Category Archives: Plankton

Amusing Monday: Watching green waters for St. Patrick’s Day

In Chicago, it has become a tradition to dye the Chicago River bright green to celebrate St. Patrick’s Day, as shown in a timelapse video featured by ABC News. But some waterways are naturally green, so I have posted eight videos from throughout the world to show these natural wonders.

Huge crowds of people visit the Chicago River each year to see the color change, which lasts about five hours, according to a report by Jennifer Wood in Mental Floss.

At one time, a green dye was used as needed to identify sources of sewage flowing into the river, Jennifer reports. The result was an occasional green splotch seen in the river. In 1962, a member of the local plumbers union thought it would be a good idea to dye the entire river green for St. Patrick’s Day. It has since become an annual tradition — although in 1966 the dye was changed to a nontoxic vegetable-based coloring at the insistence of environmentalists.

Today, environmentalists are still grumbling about artificially turning the river green, not so much because of damage to the ecosystem — which is really unknown — but because the river is much healthier than it has been in 150 years, according to a report by Steven Dahlman in Loop North News.

“I think [it] sends a message to people that the river is not alive,” said Margaret Frisbie, executive director of Friends of the Chicago River. “Dyeing the river green does not respect that resource.”

In a story written for Smithsonian magazine, Jennifer Billock reports that no dye is needed if you really want to enjoy St. Patrick’s Day in or around a green waterway. The source of the green color varies from one place to another and may include natural minerals, algae growth or even optical illusions based on reflections or depth.

Jennifer talked to Rick Stumpf, an oceanographer who said one of his favorite places is Florida Bay in the Keys, where the green color is a reflection of seagrass just a few feet underwater.

Our tour of green waterways begins with Lake Carezza, in South Tyrol, Italy. The lake is fed from underground springs, and the level of the lake changes with the seasons.

According to a local fairy tale, a wizard fell in love with a beautiful water nymph while watching her braid her hair at the edge of the lake. To get her attention, a witch advised him to dress up as a jewel merchant and cast a rainbow across the lake. He followed her instructions except that he forgot to change his clothes. The water nymph realized his true identity and disappeared into the lake. In frustration, the wizard destroyed the rainbow, which fell into the lake, and then he tossed all of his jewels into the water, leaving the lake with its unusual colors.

Wai-O-Tapu is a lake in an 18-square-mile geothermal area in New Zealand’s Taupo Volcanic Zone. The green color of the water, which is somewhat milky and yellowish, is due to particles of sulfur floating in the water.

The area has been protected as a scenic reserve since 1931 and includes a tourism attraction known as Wai-O-Tapu Thermal Wonderland. Marked hiking trails provide visitors access to natural hot springs and mud pools.

The Verzasca River in Switzerland is a 19-mile river known for its turquoise-colored water and colorful rocks. The swift river, which flows into Lake Maggiore, is popular with scuba divers.

The green colors are provided by natural algae growing in the water as well as the reflection of vegetation along the shoreline.

Ambergris Caye, the largest island in Belize, offers the sea-green colors of a tropical paradise. It is mainstay for tourists who wish to swim or dive in the Caribbean Sea. Visitors can enjoy the marine life of Belize Barrier Reef, the longest reef system in North America, second in the world after the Great Barrier Reef of Australia.

Blue Spring State Park features the largest spring on Florida’s St. Johns River, a critical winter refuge for manatees. To protect the manatees, the spring pool is closed from Nov. 15 to March 15.

From the pool, a vertical cave plunges down to a room about 90 feet deep. At about 120 feet down, the cave constricts and water pours swiftly out of the spring, which produces about 165 million gallons of water per day.

In addition to the pool, the park includes a historic home and offers boat tours, hiking trails and camping sites.

Lake Quilotoa in Ecuador is a deep crater lake in the Andes formed by the collapse of a volcano following an eruption about 600 years ago. The green color is caused by dissolved minerals.

In five hours, visitors can hike around the volcano’s caldera, which is about two miles across. Pack mules and guides are available in and around the village of Quilotoa.

Sproat Lake is located in the center of Vancouver Island in British Columbia. In addition to lakeside homes, three provincial parks are located along the shore.

Sproat Lake Provincial Park features a variety of trails, including one trail that reaches the eastern side of the lake. A wall of rock carvings, named K’ak’awin, depict mythological creatures. The age of the petroglyphs is unknown.

Abyss Pool is the name of a hot spring in the West Thumb Geyser Basin of Yellowstone National Park. In 1883, a visitor to the park called the pool “a great, pure, sparkling sapphire rippling with heat.”

The pool is about 50 feet deep. A geyser in the pool had no record of eruption until 1987, when the first eruption was followed by several others until June 1992. The eruptions were up to 100 feet high.

Nitrogen and plankton: Do they hold the missing keys to the food web?

In a way, some of Puget Sound’s most serious ecological problems have been hiding in plain sight. I have been learning a lot lately about plankton, an incredibly diverse collection of microscopic organisms that drift through the water, forming the base of the food web.

Sources of nitrogen in Puget Sound (click to enlarge)
Graphic: Washington Department of Ecology

To put it simply, the right kinds of plankton help to create a healthy population of little fish that feed bigger fish that feed birds and marine mammals, including the endangered Southern Resident killer whales. On the other hand, the wrong kinds of plankton can disrupt the food web, stunt the growth of larger creatures and sometimes poison marine animals.

OK, that’s a bit of an oversimplification, but Puget Sound researchers are just beginning to understand the profound importance of a healthy planktonic community to support a large part of the food web. That’s one of the main points that I try to bring out in five stories published today in the Encyclopedia of Puget Sound. I am grateful to the many researchers who have shared their knowledge with me.

Average daily nitrogen coming in from rivers and wastewater treatment plants (1 kg = 2.2 pounds)
Graphic: Washington Department of Ecology

These stories tie together several major issues all related to nutrients — mainly nitrogen — that feed the marine phytoplankton, which use their chlorophyll to take energy from the sun as they grow and multiply. In the spring and summer, too much nitrogen can mean too much plankton growth. In turn, excess plankton can lead to low-oxygen conditions, ocean acidification and other significant problems.

The complex interplay of planktonic species with larger life forms in Puget Sound is still somewhat of a mystery to researchers trying to understand the food web. As part of the effort, the Washington Department of Ecology is working on a computer model to show how excess nitrogen can trigger low-oxygen conditions in the most vulnerable parts of the Salish Sea, such as southern Hood Canal and South Puget Sound.

Areas of Puget Sound listed as “impaired” for dissolved oxygen (click to enlarge)
Graphic: Washington Department of Ecology

Stormwater is often cited as the most serious problem facing Puget Sound, and we generally think of bacteria and toxic chemicals flowing into the waterway and causing all sorts of problems for the ecosystem. But stormwater also brings in nitrogen derived from fertilizers, animal wastes and atmospheric deposits from burning fossil fuels. Stormwater flows also pick up natural sources of nitrogen from plants and animals that end up in streams.

Sewage treatment plants are another major source of human nitrogen. Except for a few exceptions, not much has been done to reduce the release of nutrients from sewage-treatment plants, which provide not only nitrogen but also micronutrients such as vitamins and minerals. Some experts suspect that nutrients other than nitrogen help to determine which types of plankton will dominate at any given time.

I plan to follow and report on new scientific developments coming out of studies focused on the base of the food web. Meanwhile, I hope you will take time to read this package of related stories:

Carbon emissions and nitrogen releases alter Puget Sound’s chemistry

Understanding the chemistry of Puget Sound may be as important as understanding the biology. Let me put that another way: Biology as we know it in Puget Sound wouldn’t exist without the right chemistry.

Tiny krill, one of many organisms affected by ocean acidification, demonstrate how water chemistry can affect the entire Puget Sound food web. For example, krill are eaten by herring, which are eaten by Chinook salmon, which are eaten by killer whales.
Photo: Wikimedia Commons

Ocean acidification is altering the chemistry of the oceans on a worldwide scale, but the Pacific Northwest and Puget Sound are being hit with some of the most severe problems, as experts point out in a new report by the Washington State Marine Resources Advisory Council.

For years, I have written about the low-oxygen problems in Hood Canal and other areas of Puget Sound. Of course, oxygen is essential to life as we know it. Major fish kills, in which dead fish float to the surface, have generated a lot of attention. At the same time, it has been harder to report on the animals dying from lack of oxygen when their carcasses are at rest in deep water. And it has been nearly impossible to keep track of the “dead zones” that come and go as conditions change.

It wasn’t until more research was conducted on the effects of ocean acidification that researchers realized that low-oxygen conditions — which were bad enough — had a dangerous companion called low pH — the increased acidity that we are talking about. Low pH can affect the growth and even the survival of organisms that build shells of calcium, including a variety of tiny organisms that play key roles in the food web.

As the oceans absorb carbon dioxide from the air, we see an increase in carbonic acid in the water, which has an effect on the ability of organisms to take up calcium carbonate. For a more complete explanation, check out “What is aragonite saturation?” on page 17 of the report.

Increased acidification is a special problem for Washington and the West Coast of North America, where deep acidified water in the Pacific Ocean hits the coast and rises to the surface.

“By accident of geography, we have this upwelling that … forces us into dealing with ocean acidification before almost anywhere else on the planet,” said Jay Manning, chairman of the Puget Sound Leadership Council. “I don’t believe I’m exaggerating when I say that Washington is leading the world in terms of science and monitoring…”

Jay, who serves on the Marine Resources Advisory Council, was quoted in a story I wrote for the Puget Sound Institute, later republished by the Kitsap Sun. The story describes some of the problems resulting from ocean acidification in Puget Sound, where an entirely different mechanism connects ocean acidification closely to low-oxygen conditions.

Researchers have concluded that an excessive growth of plankton in Puget Sound can be triggered, in part, by the release of nutrients from sewage treatment plants, septic systems and the heavy use of fertilizers. When plankton die and decay, bacteria use up oxygen while releasing carbon dioxide, thus increasing acidification.

Although the details still need to be sorted out, it is clear that some creatures are more sensitive than others to low oxygen, while low pH also affects animals in different ways. This “double whammy” of low oxygen and low pH increases the risks to the entire food web, without even considering the added threats of higher temperatures and toxic pollution.

Ongoing actions emphasized in the new report fall into six categories:

  • Reduce carbon emissions
  • Cut back on nutrient releases into the water
  • Improve adaptation strategies to reduce the harmful effects of ocean acidification
  • Invest in monitoring and scientific investigations
  • Inform, educate and engage Washington residents and key decision makers
  • Maintain a coordinated focus on all aspects of ocean acidification

“The updated report reinforces our federal, state and tribal partnership to combat ocean acidification by working together, modifying and expanding on approaches we have developed through ongoing research,” said Libby Jewett, director of NOAA’s Ocean Acidification Program in a news release (PDF 166 kb).

“For instance,” she continued, “in the new plan, scientists in the state of Washington will be asked not only to test hands-on remediation options which involve cultivating kelp as a way to remove carbon dioxide from local waters but also to explore how to move this seaweed into land agriculture as a way of recycling it.”

I thought Martha Kongsgaard, chairwoman of the MRAC, said it well in an introduction to the report (PDF 39 kb):

“Global and local carbon dioxide emissions, as well as local nutrient sources beyond natural levels, are significantly altering seawater chemistry. We are the cause for the rapid accumulation of 30 to 50 percent of the enriched CO2 in surface waters in Puget Sound and 20 percent of enriched CO2 in deep waters off our shores. Washingtonians understand what is so dramatically at stake. We are not standing by waiting for someone else to inform or rescue us.”

Puget Sound report tells the environmental story that took place in 2016

The year 2016 may be regarded as a transition year for Puget Sound, coming between the extreme warm-water conditions of 2014 and 2015 and the more normal conditions observed over the past year, according to the latest Puget Sound Marine Waters report.

Click on image to view report
Photo: Todd Sandell, WDFW

The report on the 2016 conditions was released this past week by the Marine Waters Workgroup, which oversees the Puget Sound Ecosystem Monitoring Program (PSEMP). The report includes data collected in 2016 and analyzed over the past year.

Some findings from the report:

  • Water temperatures were well above normal, though not as extreme as in 2015.
  • A warm spring in 2016 caused rapid melting of mountain snowpack and lower streamflows in late spring and summer.
  • Dissolved oxygen levels were lower than average in South Puget Sound, Central Puget Sound and Hood Canal, with the most intense oxygen problems in southern Hood Canal, although no fish kills were reported.
  • It was a year for the growth of Vibrio parahaemolyticus, a bacteria responsible for 46 laboratory-confirmed illnesses, including intestinal upset, among people who ate oysters in Washington during 2016.
  • Paralytic shellfish poisoning (PSP), diarrhetic shellfish poisoning (DSP) and domoic acid (DA) resulted in shellfish closures in 18 commercial and 38 recreational growing areas. But no illness were reported in 2016.
  • DSP was detected at 250 micrograms per 100 grams in blue mussel tissues sampled from Budd Inlet near Olympia last year. That is the highest level of DSP ever detected in Washington state.
  • Overall, zooplankton populations were high in 2016 compared to 2014, but generally not as high as in 2015.

Conditions, known or unknown, were responsible for various effects on fish and wildlife in 2016:

  • It was the worst year on record for the Cherry Point herring stock, which has been decline for years along with more recent declines in South and Central Puget Sound. Five local stocks had no spawn that could be found in 2016. Herring were smaller than average in size.
  • The overall abundance and diversity of marine bird species in 2015-16 were similar to 2014-15.
  • Rhinoceros auklets, however, were reported to have serious problems, which experts speculated could be related to a low abundance and size of herring. On Protection Island, breeding season started out normal, but fledgling success was only 49 percent, compared to 71 percent in 2015. Auklet parents were seen to feed their chicks fewer and smaller fish than usual.
  • Including the Washington Coast, more than 1,000 carcasses of rhinocerous auklets were found by volunteers. The primary cause of death was identified as severe bacterial infections.

If you are an average person concerned about environmental conditions in and around Puget Sound, the two-page summary and four-page highlights section near the beginning of the report will leave you better informed. To dig deeper, peruse the pages that follow.

The report is designed to be easily compared with previous years:

Puget Sound freshens up with a little help from winter snowpack

In the latest “Eyes Over Puget Sound” report, one little note caught my attention: “Puget Sound is fresher than it’s ever been the past 17 years.”

Jellyfish are largely missing this fall from Puget Sound. Some patches of red-brown algae, such as this one in Sinclair Inlet, have been observed.
Photo: Washington Department of Ecology

At least temporarily, something has changed in the waters of Puget Sound over the past few months. It may not last, but it appears to be a good thing.

The monthly EOPS report, compiled by a team of state environmental experts, lays out recent water-quality data for the Department of Ecology. The report also includes personal observations, aerial photographs and scientific interpretations that keep readers abreast of recent conditions while putting things in historical context.

The “fresh” conditions called out in the report refers to the salinity of Puget Sound, which is driven largely by the freshwater streams flowing into the waterway. The reference to 17 years is a recognition that the overall salinity hasn’t been this low since the current program started 17 years ago.

Dissolved oxygen, essential to animals throughout the food web, was higher this fall than we’ve seen in some time. Hood Canal, which I’ve watched closely for years, didn’t come close to the conditions that have led to massive fish kills in the past. The only problem areas for low oxygen were in South Puget Sound.

Water temperatures in the Sound, which had been warmer than normal through 2015 and 2016, returned to more average conditions in 2017. Those temperatures were related, in part, to the warm ocean conditions off the coast, often referred to as “the blob.” In South Puget Sound, waters remained warm into October.

Why is the water fresher this fall than it has been in a long time? The reason can be attributed to the massive snowpack accumulated last winter, according to oceanographer Christopher Krembs, who leads the EOPS analysis. That snowpack provided freshwater this past spring, although rivers slowed significantly during the dry summer and continued into September.

“We had a really good snowpack with much more freshwater flowing in,” Christopher told me, adding that the Fraser River in southern British Columbia was well above average in July before the flows dropped off rapidly. The Fraser River feeds a lot of freshwater into northern Puget Sound.

Freshwater, which is less dense than seawater, creates a surface layer as it comes into Puget Sound and floats on top of the older, saltier water. The freshwater input fuels the circulation by generally pushing out toward the ocean, while the heavier saltwater generally moves farther into Puget Sound.

“The big gorilla is the upwelling system,” Christopher noted, referring to the rate at which deep, nutrient-rich and low-oxygen waters are churned up along the coast and distributed into the Puget Sound via the Strait of Juan de Fuca. Lately, that system has been turned down to low as a result of larger forces in the ocean.

In an advisory issued today (PDF 803 kb), NOAA’s Climate Prediction Center says a weak La Niña is likely to continue through the winter. For the northern states across the country, that usually means below-average temperatures and above-average precipitation. (It’s just the opposite for the southern states.)

With a favorable snowpack already accumulating in the mountains, experts can’t help but wonder if we might repeat this year’s conditions in Puget Sound over the next year.

Christopher told me that during aerial flights this fall, he has observed fewer jellyfish and blooms of Noctiluca (a plankton known to turn the waters orange) than during the past two years. Most people think this is a good thing, since these organisms prevail in poor conditions. Such species also have a reputation as a “dead end” in the food web, since they are eaten by very few animals.

Christopher said he noticed a lot of “bait balls,” which are large schools of small fish that can feed salmon, birds and a variety of creatures. “I assume most of them are anchovies,” he said of the schooling fish.

I would trade a jellyfish to get an anchovy on any day of the year.

Amusing Monday: Odd-looking pyrosomes more familiar in the tropics

“I have just watched the moon set in all her glory, and looked at those lesser moons, the beautiful Pyrosoma, shining like white-hot cylinders in the water.”English biologist Thomas H. Huxley, 1849

Warmer-than-normal waters off the coast of Oregon, Washington and British Columbia may be responsible for an invasion of all sorts of creatures normally found to the south in more tropical waters. None of these animals has attracted more attention than the bright bioluminescent pyrosomes, which showed up last spring as the waters of the Pacific Ocean were returning to normal temperatures.

Pyrosomes — which comes from the Greek word “pyro,” meaning fire, and “soma,” meaning body —are large colonies of small tunicates. These are invertebrates that feed by filtering sea water. The individual tunicates, called zooids, hook together to form tubes. The intake siphon of each zooid is aligned to the outside of the tube, while each discharge siphon is aligned to the inside.

The pyrosomes seen in Northwest waters so far are relatively small, thus fitting their nickname “sea pickles.” Nevertheless, they have impressed scientists who have observed them. The first video, above, was made in late July during the 2017 Nautilus Expedition along the West Coast (Water Ways, Sept. 4).

Hilarie Sorensen, a University of Oregon graduate student, participated in a research cruise in May, traveling from San Francisco to Newport in search of jellyfish that had invaded Northwest waters over the previous two years. She didn’t find the jellies she hoped to see, but she was blown away by the pyrosomes, some more than two feet long, and she wondered what they were up to.

“I am interested in how short- and long-term physical changes in the ocean impact biology,” Hilary was quoted as saying in a UO news release. “With all of these pyrosomes this year, I would like to further explore the relationship between their distribution, size and abundance with local environmental conditions.”

Reporter Craig Welch wrote about the recent findings for National Geographic. He quoted Laurie Weitkamp, a biologist with NOAA’s Northwest Fisheries Science Center: “For something that’s never really been here before, the densities are just mind-boggling,” she said. “We’re just scratching our heads.”

Even more impressive are the giant pyrosomes that have not shown up in Northwest waters, at least so far. They are rare even in tropical locales. Check out the second video, which shows a pyrosome found in the Canary Islands in North Africa and estimated to be about 12 feet long.

The third video was filmed in Tasmania south of Australia by Michael Baron of Eaglehawk Dive Centre. It shows both a giant pyrosome and a salp, another colonial creature formed of larger individuals. For the full story on the pyrosome, go to the BBC Two program, “Unidentified glowing object: nature’s weirdest events.”

Another good video on YouTube shows a giant pyrosome in the Maldive Islands off southern India.

Oddly enough, pyrosomes seem to light up in response to light, according to information posted on an invertebrate zoology blog at the University of California at Davis. The colonies may also light up in response to electrical stimulation or physical prodding.

When an individual zooid has activated its luminescence, it will trigger a chain reaction throughout the colony with nearby zooids lighting up in turn.

“When many pyrosomes are present in the same general area it’s possible to observe a vivid array of bright, pale lights produced by the many animals,” said Ian Streiter in the blog post.

“It was just this sort of observation that led the great Thomas Huxley (‘Darwin’s Bulldog’) to remark in 1849: ‘I have just watched the moon set in all her glory, and looked at those lesser moons, the beautiful Pyrosoma, shining like white-hot cylinders in the water.’

Ian concluded, “For those lucky enough to be at sea when they’re around, I imagine there are few sights as pleasant as that of the ‘moonlight’ produced by the fire bodies.”

Other information:

Finally, there is this audio report, “Millions of tropical sea creatures invade waters off B.C. coast,” with commentary from Washington state fisherman Dobie Lyons and zooplankton taxonomist Moira Galbraith of the Institute of Ocean Sciences in Sidney, B.C. They appeared on All Points West, CBC Radio, with Jason D’Souza of Victoria.

Amusing Monday: Splendid underwater images from EV Nautilus

Exploration Vessel Nautilus has completed its journey north to the Olympic Coast National Marine Sanctuary, where the research team captured plenty of intriguing video, including a close look at the sunken submarine USS Bugara (first video below). All videos are best in full screen.

EV Nautilus, operated by Ocean Exploration Trust, conducts scientific research along the sea bottom throughout the world, specializing in biology, geology and archeology. Education is a major part of the effort, and school curricula are built around live and recorded telecasts from the ship. In addition, a select group of educators and students are invited to go on the expeditions each summer.

This year’s expedition began in May in California, where the ship took data for high-resolution maps of offshore areas never surveyed before. That was followed by an examination of the Cascadia Margin, a geologically active area off the Oregon Coast where the researchers identified bubbling seeps with multibeam sonar.

Dives using remotely operated vehicles began in June when the ship arrived off the Canadian Coast west of Vancouver Island. One dive, which went down to 2,200 meters, captured images of a hydrothermal vent, where water gets expelled after being superheated by the Earth’s magma. Watch the video saved on the Nautilus Facebook page. In another video, the temperature at one vent got so hot that the researchers found themselves cheering as the temperature at the probe kept going up.

I am easily amused, but I have to say that I was intrigued by a 9,000-year-old living reef made of glass sponges that was discovered off the coast of Galiano Island, British Columbia (second video this page).

One amusing video was created while watching a six-gill shark in the Channel Islands off California. Suddenly, a crab came into view carrying another crab (third video below). “It’s an Uber crab!” one researcher commented. “Is that lunch?” another wondered.

Another great shot from the Channel Islands showed a big ball of shimmering anchovies along with a select group of predators, including several fish, a six-gill shark and a sea lion. This video can be seen on the Nautilius Facebook page.

The examination of the submarine Bugara (first video on this page) occurred Aug. 25 off Cape Flattery in Olympic Coast National Marine Sanctuary. The event was live-streamed with commentary from scientists, archaeologists and historians, as well as veterans who served on the submarine. Bugara was built during World War II and later became the first American submarine to enter the Vietnam War after Congress passed the Gulf of Tonkin Resolution.

After its decommissioning in California, Bugara was being towed to Washington state to serve as a target for a new weapons system. On June 1, 1971, the submarine took on water during transit and sank to the bottom, where it has rested ever since. No injuries occurred during the incident. For historical details, go to Bugara.net, which was set up for former sailors and others associated with the submarine.

A longer 1.5-hour video of the Bugara inspection by ROV can be viewed on the Nautilus Facebook page. This is basically what was viewed online in real time by observers — including a group gathered at Naval Undersea Museum at Keyport.

Another interesting video shot in Olympic Coast National Marine Sanctuary shows a siphonophore, a colony of specialized organisms that work together to form a chain of individuals that together are capable of swimming, stinging, digesting and reproducing. Researchers working the 4-to-8-p.m. shift were able to observe more than their share of these interesting colonies, so the group became known as the “Siphono4-8” (video below).

Nautilus currently is moored in Astoria, Ore., where it is scheduled to begin the next leg of its expedition on Wednesday. The goal is to search near Oregon’s Heceta Bank for ancient coastal landscapes that may have been above sea level 21,000 to 15,000 years ago. More live sessions and archived video are planned. Follow these Nautilus links for details:

The Ocean Exploration Trust was founded in 2008 by Robert Ballard, known for his discovery of RMS Titanic’s final resting place. The 2017 Nautilus expedition, which will continue into November, marks the third year of exploring the Eastern Pacific Ocean. The expedition has been covered by these news media:

Amusing Monday: Science is music when data becomes sound

Nearly everyone who deals in scientific information learns to read simple charts and graphs to help visualize the data. As a reporter, I’m often looking for the right graph to bring greater meaning to a story. In a similar way, some people have been experimenting with rendering data into sound, and some of the more musically inclined folks have been creating songs with notes and musical scales.

As with graphs, one must understand the conceptual framework before the meaning becomes clear. On the other hand, anyone can simply enjoy the music — or at least be amused that the notes themselves are somehow transformed from observations of the real world.

The first video on this page, titled “Bloom,” contains a “song” derived from microorganisms found in the English Channel. The melody depicts the relative abundance of eight different types of organisms found in the water as conditions change over time. Peter Larsen, a biologist at the U.S. Department of Energy’s Argonne National Laboratory in Illinois, explains how he created the composition to Steve Curwood, host of the radio program “Living on Earth.”

      1. Living on Earth

Continue reading

Close call, but Hood Canal may escape a major fish kill this fall

With some luck, southern Hood Canal may avoid a major fish kill this year, as we observe extremely low oxygen levels beginning to dissipate.

oxygen

It looks like the fish around Hoodsport dodged a bullet on Friday when south winds pushed the surface layer of oxygenated water to the north, bringing hypoxic waters up from below, according to data from the Ocean Remote Chemical Analyzer (ORCA) buoy near Hoodsport.

University of Washington researchers watching the conditions issued this alert on Friday: “Hypoxic waters have been observed intermittently at the surface at our Hoodsport mooring — in addition to the Twanoh mooring —consistent with the strong southerly winds and upwelling conditions we’ve been seeing over the past few days.”

Seth Book, who monitors the water conditions for the Skokomish Tribe, said he was on vacation last week and did not make his usual rounds to observe potential fish kills. But we have not heard of any reports of dead or dying marine life along the shores of Hood Canal.

The risk of a fish kill is still present, and another strong wind out of the south has the potential to bring more low-oxygen water to the surface. The layers of water and the timing appear similar to last year, when south winds brought deep-water fish — such as ratfish — to the surface, as Seth recorded in a video. See Water Ways, Sept. 1, 2015.

depth

Each summer, sunny weather brings a growth of phytoplankton that eventually dies, sinks to the bottom and decays, a process that consumes oxygen. The result is extremely low levels of oxygen near the bottom of Hood Canal, a situation that continues until a surge of seawater in late summer or fall pushes in from the Pacific Ocean.

Because of its higher salinity, that seawater comes in along the bottom and pushes up the low-oxygen water, which gets sandwiched between the ocean water and the more oxygenated water near the surface. If the surface layer gets displaced suddenly by the wind, the fish have no place to go to get oxygen. That appeared to be the condition on Friday, but now the middle layer is growing thinner as it mixes with the layers above and below.

Conditions are improving, Seth confirmed, “but the negative side of me still says we have low D.O.” Crabs, shrimp and deep-water fish may be out of the woods for this year, thanks to higher levels of oxygen in the incoming seawater, but mid-level fish are still at risk until the water column equalizes to a greater extent.

In July, areas farther north in Hood Canal, such as Dabob Bay, experienced low-oxygen conditions, which drove a variety of fish to the surface, Seth told me. Of particular interest were thousands of Pacific herring trying to breathe by staying in the upper foot of water along the shore.

“We have dodged something so far this year,” Seth said. “I am hopeful because we are now into September and we can see this intrusion continuing.”

time

Invasive species hitching a ride into Puget Sound

We hear about the “balance of nature,” but it’s not something that we can truly understand until the balance is thrown out of whack by something like climate change or invasive species.

Until I began a recent reporting project for Puget Sound Institute, I never realized that San Francisco Bay was such a hotbed of invasive species. Beginning with the California Gold Rush, ships began moving in and out of the bay in unbelievable numbers, arriving from ports all around the world. Now, more than 200 non-native species are making their permanent home in the bay — including some species that have thoroughly altered the local ecosystem.

So far, we have been lucky in Puget Sound. Experts say we have about 75 firmly established non-native species, yet none of them have created the widespread damage caused in San Francisco Bay by European green crabs and Asian clams or in the Great Lakes by zebra mussels. The video on this page does a good job of telling the Great Lakes story, which has been repeated all over the world.

Once people in Washington state realized how disruptive invasive species can be, the struggle was on to protect Puget Sound from alien invaders — particularly those found in San Francisco Bay, which is just a short hop away on the world scale. My series of stories talks about concerns for Puget Sound and the efforts to control a possible invasion.

Three weeks ago in Water Ways, I described legislation that would reduce state and federal controls over invasive species. See “Bill could increase risks of alien species invasions in Puget Sound waters.”

On the East Coast, where they are native, striped bass are one of the most popular sport fish. Here, Angela Anning of Connecticut shows off her impressive striper. On the West Coast, striped bass could be considered an invasive species. Photo: NOAA
On the East Coast, where they are native, striped bass are one of the most popular sport fish. Here, Angela Anning of Connecticut shows off her impressive striper. On the West Coast, striped bass could be considered an invasive species.
Photo: NOAA

Invasive species range in size from microscopic viruses to four-foot-long striped bass. In California, the striped bass became a prized sport fish after it was intentionally introduced in 1879. But over the past decade concerns have grown for their effects on the salmon population. The jury is still out on whether high numbers of stripers should be sustained for anglers or the population should be fished down rapidly to save salmon and other species. Check out these stories:

Meanwhile, striped bass have been moving up the West Coast, possibly because of warmer waters due to climate change. A few years ago, a 55-pounder was caught in the Columbia River, and I’ve heard rumors that they have been seen in the Strait of Juan de Fuca.

On the small side, I report on a tiny crustacean, an invasive copepod that has almost entirely displaced native copepods in Samish Bay in northern Puget Sound. Copepods are important prey for small fish, including herring, which feed the larger salmon. The invasive copepods are smaller and more difficult for fish to see, which could have a cascading effect on the entire food web.

Invasive copepod Oithona davisae under magnification Photo: Jeff Cordell, University of Washington
Invasive copepod Oithona davisae
Photo: Jeff Cordell, UW

A major concern for Puget Sound biologists is the European green crab, which could move into Puget Sound from San Francisco Bay in ballast water or with warm ocean currents during an El Niño year, like the one just past. As I describe in the new series, a major program involving citizen science volunteers is ongoing in a search to find the first green crabs before they gain a foothold.

Pacific oysters, another non-native species, were intentionally brought to the Northwest from Japan in the early 1900s to replace the native Olympia oyster, which had been decimated by poor water quality. Pacific oysters soon became a mainstay of the shellfish industry in the Puget Sound region and are now growing thick in numerous areas.

European green crab Photo: Washington Sea Grant
European green crab
Photo: Gregory C. Jensen, UW

Similar introductions of Pacific oysters occurred in California beginning more than 100 years ago, but for some reason the oyster populations never took hold, according to a report in the publication California Fish and Game (PDF 1.7 mb). Finally, in the early 2000s, the invasion began to take off.

“It remains unclear why there should be a successful invasion now, given the failure of previous attempts to deliberately introduce the species both locally and throughout California…,” the report says.

“If populations in Southern California waters do continue to expand and grow, as they have in other areas where they have invaded, it will undoubtedly bring changes to the way our estuarine intertidal habitats function as well as in the way we must manage them.

Pacific oyster Photo: Washington Sea Grant
Pacific oyster
Photo: Washington Sea Grant

“Because Pacific oysters rapidly reach large sizes, they could pose problems related to fouling of maritime equipment, infrastructure, and vessels,” the report continues. “Pacific oysters stand out as one of the most transformative invaders of marine ecosystems.”

As Washington state takes steps to keep alien species from invading Puget Sound from California, California officials may adopt similar measures to block invaders from coming into that state.

Please take a look at this package of stories I wrote for Puget Sound Institute, with editing by Jeff Rice and design by Kris Symer: