Photo by by Grant Callegari, Hakai Institute, Knight Inlet 2020
A global study, lead by Oregon State University, The Nature Conservancy, Hakai Institute (including Alyssa Gehman, PDF at the Harley lab) and other partner institutions found a 90.6% decline in the global Sunflower sea star (Pycnopodia helianthoides) population. As a result, the Sunflower sea star is now listed by the IUCN as "critically endangered" and raises concerns on the future of the Kelp forest ecosystem.
More on this:
Toronto Star: https://www.thestar.com/news/canada/2020/12/18/once-abundant-sunflower-sea-star-now-critically-endangered.html
Canada’s National Observer: https://www.nationalobserver.com/2020/12/17/news/sunflower-sea-star-critically-endangered-iucn-red-list
CBC News: https://www.cbc.ca/news/canada/british-columbia/sunflower-sea-star-decline-1.5844674
Oregon Public Broadcasting: https://www.opb.org/article/2020/12/11/sunflower-sea-stars-critically-endangered-species/
Hakai Magazine: https://www.hakaimagazine.com/videos-visuals/sunflower-sea-stars-now-critically-endangered/
The Nature Conservancy media release: https://www.nature.org/en-us/newsroom/california-sea-star-endangered/
IUCN listing: https://www.iucnredlist.org/species/178290276/178341498