (and budgetary) reach for regular monitor of all rivers in Aotearoa to help prioritise where, when and how much management (or restoration) is needed.

And there is more to come on the eDNA monitoring front, including methods of sampling eDNA from the air, household taps, shipping containers and around aquaculture facilities.

Michael Bunce has received funding from Australia & New Zealand on the use of eDNA technologies, including to work with community groups as part of the Wai Tuwhera o Te Taiao programme at the Environmental Protection Authority. He is currently Chief Science advisor at the Department of Conservation.

Simon Jarman currently works with eDNA Frontiers and Wilderlab, companies which offer fee-for-service eDNA services.

Read the full story here.

Photos courtesy of

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By I. Edwards HealthDay ReporterSATURDAY, April 19, 2025 (HealthDay News) — Three months after wildfires tore through Los Angeles, a new study...

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Allergy Alert: Paranoia in Our Immune System

From peanuts and pollen to cats and dust mites, allergy rates are soaring dramatically all over the globe, with inoffensive substances triggering life-threatening physical responses. Experts are predicting that by 2050, one in two will suffer from an allergy. Why are our immune systems overreacting in this way? To stem the tide of the epidemic, scientists are investigating the interface between genetics, environmental factors and our modern lifestyle, and developing revolutionary new approaches to prevention and treatment.

Science

Crisis

Health

Red Bean

An individual who is suffering from the obsessive-compulsive disorder and forced to migrate to outer space, he misses his mother and homeland. However, the only response to his calling his mother is an endless busy tone.

Cosmos

Health

Culture

Ground Operations: Battlefields to Farmfields

Combat veterans from the wars in Iraq & Afghanistan find a new mission and personal healing with new careers as organic farmers and ranchers.

Health

Agriculture

Government

STOPPING THE NEXT PANDEMIC

Stopping the next pandemic is a new challenge to the most prominent scientists. Their field studies around the world are showing that our health as humans depends on animal and environmental health. Diseases that occur in the remotest places are now our concern. We live in a connected world. We will have to preserve the environment to prevent future pandemics.

Health

Science

The Connection Between Bats and Coronavirus: Wildlife is not to blame

What exactly is the connection between bats and coronavirus? And how has sheltering-in-place disrupted field research in California and beyond? State and local governments have set restrictions on bat research and rescue in an effort to curtail the spread of the coronavirus. Dr. Winifred Frick, chief scientist of Bat Conservation International, describes how the new restrictions have affected conservation efforts.

Animals

Science

Health

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We need faster, better ways to monitor NZ’s declining river health – using environmental DNA can help

Rivers are full of life

‘Seeing’ entire ecosystems

Where to next for eDNA?

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Suggested Viewing

Allergy Alert: Paranoia in Our Immune System

Red Bean

Ground Operations: Battlefields to Farmfields

STOPPING THE NEXT PANDEMIC

The Connection Between Bats and Coronavirus: Wildlife is not to blame

Join us to forge
a sustainable future

sign up for our mailing list to stay informed on the latest films and environmental headlines.

Cookies help us run our site more efficiently.

We need faster, better ways to monitor NZ’s declining river health – using environmental DNA can help

Rivers are full of life

‘Seeing’ entire ecosystems

Where to next for eDNA?

Related News

Biden let California get creative with Medicaid spending. Trump is signaling that may end

Chattanooga Just Became North America's First National Park City. Here's What That Means

Despite progress, Los Angeles is nation's smoggiest city for 25th time in 26 years

Regulators are underestimating health impacts from air pollution: Study

Wildfire Survivors Still Struggle With Basic Needs and Support

Suggested Viewing

Allergy Alert: Paranoia in Our Immune System

Red Bean

Ground Operations: Battlefields to Farmfields

STOPPING THE NEXT PANDEMIC

The Connection Between Bats and Coronavirus: Wildlife is not to blame

Join us to forgea sustainable future

sign up for our mailing list to stay informed on the latest films and environmental headlines.

Join us to forge
a sustainable future