water pollution

My Eco-Journey with DuPont…                           

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In his 2006 book The Seven Basic Plots: Why We Write Stories, Christopher Booker tells us that there are seven types of plots in story. One is entitled “Overcoming the Monster,” an underdog story where the hero sets out to destroy an evil to restore safety to the land. It is a story I admire and never tire of. The evil force is typically much larger than the hero, who must find a way, often through great courage, strength, inventive cunning—and help from her community—to defeat the evil force. This is the story of David and Goliath, of Beowulf and Grendel, of Luke Skywalker and Darth Vader in Star Wars, of Jake Sully and Miles Quaritchs in Avatar—notice, all men who, for the most part, do their hero-ing alone. I may get to that later (in another post)…

The “Overcoming the Monster” plot, whether told literally or through metaphor, reflects an imbalance in the world—usually of power—that the hero must help right.

Enter the “Monster” DuPont…

DuPont Washington Works plant in Parkersburg, West Virginia

The true story of DuPont’s decades-long evil maleficence reflects the great power imbalance of many large corporations and the evil they enact through willful deception and mischief to increase profit, their god.

This brings me to my heroic journey. For in some terrible way, the story of DuPont is also my story. One of power imbalance, of deception and ignorance. Their deception; my ignorance:

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In 1954, the year I was born, during the ramp up for the Teflon rollout at DuPont’s Washington Works plant in Parkersburg, toxicologist R.A. Dickison noted possible toxicity of the surfactant C8 (PFOA or Perfluorooctanoic Acid) used to make Teflon. DuPont ignored the warning and proceeded to roll it out for mass use.

1950s DuPont ad for the Teflon “Happy Pan”

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In 1961, while I was contending with recess bullies in grade two, DuPont rolled out their Teflon-coated “Happy Pan” with the full knowledge that C8 was a toxic endocrine disruptor and caused cancer. DuPont’s chief toxicologist Dorothy Hood cautioned executives in a memo that the substance was toxic and should be “handled with extreme care.” She explained that a new study had found enlarged livers in rats and rabbits exposed to C8, confirming that the chemical was toxic. It didn’t stop the roll out.

In 1962, while I was exploring my artistic talents at school, DuPont scientists conducted tests on humans, asking a group of volunteers to smoke cigarettes laced with C8. Nine out of ten people in the highest-dosed group were noticeably ill for an average of nine hours with flu-like symptoms that included chills, backache, fever, and coughing. Further experiments by DuPont linked C8 exposure to the enlargement of rats’ testes, adrenal glands, and kidneys.

In 1964, I was ten years old and struggling with my Grade 5 teacher who was trying to curb my unique self-expression. I was already aware of environmental imbalance and destruction in the world. My pet peeve was littering because it demonstrated great disrespect for others and the environment. I told environmental stories. That year DuPont had already begun its great deception; having confirmed the toxicity of C8, they simply watched (and recorded) as this cancer-causing endocrine disruptor injured, maimed and killed their own workers. The company did nothing to prevent it and they told no one.

In 1965, I was in the process of figuring out my heroic self and my unique gift to the world in Grade seven: was it in fine arts and advertising? Writing and storytelling? Environmentalism and law? Internal DuPont memos revealed that preliminary studies showed even low doses of a related surfactant to Teflon could increase the size of rats’ livers, a classic response to poison.

In the mid- to late-60s, I became an environmental activist, putting up posters and writing in the school paper. I wrote letters to industry and politicians, trying to incite interest in being good corporate citizens and promoting global environmental action. I remember a well-meaning teacher chiding me for my extravagant worldview. “Stick to little things and your community—like recycling,” he suggested patronizingly. I remember the shock of realizing that not everyone felt the planet like I did. Perhaps it was a teenage-thing, or a girl-thing, or a nina-thing. I prayed it wasn’t just a nina-thing…

I started writing stories in high school. Mostly eco-fiction, though I didn’t know that’s what it was at the time. There was no genre called eco-fiction back then. It all went under the umbrella of scifi.

In 1969, at fifteen, I wrote my first dystopia, Caged in World.  The eco-novel was about a subway train driver and a data analyst caught in the trap of a huge lie. The story later morphed into Escape from Utopia. Several drafts and years later the novel became the eco-medical thriller Angel of Chaos, published in 2010. The story is set in 2095 as humanity struggles with Darwin’s Disease—a mysterious neurological environmental pandemic assaulting Icaria 5, an enclosed city within the slowly recovering toxic wasteland of North America. The city is run by deep ecologists who call themselves Gaians, and consider themselves guardians of the planet. The Gaians’ secret is that they are keeping humanity “inside” not to protect humanity from a toxic wasteland but to protect the environment from a toxic humanity.

Lawyer Robert Bilott (Mark Ruffalo) investigates leachate-infected cows from nearby DuPont landfill (photo from film “Dark Waters”)

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In the early 1970s, I entered university and contemplated becoming an environmental lawyer; I wrote short stories, mostly eco-fiction, and joined marches protesting environmental destruction by large corporations.  DuPont confirmed that C8 not only persisted in the environment; it bioaccumulated in animals. In 1979, when I graduated with a Master of Science degree in limnology/ecology, DuPont circulated an internal memo in which humans exposed to C8 were referred to as “receptors,” describing how scientists found “significantly higher incidence of allergic, endocrine and metabolic disorders” as well as “excess risk of developing liver disease.”  DuPont kept this knowledge to themselves and withheld it from EPA.  

In the late 1970s early ‘80s, while I was addressing local environmental issues as a practicing limnological consultant, DuPont was dumping 7,100 tons of PFOA-laced sludge into unlined ‘‘digestion ponds’’: open, unlined pits on the Washington Works property, from which the chemical could seep straight into the ground. PFOA entered the local water table, which supplied drinking water to the communities of Parkersburg, Vienna, Little Hocking and Lubeck — more than 100,000 people.

Effects of PFOA (birth defect in Bucky Bailey whose mother was on the Teflon line without protection during her first trimester; blackening teeth from the excessive fluoride, from scene in “Dark Waters”)

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In 1981, when I got my first job as a limnologist and environmental consultant in Vancouver, DuPont confirmed that C8 caused birth defects in its own workers—and did not warn its workers. A DuPont pathologist confirmed that the observed fetal eye defects were due to C8. With that confirmation the pregnancy study was quietly abandoned and a decision made not to inform EPA. Less than a year later DuPont created false data for EPA then moved women of childbearing age back into areas with C8 exposure. Many in the company coined the term “Teflon flu” to describe the ill-effects of working close to the compound. By 1982, DuPont had confirmed the high toxicity of C8/PFOA in humans.

In 1984, a year after I formed my own consulting company Limnology Services in Vancouver, DuPont staffers secretly tested their community’s drinking water and found it to contain alarming levels of C8. Deciding that any cleanup was likely to cost too much and tarnish their reputation, DuPont chose to do nothing. In fact, they scaled up their use of C8 in Teflon products and bought land to dump their toxic sludge in unlined landfills. Deaths in DuPont workers from leukemia and kidney cancer climbed.

In 1989, at 35 years old, and still blissfully unaware of DuPont’s nefarious activities, I continued consulting for my own company Limnology Services, addressing mostly local environment issues with communities and local governments. By that year, DuPont employees found an elevated number of leukemia deaths at the West Virginia plant, followed by an inordinately high number of kidney cancers among male workers. Earl Tennant, whose farm was close to the DuPont landfill at Dry Run creek, sent videos of foamy water and diseased cows to the West Virginia Department of Environmental Protection; state regulators documented “numerous deficiencies in the landfill operation and erosion gullies that funnelled waste into Dry Run creek; DuPont made a deal with the department: the company paid a $250,000 fine and the department took no further action against the landfill. (The official who negotiated the deal later became a DuPont consultant.)

Throughout the 90s, I started teaching college biology and university environmental education courses in Vancouver. The magazine Shared Vision Magazine published my first article “Environmental Citizenship” in 1995. Meantime, DuPont’s Washington Works plant pumped hundreds of thousands of pounds of PFOA sludge, powder and vapor through stacks into the atmosphere and outfall pipes into the Ohio River.

In 1996, I was consulting for local industry and municipalities. By then, C8 was in the drinking water of Parkersburg and other communities. Despite what they knew of C8’s toxicity, DuPont kept it a secret (no one else was testing for PFOA because it was unregulated).

Farmer Tennant and lawyer Rob Billot encounter a leachate-infected mad cow in the 2019 film “Dark Waters”

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In 1999, still serving as environmental consultant to mining and pulp mill companies, I still knew nothing about DuPont’s duplicitous environmental atrocities. 3M—troubled by its studies on C8 with monkeys—notified EPA and phased out PFOS and PFOA; DuPont started producing its own PFOA. On behalf of Earl Tennant whose cattle were dying adjacent to DuPont’s landfill site, lawyer Rob Bilott filed a small suit against DuPont to gain legal discovery and starting the decade-long process of finally unravelling the buried truth of their insidious criminality–over thirty years after DuPont knew and did nothing.

In 2003, I continued consulting as an environmental scientist in ignorance of DuPont’s misdealings, though by now much had come out in the press. By that year, DuPont had knowingly dispersed almost 2.5 million pounds of harmful C8 from its Washington Works plant into the air and water of the mid-Ohio River Valley area.

DuPont’s Washington Works plant in Parkersburg, West Virginia

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In 2004, DuPont agreed to settle the class-action suit filed by lawyer Rob Bilott. Under the terms of the settlement, the company was not obliged to pull C8 from the market. The best the EPA could negotiate was a voluntary phase-out by 2015. That same year There It Is reported on how DuPont denied poisoning consumers with Teflon products. The dangers and spread of PFOA and other forever chemicals appeared more and more in the scientific literature (see the reference list below, which is by no means exhaustive).

In 2007, Darwin’s Paradox, my eco-fiction novel about an environmental pandemic, was published by Dragon Moon Press in Calgary, Alberta. Four years earlier, the law had finally caught up to DuPont, but not before they had dispersed 2.5 million pounds of harmful C8 from their Washington Works plant into the air and water of the mid-Ohio River Valley area. It would be another twelve years before DuPont would stop making C8 (in 2015) and another four years after that when C8 would be banned from use globally (2019). PFOA is still unregulated by EPA; the best they can do is issue a non-enforceable health advisory set at 70 parts per trillion.

In 2012, shortly after I moved to Nova Scotia to write for a living (having quit environmental consulting due to disillusionment with integrity of companies I worked for), the C8 Science Panel, tasked to study the possible health effects of PFOA in a highly exposed population in the mid-Ohio Valley, determined a probable link between C8 exposure and six disease categories: kidney cancer, testicular cancer, ulcerative colitis, thyroid disease, preeclampsia, and high cholesterol.  

In 2015, two years after I began teaching writing at the University of Toronto, DuPont began a series of complex transactions that transferred its responsibility for environmental obligations and liabilities associated with PFAS (C8) onto other entities such as Chemours, Corteva, and NewDupont. A year later New York Times Magazine ran a story “The Lawyer Who Became DuPont’s Worst Nightmare” and Sharon Lerner of The Intercept ran an in-depth series on DuPont’s duplicitous criminality: “The Teflon Toxin: DuPont and the Chemistry of Deception.”

In 2017, DuPont and its spinoff company Chemours agreed to settle a lawsuit with roughly 3,500 people living near the Parkersburg plant in both West Virginia and Ohio and many ailing from toxicity-related problems. The company agreed to pay $671 million. That’s one day’s sales in a $27 billion annual profit stream. The Fayetteville Observer reported that this “Discontinued chemical [was] still in well water” after DuPont agreed in 2009 to stop using C8. They noted that the company was facing a class action lawsuit from thousands of people in Ohio and West Virginia for discharging the toxic chemical into the Ohio River since the 1950s.

In 2019—sixty-seven years after DuPont knew PFOA was toxic and did nothing—this forever chemical was finally banned globally under the Stockholm Convention. Unfortunately, by 2019, PFOA was already literally everywhere on the planet in concentrations considered unsafe. Given its high water-solubility, long-range transport potential, and lack of degradation in the environment, PFOA persists in groundwater and is ubiquitously present in oceans and other surface water around the globe. It is found in remote areas of the Arctic and Antarctic (where it was not used or manufactured), no doubt transported there through ocean currents and in the air, bound on particles. NBC News ran a news piece about ‘forever chemicals’ contaminating drinking water near military bases. The Guardian ran a news article: “Companies deny responsibility for toxic ‘forever chemicals.’” In Maine, The Portland Press Herald ran a story: “Households are awash in ‘forever chemicals’.”

In 2020, NBC News revealed that DuPont was still avoiding its responsibility to clean up its C8 mess and compensate those harmed by DuPont’s negligence.

In 2022, I finally learned about DuPont’s decades-long environmental dispersal of toxic PFOA (C8) and their criminal deception throughout this life time. I’d lived through DuPont’s entire six decades of deception in ignorance.

Poster for the 2019 film “Dark Waters” on DuPont’s criminal activities and the lawyer who exposed them

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In 2022, three years after its release, I chanced upon “Dark Waters,” the 2019 film starring Mark Ruffalo who plays lawyer Robert Bilott, the man who took DuPont to court in 2002. I found out seven years after DuPont was forced to stop using PFOA and a lifetime after they started their egregious pollution and deception in the 1950s. For over six decades, from when I was born to well into my sixties, DuPont executives chose to:

1. continue using toxic C8 despite its proven toxicity;
2. expose C8 to their own workers without telling them (and even testing their workers without telling them why);
3. dispose of C8 unsafely, releasing the toxin into the communities and the environment;
4. cover up and deny that they did, when they were caught in the act.

No one went to jail.

Below are the faces of the DuPont men and women who sanctioned–encouraged–the willful harm of other life. Despite knowing the danger posed by exposure to PFOAs to people, these DuPont CEOs chose to: 1) continue to poison the environment and people, 2) cover up their actions from authorities, and 3) fight the courts and regulators from doing the right thing when they were caught. No one went to jail. No one was fired. They just paid $$$ and shamefully kept going. These people are criminals. 

DuPont CEOs from 1950-2019 who sanctioned release of PFOA into the environment then covered it up: Crawford H. Greenewalt, Lammot Copeland, Charles B. McCoy, Edward G. Jefferson, Richard E. Heckert, Edgar S. Woolard, John A. Krol, Charles O. Holliday Jr., Ellen Kullman, Edward D. Breen

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It’s not over either; DuPont currently uses other PFAS compounds that are unregulated but whose toxicity is being found to be as potent. And, of course, these other ‘forever chemicals’ are finding themselves everywhere. I was ignorant of all this the whole time. Meantime, I am drinking DuPont’s forever chemicals, I am eating DuPont’s forever chemicals, and I am feeling DuPont’s forever chemicals falling on my face in the rain.

My hard lesson: Ignorance breeds complacency and hubris; both will lead to downfall.

To return to the “Overcoming the Monster” story plot and the monster archetype, I’m convinced that it isn’t the Darth Vaders or Miles Quaritchs we must overcome. Yes, they are monsters, but they serve a greater monster. For Vader it was Emperor Palpatine and for Quaritch it was the executives of the RDA Corporation. While Vader and Quaritch may be the face of evil, true evil lurks behind them, orchestrating, in the shadows. It is an evil we must fight internally, because each of us carries that potential evil inside us—in the urge to cheat on our taxes; in looking for the free ride (there are no free rides); in coveting what others have when what we have is enough; in embracing self-deception through unsubstantiated narratives and confabulation; and in choosing to remain ignorant to suit a short-sighted and self-serving agenda. I’m guilty too.

I hope some aspects of the hero that live in me, as with everyone, are helping to overcome the monster by writing about it in articles I share here and elsewhere and by presenting a different narrative—one of resistance and hope—through my fiction.

A recent example is the December 31, 2024 release of Through the Portal: Tales from a Hopeful Dystopia, published by Exile Editions and edited by Lynn Hutchinson Lee and me. The anthology features over thirty eco-fiction short stories, flash fiction, and poetry that celebrate the spirit of humanity in a changing world.

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In a post on The Meaning of Water, I list which CEO was on watch and responsible for each criminal atrocity enacted. The post also goes into more detail on the six decade history of DuPont’s criminal atrocities and great deception. For more detail on each decade of atrocity and deception, check out my posts by decade: 1950s, 1960s, 1970s, 1980s, 1990s, and 2000s. What follows into the present day is perhaps even more atrocious, given that all is supposedly out in the open. This predatory company continues to bribe officials, lie and deny, threaten the weak, and so much more.

p.s. To understand the nature of industrial duplicity of large corporations such as DuPont, I highly recommend reading the 2023 study by Nadia Gaber and colleagues in the Annals of Global Health. The authors evaluated previously secret industry documents on PFAS to understand the significant delayed disclosure of harm posed by PFAS: from its production in the 1940s, to suggestions of toxicity in the 1950s, to irrefutable knowledge of PFAS toxicity in the 1960s, and–due to lack of transparency and suppression of scientific findings–public knowledge of this only arising in the late 1990s (mainly because of legal suits and discovery).

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References:

Ahrens L. 2011. “Polyfluoroalkyl compounds in the aquatic environment: a review of their occurrence and fate.” J Environ Monit 13: 20–31. 10.1039/c0em00373e

Barton CA, Butler LE, Zarzecki CJ, Laherty JM. 2006. “Characterizing perfluorooctanoate in ambient air near the fence line of a manufacturing facility: comparing modeled and monitored values.” J Air Waste Manage Assoc 56: 48–55. 10.1080/10473289.2006.10464429

Barton CA, Kaiser MA, Russell MH. 2007. “Partitioning and removal of perfluorooctanoate during rain events: the importance of physical-chemical properties.” J Environ Monit 9: 839–846. 10.1039/b703510a

Busch J, Ahrens L, Xie Z, Sturm R, Ebinghaus R. 2010. “Polyfluoroalkyl compounds in the East Greenland Arctic Ocean.” J Environ Monit 12: 1242–1246. 10.1039/c002242j

Gaber, Nadia, Lisa Bero, and Tracey J. Woodruff. 2023. “The Devil they Knew: Chemical Documents Analysis of Industry Influenc on PFAS Science.” Ann Glob Health 89(1): 37.

McMurdo CJ, Ellis DA, Webster E, Butler J, Christensen RD, Reid LK. 2008. “Aerosol enrichment of the surfactant PFO and mediation of the water-air transport of gaseous PFOA.” Environ Sci Technol 42: 3969–3974. 10.1021/es7032026

Paustenbach, Dennis, Julie Panko, Paul K. Scott, and Kenneth M. Unice. 2007. “A Methodology for Estimating Human Exposure to Perfluorooctanoic Acid (PFOA): A Retrospective Exposure Assessment of a Community (1951-2003)” Journal of Toxicology and Environmental Health

Prevedouros K, Cousins IT, Buck RC, Korzeniowski SH. 2006. “Sources, fate and transport of perfluorocarboxylates” Environ Sci Technol 40: 32–44. 10.1021/es0512475

Velez, M.P., T.E. Arbuckle, W.D. Fraser. 2015. “Maternal exposure to perfluorinated chemicals and reduced fecundity: the MIREC study.” Human Reproduction 30(3): 701-9.

Vierke, Lena, Claudia Staude, Annegret Biegel-Engler, Wiebke Drost, and Christoph Schulte. 2012. “Perflurorooctanoic acid (PFOA)–main concerns and regulatory developments in Europe from an environmental point of view.” Environmental Sciences Europe 24: 16

Yamashita N, Kannan K, Taniyasu S, Horii Y, Petrick G, Gamo T. 2005. “A global survey of perfluorinated acids in oceans.” Mar Pollut Bull 51: 658–668. 10.1016/j.marpolbul.2005.04.026

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Nina Munteanu is a Canadian ecologist / limnologist and novelist. She is co-editor of Europa SF and currently teaches writing courses at George Brown College and the University of Toronto. Visit www.ninamunteanu.ca for the latest on her books. Nina’s bilingual “La natura dell’acqua / The Way of Water” was published by Mincione Edizioni in Rome. Her non-fiction book “Water Is…” by Pixl Press (Vancouver) was selected by Margaret Atwood in the New York Times ‘Year in Reading’ and was chosen as the 2017 Summer Read by Water Canada. Her novel “A Diary in the Age of Water” was released by Inanna Publications (Toronto) in June 2020.

H2O Publishes my Illustration of the Diatom Forest

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My original Diatom Forest illustration in my article “Diatom Spring” in The Meaning of Water

This past spring, Dutch scientist Herman van Dam (Consultancy for Water and Nature) approached me for permission to use my illustration of the diatom forest in a paper he and co-authors were preparing for the Dutch journal H2O. He explained that they wanted to help familiarize water managers who read the journal with the underwater biodiversity for which my illustration would be helpful.

The Illustration

He’d seen my illustration in my article “A Diatom Spring” in The Meaning of Water. Below is a summary of my article about the diatom forest:

Attachment and colonization starts with a ‘clean’ unpopulated surface (usually scoured by turbulence in a storm or some other event or a new surface tumbled into the water). Several stages of succession take place, starting with early colonizers. The adnate Cocconeis placentula, whose frustules attach directly to the substrate, is an example of an early colonizer. When they attach to a substrate they form a biofilm (think moss in a terrestrial forest). Adnate species are eventually overgrown by taxa that produce a mucilaginous pad (e.g. Synedra) or stalk (e.g. Gomphonema). The understory layer is typically occupied by diatoms such as Fragilaria vaucheriae and Synedra radians that attach to the surface at one end (apical) of their rod-shaped frustules using a mucilaginous pad to form “rosettes” that resemble spiky understory shrubs. This allows them to protrude above the adnate taxa and take advantage of more light.

SEM of Synedra radians and Fragilaria vaucheriae that form rosettes as they apically attach to substrate (image by Roemer et al., 1984)

The diatoms Cymbella and Gomphonema produce long stalks that attach directly to the surface, allowing them to form a swaying canopy over the lower tier of cells of Fragilaria vaucheriae, Synedra radians and early colonizer Cocconeis placentula whose frustules attach directly to the substrate (think overstory and understory of a terrestrial forest or a marine kelp forest).

The Diatom Forest Structure

Just like trees, the canopy-forming stalked diatoms effectively compete for available light and nutrients in the water with their vertical reach. They provide the ‘overstory’ of the diatom forest’s vertical stratification. These tree-like diatoms also provide an additional surface for other diatoms to colonize (e.g. tiny epiphytic Achnanthes settle on the long stalks of Cymbella, just as lichen does on a tree trunk).

SEM of three-week colony of Cymbella affinis (larger diatoms on left) and Gomphonema olivaceum attached via stalks (image from Roemer et al., 1984)

The stalked diatom forest acts like a net, trapping drifting-in euplankton, such as Pediastrum sp. andFragilaria spp., which then decide to stay and settle in with the periphyton community. The mucilage captures and binds detrital particles in both lower and upper stories of the diatom forest; these, in turn, provide nutrients for the diatom forest and additional surfaces for colonization. In their work with periphyton communities, Roemer et al. (1984) found several diatoms (e.g. Diatoma vulgare, Fragilaria spp. Stephanodiscus minutula) entangled in the complex network of cells, stalks, and detritus of the diatom forest’s upper story. They also found rosettes of Synedra radians—like jungle orchids—attached to large clumps of sediment caught by the net of mucilage.

Eventually, ‘overgrowth’ occurs as the periphyton colony matures and grows ‘top-heavy’ with all this networking. The upper story of the community simply sloughs off—usually triggered by turbulence in a river from rains, storms, or dam release. This is similar to a forest fire in the Boreal forest, which creates space and light for new colonization and growth. The dislodged periphyton ride the turbulent flow, temporarily becoming plankton, and those that survive the crashing waters provide “seed” to colonize substrates downstream. Others may get damaged and form the ‘dish soap’ like suds or foam you often see in turbulent water. The proteins, lignins and lipids of the diatoms (and other associated algae) act as surfactants or foaming agents that trap air and form bubbles that stick to each other through surface tension.

Diatoms, organics and associated detritus forms foamy ‘crema’ on the river (photo by Nina Munteanu)
Fragmented diatoms and organic material create a surface foam on the river (photo by Nina Munteanu)

The Paper

The paper was published June 13, 2024, in H2O, written by Jako van der Wal, Joep de Koning and Herman van Dam, and entitled “Snel inzicht in de ecologische waterkwaliteit met diatomeeën” (Quick insight into ecological water quality with diatoms). This paper was right up my alley! As a diatom specialist and limnologist who studied them in relation to environmental conditions and perturbations, I was intrigued by the paper and gained some additional insight on diatom ecology.

Van der Wal et al. cited recent advances in DNA-based identification methods that provide fast and cheap diatom identification over the traditional method of using an optical compound microscope to observe morphological characteristics such as size, shape and ornamentations of the silicified cell wall. I can attest that this is a labour-intensive process in which I spent many hours and days hunched over a microscope during my masters research at Concordia University. This efficient DNA-identification has seen a resurgence of using diatoms as a valuable tool for water quality managers, with applications providing insight into both current and historical water conditions. The authors argue that benthic diatoms or periphyton (living on substrates such as plants, rock, sand and artificial surfaces) have been since the 1980s used as indicators of saproby, trophy, acid and salt character in, among other things, ditches and canals. For every type of water and water quality, there are diatoms that have their habitat there, write the authors. They argue that, unlike phytoplankton, fish and macrofauna, periphyton attach to a surface and hardly move; this means that effects of water quality can be demonstrated locally. Because many diatom species tolerances and intolerances are known and they reproduce quickly (over days), diatoms respond quickly to changes in the environment—much faster (often within weeks) than other ecological indicators.

Scientists and water technicians can use diatom species composition to measure perturbations by organic material, low oxygen content, eutrophication, and toxicity. Given that diatoms colonize and develop quickly, this includes unstable and damaged habitats where other indicators cannot develop, such as shipping traffic, waves or where cleaning or dredging is carried out regularly. Historical insight can be provided by diatoms, given that their silica frustules are naturally preserved in sediment.

My Own Work with Turbulence

Periphyton biofilm (of mostly diatoms) on microscope slides left in a stream

During my masters research in several streams in the Eastern Townships, I examined how diatoms colonized artificial substrates; how they formed productive biofilms that sustained an entire periphyton community of attached aquatic life and discovered that their pattern of colonization related to current speed and direction. I submerged glass slides (the kind people use to look at critters under the microscope) in a device in the stream and oriented them parallel or perpendicular to the current.

There are two ways an algal community grows in a new area: (1) by initial colonization and settling; and (2) by reproduction and growth. I studied both by collecting slides exposed for differing lengths of time (collecting young and mature communities) in different seasons.

I discovered that the diatoms colonized these surfaces in weird ways based on micro-turbulence. Early colonizers, like Achnanthes and adnate Cocconeis preferred to settle on the edges of the slides, where the chaos of turbulence ruled over the sheer of laminar flow. They colonized by directly appressing to the substrate, making them the first photosynthetic taxa to establish a biofilm on a clean substrate. Vadeboncoeur and Katona (2022) write that “in waved-washed surfaces, these taxa may be the only algae that persist.” I postulated that the drift velocity was reduced on the slide’s edge, where turbulence was greatest, giving drifting algae a greater chance to collide and settle on the slide over the more shear laminar flow along the slide’s central face.

Once settled, the community was more likely to grow with turbulence. Greater turbulence decreases the diffusion gradient of materials around algal cells, with a higher rate of nutrient uptake and respiration. Turbulence provides greater opportunity to an existing colony by increasing “chaotic” flow, potential collision and exchange. Turbulence is a kind of “stable chaos” that enhances vigor, robustness and communication.

Using Diatoms in Water Quality Assessments

In their paper Van der Wal et al. argued that in environmental assessment the DNA-identification is just one step in a process that looks a population structure and health. Diatoms are already used in 21 of the 27 EU countries as part of a Water Framework Directive (WFD) quality index for flowing waters and in nine EU countries for standing water. Example conditions and associated perturbations where diatoms are a particularly useful indicator include: salinity, acidity, oxygen saturation, organic load (saproby), nutrient richness (trophy), temperature, and toxicity.

Diatom Growth Forms & Deformities

Van der Wal et al. argued that in addition to the different species compositions and the related ecological indices, growth forms and deformations of diatoms are useful indicators of water quality, particularly in relation to specific toxins.

My illustration adapted for the van der Wal et al. paper in H2O

Growth forms of diatoms can be described as attached, short-stalked, long-stalked, mobile and living in mucous tubes (Figure 3, van der Wal et al., 2024). Each growth form has advantages and disadvantages. For example, short-stalked diatoms are more difficult to graze and long-stalked diatoms come into contact with more water, from which they can then absorb substances. Long-stalked diatoms can also absorb more light if there is a lot of competition. Mobile diatoms can adapt to changing conditions by, for example, migrating from surface to subsurface and vice versa. Diatoms in slime tubes are more difficult to prey on and respond more slowly to environmental changes.

Two frustules of Navicula sp; the one on the right shows obvious deformities in the striations of its silica frustule (photo by van der Wal, H2O, June 13, 2024)

According to Van der Wal et al., scientistis (Rimet & Bouchez) noted that long-stalked diatoms declined in waterbodies subjected to various pesticides. Falasco et al. observed diatom deformities when exposed to various toxic substances. Heavy metals were observed to cause deformities in Navicula. Nitrogen toxicity was also implicated in diatom deformities.

Froth from diatoms and organics on the Otonabee river, ON (photo by Nina Munteanu)

References:

Falasco, E., Ector, L., Wetzel, C.E., Badino, G. & Bona, F. (2021). “Looking back, looking forward: a review of the new literature on diatom teratological forms (2010-2020).” Hydrobiologia 848: 1675-1753.

Munteanu, N. 2022. “When Diatoms Create a Forest.” https://themeaningofwater.com. December 18, 2022.

Munteanu, N. 2023. “When Diatoms Bloom in Spring.” https://themeaningofwater.com. May 14, 2023.

Munteanu, N. 2023. “A Diatom Spring.” https://themeaningofwater.com. April 16, 2023.

Munteanu, N. & E. J. Maly, 1981. The effect of current on the distribution of diatoms settling on submerged glass slides. Hydrobiologia 78: 273–282.

Munteanu, Nina. 2016. “Water Is…The Meaning of Water.” Pixl Press, Delta, BC. 584 pp.

Poikane, S., Kelly, M., & Cantonati, M. (2016). ‘Benthic algal assessment of ecological status in European lakes and rivers: challenges and opportunities’. Science of the Total Environment 568: 603-613. 

Rimet, F. & Bouchez, A. (2011). ‘Use of diatom life-forms and ecological guilds to assess pesticide contamination in rivers: Lotic mesocosm approaches’. Ecological Indicators 11: 489-499.

Roemer, Stephen C., Kyle D. Hoagland, and James R. Rosowski. 1984. “Development of a freshwater periphyton community as influenced by diatom mucilages.” Can. J. Bot. 62: 1799-1813. 

Serôdio, J. & Lavaud, J. (2020). “Diatoms and their ecological importance”. In: Leal Filho, W. et al. (eds). Life below water. Encyclopedia of the UN Sustainable Development Goals (pp.1-9). Springer Nature.

Smolar-Zvanut, Natasa and Matjaz Mikos. “The impact of flow regulation by hydropower dams on the periphyton community in the Soca River, Slovenia. Hydrological Sciences Journal 59 (5): 1032-1045.

Wal, J. van der, Joep de Koning and Herman van Dam. 2024. “Snel inzicht in de ecologische waterkwaliteit met diatomeeën”  H2O, 13 June, 2024.


Wood, Allison R. 2016. “Attached Algae as an Indicator of Water Quality: A Study of the Viability of Genomic Taxanomic Methods.” Honors Theses and Capstones. 306. University of New Hampshire Scholars’ Repository.

Zuilichem, H. van, Peeters, E. & Wal, J. van der (2016). “Diatomeeën als indicator voor waterkwaliteit nabij rwzi’s”. H2O-Online, 9 december 2016. https://edepot.wur.nl/401202 

Nina Munteanu is a Canadian ecologist / limnologist and novelist. She is co-editor of Europa SF and currently teaches writing courses at George Brown College and the University of Toronto. Visit www.ninamunteanu.ca for the latest on her books. Nina’s bilingual “La natura dell’acqua / The Way of Water” was published by Mincione Edizioni in Rome. Her non-fiction book “Water Is…” by Pixl Press(Vancouver) was selected by Margaret Atwood in the New York Times ‘Year in Reading’ and was chosen as the 2017 Summer Read by Water Canada. Her novel “A Diary in the Age of Water” was released by Inanna Publications (Toronto) in June 2020.