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United States

Westcott Bay

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Conservation benefit: Reseeding of 13 acres of seagrass

Date Approved: 02.2020

Seagrass

This project protects seagrass, which traps more CO2 than any other marine ecosystem, slowing global warming.

This project will replant eelgrass (a kind of seagrass) in part of Puget Sound, Washington, where it began to disappear in the early 2000s.

The disappearance of eelgrass inflicted immediate and long-lasting damage on the marine environment of the San Juan Islands. Herring spawn in eelgrass, so the loss of habitat devastated their population. In turn, Chinook salmon, which eat herring, declined. Now there are fewer salmon, which make up 80 to 90% of their diet of the resident killer whales.

In the Pacific Northwest, these flowering plants, which grow submerged in shallow marine waters, provide myriad benefits, including:

  • Food for waterfowl
  • Shelter for many species of fish, crustaceans, and other animals
  • Storm and erosion mitigation as their’root systems stabilize the soft ocean bottom
  • Better water quality, by trapping fine particles and filtering nutrients in runoff
  • Economic support, as habitat for commercially important fish
  • Carbon sequestration, because an acre of seagrass can store about three times as much carbon as an acre of rainforest

This project will restore eelgrass in Westcott Bay by planting seeds. This is a promising method, and is potentially less costly than the standard practice of transplanting mature plants. Seeds have been used successfully in other areas (Chesapeake Bay, for example), but haven’t been tried widely in Puget Sound.

Luckily, the biggest expanse of eelgrass in the lower 48 states is in nearby Padilla Bay. Our project partners will collect flowering eelgrass shoots there. They will hold the shoots in flowing seawater while the seeds mature. Once mature, the seeds may need to be treated to make them sink quickly, so that they sink in the area targeted for restoration. Then, volunteers will broadcast the seeds at the restoration site. Divers will assess success in the spring of 2021.

Project Updates

June 2020

A new study reports that eelgrass in Puget Sound has another superpower: It reduces the toxin-producing algae that make shellfish dangerous for people to eat. Researchers found that around eelgrass beds, there are significantly fewer (compared to bare seabed) of the algae that produce harmful toxins.

Read more

May 2020

Because of restrictions to prevent the spread of Covid-19 in Washington, our project partners have not been able to conduct fieldwork to further define the restoration site in Westcott Bay. They did, however, meet remotely with staff at the Washington State Department of Natural Resources, and narrowed the site choices. Fieldwork will resume when it is permitted.

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