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ODFW: Oregon's rocky nearshore shows major kelp loss, urchin rise and abalone decline
Summary
ODFW survey data show chronic declines in kelp canopy (roughly 70% loss since pre‑heat‑wave baselines), large increases in grazing purple sea urchins and severe declines in key sea stars and abalone; staff described monitoring methods and the limits of near‑term ecological recovery.
State marine scientists told the Ocean Policy Advisory Council that Oregon's rocky nearshore ecosystems have changed dramatically since marine heat‑wave events and the 2014 sea star wasting epidemic.
"Kelp is really chronically reduced in the state — we have about 70% less kelp now than we did before those heat waves," Scott Gross said, summarizing aerial, drone and diver‑transect data showing sharp canopy losses at major reefs such as Orford Reef. He described a boom in purple sea urchins after predator losses, and widespread reductions in several sea star species (notably Pycnopodia, the sunflower sea star) that historically controlled urchin populations. Abalone populations — both red and flat species — have fallen to the point that prior recreational and commercial fisheries were closed; recent surveys failed to detect previously dense aggregations.
Gross said monitoring is funded through partnerships (commercial fishing funds, grants and university work) and uses longstanding transect stations, and he cautioned that ecological recovery will likely require complex, multi‑pronged efforts combining research, restoration and long‑term funding. The ODFW presentation set up subsequent kelp‑restoration and community efforts presented later in the meeting.
