Chronic stress from lack of oxygen can make aquatic organisms more vulnerable to disease, pollution, or predation. Low oxygen can also result in reduced habitat for some species. Aquatic species may escape, acclimate, adapt, or die with exposure.

Estuaries around the world including Puget Sound perform an amazing feat of continuous water mixing called estuarine exchange flow. 

Like the air we breathe, oxygen that is dissolved in the water is critical for aquatic life. When dissolved oxygen is low, fish and other aquatic organisms may not be able to survive. 

Nitrogen is a chemical element that is essential for the growth of all life on earth. But too much nitrogen can lead to low dissolved oxygen and other problems such as toxic algal blooms that can harm or kill aquatic organisms. 

Use our interactive map to determine if a geographic feature is within the boundaries of the Puget Sound or Salish Sea watersheds. The Puget Sound region includes the area within the United States while the Salish Sea region* encompasses the entire shaded area. Areas that influence circulation in the Salish Sea or eventually drain into the estuary are marked by broader boundaries.

Raging wildfires can be an ecological disaster, especially as the planet warms due to climate change. But in small doses, some wildfires are actually beneficial. In prairie habitats, fires can enrich soils and maintain native plant species. In late September, state wildlife biologists oversaw several controlled burns near Joint Base Lewis-McChord (JBLM) as part of an effort to preserve habitat for the endangered Taylor's checkerspot butterfly. Less than 3% of Puget Sound's prairies now remain and are mostly concentrated along the region's southern edges, including land on the military base. Listen to a recording of some of the action, including comments from JBLM fire manager and biologist John Richardson.

What do people really mean when they talk about the environment? A new podcast asks regular citizens a simple, but charged question: "What are the environmental challenges that are most important to you?" The answers to that question drive this engaging podcast in sometimes unexpected directions, from the environmental impacts of being homeless, to air quality, to wide-ranging discussions about environmental justice. 

A 2019 story map produced by the University of Washington Puget Sound Institute in collaboration with the Washington Department of Fish and Wildlife shows how shoreline armoring can often be replaced by softer, shore-friendly features.

A broad collaboration of volunteers, agencies, and tribes are working together to keep invasive European green crabs at bay in Washington state. This story map was produced by the Encyclopedia of Puget Sound and the Puget Sound Institute in collaboration with the Washington Sea Grant Crab Team. 

A 2017 course at the UW Jackson School of International Studies examined how to create alliances between the Tulalip Tribes and non-tribal millennials through improved intercultural communication. The students in the course produced a multi-media story describing their experiences. 

Eelgrass in Puget Sound makes a noticeable bubbling sound as it expires oxygen on sunny days during the spring and summer.

The Puget Sound Model was designed and built by the University of Washington School of Oceanography in the early 1950s to simulate the tides and currents of Puget Sound. A series of videos produced by the Encyclopedia of Puget Sound describes its construction and operation.

A 2010 video by the University of Washington Tacoma describes efforts to protect and restore the Puyallup watershed. 

A camera on board a remotely operated vehicle scans the floor of Puget Sound capturing digital video of underwater marine life.  Selected clips of Plumose sea anemones, Pacific halibut, Pacific cod, Sea stars, and North Pacific spiny dogfish are now available for public viewing.

Download presentations from the Study Panel on Ecosystem-based Management of Forage Fish held August 25, 2013 at the University of Washington’s Friday Harbor Lab, San Juan Island.

Could recent declines in Puget Sound herring be linked to decreases in native eelgrass? Biologist Tessa Francis reports on a new study that may provide insight into the health of one of the region's most iconic forage fish.

Audio recordings of the Mazama Pocket Gopher.

An audio recording of an early morning soundscape on Treasure Island in Puget Sound. 

Browse a collection of shellfish photos provided by the Swinomish Tribe.

Audio recordings of rhinoceros auklets on Protection Island.

Puget Sound is calling: EoPS now has custom ringtones. Add the sounds of Puget Sound-area species like the Rhinoceros Auklet or Pacific Chorus Frog to your phone today.