Tag Archives: warming

Survivor Salmon that Withstand Drought and Ocean Warming Provide a Lifeline for California Chinook

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October 28, 2021, fisheries.noaa.gov

NOAA Fisheries recovery goals include reintroduction to save the late-migrating fish.

A late-migrating spring run Chinook salmon from one of the few Northern California creeks that remain without dams. Credit: Jeremy Notch/UC Santa Cruz.

In drought years and when marine heat waves warm the Pacific Ocean, late-migrating juvenile spring-run Chinook salmon of California’s Central Valley are the ultimate survivors. They are among the few salmon that return to spawning rivers in those difficult years to keep their populations alive. This is according to results published today in Nature Climate Change.

The trouble is that this late-migrating behavior hangs on only in a few rivers where water temperatures remain cool enough for the fish to survive the summer. Today, this habitat is primarily found above barrier dams. Those fish that spend a year in their home streams as juveniles leave in the fall. They arrive in the ocean larger and more likely to survive their 1–3 years at sea.

Scientists examined the ear bones of salmon, called otoliths. These bones incorporate the distinctive isotope ratios of different Central Valley Rivers and the ocean as they grow sequential layers. They looked at Chinook salmon from two tributaries of the Sacramento River without dams that begin beneath Lassen Peak, north of Sacramento. Late-migrating juveniles from Mill Creek and Deer Creek returned from the ocean at much higher rates than more abundant juveniles that leave for the ocean earlier in the spring.

Scientists examined otoliths, the ear bones of salmon, to understand the migration timing of fish that survived drought and poor ocean conditions. Credit: George  Whitman and Kimberly Evans/UC Davis

The different timing characteristics of the fish are referred to as “life-history strategies.” Those with a late-migrating life history strategy represented only about 10 percent of outgoing juveniles sampled in fish monitoring traps. However, they were about 60 percent of the returning adult fish across all years, and more than 96 percent of adults from two of the driest years.

“Some years the late migrants were the only life-history strategy that was successful,” said Flora Cordoleani, lead author of the research and associate project scientist with NOAA Fisheries and UC Santa Cruz. “Those fish can make it through the difficult drought conditions on the landscape because they come from the few remaining rivers with accessible high-elevation habitats where water is cool enough through the summer.”

Recovery Strategies Include Reintroduction

The finding underscores the importance of providing secure cool-water habitat for fish so they can survive difficult conditions during drought and ocean warming, said Rachel Johnson, a NOAA Fisheries research scientist, UC Davis researcher and senior author of the study. “Most salmon blocked from their historical habitats appear to migrate just too early and perish once they encounter the warmer water temperatures during droughts.”

“It appears the late-migrating life history has evolved as an insurance policy against the unfavorable spring river conditions that occur during droughts,” said Corey Phillis, a researcher at the Metropolitan Water District of Southern California and co-author on the study.

The study also projected how Central Valley river temperatures would rise with climate change, leaving only a few higher-elevation rivers cool enough to still sustain salmon. Many of those areas are above existing dams without fish passage.

NOAA Fisheries has outlined reintroduction of salmon to cold-water rivers above dams as a critical recovery strategy for endangered Sacramento River winter-run Chinook, a NOAA Fisheries Species in the Spotlight. The reintroduction of threatened spring-run Chinook salmon to the San Joaquin River watershed has taken hold. Offspring of reintroduced spring-run Chinook salmon are now returning from the ocean. NOAA Fisheries is also advancing the reintroduction of spring-run Chinook to the upper Yuba River upstream of Englebright Dam.

The study found that temperatures would remain cool enough for salmon to survive in the north Yuba River as the climate changes.

“We need to reconnect salmon to their historical habitats so they can draw from their own climate-adapted bag of tricks to persist in a warming world,” Johnson said.

By growing for a year in their home river, the later-migrating fish head for the ocean bigger than the others and in cooler temperatures. That way, more survive and return to rivers to spawn when marine heatwaves warm the ocean and depress salmon survival. A Marine Heatwave Tracker developed by the Southwest Fisheries Science Center shows that heatwaves have become an increasing presence in the Pacific Ocean in the last decade.

A returning adult spring run Chinook salmon leaps from the water in California’s Central Valley. Credit: Carson Jeffres/UC Davis

Heatwaves Reduce Survival

A large heatwave currently stretching across the Pacific off Northern California and Oregon, as shown by the tracker, may affect salmon survival. Warmer ocean waters are generally less productive, reducing salmon survival and depressing returns to rivers.

NOAA Fisheries’ Northwest Fisheries Science Center has developed a “stoplight chart” that projects survival of different salmon species based on different factors at play in the ocean.

The researchers highlighted the importance of protecting varied life histories that may help their species survive climate change. This is particularly true in California, which is at the southern end of the range of many salmon and at the edge of conditions where they can survive.

“The rarest behaviors observed today may be the most important in our future climate,” said Anna Sturrock of the University of Essex and a co-author of the research.

“We show for the first time that the late-migrating strategy is the life-support for these populations during the current period of extreme warming,” the scientists concluded. “As environmental conditions continue to shift rapidly with climate change, maximizing habitat options across the landscape to enhance adaptive capacity and support climate-resilient behaviours may be crucial to prevent extinction.”

Researchers included:

  • NOAA Fisheries’ Southwest Fisheries Science Center
  • UC Santa Cruz
  • UC Davis
  • University of Essex
  • Metropolitan Water District of Southern California
  • Mediterranean Institute of Oceanography
  • Lawrence Livermore National Laboratory

More Information

Read original story on “Survivor Salmon” and explore more on NOAA Fisheries

 

The desperate race to cool the ocean before it’s too late

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Technologyreview.com, By Holly Jean Buck, April 23rd

Holly Jean Buck is a fellow at UCLA’s Institute of the Environment and Sustainability. This is an adapted excerpt from her upcoming book After Geoengineering: Climate Tragedy, Repair, and Restoration (September 2019, Verso Books).

Coral reefs smell of rotting flesh as they bleach. The riot of colors—yellow, violet, cerulean—fades to ghostly white as the corals’ flesh goes translucent and falls off, leaving their skeletons underneath fuzzy with cobweb-like algae.

Corals live in symbiosis with a type of algae. During the day, the algae photosynthesize and pass food to the coral host. During the night, the coral polyps extend their tentacles and catch passing food. Just 1 °C of ocean warming can break down this coral-algae relationship. The stressed corals expel the algae, and after repeated or prolonged episodes of such bleaching, they can die from heat stress, starve without the algae feeding them, or become more susceptible to disease.

Australia’s Great Barrier Reef—actually a 2,300-kilometer (1,400-mile) system made up of nearly 3,000 separate reefs—has suffered severe bleaching in the past few years. Daniel Harrison, an Australian oceanographer looking at what might be done to buy more time for the Great Barrier Reef, says the situation is getting dire. “There might be as little as 25% of shallow-water coral cover left from pre-anthropogenic times. We don’t really know, because nobody started surveying before 1985,” he tells me. “You’ve got less than 1% of the ocean in coral reefs, and 25% of all marine life. We’re looking at losing all of that really quite quickly, in evolutionary terms. In human-lifetime terms.”

Coral reefs are not just about colorful fish and exotic species. Reefs protect coasts from storms; without them, waves reaching some Pacific islands would be twice as tall. Over 500 million people depend on reef ecosystems for food and livelihoods. Even if the temperature increase eventually stabilizes at 1.5 °C a century or two from now, it’s not known how well coral reef ecosystems will survive a temporary overshoot to higher temperatures.

The corals are like the canary in the coal mine.

The corals are like the canary in the coal mine, Harrison says: “They’re very temperature-sensitive. I really do think it’s just a harbinger of things to come. You know, the coral ecosystem might collapse first, but I think there might be quite a few more ecosystems that’ll follow it. Life is very resilient, but ecosystems as we know them aren’t.”

Read more about corals, cooling the ocean, and climate change

Fishing Industry Businesses Endorse I-1631

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FOR IMMEDIATE GENERAL RELEASE:

October 23, 2018

To whom it may concern:

Erling Skaar with his Bering Sea crab vessel the F/V North American. It’s outfitted with his GenTech system, allowing it to operate with far lower emissions and fuel costs than similar vessels.

We write today to announce our support for Washington’s Initiative 1631. As businesses who rely on healthy fisheries for a significant portion of our income, we believe this is a well-designed policy that offers us – and our customers – the best possible chance against an uncertain future fraught with the threats of changing ocean conditions.

It’s become clear that our fisheries need a lifeline. Here in Washington, we are experiencing the worst ocean acidification anywhere in the world. Research has firmly established the cause of this problem: emissions from burning coal, oil and gas mix into the ocean, altering its chemistry. The consequences loomed into headlines a decade ago when the oyster industry lost millions and nearly went out of business during the oyster seed crisis. Temporary and limited adaptation measures in hatcheries are keeping them in business, but in the rest of the oceans, fisheries that put dinner on billions of tables are at risk. Here in the Northwest, harvests are already being eroded and even shut down by the effects of unchecked carbon emissions.

The “warm blob,” an unprecedented marine heatwave off the West Coast, reached its height in 2015 and caused mass fatalities. In the Columbia River, a quarter million salmon died. The largest recorded toxic algae bloom shut down the Dungeness crab fishery for months. The food web crashed, and marine creatures were spotted farther north than ever before. Sea surface temperatures never returned to their previous norm, and new research indicates another blob is forming.

Summers have become synonymous with a smoky haze from wildfires causing poor visibility and poor health – this summer the National Weather Service warned even healthy adults in some Washington areas to stay indoors due to hazardous air quality. At the same time, our iconic Orca whales are starving from a lack of Chinook salmon. The Chinook in turn are suffering from a lack of the zooplankton that juveniles eat.

Research has made it clear that some of our most lucrative fisheries are vulnerable to ocean acidification: king crab, Dungeness crab, and salmon. Scientists also warm that combining stressors – like warming with ocean acidification – makes survival in the ocean all the more precarious.

We studied to understand how to protect our businesses and the natural resources we rely on. The answer was clear: reduce carbon emissions. Reduce them now, and reduce them as quickly as possible.

This is where I-1631 comes in. This fee on carbon, which starts at $15/ton and rises by $2/year, will raise around a billion dollars a year. That revenue will be spent on clean energy projects, energy efficiency, and climate resiliency. Fisheries and ocean acidification projects are specifically included as priority investments.

Maritime fuels will be exempt, so struggling fishing vessel operators won’t pay any additional cost for their fuel. However, they will still qualify for energy efficiency funding. Many of our businesses offer technologies that greatly increase efficiency: sometimes by more than 50%. But over and over, we hear from our customers that despite the obvious advantages and quick return on investment, they simply don’t have the capital to invest in energy efficiency. A billion dollars a year, every year, would provide unprecedented access to that sorely needed capital. Businesses and fleets of vessels or trucks would reap the savings in energy costs, and our environment would reap the benefits of lowered carbon emissions. It’s an obvious win-win.

The fee will likely add about $.14/gallon to the cost of diesel for road transportation, and other energy costs will rise a bit too. But the additional cost could be eliminated by just a 5% increase in efficiency in year one; even in year ten, a 14% increase in efficiency would more than pay the fee. Such efficiency gains are easily achievable with existing technology. Fleets of vessels could be outfitted with more efficient engines or generators, processing facilities could receive grants for more energy efficient refrigeration systems or boilers.

The initiative will also fund work to prevent and mitigate wildfires, flooding, and other extreme weather events, and research to understand the threats to fisheries and investigate mitigation methods.

And the truth is, we’re already paying much more for climate change than I-1631’s fee will cost. We don’t just pay in harvest closures, reduced catches, and lost jobs. We get stuck with an out-of-control tab for the impacts of carbon pollution through our taxes and insurance bills.  Since 1980, the US economy has already endured climate disaster costs of more than $1.5 trillion, according to NOAA. That works out to nearly $10,000 for each individual taxpayer. And those costs are rising. In 2017, NOAA reckons that extreme weather disasters rang up a $306 billion bill in the US. That’s another $2,000 a year on each of us who do the work and pay the bills around here.

In Washington alone, the $1 billion in wildfire response cost since 2014 adds up to a cost of $371 per household. Enough already. I-1631 will combat these threats. Washington will join a global network of price-and-invest policies with a proven track record of improving economies, creating jobs, decreasing health costs, and dramatically reducing emissions. The initiative protects critical Washington industries that can’t afford an added fee, and ensures that low-income households bear no additional burden. It gives tribes and rural communities their due, and because it’s a fee rather than a tax, the funds can never be diverted for other uses: not for the general fund, not for pet projects. The revenue can only be used for emissions reductions and climate resiliency.

Along with a diverse coalition including labor, tribes, physicians, and environment and science experts, I-1631 is also supported by major Washington businesses. Vigor, Microsoft, Expedia, Virginia Mason, MacDonald Miller, and REI are just a handful of the biggest endorsers. We proudly add our names to theirs, and ask other businesses to join us.

For more information contact the Working Group on Seafood and Energy at info@globaloceanhealth.org.

Sincerely,

Erling Skaar
F/V North American and GenTech Global

Pete Knutson
Loki Fish Co

Matt Marinkovich
Matt’s Fresh Fish

Amy Grondin
Duna Fisheries

Greg Friedrichs
F/V Arminta

Mike Cassinelli
Beacon Charters

Lars Matthiesen
Highland Refrigeration

Bob Allen
MER Equipment

Larry Soriano
Alaska Ship Supply

Robert Loe
Robert Loe & Associates

Fish Stocks Are Declining Worldwide, And Climate Change Is On The Hook

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December 14, 2015, NPR.org, Claire Leschin-Hoar

A fisherman shovels grey sole, a type of flounder, out of the hold of a ship at the Portland Fish Pier in Maine, September 2015. New research finds the ability of fish populations to reproduce and replenish themselves is declining across the globe. The worst news comes from the North Atlantic, where most species are declining.For anyone paying attention, it’s no secret there’s a lot of weird stuff going on in the oceans right now. We’ve got a monster El Nino looming in the Pacific. Ocean acidification is prompting hand wringing among oyster lovers. Migrating fish populations have caused tensions between countries over fishing rights. And fishermen say they’re seeing unusual patterns in fish stocks they haven’t seen before.

Researchers now have more grim news to add to the mix. An analysis published Monday in the Proceedings of the National Academy of Sciences finds that the ability of fish populations to reproduce and replenish themselves is declining across the globe.

“This, as far as we know, is the first global-scale study that documents the actual productivity of fish stocks is in decline,” says lead author Gregory L. Britten, a doctoral student at the University of California, Irvine.

Britten and some fellow researchers looked at data from a global database of 262 commercial fish stocks in dozens of large marine ecosystems across the globe. They say they’ve identified a pattern of decline in juvenile fish (young fish that have not yet reached reproductive age) that is closely tied to a decline in the amount of phytoplankton, or microalgae, in the water.

“We think it is a lack of food availability for these small fish,” says Britten. “When fish are young, their primary food is phytoplankton and microscopic animals. If they don’t find food in a matter of days, they can die.”

The worst news comes from the North Atlantic, where the vast majority of species, including Atlantic cod, European and American plaice, and sole are declining. In this case, Britten says historically heavy fishing may also play a role. Large fish, able to produce the biggest, most robust eggs, are harvested from the water. At the same time, documented declines of phytoplankton made it much more difficult for those fish stocks to bounce back when they did reproduce, despite aggressive fishery management efforts, says Britten.

When the researchers looked at plankton and fish reproduction declines in individual ecosystems, the results varied. In the North Pacific — for example, the Gulf of Alaska — there were no significant declines. But in other regions of the world, like Australia and South America, it was clear that the lack of phytoplankton was the strongest driver in diminishing fish populations.

“When you averaged globally, there was a decline,” says Britten. “Decline in phytoplankton was a factor in all species. It was a consistent variable.”

And it’s directly linked to climate change: Change in ocean temperature affects the phytoplankton population, which is impacting fish stocks, he says.

Read more here

Our Deadened, Carbon-Soaked Seas

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The New York Times, October 15th, 2015,

By Richard W. Spinrad and Ian Boyd

Ocean and coastal waters around the world are beginning to tell a disturbing story. The seas, like a sponge,

nytimes oa picare absorbing increasing amounts of carbon dioxide from the atmosphere, so much so that the chemical balance of our oceans and coastal waters is changing and a growing threat to marine ecosystems. Over the past 200 years, the world’s seas have absorbed more than 150 billion metric tons of carbon from human activities. Currently, that’s a worldwide average of 15 pounds per person a week, enough to fill a coal train long enough to encircle the equator 13 times every year.

We can’t see this massive amount of carbon dioxide that’s going into the ocean, but it dissolves in seawater as carbonic acid, changing the water’s chemistry at a rate faster than seen for millions of years. Known as ocean acidification, this process makes it difficult for shellfish, corals and other marine organisms to grow, reproduce and build their shells and skeletons.

About 10 years ago, ocean acidification nearly collapsed the annual $117 million West Coast shellfish industry, which supports more than 3,000 jobs. Ocean currents pushed acidified water into coastal areas, making it difficult for baby oysters to use their limited energy to build protective shells. In effect, the crop was nearly destroyed.

Human health, too, is a major concern. In the laboratory, many harmful algal species produce more toxins and bloom faster in acidified waters. A similar response in the wild could harm people eating contaminated shellfish and sicken, even kill, fish and marine mammals such as sea lions.

Increasing acidity is hitting our waters along with other stressors. The ocean is warming; in many places the oxygen critical to marine life is decreasing; pollution from plastics and other materials is pervasive; and in general we overexploit the resources of the ocean. Each stressor is a problem, but all of them affecting the oceans at one time is cause for great concern. For both the developing and developed world, the implications for food security, economies at all levels, and vital goods and services are immense.

This year, the first nationwide study showing the vulnerability of the $1 billion U.S. shellfish industry to ocean acidification revealed a considerable list of at-risk areas. In addition to the Pacific Northwest, these areas include Long Island Sound, Narragansett Bay, Chesapeake Bay, the Gulf of Mexico, and areas off Maine and Massachusetts. Already at risk are Alaska’s fisheries, which account for nearly 60 percent of the United States commercial fish catch and support more than 100,000 jobs.

Ocean acidification is weakening coral structures in the Caribbean and in cold-water coral reefs found in the deep waters off Scotland and Norway. In the past three decades, the number of living corals covering the Great Barrier Reef has been cut in half, reducing critical habitat for fish and the resilience of the entire reef system. Dramatic change is also apparent in the Arctic, where the frigid waters can hold so much carbon dioxide that nearby shelled creatures can dissolve in the corrosive conditions, affecting food sources for indigenous people, fish, birds and marine mammals. Clear pictures of the magnitude of changes in such remote ocean regions are sparse. To better understand these and other hotspots, more regions must be studied.

Read more here

New Challenges for Ocean Acidification Research

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SpaceDaily.com January 2nd, 2015
Kiel, Germany

To continue its striking development, ocean acidification research needs to bridge ocean acidification between its diverging branches towards an integrated assessment. This is the conclusion drawn by Prof. Ulf Riebesell from GEOMAR Helmholtz Centre for Ocean Research Kiel and Dr. Jean-Pierre Gattuso from the French Centre National de la Recherche Scientifique (CNRS) and Universite Pierre et Marie Curie.

In a commentary in the journal “Nature Climate Change”, the two internationally renowned experts reflect on the lessons learned from ocean acidification research and highlight future challenges.

Over the past decade, ocean acidification has received growing recognition not only in the scientific area. Decision-makers, stakeholders, and the general public are becoming increasingly aware of “the other carbon dioxide problem”. It is time to reflect on the successes and deficiencies of ocean acidification research and to take a look forward at the challenges the fastest growing field of marine science is facing.

In the January issue of the journal “Nature Climate Change” Ulf Riebesell, professor for Biological Oceanography at GEOMAR Helmholtz Centre for Ocean Research Kiel, and Jean-Pierre Gattuso from the French Centre National de la Recherche Scientifique (CNRS) urge the international scientific community to undertake a concerted interdisciplinary effort.

According to the two experts, future ocean acidification research will have to deal with three major challenges: It needs to expand from single to multiple drivers, from single species to communities and ecosystems, and from evaluating acclimation to understanding adaptation. “The growing knowledge in each of the diverging research branches needs to be assimilated into an integrated assessment”, Prof. Riebesell points out.

For the scientific community, it is obvious that ocean acidification does not occur in isolation. Rising temperatures, loss of oxygen, eutrophication, pollution and other drivers happen simultaneously and interact to influence the development of marine organisms and communities.

Read more here