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Encyclopedia of Puget Sound


Salish Sea Currents

timely, local stories about ecosystem recovery

Welcome to Salish Sea Currents, an online magazine grouped into themed series. Join us as we report on some of the key issues driving Puget Sound recovery. To be notified of new stories, subscribe to the Puget Sound Institute eNews.

Implementation Strategies

New EPA-funded Implementation Strategies are designed to target Puget Sound recovery in the most direct and coordinated way ever conducted by state and federal agencies. We report on how these strategies will affect Puget Sound’s Vital Signs for years to come, and why you should care (a lot). Sponsored by U.S. EPA.


Invasive species in Puget Sound

A main story and 3 vignettes on the sources, impacts, and regulation of non-native species entering local waters. Sponsored by U.S. EPA and Washington Department of Fish and Wildlife.


Themes from the 2016 Salish Sea Ecosystem Conference

A series covering major science themes presented at SSEC16 in Vancouver, BC. Sponsored by U.S. EPA and the Salish Sea Ecosystem Conference.


SSEC16 snapshots

Brief reports on SSEC16 in Vancouver, BC. Sponsored by U.S. EPA and the Salish Sea Ecosystem Conference.


Rethinking shoreline armoring

An in-depth series on issues related to shoreline armoring in the Puget Sound region. Sponsored by U.S. EPA and Washington Department of Fish and Wildlife.


Disease as an ecological force

A main story and two vignettes on impacts of disease in the ecosystem. Sponsored by U.S. EPA.


Themes from the 2014 Salish Sea Ecosystem Conference

A 10-story series covering major science themes presented at SSEC14 in Seattle, WA. Sponsored by U.S. EPA and the Puget Sound Partnership.

Invasive stowaways threaten Puget Sound ecosystem

Gaps in regulations could allow invasive species to hitch a ride on ships and boats. We report on some of the potential impacts, and how state and federal agencies are trying to solve the problem. 

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A state inspector boards a container ship at the Port of Seattle to check on ballast water and determine whether procedures were followed to reduce the risk of invasive species being released into Puget Sound.  Photo: WDFW

Building a baseline of invasive species in Puget Sound

Almost twenty years ago, volunteer biologists began an intensive survey for invasive species in the marine waters of Puget Sound. In a little over a week of hunting, they found 39 such species, including 11 never before seen in the region.

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The orange-striped Asian anemone (Diadumene lineata) was commonly observed in Shelton during the 1998 Puget Sound Expedition. Photo: James Koh (CC BY-NC-SA 2.0) https://www.flickr.com/photos/jameskoh/3835201631/

Invasive marine species: Washington state priorities

The Washington Invasive Species Council evaluated more than 700 invasive species in and around Washington, considering their threats to the state’s environment, economy, and human health. They included terrestrial plants and animals, aquatic plants and animals (both freshwater and saltwater), insects and diseases. In the end, the council listed 50 “priority species” for action, including five marine animals and two marine plants, along with one virus that infects fish. 

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A clump of cordgrass (Spartina alterniflora) Photo: USDA-NRCS PLANTS Database

Killer whale miscarriages linked to low food supply

New techniques for studying orcas have been credited with breakthroughs in reproductive and developmental research. Drones and hormone-sniffing dogs are helping scientists connect declines in food supply with low birth rates and poor health.  

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Photogrammetry image of an adult female Southern Resident (J16) as she’s about to surface with her youngest calf, born earlier in 2015, alongside. Photo: NOAA Fisheries, Vancouver Aquarium

Salish Sea snapshots: Detecting harmful algal blooms

Environmental samplers may provide early detection of harmful algal blooms (HABs) in Puget Sound. This toxic algae is expected to increase as the climate changes, bringing with it new and potentially more severe outbreaks of shellfish poisonings. 

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Monitoring devices deployed by NOAA for detecting harmful algal blooms. Photo by Rachael Mueller.

Mystery remains in deaths of young salmon

The Salish Sea Marine Survival Project has mobilized dozens of organizations in the U.S. and Canada to find an answer to one of the region's greatest mysteries. What is killing so many young salmon before they can return home to spawn? A series of talks at the 2016 Salish Sea Ecosystem Conference brought together some of the latest research. 

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Key hypotheses include bottom-up and top-down processes and additional factors such as toxics, disease, and competition.  Graphic: Michael Schmidt, Salish Sea Marine Survival Project

Contaminants higher in resident 'blackmouth' chinook

Many of Puget Sound's chinook salmon spend their entire lives in local waters and don't migrate to the open ocean. These fish tend to collect more contaminants in their bodies because of the sound's relatively high levels of pollution. 

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Chinook salmon (Oncorhynchus tshawytscha). Photo: WDFW

Salish Sea 'slime' vital for shorebirds

It turns out that a gooey substance known as biofilm is a big deal for Salish Sea shorebirds, providing critical food for some species. But could a proposed port expansion in Vancouver threaten this slimy resource?

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Studies suggest that western sandpipers depend on biofilm for close to 60% of their diet. Storey's Beach, Port Hardy, BC. Photo:  Nicole Beaulac (CC BY-NC-ND 2.0) https://www.flickr.com/photos/nicolebeaulac/26579296150

Conference snapshot: Listening to the Salish Sea

Scientists are realizing that underwater noise in the Salish Sea affects a broad range of species, even plankton. Read a Q & A with the organizers of the session 'From plankton to whales: underwater noise and its impacts on marine life.'

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Killer whales and boat in Puget Sound. Photo courtesy of NOAA.

Gearing up for the 2016 Salish Sea Ecosystem Conference

About 4,600 miles of coastline wind from southern Puget Sound to northern British Columbia along what is known as the Salish Sea. It is a land of connections and contradictions. Snowmelt from three national parks feeds more than a thousand creeks and rivers that in turn flow to the rich floodplains and estuaries of places like the Skagit and Nisqually Delta. It is one of the most diverse and spectacular ecosystems  in the world, a fact made even more incredible because it is also home to 8 million people. 

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State guidelines offer new approaches to shoreline protection

Bulkhead removal is becoming an attractive option for many shoreline property owners as awareness spreads of their geological and ecological impacts, and as aging bulkheads come up for replacement. New state guidelines provide alternatives to hard armor.

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Marine Shoreline Design Guidelines (MSDG) report cover

Sources of sand: maps show crucial “feeder bluffs”

For more than a hundred years, property owners have seen shoreline erosion as the enemy. But it turns out that in many cases erosion is actually a good thing — crucial, according to scientists — because it provides the sand and gravel needed for healthy beaches.

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Feeder bluff and beach at Fort Flagler Historical State Park. Marrowstone Island, WA. Photo: Kris Symer (CC BY-NC-ND 4.0)

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