West Coast Salmon Vulnerable to Climate Change, but Some Show Resilience to Shifting Environment

July 26, 2019 — The following was released by NOAA Fisheries:

Several of the West Coast’s prime salmon runs are highly vulnerable to climate change, but intensified habitat restoration and other measures can help support their natural resilience and adaptability. The new NOAA Fisheries report, published this week in PLOS ONE, is the first comprehensive climate vulnerability assessment for West Coast salmon and steelhead.

Certain Chinook, coho, and sockeye salmon population groups are the most vulnerable to expected environmental shifts with climate change. These include more extreme high and low flows and hotter oceans and rivers. Steelhead, pink and chum salmon face less risk, either because they are more adaptable to varying conditions (steelhead) or spend less time in freshwater (pink and chum).

Species-specific results are available for each population group.

Authors noted that salmon have long thrived in the region, proving themselves resilient to past shifts in climate. However, climate is now changing at an unprecedented rate. Most populations now lack access to habitat that once provided refuge from climate extremes.

“Salmon have always adapted to change, and they have been very successful—otherwise they wouldn’t still be here,” said Lisa Crozier, a research scientist at NOAA Fisheries Northwest Fisheries Science Center and lead author of the assessment. “What we are trying to understand is which populations may need the most help with anticipated future changes in temperature and water availability, and what steps we can take to support them.”

Read the full release here