Toxic substances, such as PCBs, that accumulate in animal tissues become more concentrated as bigger animals eat smaller animals. Animals at the top of the food chain, like orcas, end up with the highest concentration. Illustration: Seattle Post-Intelligencer
In spite of their protected status as an endangered species by Washington state, the U.S., and Canada, the southern resident orca population has fallen. It has declined from 98 in 1995 to only 74 as of September 2018, the lowest in 30 years.
The orca-salmon connection
Southern resident orcas reside in Puget Sound and the Salish Sea waters of British Columbia from late spring through the fall. They also migrate along the west coast from Northern California to Southeast Alaska.
This orca species feeds primarily on Chinook salmon, which also are in decline, adding urgency to salmon recovery efforts in Washington. Many southern residents have been observed to be in poor physical condition and are experiencing difficulty raising calves.
The southern resident orcas face three main threats:
- Availability of Chinook salmon
- Toxic contaminants in the environment
- Disturbance from noise and vessel traffic
The task force set up work groups to focus on each of these threats. We have been leading the group focused on toxic contaminants. This team is working to identify how the state can help reduce the impacts of human-caused contamination on the orcas. Drawing from the closely aligned Puget Sound Action Agenda
, the contaminants group:
- Identifies actions most likely to be implemented and have a beneficial impact on southern resident killer whales.
- Provides the Governor’s task force with decision-making support.
- Helps develop a strategic package for short-term and long-term actions.
How our work helps
Much of the work we do to protect and restore the overall environment benefits orcas. The following are just a few examples.
Helping orcas survive
The work that we and others perform helps, but it’s not enough. Southern resident orcas are in trouble.
Governor Inslee’s Executive Order of March 14, 2018, directed state agencies to take several immediate actions and to recommend long-term strategies. The Governor's order assigned us two short-term actions, which we have completed.
The task force and working groups will develop a second report, due in the fall of 2019, with long term recommendations for recovery of the southern resident orca population.