Tag Archives: Chinook salmon

Lights could be creating problems for salmon, seabirds and more

Bright lights that affect the behavior of birds, fish and other wildlife are emerging as a significant environmental concern.

Endangered Hawaiian Petrel
Photo: B. Zaun, U.S. Fish and Wildlife Service

Yesterday, for example, two environmental groups filed a lawsuit against the Hawai’i Department of Transportation for bright lights the agency controls at piers and airports. The groups say three species of seabirds on the Endangered Species List have been circling the lights until the birds drop from exhaustion, and some birds have died.

Meanwhile, in Lake Washington and the nearby Cedar River in King County, there is evidence that threatened chinook salmon are at greater risk from predators because of lights on the two floating bridges as well as industrial facilities in Renton.

In Florida, researchers have discovered that female turtles avoid coming ashore to lay their eggs where bright lights are present, and in Virginia salamanders have delayed their feeding efforts in the glare of lights.

The lawsuit in Hawaii was filed by lawyers for Earthjustice out of concern for three species of seabirds: Newell’s shearwater, a threatened species, and Hawaiian petrels and band-rumped storm petrels, both endangered species.

The Hawai’I Department of Transportation has failed to protect the birds, as required by the Endangered Species Act, according to the lawsuit filed on behalf of the Hui Ho‘omalu i Ka ‘Āina, Conservation Council and the Center for Biodiversity. Because the lighting is injuring and killing listed species, the state agency must obtain an incidental take permit and initiate actions to minimize harm, the lawsuit says. For details, see the complaint for declaratory and injunctive relief (PDF 1.4 mb).

Lights at airports and harbor facilities have been documented as the greatest source of injury and death to the seabirds, which migrate at night and become disoriented by the artificial lights, the complaint asserts. Some birds crash into buildings, while others end up on the ground where they may be struck by vehicles or eaten by predators.

Since the 1990s, the Newell’s shearwaters have declined by 94 percent and the Hawaiian petrels on the island of Kauai have dropped by 78 percent.

“Our ancestors depended on the ‘a‘o (Newell’s shearwater), ‘ua‘u (Hawaiian petrel) and ‘akē‘akē (band-rumped storm-petrel) to help locate schools of fish, to navigate from island to island and to know when the weather is changing,” Kauai fisherman Jeff Chandler was quoted as saying in a news release from Earthjustice.

According to the news release, the Department of Transportation dropped out of talks with state and federal wildlife agencies that are developing a habitat conservation plan to protect the seabirds. After Earthjustice filed a notice of intent to sue, the agency rejoined the talks.

“That’s a good start, but talk alone will do nothing to save these rare and important animals from extinction,” said Earthjustice attorney David Henkin. “It’s long past time for the department to take action, not only on Kauai, but everywhere in the state that its operations illegally kill seabirds.”

Lake Washington chinook

As for the lights on and around Lake Washington, I have not heard of any proposed lawsuits to protect the threatened Puget Sound chinook, but concerns continue to simmer.

Lights on the Highway 520 bridge
Photo: Washington Dept. of Transportation

Jason Mulvihill-Kuntz, salmon recovery manager for the Lake Washington/Cedar/Sammamish Watershed, told me that the next regional chapter of the chinook recovery plan will call for further study into the effects of lights on juvenile chinook migrating down the Cedar River and through Lake Washington.

“The technical folks have identified light as a potential emerging issue,” Jason said. “We don’t have a good handle on what the impacts are.”

Lights on Lake Washington may be creating a double whammy for young chinook, Jason said. First, the lights attract the fish, which slow down their migration to Puget Sound. Second, the lights keep them visible to predators at night, so the fish may be eaten 24 hours a day.

“Juvenile salmon don’t have a nighttime respite,” Jason said. “At least that’s the hypothesis.”

Nonnative predatory fish include bass, walleye and northern pike. Native predators include cutthroat trout and pike minnow. Predatory birds include the western grebe and great blue heron.

An updated chinook recovery plan for the Lake Washington region is under review and could be finalized this fall. Predation is getting some additional attention this time around, Jason said, and the issue of lights is something that needs more study.

Experts at the U.S. Fish and Wildlife Service have identified potential concerns with lighting along Lake Washington in a series of studies going back more than 10 years. It still isn’t clear, however, how much the known problems with predators are exacerbated by bright lights. That’s why more studies are needed.

Following complaints from residents of Laurelhurst near the Highway 520 bridge, the Washington Department of Transportation reduced the amount of illumination coming off that bridge, and further investigation is underway. Check out the King-5 News report below.

Other species

With regard to other species, lights are known to have a variety of effects. Reporter Sharon Guynup outlined the problems for birds, turtles, amphibians, mammals and even insects in a revealing story in National Geographic News, April 17, 2003.

A group of British researchers from the University of Exeter compiled a list of the known effects of light on various species while considering the role of artificial lighting. See “The ecological impacts of nighttime light pollution; a mechanistic appraisal” in Biological Reviews.

Facing challenges that could save chinook salmon from extinction

Nineteen years ago this month, then-Governor Gary Locke made a bold declaration about salmon that would echo through time: “Extinction is not an option.”

Juvenile chinook salmon depend on high-quality habitat for their survival.
Photo: U.S. Fish and Wildlife Service.

It was a call to action that would lead to major protection and restoration efforts throughout Puget Sound. Still, today, chinook salmon have not experienced a population rebound, as many people had hoped. The failure to thrive has been a disappointment to many, yet we are often reminded that it took 150 years to push salmon to the brink of extinction and it will not be easy to ensure their future.

Last week, concerns about the survival of chinook salmon prompted a coalition of Puget Sound tribes to propose a series of “bold actions,” as I reported in the Encyclopedia of Puget Sound, later reprinted in the Kitsap Sun.

“The way we are managing lands is not working,” stated salmon expert Dave Herrera, speaking for the tribes. “It may be working for people, but it is not working for fish.”

The bold actions, spelled out in a three-page proposal (PDF 380 kb), include greater controls on the use of land and water, among other things. I won’t describe the details, which you can read in the memo. The ideas were prompted by a new Chinook Salmon Implementation Strategy, designed to accelerate an increase in the Puget Sound chinook population.

The tribes complained that the proposed strategy, as drafted, mostly mimicked the 10-year-old Puget Sound Salmon Recovery Plan. That plan has made limited progress in restoring wild salmon runs, despite millions of dollars spent to protect and restore habitat while limiting fishing and controlling hatchery production.

In his speech of June 1998, Gov. Locke worried about the risk of extinction for these migratory fish, which are an economic asset as well as a celebrated symbol of the Northwest.

Former Gov. Gary Locke

“In several Puget Sound watersheds, our wild salmon have less than a decade to live, unless we act now,” Locke said in 1998. “And in many more rivers and streams, if the status quo continues, our wild salmon will be gone before my daughter Emily graduates from high school. So we just don’t have any time to waste. For better or for worse, we are about to make history.”

Locke’s speech was indeed historic, as he launched an unprecedented endeavor to rebuild salmon runs at great financial cost. The governor seemed to understand the challenge, as I noted at the time in my coverage of the speech before more than 100 county officials in Tacoma:

“Locke appears to be glancing over his shoulder, ready to duck for cover, as he talks about the financial and political commitments required to keep salmon from disappearing in various parts of the state,” I wrote.

“We need to wake up every morning ready to challenge the status quo,” Locke said, adding that basic changes are needed in the way businesses and average citizens use their land and water resources.

“There is a risk,” Locke said, “in just delivering that message, let alone acting on it.”

The following year, the Washington Legislature created the Salmon Recovery Funding Board to prioritize state and federal funding for salmon recovery. And the next governor, Chris Gregoire, ushered in an even greater ecosystem-recovery effort under guidance of the Puget Sound Partnership.

Wetlands are critical habitat for salmon.
Photo: Eric Grossman, U.S. Geological Survey

Today, I can’t help but wonder what would have happened without these salmon- and ecosystem-recovery efforts. Would the salmon be gone, as Locke predicted? It’s hard to say, but researchers have learned a great deal about what salmon need to survive, and the money is being better targeted toward those needs. As a result, it is understandable why some people are both disappointed with the past and hopeful for the future.

One of the great challenges facing public officials today is to find ways for local governments to truly live up to the standard of “no net loss” of ecological function — a standard required by the state’s Growth Management Act. When new developments affect “critical areas” — such as fish and wildlife habitat — they must include vegetated buffers and stormwater controls to minimize the damage. Then they must enhance degraded habitat — either on-site or off-site — to make up for losses that cannot be avoided.

I used to believe that this goal was unachievable, and I have questioned many state experts about it. How can any developer construct a commercial or residential development and walk away with no net loss of habitat function? The answer is to include a serious restoration component.

One example is the Hood Canal Coordinating Council’s In-Lieu Fee Program, which I wrote about last month in Water Ways (May 19). This program was started on a large scale to mitigate for construction at the Navy’s submarine base at Bangor, but it also works on a small scale, as I mentioned in that blog post.

When an older site is redeveloped, there may be no ecological loss, since the damage was done in the past. But when a developer builds in a new location, the local government is charged with measuring the loss, coming to terms for mitigation and making sure the mitigation is carried out. The concept of “no net loss” works only if the mitigation is permanent — another major challenge in many areas.

If no net loss can be achieved while major restoration efforts continue, we will see a net increase in salmon habitat in the Puget Sound region, and that will be a cause of celebration. One success has been in the program Floodplains by Design, which improves critical off-channel habitat for salmon while reducing flooding problems for nearby residents. Checkout the story I wrote for the Encyclopedia of Puget Sound and the blog post in Water Ways, April 15.

Washington State Department of Commerce, which oversees the Growth Management Act, is in the process of updating its Critical Areas Assistance Handbook (PDF 6 mb), which serves as guidance for local regulations. New information about how to protect habitat for all life stages of salmon will be a key addition to a revised version, soon to be released for public review. See the CAO page on the Department of Commerce website.

Local governments in every part of the state must become part of the discussion if we expect them to carry out the mandate of protecting habitat for salmon. Money for planning and regulatory enforcement must be worked out. One idea I’ve heard is a regional approach that involves a group of compliance officials working to enforce the rules for multiple counties and cities.

No doubt the salmon-recovery effort must be improved. Challenges remain for issues including fishing, predation by marine mammals and climate change. But if the protection and restoration of salmon habitat can outpace unmitigated damage from development, we may be justified in believing that extinction is not an option.

Seals and sea lions may be undercutting chinook and orca populations

Seals and sea lions can no longer be ignored in the effort to recover our threatened Puget Sound chinook salmon or our endangered killer whales.

A new study shows that seals and sea lions are eating about 1.4 million pounds of Puget Sound chinook each year — about nine times more than they were eating in 1970, according to the report. Please read the story I wrote for the Encyclopedia of Puget Sound, also published in an abridged version in the Kitsap Sun.

Harbor seals rest on the breakwater at Poulsbo Marina. // Photo: Meegan Reid, Kitsap Sun

Seals and sea lions in Puget Sound get the first chance to catch the chinook as they leave the streams and head out to the ocean. Since they are eaten at a very young age, these small chinook, called “smolts,” never grow into adults; they never become available for killer whales or humans.

Based on rough estimates, as many as one in five of these young fish are getting eaten on their way out of Puget Sound. If they were to survive the seals and sea lions and one factors in the remaining mortality rate, these fish could translate into an average of 162,000 adult chinook each year. That’s twice the number eaten by killer whales and roughly six times as many as caught in Puget Sound by tribal, commercial and recreational fishers combined, according to the study.

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Experts agree: Coho fishing must be reduced this year to save species

Fishing seasons for coho salmon in Puget Sound are expected to be cut back severely this year, as the latest forecasts of salmon returns predict that coho runs will be less than a third of what was forecast for 2015.

Salmon managers faced some tough facts recently when they read over results from a computer model used to predict the effects of various fishing scenarios. After they plugged in last year’s fishing seasons and this year’s coho forecast, the computer told them that essentially no fish were left to spawn in Stillaguamish River in northern Puget Sound. Things were hardly better for the Skagit or Snohomish rivers or for streams in the Strait of Juan de Fuca and Hood Canal.

Coho forecast

“With last year’s fisheries, you will catch every fish out there,” said Doug Milward, who manages salmon data for the Washington Department of Fish and Wildlife. “All the fisheries will have to change to protect the Stillaguamish (coho) — from the ocean fisheries to inside (Puget Sound).”

Last year’s fishing seasons are not even a good starting point, as negotiations begin between salmon managers for the Washington Department of Fish and Wildlife and Western Washington tribes. Under federal court rulings, the two sides must agree on fishing seasons, and the goal remains a 50-50 split of the various stocks that can be safely harvested. NOAA Fisheries plays a role in setting seasons for chinook, which are listed as threatened under the Endangered Species Act. Coho are not listed, although some people argue that they should be.

2015 coho returns

By April 14, if things go as planned, the two parties will reach agreement on when and where salmon fishing will take place — for tribal and nontribal, sport and commercial fishers.

“Unfavorable ocean conditions led to fewer coho salmon returning last year than we anticipated,” John Long, salmon fisheries policy lead for WDFW, said in a news release. “We expect to see another down year for coho in 2016 and will likely have to restrict fishing for salmon in a variety of locations to protect wild coho stocks.”

It seems the tribes have a slightly different take on the situation.

2016 coho forecasts

“There likely will be no coho fisheries in Western Washington this year, as returns are expected to plummet even further than last year because of poor ocean survival,” Lorraine Loomis, chairwoman of the Northwest Indian Fisheries Commission, stated in a column published online.

She said that when last year’s coho returns are finally tallied, they may be as much as 80 percent below preseason forecasts. The Nisqually Tribe last year canceled its coho fishery when less than 4,000 of the anticipated 23,000 fish returned to the area, she said.

Tribes fish at the end of the line, after all the other fisheries — from up the West Coast to the inside of Puget Sound. Because the treaties require tribes to fish within their “usual and accustomed areas,” agreements on fishing seasons must allow for salmon to return to their natal streams with numbers large enough for tribes to take their share, Lorraine said.

“Every year we must wait and hope that enough fish return to feed our families and culture,” she said. “Faced with low catch rates last year, however, most tribal coho fisheries were sharply reduced or closed early to protect the resource. The state, however, expanded sport harvest in mixed stock areas last year to attempt to catch fish that weren’t there. That’s not right. The last fisheries in line should not be forced to shoulder most of the responsibility for conserving the resource.”

Chinook forecast

The annual negotiations between the state and the tribes were kicked off Tuesday at a public meeting where the salmon forecasts were discussed with sport and commercial fishers.

In addition to a poor return of coho to Puget Sound, the forecast for Puget Sound chinook also shows somewhat lower numbers than last year.

One bright spot is for people who like to fish in the ocean. About 951,000 fall chinook are expected to return to the Columbia River. That’s higher than the 10-year average but lower than last year’s modern record of 1.3 million. About 223,000 hatchery chinook are expected to return to the lower Columbia River. These fish, known as “tules,” make up the bulk of the recreational harvest.

2015 chinook returns

Another bright spot is the prediction of a fair number of sockeye returning to Baker Lake on the Skagit River, possibly allowing a fishing season in the lake and river.

Norm Reinhardt, who heads up the Kitsap Poggie Club, has been involved in advisory groups on salmon fishing and participates in discussions about the seasons.

“This year, we have a significant challenge in the coho fishery, and we will have to base decisions on conservation needs,” Norm told me following Tuesday’s meeting.

Despite lower chinook numbers, there could be ways to work out some opportunities to fish for hatchery chinook, he said. Catch-and-release is one option on the table, but it is not popular among sport fishers.

2016 chinook forecast

Anglers are still smarting from last year’s sport-fishing closure in Area 10, a designated fishing area between Bremerton and Seattle. Fishing for chinook was prohibited in that area at the insistence of the Muckleshoot Tribe to protect hatchery chinook returning to the Issaquah Creek hatchery.

Fishing should have been allowed at some level — with the release of wild chinook — under an agreed management plan, Norm says, but state managers yielded to the tribe at the last minute in order to hasten a final agreement. On Tuesday, Norm told state salmon managers that he doesn’t want to see that happen again.

“In area 10, our argument is going to be that if we have adequate chinook, we should be allowed to fish on our fish — unlike last year,” he said.

sockeye forecasts

The reduced number of coho returning to Puget Sound has been blamed on ocean conditions, including higher water temperatures off the coast and a mass of warm water called “the blob,” which stayed around for two years. Studies have shown that warmer water alters the species of plankton available for fish to eat. The result is that the fish are consuming a plankton lower in fat content, causing coho to be thinner and fewer.

The 2016 forecast of about 256,000 Puget Sound coho is about 40 percent of the average return over the past 10 years and 29 percent of the number predicted for 2015 — a prediction that turned out to be too optimistic. Because of the failed coho forecast last year, everyone is expected to be more cautious about aspects of the computer modeling this year.

Charts on this page were presented during Tuesday’s meeting. The new charts make the presentation easier to understand, compared to the tables of data discussed at previous meetings. The data tables are still available when one needs to dig into the finer details. The new maps use colors to describe how streams are doing. Poor (red) is if the run or forecast for a stream is less than 75 percent of the 10-year average. Good (green) is if the run or forecast for a stream is more than 125 percent of the 10-year-average. Neutral (blue) is if the run or forecast falls between 75 percent and 125 percent.

Anyone may attend the meetings where the ongoing negotiations and possible tradeoffs are discussed. Allowing more fishing in one place often results in less fishing somewhere else, and there’s always the question about whether enough salmon are being left for spawning in the streams.

“We’re going to have to be creative in order to provide fisheries in some areas this year,” John Long said. “We would appreciate input from the public to help us establish priorities.”

Information about the salmon forecasts, the meeting schedule and methods of commenting are available on WDFW’s North of Falcon website.

On March 14, various parameters for ocean fishing will be set by the Pacific Fishery Management Council, a group empowered by the federal government to manage fish in the ocean. The PFMC will adopt ocean fishing schedules and harvest levels during its April 8-14 meeting, at which time state and tribal salmon managers are expected to approve fishing seasons for the inland waters.

Carl Safina explores animal culture plus
orca-salmon links

Carl Safina — scientist, teacher, author and documentary filmmaker — will speak Wednesday on a topic of interest to many killer whale observers, “Intertwined Fates: The Orca-Salmon Connection in the Pacific Northwest.”

The talk, sponsored by the group Orca Salmon Alliance, will be held at the Seattle Aquarium, but it appears the event has been sold out. (Brown Paper Tickets)

Following his speech, Safina will join a panel of experts on salmon and killer whales to discuss the connections between these two iconic species and what it will take for the survival of the species. The experts are Ken Balcomb of the Center for Whale Research, Jacques White of Long Live the Kings, Howard Schaller of the U.S. Fish and Wildlife Service and Lynne Barre of NOAA Fisheries.

Safina’s newest book, “Beyond Words: What Animals Think and Feel,” is winning acclaim for its description of animal culture and even emotions in creatures such as elephants, wolves and killer whales.

“We have long asked whether we are alone in the universe, but clearly we are not alone on earth,” wrote Tim Flannery in his review of “Beyond Words” in the New York Review of Books. “The evolution of intelligence, of empathy and complex societies, is surely more likely than we have hitherto considered. And what is it, exactly, that sets our species apart? We clearly are different, but in light of ‘Beyond Words’ we need to reevaluate how, and why.”

“Safina comes to an unfamiliar but empirically based conclusion,” Flannery continues. “Prior to the domestication of plants and the invention of writing, the differences between human societies and those of elephants, dogs, killer whales, and dolphins was a matter of degree, not kind. Why, he asks, has it taken us so long to understand this?”

Previously, in a PBS series “Saving the Ocean,” Safina explored the effort to restore chinook salmon to the Nisqually River. During a two-part segment, he interviewed numerous biologists and talked to tribal leader Billy Frank before Billy’s untimely death.

The newly formed Orca Salmon Alliance is a consortium of environmental groups focused on supporting the recovery of orcas and salmon. Proceeds from Wednesday’s event will support the organization.

“We can’t recover the highly endangered population of orca living off the Northwest coast without also restoring their primary food source, the chinook salmon,” said Deborah Giles, Science Advisor for OSA.

Salmon managers reduce Puget Sound fishing
to protect chinook

I missed the annual trek to Olympia this year to meet with state and tribal salmon managers, recreational and commercial fishermen and others involved in setting fishing seasons. The event, held in March, is both a reunion and the official start of some serious talks about salmon.

Each year, fishermen head to the Skokomish River to catch chinook that have made it all the way through Hood Canal. This year, more restrictions are in store. Kitsap Sun file photo
Each year, fishermen head to the Skokomish River to catch chinook that have made it all the way through Hood Canal. This year, more restrictions are in store.
Kitsap Sun file photo

I’ve always enjoyed the discussions about the number of various salmon stocks expected to return to diverse areas of Puget Sound, the Washington Coast and the Columbia River. Years ago, I observed much more horse-trading — or rather salmon-trading — as experts made decisions about how far inland the fish should be allowed to swim before being caught.

Saving enough fish to make it back to the streams to spawn has always been the goal of the negotiating process, known as “North of Falcon” — so named because the discussions are focused on an area north of Cape Falcon in Oregon. I have to say, however, that the discussions began to change after Puget Sound chinook were declared “threatened” under the Endangered Species Act and conservation measures became even more important.

Chinook recovery has not been going well, even after major reforms in harvest management, hatchery operations and habitat restoration. So the need to protect the salmon from fishing pressures grows ever greater and the opportunities to catch fish in particular areas continue to decline.

Such was the case this year, when salmon managers decided to forego fishing for chinook in the popular fishing area known as Area 10 between Bremerton and Seattle. Other salmon can still be caught there, but all chinook — even those reared in a hatchery — must be released.

I was not around to observe how the negotiations went this year, having retired from the staff of the Kitsap Sun in October. (I’m now doing some in-depth reporting for the Sun and currently covering the Legislature for InvestigateWest.) It appears that recreational and commercial fishers believe that the salmon managers could have carved out some fishing seasons in the area without risking survival of the species.

“We fought hard just to keep what we had last year, and then to get the rug pulled out from under us is totally incomprehensible,” said Tony Floor of the Northwest Marine Trade Association, quoted in a story by Seattle Times reporter Mark Yuasa.

“With increasing (licensing) fees and the declining fishing opportunities, it makes it really difficult,” said Karl Brackmann, a Puget Sound Anglers board member, quoted in a story by Kitsap Sun reporter Tristan Baurick.

Even though sophisticated computer models try to determine how many salmon will be coming back to a given area, it’s still a guess. Deciding how many fish can be safely caught is always a judgment call. I guess this year managers have concerns not only for the wild chinook but also the marked hatchery chinook. The hatchery chinook, marked by removing the adipose fin, are normally considered free for the taking as long as unmarked wild chinook are released.

Lorraine Loomis, chairwoman of the Northwest Indian Fisheries Commission, said fishing reductions were especially painful for tribal and state managers this year, but the cutbacks were necessary. Salmon returns were poor last year, she said, and managers were concerned about ocean conditions and a low snowpack that could lead to increased stream temperatures.

“Because of these conditions we may see an increase in pre-spawning mortality of salmon this year, which required the tribal and state co-managers to be extra cautious in setting seasons,” Loomis said in a news release.

Anglers will still have good opportunities to catch coho, pink and Skagit River sockeye, according to Ryan Lothrop, Puget Sound recreational fishery manager for the Washington Department of Fish and Wildlife.

“Fishing for pink salmon should be excellent in Puget Sound, including in Hood Canal and Dungeness Bay,” Lothrop said in a news release.

For details on the fishing seasons, check out the North of Falcon webpage, which will be updated as new information becomes available.

Climate change disrupts steady streamflows, adds problems for chinook

Climate change appears to be altering the flow characteristics of Puget Sound salmon streams, and the outcome could be an increased risk of extinction for chinook salmon, according to a new study.

I’ve long been interested in how new housing and commercial development brings more impervious surfaces, such as roads, driveways and roofs. The effect is to decrease the amount of water that infiltrates into the ground and to increase surface flows into streams.

Chinook salmon Photo: Bureau of Land Management
Chinook salmon
Photo: Bureau of Land Management

Stormwater experts talk about how streams become “flashy,” as flows rise quickly when it rains then drop back to low levels, because less groundwater is available to filter into the streams.

The new study, reported in the journal “Global Change Biology,” suggests that something similar may be happening with climate change but for somewhat different reasons.

Climate models predict that rains in the Puget Sound region will become more intense, thus causing streams to rise rapidly even in areas where stormwater is not an issue. That seems to be among the recent findings by researchers with NOAA’s Northwest Fisheries Science Center and Washington Department of Fish and Wildlife:

“Over the last half century, river flows included in our analysis have become more variable — particularly in winter — and these changes are a stronger predictor of chinook population growth than changes in average winter flows or climate signals in the marine environment.

“While other impacts to this ecosystem, such as habitat degradation, may be hypothesized as responsible for these trends in flow variation, we found support for increasing flow variation in high-altitude rivers with relatively low human impacts.”

Joseph Anderson of WDFW, an author of the report, told me that chinook salmon, listed as threatened under the Endangered Species Act, may be particularly vulnerable to dramatic changes in streamflows. That’s because spawning chinook tend to show up before winter storms arrive — when the rivers at their lowest levels. The fish are forced to lay their eggs in a portion of the river that will undergo the most forceful flows once the rains begin to fall.

High flows can scour eggs out of the gravel and create serious problems for emerging fry, Joe said. Other factors may come into play, but the researchers found a strong correlation between the sudden variation in streamflows and salmon survival.

In the lower elevations, where development is focused, flow variability could result from both impervious surfaces on the land and more intense rainstorms. Efforts to infiltrate stormwater into the ground will become even more important as changes in climate bring more intense storms.

Stormwater management is an issue I’ve written about for years, including parts of last year’s series called “Taking the Pulse of Puget Sound.” See Kitsap Sun, July 16, 2014. Rain gardens, pervious pavement and infiltration ponds are all part of a growing strategy to increase groundwater while reducing the “flashiness” of streams.

Other strategies involve restoring rivers to a more natural condition by rebuilding side channels and flood plains to divert excess water when streams are running high.

According to the report’s findings, the variability of winter flows has increased for 16 of the 20 rivers studied, using data from the U.S. Geological Survey. The only rivers showing less variability were the Cedar, Duwamish, Upper Skagit and Nisqually.

The effect of this streamflow variability was shown to be a more critical factor for chinook survival and growth than peak, total or average streamflow. Also less of a factor were ocean conditions, such as the Pacific Decadal Oscillation and related ocean temperature.

Eric Ward, of Northwest Fisheries Science Center and lead author on the study, said many researchers have focused attention on how higher water temperatures will affect salmon as climate change progresses. High-temperature and drought conditions in California, for example, could damage the organs of salmon, such as their hearts.

Salmon swimming up the Columbia River and its tributaries could encounter dangerously warm waters as they move east into areas growing more arid. Some salmon species are more vulnerable to temperature, while streamflow may be more important for others. Coho salmon, for example, spend their first summer in freshwater, which makes extreme low levels a critical factor.

Eric told me that further studies are looking into how various conditions can affect each stage of a salmon’s life, conditions that vary by species. One goal is to build complex life-cycle models for threatened species, such as chinook and steelhead, to determine their needs under the more extreme conditions we can expect in the future.

What we know and don’t know about killer whales

This week’s report about Puget Sound’s endangered killer whales contained little new information, but the intent was not to surprise people with important new findings. The report (PDF 14.3 mb), published by the Northwest Fisheries Science Center, was a nice summary of 10 years of research and ongoing efforts to unlock the secrets of the mysterious Southern Residents.

NOAA also released the video, at right, which sums up the report with great visuals. Make sure you go full-screen.

On Wednesday, I participated in a telephone conference call to link reporters with killer whale experts in our region. On the line were Lynne Barre, Mike Ford and Brad Hanson, all with NOAA Fisheries out of Seattle. I’ve been wrapped up with other reporting assignments, so the Kitsap Sun’s editors chose to run a solid story by Associated Press reporter Phuong Le. See Kitsap Sun, June 25.

Let me make a few quick observations:

Lynne Barre said one of the greatest mysteries, to her, is why killer whales suddenly go missing. It’s a vexing problem, and I always get a little nervous when the whales return in the spring. One year, six of the Southern Residents failed to show up. It was a real blow to the close-knit orca community and to the struggling population, and I’ve never forgotten the dismay of everyone who cared about these animals.

Healthy killer whales seem to go missing as often as elderly or sick ones. Only a few bodies ever wash up on the beach. Even when one is found, the cause of death often remains uncertain, as in the case of L-112, found to have died of “blunt-force trauma” from some unknown object.

Much more needs to be learned about disease in the animals, Lynne said. Future research could involve more tissue biopsies and breath samples in an effort to identify early signs of disease.

For Brad Hanson, another mystery is the whales’ seemingly unpredictable behavior and their “fundamental relationship with prey.” We all assume that their primary goal in life is to find fish to eat, but how good are they at this essential task? Pretty good, I would guess. Often before we learn that chinook are abundant off the Washington Coast, we find out that the killer whales are already there.

Maybe the reason the whales have been spending so much time away from Puget Sound the last couple years lies in the lower returns of Fraser River chinook, which pass through the San Juan Islands in the summer. Scale and fecal samples have shown that Fraser River chinook are the most consistent prey of the resident orcas.

In previous conversations, Brad has told me that he would love to communicate with the whales, to find out who is in charge and why a group of animals may suddenly turn around and go in the opposite direction. Howard Garrett of Orca Network recalls a time when all three Southern Resident pods were in the Strait of Juan de Fuca heading into Puget Sound. Suddenly K and L pod turned back, while J pod continued on. Howie says it was as if they knew there were not enough fish for the entire population, so J pod went on alone, saying, “See ya later.”

Mike Ford wants to know why the population has not increased more than it has. Could it be some limitation in the ecosystem, such as the fact that other marine mammals — such as seals and sea lions — have been increasing and taking a sizable bite out of the available salmon population? We know that Northern Residents, who also eat fish, don’t overlap territories much with the Southern Residents. Living up north, the Northern Residents have better access to some salmon stocks — including those that originate in Puget Sound. If the Northern Residents get to them first, the fish are not available for the Southern Residents — or so goes one hypotheses. The Northern Resident population has tripled in size, while the Southern Residents have stayed about the same.

Oddly enough, this potential competition for chinook salmon reminds me of exactly what is taking place with regard to commercial fishing enterprises. Washington fishermen complain that the Canadians are taking salmon that should get back to Washington. Canadian fishermen complain that Alaskans are taking salmon bound for Canada. Only Alaskan fishermen — and those who go to Alaska to fish — can catch a portion of the salmon going into Alaskan rivers as well as some destined to travel south.

One of the new things that did come up in Wednesday’s conference call was a renewed effort for U.S. killer whale biologists and managers to work with their counterparts in Canada. “We will be partnering with them on issues of salmon fisheries and how that may affect the whales,” Lynn said, adding that other cross-border efforts could involve vessel regulations and targeted research efforts.

During Wednesday’s conference call, nobody talked about the potential effects of military activities and the possible injury from Navy sonar until a reporter brought up the issue. The question was referred to NOAA Fisheries headquarters in Silver Spring, Md., where officials review the Navy’s operations and issue incidental take permits. That was the end of that discussion.

I know the Navy is conducting research in an effort to reduce harm to killer whales and other marine mammals. I get the sense, however, that more could be done immediately if connections were made between knowledgeable killer whale researchers in our region and those making decisions on the opposite side of the country.

SouthernResidentKillerWhalePhoto

Finding answers to complex orca-salmon connection

The connection seems obvious until you look into the complexities:

  1. Puget Sound chinook salmon are listed as a “threatened” species.
  2. Southern Resident killer whales, which frequent Puget Sound, are listed as “endangered.”
  3. Southern Resident killer whales eat primarily chinook salmon.

Therefore … isn’t it obvious that the shortage of Puget Sound chinook has had a major impact on the whales?

Once you begin to challenge the assumptions — as a seven-member scientific panel has done — a more complex picture emerges. It is not easy to sort out predator-prey interactions, especially considering that the prey may include hundreds of individual salmon stocks, some of which are doing quite well.

The independent panel (PDF 144 kb), made up of U.S. and Canadian scientists, tackled the question of whether cutbacks or elimination of salmon fishing could help rebuild the killer whale population at a faster rate. The panel’s preliminary conclusion is that reducing fisheries could have a slight benefit, but only if certain assumptions hold true.

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Salmon managers will try to eke out fishing options

Forecasts for Puget Sound salmon runs call for lower returns this year compared to last year, but officials with the Washington Department of Fish and Wildlife are emphasizing “promising” chinook fishing off Washington’s coast and Columbia River.

Each year, sport fishers line the banks of the Skokomish River as they try to catch the prized chinook salmon. / Kitsap Sun file photo

Preseason forecasts were released yesterday, launching the North of Falcon Process, which involves state and tribal salmon managers working together to set sport, commercial and tribal fisheries. Federal biologists and regulators keep watch over the negotiations to ensure compliance with the Endangered Species Act.

For a complete schedule of meetings leading up to final decisions the first week of April, go to the WDFW’s North of Falcon page.

With regard to fishing opportunities, Doug Milward, ocean salmon fishery manager for the agency, had this to say in yesterday’s news release:

“It’s still early in the process, but we will likely have an ocean salmon fishery similar to what we have seen the last two years, when we had an abundance of chinook in the ocean but low numbers of hatchery coho.”

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