OREGON STATE UNIVERSITY

marine science and the coast

New Study: Iron in Northwest Rivers Fuels Phytoplankton, Fish Populations

CORVALLIS, Ore. – A new study suggests that the iron-rich winter runoff from Pacific Northwest streams and rivers, combined with the wide continental shelf, form a potent mechanism for fertilizing the nearshore Pacific Ocean, leading to robust phytoplankton production and fisheries.

The study, by three Oregon State University oceanographers, was just published by the American Geophysical Union in its journal, Geophysical Research Letters.

West coast scientists have observed that ocean chlorophyll levels, phytoplankton production and fish populations generally increase in the Pacific Ocean the farther north you go (from southern California to northern Washington). No one has a definitive explanation for the increase, the OSU scientists say, though some researchers have suspected river runoff may play a role. That theory has generally been discounted, they added, because river flows are low in the summer when phytoplankton blooms occur.

In their study, however, the OSU scientists found that Northwest rivers churn out huge amounts of iron in the winter and deposit it on the continental shelf, where it sits until the spring and summer winds begin the ocean upwelling process. The authors studied the relationships between phytoplankton, river runoff and shelf width all along the West Coast.

“If we consider just river flows or shelf width by themselves, they explain part of the northward increase in productivity,” said Zanna Chase, an assistant professor in OSU’s College of Oceanic and Atmospheric Sciences and lead author of the study. “But if we analyze both together, they provide a more complete picture. The shelf increases in width as you move north. If the shelf wasn’t there, the iron from rivers would be lost to the open ocean.

“Our shelf acts as a ‘capacitor,’” she added, “storing the iron for the high-productivity upwelling season.”

In their studies, the OSU scientists sampled water from Oregon rivers in the winter and found iron concentrations that were roughly 1,000 times higher than that found in samples of sea water taken from the Pacific Ocean off Oregon. And though previous studies, based on East Coast rivers, have suggested that almost all of the iron in rivers gets trapped in estuaries, this latest study found very different results for Oregon rivers in winter.

The researchers measured iron, ammonium, silicate and salinity levels at the mouth Alsea River during the winter, and tracked how much of it went into the ocean, said Burke Hales, an OSU associate professor of oceanic and atmospheric sciences.

The answer: more than half.

“Iron just doesn’t like to be dissolved,” Hales said, “especially in sea water. When fresh water meets salt, almost all of the iron sticks to particles that sink to the floor of the continental shelf, waiting for the winds to trigger upwelling. In contrast, Monterey, Calif., has a very narrow shelf and if you step off the beach it almost immediately goes to 6,000 feet deep.”

Chase said there doesn’t seem to be a direct relationship between the amount of winter runoff in Northwest streams and the level of phytoplankton production the following summer, indicating the broad Northwest shelf is storing more iron than the phytoplankton need in any given year. As a result, she added, phytoplankton production off the Oregon coast doesn’t seem to be limited by a lack of iron, whereas their cousins off central California – where river flow and shelf width are much less than off Oregon – are “iron-starved” in comparison.

The iron from the Northwest’s winter runoff is trapped on the continental shelf in the winter by downwelling winds that create an oceanographic circulation barrier that prevents the iron from being transported into the open ocean. The Columbia River also plays a role, spilling out into the Pacific and turning north in the winter, further pinning the iron deposits in Washington’s nearshore waters.

Further research is needed to test how much iron is stored in the sediments on Oregon’s continental shelf, the scientists say, and how much gets used during a typical season of upwelling.

“We probably have several years of iron stored out there,” Hales pointed out, “but we don’t know whether ‘several’ means five, 10 or 50 years.”

The importance of iron as a catalyst for ocean productivity invariably raises the question of whether humans can ‘fertilize’ the oceans to boost phytoplankton growth. All three of the authors have been involved in research in the Southern Ocean off Antarctica that tested that concept.

“It’s more complex than simply adding iron to seawater,” said Pete Strutton, an OSU assistant professor of oceanic and atmospheric sciences. “Experiments so far have generally shown an increase in productivity that was less than expected – and it didn’t last long. Adding iron also changes the type of phytoplankton that grew, which might have important ecological consequences we don’t yet understand.”

The Northwest’s system of iron-rich winter river water, a wide continental shelf, and summer upwelling has the overall effect of making this part of the Pacific Ocean a net “carbon sink” – or sequestering more carbon dioxide than the region produces. The ocean off central California, by contrast, “seems to be poised between a carbon source and a sink, depending on the year,” Strutton said.

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Pete Strutton,
541-737-2065

OSU Extension Classes Prepare Fishermen, Scientists to Survive At Sea

NEWPORT, Ore. – A series of one- and two-day classes starting in March aims to prepare fishermen, scientists and others who work at sea to survive the worst of what the marine environment can throw at them.

Organized by Oregon State University’s Sea Grant Extension program and taught by the U.S. Coast Guard, the workshops will also help commercial fishing vessels meet federal regulations requiring them to have at least one crew member on board certified in conducting at-sea safety and survival drills.

The classes are the latest in Sea Grant’s more than 20-year tradition of helping Oregon’s fishing fleet stay safer while at sea.

“The fishing community has always welcomed these kinds of opportunities for safety training,” said Kaety Hildenbrand, Sea Grant Extension agent in Lincoln County. “In recent years, other employers – universities, regulatory agencies, aquariums – have started to realize that when they send their people to sea, they need some basic safety and survival training, too.”

Commercial fishing has long been recognized as one of the most hazardous occupations in the United States. The cold waters of the Pacific Ocean can be lethal when a crew member falls overboard or a vessel capsizes. While safety initiatives have improved the odds, Coast Guard estimates indicate that the fatality rate for commercial fishing vessels remains more than five times higher than that for other domestic commercial vessels.

In an effort to reduce injuries and deaths, federal vessel safety rules and guidelines have been revised and strengthened in recent years – with industry cooperation – to require fishing crews to conduct regular on-board drills in the use of safety procedures and equipment that can save their lives.

The two-day classes, taught by four instructors from the Coast Guard’s District 13 office in Portland, aim at preparing crew members to conduct those drills, and giving them hands-on experience working with a variety of safety equipment and procedures, from abandoning ship safely to how to don and wear the insulated immersion suits meant to keep capsized crew alive and afloat in frigid waters.

While there is a $50 deposit to reserve a spot in the commercial vessel safety classes, it is returned in full when the class is completed.

A second set of classes, each one day long, is directed at marine scientists, graduate students, aquarium specimen collectors and others who work at sea, but who likely have not had the formal training available to fishermen. The Coast Guard will teach these classes, too, for the first time; in the past, they’ve been conducted by community members.

“This is a less-intense version of the two-day course, but it still covers what they need to know to survive an emergency,” said Hildenbrand. “A lot of researchers haven’t had this kind of training, and universities and other employers are starting to require it.”

Two-day classes for commercial fishermen are scheduled March 8-9 in Newport, and March 20-21 in Tillamook. Pre-registration is required, along with a $50 deposit, refundable on completion of the course.

One-day classes for researchers, student research assistants and others will take place March 7, April 14, May 14, May 31 and June 20 in Newport. Pre-registration is required, along with a $25, non-refundable deposit.

To register or get more information about any of the classes, contact Kaety Hildenbrand at the Lincoln County Extension office in Newport, 541-574-6537 Ext. 27, or by e-mail to Kaety.Hildenbrand@oregonstate.edu.

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Kaety Hildenbrand,
541-574-6537, Ext. 27

AAS Panel: Long-lived Deep-sea Fishes Imperiled by Technology, Overfishing

SAN FRANCISCO – Many commercially prized fish from the depths of the world’s oceans are severely threatened by over-fishing and the species’ ability to recover is constrained by the fishes’ long lifespans and low reproductive success, a panel of experts said today at the annual meeting of the American Association of the Advancement of Science.

Some of the fish species living at depths greater than 500 meters take decades to reach breeding maturity, so there are no quick-fix remedies available to replenish the population, said Selina Heppell, a fisheries biologist from Oregon State University.

“The harvest of deep-sea fishes is a lot like the harvest of old-growth timber,” Heppell said, “except we don’t ‘replant’ the fish. We have to depend on the fish to replenish themselves. And the habitat that used to provide them protection – the deep ocean – is now accessible to fishing because of new technologies.”

Among the most recognized deep-sea species at-risk are orange roughy and Patagonian toothfish, better known as Chilean sea bass. In the deep ocean off the Pacific Northwest, sablefish – also known as black cod – are another depleted species.

Deep-sea fishes grow slowly because of limited food sources and slow metabolisms; many don’t reach sexual maturity for 30-40 years, Heppell said. The harvest of older fish may have an even greater impact on threatened populations because they are more likely to breed successfully than younger fish.

“When you buy orange roughy at the store, you are probably purchasing a filet from a fish that is at least 50 years old,” Heppell said. “Most people don’t think of the implications of that. Perhaps we need a guideline that says we shouldn’t eat fish that are as old as our grandmothers.”

Most of the deep-sea fishes are in international waters, where there are no guidelines and protections – unlike within United States territorial waters. Most of these fish are caught by deep trawlers near seamounts, where they congregate because of food.

Technological advances have made targeting these fish easier, the panelists pointed out, because powerful ships can drag huge nets hundreds of feet below the surface. New refrigeration techniques, including “flash freezing,” allow ships to range far out into the ocean for days at a time. And sophisticated global positioning systems (GPS) and fish finders can target schools of fish or seamounts with ease.

“One reason that many of these fish species were fished sustainably in the past is that we couldn’t fish all of the places all of the time,” Heppell said. “That isn’t necessarily true anymore.”

Heppell is a faculty member in the Department of Fisheries and Wildlife at Oregon State, where she studies fish dynamics, populations and life cycles. The deep-sea fishes are among the hardest to study for obvious reasons, she said, and additional research is critical to protect these species.

Long-lived fish usually have low reproductive rates, either because of low breeding success or high mortality. In the case of deep-sea fishes, both scenarios often play out.

In some species, such as sharks, the fish may only produce a handful of offspring and the chances of survival by an individual are low. In other species, including orange roughy and oreos, an individual fish produces thousands of eggs – most of which die through predation or starvation.

“One of the things we need to know more about is how the fish larvae get transported,” Heppell said. “We don’t know whether fish from different seamounts are genetically distinct or whether larvae from one seamount end up populating another. The odds against these fish are so high that, in a reproductive sense, they have to wait for the stars to align before they successfully produce offspring that will survive until maturity.”

Natural and human-influenced climate factors including El Niño, the Pacific Decadal Oscillation and hypoxia zones all can influence shallow-water fishes’ breeding and mortality rates, but deep-sea environments are usually stable. The deep sea is almost completely dark, very near freezing and has very little food – reasons for the fishes’ slow growth and low productivity.

“Old fish don’t necessarily need to breed every year,” Heppell pointed out, “so when nature throws a bad reproductive year at them, the species can survive. But the point remains that you have to have older fish to replenish the stock when those bad years come.”

Conversely, Heppell said, good years often can carry the population in a phenomenon known as “episodic recruitment.” In studies of long-lived fish species, it isn’t unusual to find a school with numerous 18-year-old fish, for example, but very few fish that are 17 or 19 years of age. Scientists can determine the age of fish through their otoliths, or ear bones, which regularly accumulate rings much like trees. Variations in the size of the rings can indicate ocean productivity that year.

Harvesting older fish lessens the likelihood of many productive breeding years, Heppell pointed out, and lengthens the time species need to recover.

“There are models that estimate the recovery time for some rockfish species is at least 200 years,” Heppell said. “And we still don’t know all of the factors that influence their survival.”

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Selina Heppell,
541-737-9039

Changes in West Coast Marine Ecosystems Significant, Scientists Say at AAAS

SAN FRANCISCO – The California Current system has experienced significant changes during the past decade, resulting in dramatic variations in the ecosystem characterized by shifts in phytoplankton production, expanding hypoxic zones, and the collapse of marine food webs off the western coast of the United States.

These changes, driven by new wind patterns, are consistent with predictive models of global climate change, scientists said this week at the annual meeting of the American Association for the Advancement of Science.

But the researchers stopped short of saying that climate change was the definitive cause.

“This coming year will be important,” said Jack Barth, a professor of oceanic and atmospheric sciences at Oregon State University. “If the persistent wind patterns of the last few years continue through 2007, it might be enough to tip the scales in favor of climate change as a cause for these extreme variations in our West Coast marine environment.

“Our research has shown there is a ‘wobble’ in the Jet Stream that in some years has tended to overpower the more historic day-to-day variations in climate in favor of these two- to three-week wind patterns that influence upwelling and ultimately, ocean production.”

Eight scientists, including five with ties to Oregon State University, are part of a AAAS symposium, “Predicting the Unpredictable: Marine Die-Offs along the West Coast.” This week, they outlined how marine ecosystems are responding to widely different climate-driven variables, beginning in 1997-98 with one of the most powerful El Nino episodes on record.

During that El Niño, ocean waters off the West Coast grew warmer, nutrients decreased, biological production was reduced, and species from zooplankton to salmon disappeared, were drastically reduced or moved from their typical habitats. The El Niño capped what had been a series of years through the 1990s characterized by warm waters and weak upwelling.

That regime ended abruptly in late 1998, and the California Current system entered a four-year period of cold ocean conditions, according to Bill Peterson, a NOAA oceanographer who works out of OSU’s Hatfield Marine Science Center in Newport, Ore.

The ecosystem response to this change, Peterson said, was immediate and dramatic.

“Zooplankton stocks more than doubled in biomass, and the zooplankton community structure suddenly changed to one dominated by cold-water, lipid-rich species,” Peterson said. “Salmon stocks rebounded immediately and the good conditions lasted for four years. But the cold-water period ended as quickly as it began, in late 2002, and the ecosystem began to revert to conditions seen during the 1990s.”

Before the change, however, the West Coast experienced an unprecedented invasion of sub-arctic water in the summer of 2002. This cold, nutrient-rich water triggered massive phytoplankton production in the surface waters, and as the organisms decayed and sank to the bottom, they sucked oxygen out of the lower water column, leading to hypoxia and marine die-offs.

And though the ocean waters warmed over the next four years, the West Coast experienced hypoxia events every summer, according to Francis Chan, a senior research assistant professor at Oregon State University.

“When it comes to upwelling and phytoplankton production, there can be too much of a good thing,” Chan said. “Although the low-oxygen zone has varied in intensity from year to year, 2006 saw an unexpected expansion and degradation in oxygen conditions. At least 3,000 square kilometers of the continental shelf along the Oregon coast were affected.

“This latest hypoxic event,” he added, “was off the charts.”

Nature threw a different wrinkle at the California Current system in 2005, when the spring upwelling was delayed by a month. Winds that normally cause upwelling were absent, creating the lowest “upwelling-favorable wind stress” in 20 years. Near-shore waters were two degrees (C) warmer than average, surf zone chlorophyll levels were 50 percent of normal, and nutrient levels were reduced by one-third. Changes in water movement, triggered by the wind shifts, had a drastic effect on mussel and barnacle larvae, which decreased by 83 and 66 percent respectively.

What this showed scientists is that changes to the system are multi-faceted. Large-scale changes have an imprint on the entire ecosystem, but there are surprises in local systems that may depend on the timing of winds as much as their overall strength and duration.

“We used to think we could look at the wind and predict runs of salmon,” Peterson said. “That’s not necessarily the case. It’s a lot more complex out there.”

OSU marine ecologist Bruce Menge said another lesson scientists have learned is that there are ecologic winners and losers during these climatic variations. The general perception that cold water cycles are good for the ocean may be true for the open ocean environment, he said, but they can disrupt near-shore communities such as kelp forests and rocky intertidal zones. And while El Niño events and warm water cycles lower ocean production in general, they also can boost near-shore food webs.

“I think what we’re seeing is that the Pacific Decadal Oscillation has shifted,” Menge said. “The 20- to 30-year cycles are becoming less prominent than these four-year cycles. What we don’t yet know is whether these last couple of four-year cycles are just blips, or the whole system has gone haywire.”

Oregon State University’s Jane Lubchenco, a co-organizer of the West Coast variability symposium and past president of the AAAS, said the bottom line is that the dramatic events of the past few years have shown how vulnerable our oceans are to changes in overall climate – and how quickly ecosystems respond.

“Wild fluctuations in the timing and intensity of the winds that drive the system are wreaking havoc with the historically rich ocean ecosystems off the West Coast,” Lubchenco said. “As climate continues to change, these arrhythmias may become more erratic. Improved monitoring and understand of the connection between temperatures, winds, upwelling and ecosystem responses will greatly facilitate capacity to manage those parts of the system we can control.”

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Jack Barth,
541-737-1607

Oregon teens to compete in annual Salmon Bowl Competition

CORVALLIS, Ore. - Eleven Oregon high school teams will test their knowledge of marine sciences on Saturday, Feb. 24, during the annual Salmon Bowl competition at Oregon State University.

The winning team will earn a trip to the national competition in Stony Brook, N.Y., in April. About 100 volunteers, including faculty, staff and students in the OSU College of Oceanic and Atmospheric Sciences, will help host the event as part of their effort to boost science literacy and interest in the world's oceans.

"As the public becomes more exposed to issues of global warming, low oxygen ‘hypoxia’ zones, declining fish stocks and harmful algal blooms, they become increasingly interested in the world’s oceans,” said Pete Strutton, a faculty member in the OSU college and an adviser for the Salmon Bowl. “The event is a fun way to help foster that interest among high school students.”

The public is invited to watch the Salmon Bowl, held on the OSU campus from 9 a.m. to 4:30 p.m. in Burt Hall, Wilkinson Hall, and the College of Oceanic and Atmospheric Sciences administrative building. All three facilities are located roughly at 26th Street and Monroe in Corvallis. Admission is free.

This statewide competition is part of the National Ocean Sciences Bowl, which aims to develop the next generation of marine scientists, policy makers, educators, explorers, researchers and advocates. It is organized by the Consortium for Oceanographic Research and Education, a group of 85 universities and aquaria, including OSU. More information is available at: http://www.nosb.org/

Last year's winning team, Neah-Kah-Nie, returns to defend its title.

Competing teams will tackle questions about the global carbon cycle, phytoplankton, ocean currents, tsunamis, undersea earthquakes, fisheries and climate change – to name just a few.

Care to test your own knowledge? Here’s one sample question: “The period for deep water circulation of the ocean is on the order of A) 10,000 years; B) 1,000 years; C) 200 years; or D) 10 years. The correct answer is “B.”

Another question: Which of the following is responsible for approximately 16 percent of global sulfur-based emissions? A) automobiles; B) large ocean vessels; C) power plants; or D) airplanes? Correct answer: “B.”

And finally, which ocean is the youngest among the Pacific, Atlantic, Indian and Southern oceans? If you came up with the Atlantic, you were correct.

"These students face some tough questions," said Coral Gehrke, a graduate student in OSU's College of Oceanic and Atmospheric Sciences, who is coordinating the event, along with Eleanor Hodak, another grad student. "Some of them are things that we are learning as graduate students – and some are based upon the research of our major professors at OSU, which is exciting.”

For more information on OSU's College of Oceanic and Atmospheric Sciences, visit the college website at: http://www.coas.oregonstate.edu/

Competing Salmon Bowl teams, individuals and coaches are listed below:

Astoria

  • Astoria High School Team A: Andrea Phillips, Alexandria Chandler, Alex Bonham, Elijah Knight, Colton Schwarz, Coach Lee Cain.
  • Astoria High School Team B: Elliot Leback, Christina Tweed, Maia Donachy, Kevin Speer, Jonathan Skillman, Coach Lee Cain.
  • Grants Pass

  • Hidden Valley High School: Chris Dunne, Max McClarnon, Ron Foster, Noah Bacon, Coach Wayne Brown.
  • Neah-Kah-Nie

  • Neah-Kah-Nie High School A&B Teams: Mikaela Atkinson, Sarah Aagesen, Stephanie Kosydar, Samantha Ferber, Laura Aravwen, Cameron DuBois, Josh DeGayner, Sean Compton, Kevin Filosi, Jared Haddock, Bryan Delgadillo, Coach Beth Gienger, Coach Peter Walczak.
  • Portland

  • Benson Polytechnic Team A: Nikesh Hajan, Tony Mac, Albert Le, Keenon Ono, Phuong Pham, Coach Dave Burmester.
  • Benson Polytechnic Team B: Vicki Lam, Eileen Tom, Logan Stowell, Tram Phan, Kim-Ngan Nguyen, Coach Matt Pellico.
  • Catlin Gabel High School: Laura Hays, Lucas Baker, Cole Perkinson, Kent Hays, Coach Lynda Jones.
  • Grant High School A&B Teams: Rachel Ostbergs, Casey Petry, Steven Stewart, Ashley Parker, Michelle Chu, Derrick Moten, Nancy Huynh, Gaedwyn Swails, Alex Luttman, Zen Pendragon, Coach Linda Driscoll.
  • Salem

  • South Salem High School: Michael St. Jacques, Teresa Anderson, Melanie Hunt, Sarah Perkins, Alicia Gorospe, Franziska Breyer, Ashley Taft, Coach Chad Rutan.
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    Pete Strutton,
    541-737-2065

     

    Hatfield Visitor Center hosts Fossil Fest Feb. 17

    NEWPORT, Ore. – In the days of the dinosaurs, ocean waves crashed on Idaho beaches. And long before that, in a time when armored fish plied ancient waters, the North American coastline was dotted by islands that would one day become eastern Oregon.

    Curious? How and why did the beach move to Newport? How is climate change recorded in beaches and fossils across Oregon? These are among the topics to be presented at Oregon State University’s Hatfield Marine Science Center in Newport during the annual Fossil Fest, Saturday, Feb. 17.

    Ellen Morris Bishop, of the Oregon Paleo Lands Institute, will tell the moving-beach story at 11 a.m.; at 1:30 p.m., William Orr of the University of Oregon will give an illustrated presentation on fossil insects, which he terms “a most improbable happenstance."

    Both Morris Bishop and Orr will also be on hand to identify fossils brought in by visitors.

    In addition, representative fossils from the local Astoria and Nye formations (15-20 million years ago) will be on display. Other table displays will include local fossils collected by Guy DiTorrice and fossils from both Oregon and Washington collected by the North America Research Group.

    Hands-on activities include a fossil swap, in which visitors can trade their extra fossils, and the chance to grow-your-own fossil, using seeds of Oregon's new official State Fossil, a Metasequoia tree. And children will enjoy sifting through an archaeological collection for Bone Valley fossil shark teeth.

    “Kids will get to screen for these and keep two or three that they find,” said Bill Hanshumaker, Sea Grant marine educator at the HMSC Visitor Center.

    A field trip or two is also in the offing. From noon to 1:30 p.m., the Oregon Paleo Lands Institute will lead a trip to explore the coastal outcrops of Columbia River basalts in Yaquina Head and pillow lavas at Depoe Bay. These two very different kinds of lavas underlie the coast, and fossils might even be discovered on the trek, said Hanshumaker. Weather and light permitting, the trip will repeat at 3 p.m.

    The Visitor Center opens for Fossil Fest at 10 a.m. and closes at 5 p.m.

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    Bill Hanshumaker,
    541-867-0167

    OSU graduate helping out as a legislative fellow

    CORVALLIS, Ore. - How does knowledge matter in politics? Oregon Sea Grant’s new legislative fellow, Ephraim Temple, is in the process of finding out.

    Throughout the 2007 Oregon legislative session, Temple, who recently completed an Oregon State University graduate degree in fisheries and wildlife (with a minor in marine resource management), is offering technical expertise on marine and coastal issues to legislators. He works specifically with the bipartisan Coastal Caucus.

    At the same time, he’s learning about the legislative process and is developing the skills to work with various levels of Oregon government and with private and state resource organizations. Temple is hosted by Rep. Deborah Boone of Cannon Beach, chair of the Coastal Caucus.

    While Temple’s master’s degree has equipped him with the latest academic perspectives on coastal issues, he also brings real-world experience from living in Hawaii, Tonga, Australia, and California, as well as Oregon since 2004. He’s worked on coastal policy issues, knows his way around a conversation with both fishermen and resource managers, but the legislature is something new.

    When the fellowship is over at the end of this session, Temple will produce a scholarly report to the sponsoring organization, Sea Grant, analyzing the progress and final outcome of marine and coastal issues dealt with during the session.

    Oregon Sea Grant, based at OSU, has been supporting the legislative fellowship since 1987.

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    Jay Rasmussen,
    541-867-0368

     

    OSU’s Mate, Marine Mammal Institute featured in new documentary

    NEWPORT, Ore. – The pioneering work of Oregon State University researcher Bruce Mate and OSU’s Marine Mammal Institute will be featured in a new documentary filmed by the British Broadcasting System and airing on the Animal Planet network on Monday, Feb. 5.

    The show, part of the network’s Incredible Animal Journeys series, features the tracking of gray whale females and their offspring from calving areas off Mexico to feeding grounds in the high Arctic.

    Mate has been a pioneer in the use of satellites to track tagged whales over his last two decades of research that has yielded a wealth of information about the animals’ migration routes between feeding and calving areas, as well as their overall behavior. This recent OSU project, filmed in 2005, documents the first tracking of gray whales from their calving areas to feeding areas.

    The work is important because it shows how whales migrate in close proximity to human activities and how their feeding areas have changed in recent years in response to warming in the Bering Sea.

    “Even though we were tracking the tagged whales by satellite, it turned out to be incredibly difficult to locate those specific whales during their migration for the filming crews,” Mate said. “Whales are difficult to tell from one another, unless we get really close to them, and weather frequently kept us from making a timely rendezvous with the tagged individuals.

    “At one point, we had an airplane, two boats, and a person located on a hillside with a direction finder looking for our whales,” Mate added with a laugh. “But it worked out well in the end. The research was significant and the exposure for Oregon State University and our new institute is tremendous.”

    The OSU researchers tagged 17 gray whales during the project. Six of those animals lost their tags even before the whales left their wintering lagoon – probably because the one-ton calves frequently rub against their mothers. One tag was lost when the whale was temporarily entangled in a gill net in Mexico, one whale died of unknown causes (not related to the tag), and one was killed during a Russian whale hunt.

    “It’s a rough world out there for whales,” Mate said, “and both the research and the documentary demonstrate that.”

    The gray whale episode of Incredible Animal Journeys is scheduled to debut at 8 p.m. (Pacific time) on Feb. 5 on the Animal Planet network, and will be replayed several times over subsequent weeks.

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    Bruce Mate,
    541-867-0202

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    Scientists’ study of Antarctic seals may lead to insights on aging

    NEWPORT, Ore. – A team of scientists has just returned from McMurdo Sound in Antarctica, where they have been analyzing the diving and oxygen-carrying capacity of aging Weddell seals in a study that may shed new light on aging and possible protective mechanisms.

    The study is unusual because its focus is on older animals and how they retain their ability to hunt for food and reproduce despite a lifetime of seemingly debilitating physical exertion.

    “Weddell seals have well-known compensatory mechanisms that allow them to routinely swim underwater while holding their breaths for 30 minutes to an hour,” said Markus Horning, a researcher with the Marine Mammal Institute at Oregon State University and principal investigator on the study. “Such diving behavior is likely to result in periodic hypoxia – or low levels of oxygen – in some tissues, especially swimming muscles.

    “When a mammal’s system is suddenly re-oxygenated after hypoxia, it is likely to create high levels of reactive oxygen species that are implicated in aging and can cause damage to cells, as happens to mountain climbers and other extreme athletes,” Horning added.

    Since diving animals routinely experience reoxygenation when breathing at the surface following a dive, the researchers expected to find that Weddell seals would exhibit fairly rapid aging. But few such signs appeared.

    “Older seals appear to be diving quite well and have no trouble feeding or reproducing,” Horning said. “Their only apparent sign of aging was some wear and tear on their teeth. If aging occurs, then it will happen at the level of organs and tissues, while the whole organism still remains quite functional.”

    Horning said these findings suggest that Weddell seals have a compensatory or protective mechanism – either physiological or behavioral – that reduces the impact of possible oxidative stress.

    This was the first of two field seasons for the researchers in the study, funded by the National Science Foundation. Horning, who also is an assistant professor of fisheries and wildlife at OSU, worked with co-principal investigator Jo-Ann Mellish, from the University of Alaska-Fairbanks.

    McMurdo Sound Weddell seals are an ideal species for this aging study, Horning says, because almost all of them have been tagged, documented and identified as individuals by researchers since the 1970s and the ages of those individuals are well-established. An added benefit is that this particular group of seals rarely strays beyond the sound, sealed in by the sea ice, creating a natural laboratory.

    During the recent December 2006 field study, the researchers collected small blood and muscle samples from seals. They also applied recording devices to the seals’ fur to monitor their diving depth, swimming speed and flipper movement, while also recording electro-cardiograms (EKGs). They were able to determine how long these large seals – which weigh 500 to 1,300 pounds – would maintain their dives, how frequently they summoned up bursts of energy, and what their recovery rate was from an exerting dive.

    What they discovered was a fascinating physiological response by the seals. When diving, the animals reduced the flow of blood to many of their organs including their skin, liver and kidneys, while keeping their hearts, brains and swimming muscles supplied with blood and oxygen. They reduced their heart rate from about 100 beats per minute down to 40 beats – and sometimes as low as five per minute – to adjust blood output from the heart to this reduced circuit.

    “This ability demonstrates the remarkable capacity of seals to manipulate their physiology and metabolism, and to adjust to extreme circumstances,” Horning said. “One of our next steps is to compare how older animals adapt their blood flow and heart rate and compare it to younger animals. That may be one area where the older seals may exhibit compensatory mechanism to reduce the impact of reduced muscle performance.”

    The scientists theorize that the seals’ compensatory process could come in a couple of different ways. One possibility is that their “plasticity,” or range of physical behavior, is so wide that efficient dives fit within their physical abilities – even with declining muscle performance at an advanced age. Or they could have highly active anti-oxidant enzymes, or “scavenging systems,” that remove the reactive oxygen species as they form, reducing oxidative stress and slowing the decline in muscle performance.

    “It’s also possible there is a combination of both ideas,” Horning said. “They may have a wide behavioral plasticity and physiological protective mechanisms to reduce the damage.”

    If the seals do have enzyme-powered scavenging systems that help them compensate, it could have implications for understanding how humans might deal with oxidative stress and related aging.

    Horning says the study should also help researchers fine-tune population models for different marine mammal species in addition to Weddell seals. Many of the current models, he says, may not accurately reflect the continuing role of aging adults.

    “A lot of these seals are 25 to 30 years old,” Horning said, “and they are still actively hunting for food and reproducing and showing little negative effect.”

    Media Contact: 
    Source: 

    Markus Horning,
    541-867-0270

    Multimedia Downloads
    Multimedia: 

    sealrecover1
    Markus Horning (left) checks the gums of a Weddell seal as part of a National Science Foundation-funded study on aging, while other researchers draw blood samples and prepare for other tests. The seal recovered rapidly and was released. (photo courtesy of Oregon State University)

    sealrecover2
    Part of the research team leaves a Weddell seal to recover and focuses on removing equipment and other gear before the ice melts. (photo by Markus Horning, OSU)

    Markus Horning
    Markus Horning

    Public Forums on Marine Reserves Set in Eight Coastal Communities

    CORVALLIS, OR. – A series of “listening and learning” forums in eight communities up and down the Oregon coast this month will seek to gather a wide range of interests and viewpoints surrounding the issue of marine reserves.

    The forums, starting in North Bend on Feb. 18, are being organized by Oregon Sea Grant, a marine research and outreach program based at Oregon State University, at the request of the state's Ocean Policy Advisory Council (OPAC).

    As defined by OPAC, marine reserves are areas of the ocean closed to fishing and other extractive activities "in order to conserve marine habitats and biodiversity to provide reference areas for research and monitoring." Oregon Gov. Ted Kulongoski has asked OPAC to come up with a set of recommendations for establishing fewer “than 10 marine reserves – large enough for scientific testing but small enough to avoid economic or social impacts such as the loss of significant fishing opportunities.”

    OPAC members asked Sea Grant to conduct the community outreach process because of the program's 40-year history of engaging with coastal communities on issues as wide-ranging as fisheries management, coastal hazards and regional research planning.

    The forums are intended to engage coastal communities and ocean users, share scientific and local knowledge, and show people how they can continue to be involved in the process of nominating potential sites for marine reserves.

    Forums will be moderated by Ginny Goblirsch, a long-time Sea Grant Extension agent with both professional and personal background in the fishing community. Goblirsch, who lives in Newport, was brought out of retirement to coordinate the outreach effort.

    Scientific background on marine reserves will be presented by Patty Burke, marine resources manager for the Oregon Department of Fish and Wildlife, and Selina Heppell, a faculty researcher with the OSU Department of Fisheries and Wildlife.

    Participants will hear “what and why” background about marine reserves, receive copies of material OPAC intends to use to make its recommendations, and meet others with whom they may continue working on the issue after the forums.

    Targeted participants include:

    • Commercial, charter, and recreational fishermen;

    • Seafood industry and fishing support services;

    • Port commissioners and managers;

    • Community conservation leaders;

    • Coastal recreation interests;

    • Local government and staff;

    • The public at large.

    Those planning to attend the two-hour forums are encouraged to prepare in advance by visiting http://seagrant.oregonstate.edu/outreach/reserves.html and reading the background documents provided there by OPAC. Print versions of the documents will also be available at the offices of local ports.

    To ensure that their knowledge, ideas and perspectives are considered in the decision-making process, participants are also urged to bring written comments to turn in at the forums.

    All forums will take place from 6:30 to 8:30 p.m. at the following dates and places:

    • Feb. 18: North Bend Community Center, 2222 Broadway, North Bend

    • Feb. 20: Garibaldi City Hall, 107 6th St., Garibaldi

    • Feb. 21: Newport City Hall, 169 SW Coast Hwy, Newport

    • Feb. 22: Florence Events Center, 715 Quince St., Florence

    • Feb. 26: Port of Umpqua, 364 N 4th St., Reedsport

    • Feb. 27: Chetco Grange Community Center, 97895 Shopping Center Ave, Harbor

    • Feb. 28: Port Orford City Hall, 555 W 20th, Port Orford

    • Feb. 29: Warrenton Community Center, 170 SW 3rd St, Warrenton

    Residents of surrounding communities are encouraged to attend the forum nearest to them.

    Sea Grant is under a mid-March OPAC deadline to conduct these and other listening and engagement activities and deliver an interim outreach report to the Kulongoski, OPAC, and state agencies involved in the marine reserves process. One possible outcome could be the formation of local nearshore working groups to further study the issue and, if they choose, nominate areas in their regions as potential marine reserves.

    For more information, contact Ginny Goblirsch at 541-737-8002, or by e-mail to marinereserves@oregonstate.edu

    Media Contact: 
    Source: 

    Ginny Goblirsch,
    541-737-8002