Atlantic Salmon Is All But Extinct as a Genetically Eroded Version of Farmed Salmon Has Taken Over

Atlantic salmon, the native salmon that used to inhabit the northern Atlantic Ocean, rivers and seas, is a species now represented by an impostor: farmed salmon. Also known as cultured salmon, farmed salmon comes from hatchery genetic stock and unlike its native ancestors, lacks wild genetic variation. The wild fish our ancestors ate is gone. What appears on our dinner plates is a substitute copy, a genetic dilution of a once mighty fish, the adaptive king of the sea and a significant food for coastal humans since prehistoric times.
The change in genetic stock has been happening for decades, as farmed salmon are released into native waters via restocking programs (in an attempt to reduce the negative impacts of overfishing of wild salmon) and also unintentionally as a consequence of faulty containment in sea net-cages. The resulting “swamping out" effect—farmed in, wild out—along with several other insidious factors, has driven native salmon to effective extinction.
Genetic Erosion
When I began to research the scientific literature on native Atlantic salmon, I was stunned to discover that this species (Salmo salar L.) is essentially extinct. How can this be possible? Is the fish before our eyes and on our platters not real? Yes, indeed it is, but the verified statistic is that 99.5 percent of all Atlantic salmon living today, whether farmed or fished from open ocean or rivers, is not what biologists call “wild type" and does not faithfully represent, in a genetic sense, the native fish that once broadly populated waters of our planet's Holarctic zone, the ecological region that encompasses the majority of habitats found across the Earth's northern continents.
The fish we eat today is not the fish that fed our ancestors or even the fish that fed our forebears of a century ago. Today's salmon, because of the effects of a force called genetic erosion, is the diluted copy of a fish that once thrived on a wild genome, that tried and true set of original genes which, in the case of salmon, generated a fish capable of magnetic field navigation, survival in fresh and salt water and geochemical detection of spawning micro-habitats.
Genetic erosion, simply defined as the loss of genetic diversity over time, eliminates the potential of a species to adapt to new environments and leads to extinction. The swamping-out effect by farmed salmon has been one eroding genetic force working against wild salmon. We human predators have overfished, toxically farmed, illiterately stocked, dammed and blindly released, by millions, farmed and unfit Atlantic salmon fishes into the wild. The hatchery stock has bred with and overrun the native species, one that had been evolving for hundreds of thousands of years and which is now genetically eliminated, all in the quick human feeding frenzy of the last century.
In visual terms, the force of this steep genetic erosion has clear cut to an industrial hedge and burned to the biological bones, a body of irreplaceable, adaptive genetic material equivalent to a massive, old-growth forest, one which had stood for millennia over the entire Holarctic region of Earth and which is frankly not restorable. One could say that the old-growth forest of Atlantic salmon is dead.
This is not an easy tale to tell. The salmon, however, is an able storyteller, being a familiar and marvelous fish. Salmon is anadromous, a migrant from fresh water to salty sea, a fish who returns to its birth river to spawn in the family niche for the next generation, for the continuation of each clan, the many clans for each population and the many populations for each species.
Technically, the only way to explain why the salmon you think you are eating is extinct is through the lens of population and molecular genetics. Yet, the salmon is truly a salmon of knowledge and can tell its story in many ways, being a once highly diverse and differentiated, smartly pedigreed family of kin and clan. If you can follow maps and glaciations, rivers and open seas, then you can follow the clans of salmon and their ancestral family trees and the recent loss of their protective, genetic canopy.
Salmonid Evolution
The earliest salmon came from a diverse group of ocean vertebrates known as the ray-finned fishes and was part of a broad divergence of ocean fishes that adapted over eons to the cold, northern waters of the upper Northern Hemisphere, around the Arctic Circle. Early Atlantic and Pacific salmonid ancestors branched into separate ocean groups of early species types about 600,000 years ago.
Well before the coming of its most evolved predator, Homo sapiens sapiens, before the industrial degradation of the earth's ecosystems, before and after the last retreat of the Last Glacial Maximum, salmon prospered, undisturbed and free to navigate the seas and inland rivers. The females raked their redds (spawning nests), the males attended, their black-eyed eggs developed. They grew into spotted fry, then young parr (juveniles) camouflaged in lines matured to silver-scaled adults, who when ready put out to sea to amass body weight as they navigated the ocean using the Earth's magnetic fields to guide them.
Consistently, the salmon returned upriver to breed again, homing back to their place of ancestry, their birth location, not only to pass down the best surviving, evolutionary genetic lines, but the unique adaptive differences of their clan, which allowed them to detect, recall and locate that singular family place as being their own. Innumerable salmon clans eventually earmarked to all of the available niches within the species' final broad biogeographical distribution.
On their way, during their travels, over time and in prehistory, salmon differentiated. Individuals of each clan began to accumulate small genetic differences by random chance, breeding and keeping those differences unto themselves and their families. Salmon clans became unique within their family's geographic niche because they spawned among their own. The clans grew and multiplied, each clan at its own location, spreading and creating more clans, larger and more diverse populations, accumulating more of those familial differences.
Clan-genetic differentiation can now be measured by DNA fingerprinting, has been shown to correlate to geographical breeding location and, most importantly, became locally adaptive. Salmon evolved to cull the identity by smell of their home waters in the elegant genetic processes of gene co-adaptation and where the salmon bred was where the salmon was most fit. Dynasties of ecological fitness, each clan best suited to its own specific breeding location, certainly emerged.
Surviving a Frozen World
We know that the ancient, wild Atlantic salmon faced and survived Holarctic glaciation, for their genes also left a fingerprint of their biological survival gear in their molecular patterns. Well studied in northern Europe, there likely existed one or more refugia under the Weichlesian glacial plates, bodies of fresh water in which the prehistoric salmon survived as the rest of its world froze over, unable to migrate to sea.
Isolated in its clans, separated by distance and geological formations, in different rivers, breeding with no outsiders and accumulating differences, the ever-adaptable wild salmon colonies were yet diverse enough to self-populate over long periods of time, being naturally fit and self-sustaining. Meanwhile, saltwater clans were successfully breeding in the ocean. As the glaciers remained, the separated salmon clans accumulated and passed on those unique fitness differences for best survival in their different environments.
Then the glacial ice retreated upon the warming Holocene, about 12,000 years ago. The oceans rose and fingered inland into fjords and rivers as glaciers melted and individuals from refuge salmon clans began to spread into fresh territory. Some pioneered the newly opened, post-glacial rivers, challenging distance and falls, spawning further upstream again and again, as the case may be, until all of the available rivers of the north Atlantic islands, eastern Russia, the Baltic Sea and their appurtenant inland flows were filled with unique, wild salmon, a literal natural spectrum of glorious natural diversity.
In the lands abutting the northeastern Atlantic Ocean, this distribution and range included every river in and out of the sea coasts from the north of Spain to the Arctic latitudes and in North America from the Connecticut River northward. Here lived and bred the “wild type" Atlantic salmon, adaptive king of the sea and the “leaper," the muscled fish of power, grace and fortitude. Meanwhile, our own species experienced an upturn during the advent of agriculture, about 10,000 years ago and spread around the globe. As far as the wild salmon was concerned, all was kept in checks and balances until our epoch of genetic erosion, the superseding Anthropocene, which began c. 1950. Ours is an historic epoch physically characterized by the plastic geological layer now forming as a permanent record in the crust of human industrial ways.
Today's Salmon
The salmon has taken a fatal series of genetic blows. Its “old growth forest" was set on fire by a human feeding frenzy that began with overfishing and was fed by industrial aquaculture. The genetic erosion is shocking and steep.
Today, 99.5 percent of all native Atlantic salmon has disappeared from the wild. In Europe, Scandinavia and around the Baltic Sea, native indigenous salmon has vanished from the Russian rivers Neva and Narva, the Luleälven and Umeälven of Sweden, from the Odra and Wisla in Poland and the Vilia of Belarus. In fact, only 10 of the many rivers which empty into the Baltic arm of the northern Atlantic Ocean sustain wild salmon populations any longer and the wild Baltic salmon genome is the only one with natural resistance to the destructive Gyrodactulus salaris parasite.
Around the British Isles, in Ireland and across the pond to North America, wild salmon populations are extinct or endangered or threatened. The Kola Peninsula of Russia is known to be a current refuge for wild type Atlantic salmon, yet is also known to harbor military and radioactive waste at ecologically harmful levels. The grand Torneälven of Sweden, called Tornionjoki where it traverses Finland, is one of the last rivers to host wild Atlantic salmon in the world. (For more on the status of Atlantic salmon, see the International Union for Conservation of Nature Red List map. Researchers at the Swedish Agency for Marine and Water Management have produced a report on the Baltic extinctions. Anna Tonteri, a conservation geneticist at the University of Turku in Finland has written an excellent doctoral thesis about the population genetics of north European Atlantic salmon).
The Baltic salmon extinctions were largely enabled by human destruction of migration routes for spawning, upon the building and operation of hydroelectric dams. Further molecular DNA studies of the hatchery stock salmon from this exemplary sea have demonstrated a genetic “homogenization." Stock salmon populations constitute more of a weak puree than a chunky soup, in terms of “population genetic structure," another statistical measure of diversity. This is why—although the map above may demonstrate a wide range and lesser areas of extinction—the actual number of wild salmon living within the extant areas is quite small at around 0.5 percent. In other words, the orange areas showing extant salmon are overall 99.5 percent inhabited by farmed stock salmon.
We have learned to overlay DNA diversity upon geography and geologic history, in a relatively new field called landscape genomics. The important data is not just in the map or the numbers of fish, but in the genetic quality and the relationships of the individual salmon that comprise the families, clans and populations. An apparent abundance by numbers does not mean a population is healthy, self-sustaining and diverse.
In Ireland, the release of farmed salmon has not only caused genetic erosion, but has disrupted the capacity of wild populations to adapt to warmer waters. This is a problem for salmon across its geographical range for the obvious reason of climate change. Strong and well founded recommendations for saving the remaining wild salmon include cessation of stock salmon releases and re-establishment of native spawning grounds. The future effects of warming waters, however, are unknown and not hopeful.
I can tell you a similar story about the Pacific salmon, the Oncorhynchusspecies—the chum, coho, sockeye and Chinook salmon—which are also extinct or endangered or threatened and which are also genetically eroded. The destruction of the 10-million-a-year run of wild salmon on the Columbia River is unfortunately historic. The Pacific salmon had populated its portion of the Holarctic range simultaneously with the Atlantic salmon. Recent research has verified that Pacific hatchery stock salmon differs genetically from wild salmon and does so from the first generation of breeding. More than 700 genes, according to the data, were associated with “wound healing, immunity and metabolism." (Scientists at Oregon State University recently conducted a study published in the journal Nature that shows there is DNA evidence that salmon hatcheries cause significant and rapid genetic changes). The fish are raised in overcrowded, concrete tanks, eat an artificial, supplemented diet and live in polluted water that is released into the environment whether farmed inland or off coast.
Genetic variation is the key to survival. With variation, if the environment changes, those individuals with the right variation in their genes will be most able to survive, to adapt and to regenerate a population. That is why it is important to sustain a lot of different, varied individuals in the population, in the clan, in the tribe. Genetic diversity for living organisms is the biological foundation for long term survival, for adaptation to environmental changes and is essential to species for sustaining fit populations for future generations. Genetic diversity is essential for all life on earth to survive climate changes.
The old-growth forest of Atlantic salmon was the entire set of all native salmon genes required for response and adaptation to new environments, the genetic set encompassing all salmon diversity, before the beginning of overfishing and the industrial era of H. sapiens sapiens. This forest of genetic diversity stood, so to speak, in wild swimming, individual, native salmon genomes (not laboratories!) and was acquired over millennia of biological and environmental changes by natural selection. The old-growth forest contained the wild genes of each fish, a reliable molecular network, co-adapted, set like jewels in a biological filigree, fitness genes in a pedigree of clans that salmon had naturally conserved among themselves, to sustain themselves and to protect their own kind from and for environmental changes and to adapt, to diverge and to explore new places in their niches of the living ecosystem of our planet. The old-growth forest was everything genetically needed for wild salmon survival.
Stock salmon cannot survive without human intervention. The overcrowded hatchery conditions in which it grows cause numerous fish body abnormalities and require nutritional supplementation to cover for shortfalls in bone development and other physiological problems.
Protect Whatever Remains
Human cultures rose around the salmon, which has fed and continues to feed a lot of people. In the wild, its orange flesh color comes from its consumption of shrimp and krill and the absorption of these carotenoids into its tissues. These natural pigments may actually have a protective effect for the salmon, as well as nutritional value for its consumers, humans and bears alike. Pellet-fed, farmed salmon must be supplemented to obtain its pink color.
Native, indigenous, wild Atlantic salmon, its distinguished clans and tribes, did not need human help to survive and yet we have lost the salmon to our anthropogenic ways, to overfishing, fish farming, dam construction, inbreeding, poor stock management and environmental degradation. And from these genetically eroded hills has been created a hatchery-dependent, diluted salmon, an inflexible, non-diverse and certainly not wild, genetic copy of salmon that we fish, farm, release and eat and even feed to our pets every day.
More than 99 percent of Atlantic salmon, Salmo salar L., live only as genetically eroded, hatchery stock fish today. That is a most sobering statistic considering the engineering of the Pacific Chinook salmon growth hormone into the Atlantic salmon genome (see my earlier article here). Whatever remnants still exist of our wild salmon populations must be protected without exception, especially given the potential introduction of a new, genetically engineered salmon to our frankly fragile food web.
Moreover, the pollution and operation of inland fish tanks is costly. At this point in the Anthropocene, conservation interests may want to rise up another step against the introduction of industrialized, non-native food species (call them what you will) into the only biosphere we have in which to live, until we are able to halt any further species genetic erosion. Salmon has been swimming upstream against the depleting force of “genetic erosion" for at least a century, a force that has claimed its wild genome, its clans and its tribes, its genetic diversity and which has nearly eliminated a once self-sustaining, powerful ocean species. Now, salmon cannot live without us.
Atlantic salmon is essentially extinct because we have demanded too much of this natural resource through over-consumption and environmental exploitation. The wild gene forest that once lived, the old trees, the towering antiquarians of genetic variation, are gone, lost in the fire of a rapid, wholesale, industrial Homo sapiens taking, consumed in an anthropocentric fire we could even see burning, when one looks at the timeline of scientific data.
Ask a Scientist: What Should the Biden Administration and Congress Do to Address the Climate Crisis?
By Elliott Negin
What a difference an election makes. Thanks to the Biden-Harris victory in November, the next administration is poised to make a 180-degree turn to again address the climate crisis.
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EcoWatch Daily Newsletter
By Suresh Dhaniyala and Byron Erath
A fast-spreading variant of the coronavirus that causes COVID-19 has been found in at least 10 states, and people are wondering: How do I protect myself now?
Airborne Particles Are Still the Biggest Problem
<p>The <a href="https://theconversation.com/why-it-matters-that-the-coronavirus-is-changing-and-what-this-means-for-vaccine-effectiveness-152383" target="_blank" rel="noopener noreferrer">SARS-CoV-2 variants</a> are believed to spread primarily through the air rather than on surfaces.</p><p>When someone with the coronavirus in their respiratory tract coughs, talks, sings or even just breathes, infectious respiratory droplets can be expelled into the air. These droplets are tiny, predominantly in the range of <a href="https://www.sciencedirect.com/science/article/pii/S0021850211001200?casa_token=KtyrsEfbeqcAAAAA:vv10sSxm33tzg0EQvNMIFtV7GCu5gE9QAzuyzHKr2_4Cl0OFkUJoGwzn4d0ZnEWS19NsOTuH" target="_blank" rel="noopener noreferrer">1-100 micrometers</a>. For comparison, a human hair is about 70 micrometers in diameter.</p><p>The larger droplets fall to the ground quickly, rarely traveling farther than 6 feet from the source. The bigger problem for disease transmission is the tiniest droplets – those less than 10 micrometers in diameter – which can remain suspended in the air as aerosols for <a href="https://academic.oup.com/cid/article/50/5/693/325466" target="_blank">hours at a time</a>.</p><span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="bb67b83dcafe589f350daf3df60fa29d"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/UNCNM7AZPFg?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span>
Daily case reports and 7-day rolling average as of Jan. 16, 2021.Chart: The Conversation, CC-BY-ND Source: COVID Tracking Project Get the data
What Can You Do to Stay Safe?
<p>1) Pay attention to the type of face mask you use, and how it fits.</p><p>Most off-the-shelf face coverings are not 100% effective at preventing droplet emission. With the new variant spreading more easily and likely infectious at lower concentrations, it's important to select coverings with materials that are most effective at stopping droplet spread.</p><p>When available, N95 and surgical masks consistently perform the best. Otherwise, face coverings that use <a href="https://www.sciencedirect.com/science/article/pii/S2352431620301802?casa_token=-Dj6nGBAm24AAAAA:qq9BpbzCKaPDFcV73ohA2fCnhE_Zlkss6Bei3kUwq9QYndhHj0Vafbbd-ef_855lx6knDfUt" target="_blank">multiple layers of material</a> are preferable. Ideally, the material should be a tight weave. High thread count cotton sheets are an example. Proper fit is also crucial, as gaps around the nose and mouth can <a href="https://pubs.acs.org/doi/10.1021/acsnano.0c03252" target="_blank" rel="noopener noreferrer">decrease the effectiveness by 50%</a>.</p><p>2) Follow social distancing guidelines.</p><p>While the current social distancing guidelines are not perfect – <a href="https://theconversation.com/what-a-smoky-bar-can-teach-us-about-the-6-foot-rule-during-the-covid-19-pandemic-145517" target="_blank" rel="noopener noreferrer">6 feet isn't always enough</a> – they do offer a useful starting point. Because aerosol concentrations levels and infectivity are highest in the space immediately surrounding anyone with the virus, increasing physical distancing can help reduce risk. Remember that people are infectious <a href="https://medical.mit.edu/faqs/COVID-19#faq-10" target="_blank" rel="noopener noreferrer">before they start showing symptoms</a>, and they many never show symptoms, so don't count on seeing signs of illness.</p><p>3) Think carefully about the environment when entering an enclosed area, both the ventilation and how people interact.</p><p>Limiting the size of gatherings helps reduce the potential for exposure. Controlling indoor environments in other ways can also be a highly effective strategy for reducing risk. This includes <a href="https://theconversation.com/what-a-smoky-bar-can-teach-us-about-the-6-foot-rule-during-the-covid-19-pandemic-145517" target="_blank" rel="noopener noreferrer">increasing ventilation rates</a> to bring in <a href="https://theconversation.com/keeping-indoor-air-clean-can-reduce-the-chance-of-spreading-coronavirus-149512" target="_blank" rel="noopener noreferrer">fresh air and filtering existing air</a> to dilute aerosol concentrations.</p><p>On a personal level, it is helpful to pay attention to the types of interactions that are taking place. For example, many individuals shouting can create a higher risk than one individual speaking. In all cases, it's important to minimize the amount of time spent indoors with others.</p><p>The CDC has warned that B.1.1.7 could <a href="https://www.cdc.gov/mmwr/volumes/70/wr/mm7003e2.htm?s_cid=mm7003e2_w" target="_blank" rel="noopener noreferrer">become the dominant SARS-CoV-2 variant</a> in the U.S. by March. Other fast-spreading variants have also been found in <a href="https://virological.org/t/genomic-characterisation-of-an-emergent-sars-cov-2-lineage-in-manaus-preliminary-findings/586" target="_blank" rel="noopener noreferrer">Brazil</a> and <a href="https://www.who.int/csr/don/31-december-2020-sars-cov2-variants/en/" target="_blank" rel="noopener noreferrer">South Africa</a>. Increased vigilance and complying with health guidelines should continue to be of highest priority.</p>- FDA Approves First In-Home Test for Coronavirus - EcoWatch ›
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Trending
By Tara Lohan
A key part of the United States' clean energy transition has started to take shape, but you may need to squint to see it. About 2,000 wind turbines could be built far offshore, in federal waters off the Atlantic Coast, in the next 10 years. And more are expected.
Threats to Birds
<p>One of the gravest threats facing birds is climate change, according to Audubon, which found that rising temperatures threaten <a href="https://www.audubon.org/2019climateissue" target="_blank" rel="noopener noreferrer">nearly two-thirds of North America's bird species</a>. That's why the impending development of offshore wind is a good thing, says Shilo Felton, a field manager in the organization's Clean Energy Initiative, but it also comes with dangers to birds that need to be better studied and mitigated.</p><p>The most obvious risk comes from birds colliding with spinning turbine blades. But offshore wind developments can also displace birds from foraging or roost sites, as well as migratory pathways.</p><p>Along the Atlantic Coast four imperiled species are of top concern to conservationists: the endangered piping plover, red knot, roseate tern and black-capped petrel, which is being considered for listing under the Endangered Species Act.</p><p>"Those four species are of utmost importance to make sure that we understand the impacts," says Felton. "But beyond that there are many species that are protected under the Migratory Bird Treaty Act and the Fish and Wildlife Conservation Act that could potentially see more impacts from offshore wind."</p><p>Northern gannets, for example, are at risk not just for collision but <a href="https://www.researchgate.net/publication/308703197_Possible_impacts_of_offshore_wind_farms_on_seabirds_a_pilot_study_in_Northern_Gannets_in_the_southern_North_Sea" target="_blank">habitat displacement</a>.</p>A northern gannet flying along Cape May, N.J. Ann Marie Morrison / CC BY-NC-ND 2.0
<p>"There's <a href="https://www.sciencedirect.com/science/article/abs/pii/S0006320716303196" target="_blank">some evidence</a> that they just won't use areas where turbines are, but that also excludes them from key foraging areas," says Felton. Researchers are still studying what this may mean for the birds. But a <a href="https://www.sciencedirect.com/science/article/pii/S0141113620305304" target="_blank">study</a> published in December 2020 conducted at Bass Rock, Scotland — home to the world's largest northern gannet colony — found that wind developments could reduce their growth rate, though not enough to cause a population decline.</p><p>Other birds, such as great cormorants and European shags, are <a href="https://www.sciencedirect.com/science/article/abs/pii/S0006320716303196" target="_blank">attracted to wind developments</a> and use the infrastructure to rest while opening up new foraging areas farther from shore.</p><p>"There's plenty of potential for a bird to use a wind farm and still to avoid the turbines themselves," says Felton.</p><p>Birds like pelicans, however, are less versatile in their movements and are at particular risk of collision because of their flight pattern, she says.</p><p>But how disruptive or dangerous offshore turbines will be along the East Coast isn't yet known.</p><p>Federal and state agencies, along with nongovernmental organizations, says Felton, have done good research to try to better understand those potential impacts. "But these are all theoretical, because we don't have a lot of offshore wind yet in the United States."</p>Threats to Ocean Life
<p>Birds aren't the only wildlife of concern. More development in ocean waters could affect a litany of marine species, some of which are already facing other pressures from overfishing, pollution, habitat destruction and climate change.</p><p>Scientists have found that marine mammals like whales and dolphins could be disturbed by the jarring sounds of construction, especially if pile driving is used to hammer the steel turbine platform into the seafloor.</p><p>The noises, though short-lived, could impede communication between animals, divert them from migration routes or cause them to seek less suitable areas for feeding or breeding. Research from Europe found that harbor porpoises, seals and dolphins may avoid development areas during construction. In most, but <a href="https://iopscience.iop.org/article/10.1088/1748-9326/7/4/045101" target="_blank">not all cases</a>, the animals were believed to have returned to the area following construction.</p><p>The biggest concern for conservation groups in the United States is the critically endangered North American right whale. There are fewer than 400 remaining, and the species' habitat overlaps with a number of planned wind development areas along the East Coast.</p><p>"Offshore wind is in no way the cause of the challenges the whales face, but it's going to be another pressure point," says John Rogers, senior energy analyst for the Union of Concerned Scientists.</p><p>Researchers aren't sure how right whales will respond to the noise from pile driving.</p><p>"But we are concerned, based on what we know about how whales react to other noise sources, that they may avoid [wind development] areas," says Kershaw.</p><p>And if that displacement causes them to miss out on important food resources, it could be dangerous for a species already on the brink.</p><p>There are a few other potential threats, too.</p><p>Ships associated with the development — more plentiful during construction — also pose a danger. In the past few years cargo ships, fishing boats and other vessels have caused half of all deaths of North Atlantic right whales.</p>A juvenile right whale breaches against the backdrop of a ship near the St. Johns River entrance. Florida Fish and Wildlife Conservation Commission / NOAA Research Permit #775-1600-10
<p>And after construction, the noise from the spinning turbines will be present in the water at low decibels. "We don't quite know how the great whales will react to those sounds," says Jeremy Firestone, the director of the Center for Research in Wind at the University of Delaware.</p><p>Other marine mammals may also perceive the noise, but at low decibels it's unlikely to be an impediment, <a href="http://www.int-res.com/abstracts/meps/v309/p279-295/" target="_blank">research has found</a>.</p><p>And it's possible that wind development could help some ocean life. Turbine foundations can attract fish and invertebrates for whom hard substrates create habitat complexity — known as the "reef effect," according to researchers from the University of Rhode Island's <a href="https://dosits.org/animals/effects-of-sound/anthropogenic-sources/wind-turbine/" target="_blank" rel="noopener noreferrer">Discovery of Sound in the Sea</a> program. Exclusion of commercial fishing nearby may also help shelter fish and protect marine mammals from entanglements in fishing gear.</p>Ensuring Safe Development
<p>Despite the potential dangers, researchers have gathered a few best practices to help diminish and possibly eliminate some risks.</p><p>When it comes to ship strikes, the easiest thing is to slow boats down, mandating a speed of <a href="https://biologicaldiversity.org/w/news/press-releases/vessel-speed-limits-sought-protect-endangered-north-atlantic-right-whales-2020-08-06/" target="_blank">10 knots</a> in wind development areas, and using visual and acoustic monitoring for whales.</p><p>Adjusting operations to reduce boat trips between the shore and the wind development will also help. A new series of service operating vessels can allow maintenance staff to spent multiple days onsite, says Kershaw, cutting down on boat traffic.</p><p>For construction noise concerns, developers can avoid pile driving during times of the year when whales are present. And, depending on the marine environment, developers could use "quiet foundations" that don't require pile driving. These include gravity-based or suction caisson platforms.</p><p>Floating turbines are also used in deep water, where they're effectively anchored in place — although that poses its own potential danger. "We have concerns that marine debris could potentially become entangled around the mooring cables of the floating arrays and pose a secondarily entanglement risk to some species," says Felton, who thinks more research should be conducted before those become operational in U.S. waters — a process that's already underway in Maine, where a <a href="https://composites.umaine.edu/2020/08/05/diamond-offshore-wind-rwe-renewables-join-the-university-of-maine-to-lead-development-of-maine-floating-offshore-wind-demonstration-project/" target="_blank" rel="noopener noreferrer">demonstration project is being built</a>.</p><p>If loud noises are unavoidable during construction, noise-reducing technologies such as bubble curtains can help dampen the sound. And scheduling adjacent projects to conduct similar work at the same time could limit the duration of disturbances.</p>The foundation installation of the off shore wind farm Sandbank using a bubble curtain. Vattenfall / Ulrich Wirrwa / CC BY-NC-ND 2.0
<p>Once turbines become operational, reducing the amount of light on wind platforms or using flashing lights could help deter some seabirds, NRDC <a href="https://www.nrdc.org/sites/default/files/harnessing-wind-advance-wind-power-offshore-ib.pdf" target="_blank" rel="noopener noreferrer">researchers reported</a>. And scientists are exploring using ultrasonic noises and ultraviolet lighting to keep bats away. "Feathering," or shutting down the turbine blades during key migration times, could also help prevent fatalities.</p><p>"We need to make sure that offshore wind is the best steward it can be of the marine ecosystem, because we want and expect it to be a significant part of the clean energy picture in some parts of the country," says Rogers. "We also have to recognize that we're going to learn by doing, and that some of these things we're going to figure out best once we have more turbines in the water."</p><p>That's why environmental groups say it's important to establish baseline information on species before projects begin, and then require developers to conduct monitoring during construction and for years after projects are operational.</p><p>Employing an "adaptive management framework" will ensure that developers can adjust their management practices as they go when new information becomes available, and that those best practices are incorporated into the requirements for future projects.</p>Putting Research Into Action
<p>Advancing these conversations at the federal level during the Trump administration, though, has been slow going.</p><p>"We didn't really have any productive discussions with the administration in the last four years," says Kershaw.</p><p>And when it comes to birds, Felton says the Bureau of Ocean Energy Management's recently completed "draft cumulative environmental impact statement" covering offshore wind developments had a lot of good environmental research, but little focus on birds.</p><p>"Part of that comes from the current administration's interpretation of the Migratory Bird Treaty Act," she says.</p><p>President Trump has been hostile to both wind energy <em>and</em> birds, <a href="https://www.nytimes.com/2021/01/05/climate/trump-migratory-bird-protections.html" target="_blank">and finished gutting the Migratory Bird Treaty Act</a> in his administration's the final days, removing penalties for companies whose operations kill migratory birds.</p><p>There's hope that the Biden administration will take a different approach. But where the federal government has been lacking lately, Kershaw says, they've seen states step up.</p><p>New York, for example, has established an <a href="https://www.nyetwg.com/" target="_blank" rel="noopener noreferrer">Environmental Technical Working Group</a> composed of stakeholders to advise on environmentally responsible development of offshore wind.</p><p>The group is led by the New York State Energy Research and Development Authority, but it isn't limited to the Empire State. It's regional in focus and includes representatives from wind developers with leases between Massachusetts and North Carolina; state agencies from Massachusetts to Virginia; federal agencies; and science-based environmental NGOs.</p><p>New York's latest solicitation for clean energy projects includes up to 2,500 megawatts of offshore wind and <a href="https://www.nyetwg.com/announcements" target="_blank" rel="noopener noreferrer">requires developers</a> to contribute at least $10,000 per megawatt for regional monitoring of fisheries and other wildlife.</p><p>Environmental groups have also worked directly with developers, including an agreement with Vineyard Wind — an 800-megawatt project off the Massachusetts coast that could be the first utility-scale wind development in federal waters — to help protect North Atlantic right whales.</p><p>The agreement includes no pile driving from Jan. 1 to April 30, ceasing activities at other times when whales are visually or acoustically identified in the area, speed restrictions on vessels, and the use of noise reduction technology, such as a bubble curtain during pile driving.</p><p>"The developers signed the agreement with us, and then they incorporated, most, if not all of those measures into the federal permitting documents," says Kershaw. "The developers really did a lot of bottom up work to make sure that they were being very protective of right whales."</p><p>Environmental groups are in talks with other developers on agreements too, but Felton wants to see best practices being mandated at the federal level.</p><p>"It's the sort of a role that should be being played by the federal government, and without that it makes the permitting and regulation process less stable and less transparent," she says." And that in turn slows down the build out of projects, which is also bad for birds because it doesn't help us address and mitigate for climate change."</p><p>Kershaw agrees there's a lot more work to be done, especially at the federal level, but thinks we're moving in the right direction.</p><p>"I think the work that's been done so far in the United States has really laid the groundwork for advancing this in the right way and in a way that's protective of species and the environment," she says. "At the same time, it's important that offshore wind does advance quickly. We really need it to help us combat the worst effects of climate change."</p><p><em><a href="https://therevelator.org/author/taralohan/" target="_blank" rel="noopener noreferrer">Tara Lohan</a> is deputy editor of The Revelator and has worked for more than a decade as a digital editor and environmental journalist focused on the intersections of energy, water and climate. Her work has been published by The Nation, American Prospect, High Country News, Grist, Pacific Standard and others. She is the editor of two books on the global water crisis.</em></p><p><em style="">Reposted with permission from <a href="https://therevelator.org/offshore-wind-wildlife" target="_blank" style="">The Revelator</a>. </em></p>- U.S. Offshore Wind Power Blown on Course - EcoWatch ›
- How Renewable Energy Could Power Your State - EcoWatch ›
Cities Can Help Migrating Birds on Their Way By Planting More Trees and Turning Lights Off at Night
By Frank La Sorte and Kyle Horton
Millions of birds travel between their breeding and wintering grounds during spring and autumn migration, creating one of the greatest spectacles of the natural world. These journeys often span incredible distances. For example, the Blackpoll warbler, which weighs less than half an ounce, may travel up to 1,500 miles between its nesting grounds in Canada and its wintering grounds in the Caribbean and South America.
Blackpoll warbler abundance in breeding, non-breeding and migration seasons. Cornell Lab of Ornithology / CC BY-ND
<p>For many species, these journeys take place at night, when skies typically are calmer and predators are less active. Scientists do not have a good understanding yet of how birds navigate effectively at night over long distances.</p><p><span></span>We study bird migration and how it is being affected by factors ranging from <a href="https://scholar.google.com/citations?user=S04C3UMAAAAJ&hl=en" target="_blank">climate change</a> to <a href="https://scholar.google.com/citations?user=pPk38-8AAAAJ&hl=en" target="_blank">artificial light at night</a>. In a recent study, we used millions of bird observations by citizen scientists to document the <a href="https://doi.org/10.1016/j.envpol.2020.116085" target="_blank">occurrence of migratory bird species in 333 U.S. cities</a> during the winter, spring, summer and autumn.</p>Blackpoll warbler. PJTurgeon / Wikipedia
<p>We used this information to determine how the number of migratory bird species varies based on each city's level of <a href="https://www.britannica.com/science/light-pollution" target="_blank" rel="noopener noreferrer">light pollution</a> – brightening of the night sky caused by artificial light sources, such as buildings and streetlights. We also explored how species numbers vary based on the quantity of tree canopy cover and impervious surface, such as concrete and asphalt, within each city. Our findings show that cities can help migrating birds by planting more trees and reducing light pollution, especially during spring and autumn migration.</p>Declining Bird Populations
<p>Urban areas contain numerous dangers for migratory birds. The biggest threat is the risk of <a href="https://doi.org/10.1650/CONDOR-13-090.1" target="_blank">colliding with buildings or communication towers</a>. Many migratory bird populations have <a href="http://dx.doi.org/10.1126/science.aaw1313" target="_blank">declined over the past 50 years</a>, and it is possible that light pollution from cities is contributing to these losses.</p><p>Scientists widely agree that light pollution can <a href="https://doi.org/10.1073/pnas.1708574114" target="_blank">severely disorient migratory birds</a> and make it hard for them to navigate. Studies have shown that birds will cluster around brightly lit structures, much like insects flying around a porch light at night. Cities are the <a href="https://doi.org/10.1002/fee.2029" target="_blank" rel="noopener noreferrer">primary source of light pollution for migratory birds</a>, and these species tend to be more abundant within cities <a href="https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.13792" target="_blank" rel="noopener noreferrer">during migration</a>, especially in <a href="https://doi.org/10.1016/j.landurbplan.2020.103892" target="_blank" rel="noopener noreferrer">city parks</a>.</p>Composite image of the continental U.S. at night from satellite photos. NASA Earth Observatory images by Joshua Stevens, using Suomi NPP VIIRS data from Miguel Román, NASA's Goddard Space Flight Center
The Power of Citizen Science
<p>It's not easy to observe and document bird migration, especially for species that migrate at night. The main challenge is that many of these species are very small, which limits scientists' ability to use electronic tracking devices.</p><p>With the growth of the internet and other information technologies, new data resources are becoming available that are making it possible to overcome some of these challenges. <a href="https://doi.org/10.1038/d41586-018-07106-5" target="_blank">Citizen science initiatives</a> in which volunteers use online portals to enter their observations of the natural world have become an important resource for researchers.</p><p>One such initiative, <a href="https://ebird.org/home" target="_blank" rel="noopener noreferrer">eBird</a>, allows bird-watchers around the globe to share their observations from any location and time. This has produced one of the <a href="https://doi.org/10.1111/ecog.04632" target="_blank" rel="noopener noreferrer">largest ecological citizen-science databases in the world</a>. To date, eBird contains over 922 million bird observations compiled by over 617,000 participants.</p>Light Pollution Both Attracts and Repels Migratory Birds
<p>Migratory bird species have evolved to use certain migration routes and types of habitat, such as forests, grasslands or marshes. While humans may enjoy seeing migratory birds appear in urban areas, it's generally not good for bird populations. In addition to the many hazards that exist in urban areas, cities typically lack the food resources and cover that birds need during migration or when raising their young. As scientists, we're concerned when we see evidence that migratory birds are being drawn away from their traditional migration routes and natural habitats.</p><p>Through our analysis of eBird data, we found that cities contained the greatest numbers of migratory bird species during spring and autumn migration. Higher levels of light pollution were associated with more species during migration – evidence that light pollution attracts migratory birds to cities across the U.S. This is cause for concern, as it shows that the influence of light pollution on migratory behavior is strong enough to increase the number of species that would normally be found in urban areas.</p><p>In contrast, we found that higher levels of light pollution were associated with fewer migratory bird species during the summer and winter. This is likely due to the scarcity of suitable habitat in cities, such as large forest patches, in combination with the adverse affects of light pollution on bird behavior and health. In addition, during these seasons, migratory birds are active only during the day and their populations are largely stationary, creating few opportunities for light pollution to attract them to urban areas.</p>Trees and Pavement
<p>We found that tree canopy cover was associated with more migratory bird species during spring migration and the summer. Trees provide important habitat for migratory birds during migration and the breeding season, so the presence of trees can have a strong effect on the number of migratory bird species that occur in cities.</p><p>Finally, we found that higher levels of impervious surface were associated with more migratory bird species during the winter. This result is somewhat surprising. It could be a product of the <a href="https://www.epa.gov/heatislands" target="_blank">urban heat island effect</a> – the fact that structures and paved surfaces in cities absorb and reemit more of the sun's heat than natural surfaces. Replacing vegetation with buildings, roads and parking lots can therefore make cities significantly warmer than surrounding lands. This effect could reduce cold stress on birds and increase food resources, such as insect populations, during the winter.</p><p>Our research adds to our understanding of how conditions in cities can both help and hurt migratory bird populations. We hope that our findings will inform urban planning initiatives and strategies to reduce the harmful effects of cities on migratory birds through such measures as <a href="https://www.arborday.org/programs/treecityusa/index.cfm" target="_blank" rel="noopener noreferrer">planting more trees</a> and initiating <a href="https://aeroecolab.com/uslights" target="_blank" rel="noopener noreferrer">lights-out programs</a>. Efforts to make it easier for migratory birds to complete their incredible journeys will help maintain their populations into the future.</p><p><em><span style="background-color: initial;"><a href="https://theconversation.com/profiles/frank-la-sorte-1191494" target="_blank">Frank La Sorte</a> is a r</span>esearch associate at the </em><em>Cornell Lab of Ornithology, Cornell University. <a href="https://theconversation.com/profiles/kyle-horton-1191498" target="_blank">Kyle Horton</a> is an assistant professor of Fish, Wildlife, and Conservation Biology at the Colorado State University.</em></p><p><em></em><em>Disclosure statement: Frank La Sorte receives funding from The Wolf Creek Charitable Foundation and the National Science Foundation (DBI-1939187). K</em><em>yle Horton does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.</em></p><p><em>Reposted with permission from <a href="https://theconversation.com/cities-can-help-migrating-birds-on-their-way-by-planting-more-trees-and-turning-lights-off-at-night-152573" target="_blank">The Conversation</a>. </em></p>By Lynne Peeples
Editor's note: This story is part of a nine-month investigation of drinking water contamination across the U.S. The series is supported by funding from the Park Foundation and Water Foundation. Read the launch story, "Thirsting for Solutions," here.
In late September 2020, officials in Wrangell, Alaska, warned residents who were elderly, pregnant or had health problems to avoid drinking the city's tap water — unless they could filter it on their own.
Unintended Consequences
<p>Chemists first discovered disinfection by-products in treated drinking water in the 1970s. The trihalomethanes they found, they determined, had resulted from the reaction of chlorine with natural organic matter. Since then, scientists have identified more than 700 additional disinfection by-products. "And those only represent a portion. We still don't know half of them," says Richardson, whose lab has identified hundreds of disinfection by-products. </p>What’s Regulated and What’s Not?
<p>The U.S. Environmental Protection Agency (EPA) currently regulates 11 disinfection by-products — including a handful of trihalomethanes (THM) and haloacetic acids (HAA). While these represent only a small fraction of all disinfection by-products, EPA aims to use their presence to indicate the presence of other disinfection by-products. "The general idea is if you control THMs and HAAs, you implicitly or by default control everything else as well," says Korshin.</p><p>EPA also requires drinking water facilities to use techniques to reduce the concentration of organic materials before applying disinfectants, and regulates the quantity of disinfectants that systems use. These rules ultimately can help control levels of disinfection by-products in drinking water.</p>Click the image for an interactive version of this chart on the Environmental Working Group website.
<p>Still, some scientists and advocates argue that current regulations do not go far enough to protect the public. Many question whether the government is regulating the right disinfection by-products, and if water systems are doing enough to reduce disinfection by-products. EPA is now seeking public input as it considers potential revisions to regulations, including the possibility of regulating additional by-products. The agency held a <a href="https://www.epa.gov/dwsixyearreview/potential-revisions-microbial-and-disinfection-byproducts-rules" target="_blank">two-day public meeting</a> in October 2020 and plans to hold additional public meetings throughout 2021.</p><p>When EPA set regulations on disinfection by-products between the 1970s and early 2000s, the agency, as well as the scientific community, was primarily focused on by-products of reactions between organics and chlorine — historically the most common drinking water disinfectant. But the science has become increasingly clear that these chlorinated chemicals represent a fraction of the by-product problem.</p><p>For example, bromide or iodide can get caught up in the reaction, too. This is common where seawater penetrates a drinking water source. By itself, bromide is innocuous, says Korshin. "But it is extremely [reactive] with organics," he says. "As bromide levels increase with normal treatment, then concentrations of brominated disinfection by-products will increase quite rapidly."</p><p><a href="https://pubmed.ncbi.nlm.nih.gov/15487777/" target="_blank">Emerging</a> <a href="https://pubs.acs.org/doi/10.1021/acs.est.7b05440" target="_blank" rel="noopener noreferrer">data</a> indicate that brominated and iodinated by-products are potentially more harmful than the regulated by-products.</p><p>Almost half of the U.S. population lives within 50 miles of either the Atlantic or Pacific coasts, where saltwater intrusion can be a problem for drinking water supplies. "In the U.S., the rule of thumb is the closer to the sea, the more bromide you have," says Korshin, noting there are also places where bromide naturally leaches out from the soil. Still, some coastal areas tend to be spared. For example, the city of Seattle's water comes from the mountains, never making contact with seawater and tending to pick up minimal organic matter.</p><p>Hazardous disinfection by-products can also be an issue with desalination for drinking water. "As <a href="https://ensia.com/features/can-saltwater-quench-our-growing-thirst/" target="_blank" rel="noopener noreferrer">desalination</a> practices become more economical, then the issue of controlling bromide becomes quite important," adds Korshin.</p>Other Hot Spots
<p>Coastal areas represent just one type of hot spot for disinfection by-products. Agricultural regions tend to send organic matter — such as fertilizer and animal waste — into waterways. Areas with warmer climates generally have higher levels of natural organic matter. And nearly any urban area can be prone to stormwater runoff or combined sewer overflows, which can contain rainwater as well as untreated human waste, industrial wastewater, hazardous materials and organic debris. These events are especially common along the East Coast, notes Sydney Evans, a science analyst with the nonprofit Environmental Working Group (EWG, a collaborator on <a href="https://ensia.com/ensia-collections/troubled-waters/" target="_blank">this reporting project</a>).</p><p>The only drinking water sources that might be altogether free of disinfection by-products, suggests Richardson, are private wells that are not treated with disinfectants. She used to drink water from her own well. "It was always cold, coming from great depth through clay and granite," she says. "It was fabulous."</p><p>Today, Richardson gets her water from a city system that uses chloramine.</p>Toxic Treadmill
<p>Most community water systems in the U.S. use chlorine for disinfection in their treatment plant. Because disinfectants are needed to prevent bacteria growth as the water travels to the homes at the ends of the distribution lines, sometimes a second round of disinfection is also added in the pipes.</p><p>Here, systems usually opt for either chlorine or chloramine. "Chloramination is more long-lasting and does not form as many disinfection by-products through the system," says Steve Via, director of federal relations at the American Water Works Association. "Some studies show that chloramination may be more protective against organisms that inhabit biofilms such as Legionella."</p>Alternative Approaches
<p>When he moved to the U.S. from Germany, Prasse says he immediately noticed the bad taste of the water. "You can taste the chlorine here. That's not the case in Germany," he says.</p><p>In his home country, water systems use chlorine — if at all — at lower concentrations and at the very end of treatment. In the Netherlands, <a href="https://dwes.copernicus.org/articles/2/1/2009/dwes-2-1-2009.pdf" target="_blank">chlorine isn't used at all</a> as the risks are considered to outweigh the benefits, says Prasse. He notes the challenge in making a convincing connection between exposure to low concentrations of disinfection by-products and health effects, such as cancer, that can occur decades later. In contrast, exposure to a pathogen can make someone sick very quickly.</p><p>But many countries in Europe have not waited for proof and have taken a precautionary approach to reduce potential risk. The emphasis there is on alternative approaches for primary disinfection such as ozone or <a href="https://www.pbs.org/wgbh/nova/article/eco-friendly-way-disinfect-water-using-light/" target="_blank" rel="noopener noreferrer">ultraviolet light</a>. Reverse osmosis is among the "high-end" options, used to remove organic and inorganics from the water. While expensive, says Prasse, the method of forcing water through a semipermeable membrane is growing in popularity for systems that want to reuse wastewater for drinking water purposes.</p><p>Remucal notes that some treatment technologies may be good at removing a particular type of contaminant while being ineffective at removing another. "We need to think about the whole soup when we think about treatment," she says. What's more, Remucal explains, the mixture of contaminants may impact the body differently than any one chemical on its own. </p><p>Richardson's preferred treatment method is filtering the water with granulated activated carbon, followed by a low dose of chlorine.</p><p>Granulated activated carbon is essentially the same stuff that's in a household filter. (EWG recommends that consumers use a <a href="https://www.ewg.org/tapwater/reviewed-disinfection-byproducts.php#:~:text=EWG%20recommends%20using%20a%20home,as%20trihalomethanes%20and%20haloacetic%20acids." target="_blank" rel="noopener noreferrer">countertop carbon filter</a> to reduce levels of disinfection by-products.) While such a filter "would remove disinfection by-products after they're formed, in the plant they remove precursors before they form by-products," explains Richardson. She coauthored a <a href="https://pubs.acs.org/doi/10.1021/acs.est.9b00023" target="_blank" rel="noopener noreferrer">2019 paper</a> that concluded the treatment method is effective in reducing a wide range of regulated and unregulated disinfection by-products.</p><br>Greater Cincinnati Water Works installed a granulated activated carbon system in 1992, and is still one of relatively few full-scale plants that uses the technology. Courtesy of Greater Cincinnati Water Works.
<p>Despite the technology and its benefits being known for decades, relatively few full-scale plants use granulated active carbon. They often cite its high cost, Richardson says. "They say that, but the city of Cincinnati [Ohio] has not gone bankrupt using it," she says. "So, I'm not buying that argument anymore."</p><p>Greater Cincinnati Water Works installed a granulated activated carbon system in 1992. On a video call in December, Jeff Swertfeger, the superintendent of Greater Cincinnati Water Works, poured grains of what looks like black sand out of a glass tube and into his hand. It was actually crushed coal that has been baked in a furnace. Under a microscope, each grain looks like a sponge, said Swertfeger. When water passes over the carbon grains, he explained, open tunnels and pores provide extensive surface area to absorb contaminants.</p><p>While the granulated activated carbon initially was installed to address chemical spills and other industrial contamination concerns in the Ohio River, Cincinnati's main drinking water source, Swertfeger notes that the substance has turned out to "remove a lot of other stuff, too," including <a href="https://ensia.com/features/drinking-water-contamination-pfas-health/" target="_blank" rel="noopener noreferrer">PFAS</a> and disinfection by-product precursors.</p><p>"We use about one-third the amount of chlorine as we did before. It smells and tastes a lot better," he says. "The use of granulated activated carbon has resulted in lower disinfection by-products across the board."</p><p>Richardson is optimistic about being able to reduce risks from disinfection by-products in the future. "If we're smart, we can still kill those pathogens and lower our chemical disinfection by-product exposure at the same time," she says.</p><p><em>Reposted with permission from </em><em><a href="https://ensia.com/features/drinking-water-disinfection-byproducts-pathogens/" target="_blank">Ensia</a>. </em><a href="https://www.ecowatch.com/r/entryeditor/2649953730#/" target="_self"></a></p>