A Chance Encounter
We pulled into our campsite, steps from the water’s edge. The sun was bright; the sky a deep blue. Seagulls flew high above, cawing across the bay. As we began to unload, I caught movement in my peripheral vision—something popping its head out of the water just feet from shore.
“A sea otter!” I exclaimed and half-ran to a trail overlooking the fjord.
There before me—without a care in the world—was my first sea otter. I stood in awe and wonder as the male went about his daily life, grooming his fur, diving for food, and relaxing on gentle waves. I let out a little squeal in delight.
Since my interview with Chanel Hason of the Elakha Alliance, I had been dying to see a sea otter in the wild. I knew sea otters were a threatened species, but until our interview, I didn’t realize how close we came to losing this keystone species.
“By the mid-19th century, overhunting had decimated sea otter populations, leading to the collapse of the trade. One million sea otters were killed by European and native hunters between the 18th and 19th centuries,” Chanel explained.
A Vanishing Forest Beneath the Waves
The loss of sea otters caused a cascade of unfortunate events. Sea otters hunt a wide variety of oceanic prey, one of their favorites being purple sea urchins. These bottom-dwelling urchins love to munch on kelp holdfasts (the root-like structures kelp use to anchor to the seafloor). With their main predator gone, purple sea urchin populations exploded. Hordes of urchins swept through kelp forests like hungry teenagers at an all-you-can-eat buffet, detaching the sea plants from the ocean bottom.
The result? Ecosystem collapse. Entire underwater forests—and everything that depended on them—vanished.
“Think of a purple carpet on the ocean floor. There are an estimated 350 million urchins on one reef in Southern Oregon alone. They are decimating and eating all the kelp in their path because nothing is keeping their population in check,” Chanel, who has seen these purple hellscapes with her own eyes, told me.
To comprehend this loss, let’s compare kelp forests to terrestrial forests.
The Fastest-Growing Forest on Earth
Kelp forests most commonly grow along rocky shorelines where sunlight reaches the ocean floor and in nutrient-rich, upwelling zones. Like their terrestrial counterparts, kelp forests provide habitat, canopy cover, and understory, which support a large diversity of marine life.
In ideal conditions, kelp can grow up to 2 feet (0.6 m) per day—making it one of the fastest-growing plants on Earth—with giant kelp reaching 150 feet (45 m) in length. Scientists estimate that protecting and restoring these underwater forests could help remove or prevent the release of tens of millions of tons of CO₂ per year—roughly comparable to the annual uptake of a billion or more trees—while also supporting marine biodiversity and coastal resilience
In summary: healthy kelp forests mean thriving marine ecosystems and carbon solutions.
Nature’s $500 Billion Asset
A commonly overlooked quality of kelp forests is their economic value. Worldwide, kelp forests provide ecosystem services worth approximately $500 billion. Yes, 500 billion dollars—not an m, but a b. To put that value in perspective, kelp forests’ annual value is roughly equivalent to Norway’s entire GDP.
And the guardian of this natural circular economy in the North Pacific Rim? Sea otters.
The Brink—and the Rebound
When the fur trade ended, fewer than 2,000 sea otters remained, scattered among 13 remnant colonies. Creatures that once numbered in the 300,000s and were found from Northern Japan to Southern California were reduced to three isolated populations in Russia, Alaska, and California.
Through the International Fur Seal Treaty in 1911, the Marine Mammal Protection Act of 1972, and active restoration efforts, sea otter populations have rebounded to approximately 150,000 individuals. (Woo!)
But we’re not out of the water yet. (Aw…)
The southern subspecies, once found from Oregon to Baja California, Mexico, has only reclaimed 13% of its former range. The extreme population bottleneck also has scientists concerned about genetic drift and the fitness of recovering populations.
The northern subspecies—from southern Alaska to Washington State—has rebounded in great numbers, although individual sea otter stocks have varied in their recovery.
Oregon’s Missing Otters
And in Oregon, where sea otters have been absent for over a century, organizations like the Elakha Alliance are striving every day to bring sea otters back. The state did try once. In 1970–71, 93 sea otters were released near Port Orford and Cape Arago. Many emigrated immediately and, despite a few pups, the effort failed—insight that now informs modern translocation design.
Natural recolonization is also unlikely.
“ Sea otters are not a migratory species, which is why they haven’t naturally swam back to Oregon and said, ‘Hey, we’re home.’ About one-third of sea otters today are due to successful translocation efforts. Sea otters were reintroduced in Washington in the 1970s and also reintroduced in Oregon at the same time, but [the effort] was unsuccessful in Oregon,” Chanel told me after I asked her if sea otters might naturally migrate back to the Oregon coastline.
“Researchers think they didn’t release enough animals during that time to withstand natural immigration and mortality rates that happen in a translocation. They survived for about a decade and had pups, but they eventually just disappeared. I think a future translocation would be much more successful, but they are wild animals, so nobody ever knows. We have enough data and science now to understand from past translocations how to make a more successful one,” Chanel further explained.
Reading and talking about recovery is one thing. Witnessing it is another entirely.
Seeing the Recovery
Back in Seward, Alaska, my close friend, Courtney, and I boarded the Wayward Lynx. We met our guide—Captain Andrew—and our fellow passengers. After a mandatory safety chat, tour of the small boat, and an overview of proper wildlife viewing behavior, we set sail, gliding past anchored boats and the town’s quaint and colorful downtown waterfront.
Out on open water, Captain Andrew opened the Wayward Lynx’s throttle, cruising through the fjord. I clutched my camera to my side, ready to photograph any wildlife we came across—while also praying I didn’t suddenly become a klutz and send my camera overboard. The thought made me tighten my grip on the camera body.
As we approached the opposite rocky shoreline, Captain Andrew slowed the boat. To our delight, we found another sea otter—who was very photogenic and giving us a show. I clicked away as the otter showed off its acrobatics, hunting skills, and latest catch.
Later in the tour, we found two mothers with tiny pups. I practically melted on the boat’s back deck watching the mothers dote on their little ones, cleaning their fur, fluffing them up, and holding them tightly.
Watching those mothers with their pups, my conversation with Chanel fully clicked into place. This isn’t just a restoration story about the sea otter; it’s a story of paying attention to the myriad connections in an ecosystem, giving entire underwater forests the chance to recover, and protecting ecosystem services worth half a trillion dollars.
Frequently Asked Questions
Current sea otter populations have recovered to approximately 150,000 individuals worldwide, up from just 2,000 survivors in the early 1900s. However, the southern subspecies has only reclaimed 13% of its former range, from Oregon to Baja California, Mexico.
Sea otters are a keystone species that regulate purple sea urchin populations. Without otters, urchins explode in number and devour kelp forests—underwater ecosystems worth approximately $500 billion globally in ecosystem services. One sea otter can eat 25% of its body weight daily, keeping urchin populations in check and protecting these vital marine forests.
Between the 18th and 19th centuries, between 500,000 and one million sea otters were killed during the maritime fur trade. Populations crashed from an estimated 300,000 individuals to just 2,000 survivors scattered in three isolated populations in Russia, Alaska, and California. The species came perilously close to extinction.
No. Oregon’s coastline has been otter-free for over a century, creating a 300-mile gap in the species’ historical range. Organizations like the Elakha Alliance are working to assess the feasibility of reintroducing sea otters to Oregon’s coastal waters and restoring the kelp forest ecosystems that once thrived there.
Globally, kelp forests provide approximately $500 billion in ecosystem services annually—roughly equivalent to Norway’s entire GDP. These services include carbon sequestration (kelp and seaweed forests sequester as much carbon as the Amazon rainforest), habitat for commercial fisheries, coastal protection, and nutrient cycling.
Urchin barrens are areas of ocean floor that have been stripped bare of kelp and other marine vegetation by exploding sea urchin populations. Without sea otters to keep urchin numbers in check, these bottom-dwelling creatures can form dense aggregations—like the estimated 350 million purple sea urchins on a single reef in Southern Oregon—that devour kelp holdfasts and destroy entire underwater forests.
Resources & Further Reading
Kelp Forest Ecology & Climate Science
- Macrocystis pyrifera – Wikipedia: General overview of giant kelp biology, structure, and distribution.
- Harvard SITN: How Kelp Naturally Combats Global Climate Change: Explains the role of kelp in carbon sequestration and global climate regulation.
- Pessarrodona et al., 2023 – The Carbon Sequestration Potential of Seaweed Forests (Biological Reviews): Comprehensive scientific review quantifying how seaweed ecosystems contribute to carbon storage.
- NOAA Climate.gov: Understanding Blue Carbon: Explores how coastal ecosystems capture and store carbon dioxide.
- Eger et al., 2023 – The Value of Global Kelp Forests in Ecosystem Services (Nature Communications): Landmark study estimating kelp forests’ annual global economic value at roughly $500 billion.
- Smale et al., 2020 – Forms and Functions of Kelp (Marine Environmental Research): Reviews kelp forest functions, growth patterns, and ecological importance.
- Trading Economics: Norway GDP Data: Reference point for contextualizing kelp forests’ global economic value.
- Conservation International (2023): New Research Finds Kelp and Seaweed Forests Are Overlooked Climate Change Solutions: Press release summarizing emerging research on seaweed’s carbon potential.
Sea Otter Biology & Conservation
- Marine Mammal Commission – Northern Sea Otter (Enhydra lutris kenyoni): Species profile with population trends, distribution, and conservation challenges.
- Marine Mammal Commission – Southern Sea Otter (Enhydra lutris nereis): Details on recovery status and threats to the California subspecies.
- U.S. Fish & Wildlife Service (2023): Northern Sea Otter Stock Assessment Report, Southwest Alaska: Latest federal assessment of population data and management actions.
- Larson et al., 2023 – Genomic Insights into Sea Otter Recovery (Molecular Ecology): Examines genetic diversity and implications for long-term sea otter restoration.
- IUCN Red List – Enhydra lutris (Sea Otter): Global conservation status, distribution map, and trend data.
Restoration & Regional Efforts
- Elakha Alliance: Oregon-based organization leading sea otter reintroduction and coastal ecosystem restoration efforts.
Article Summary
Topic: Sea otter conservation and kelp forest ecosystem restoration
Key Species: Southern sea otter (Enhydra lutris nereis), Northern sea otter (Enhydra lutris kenyoni), purple sea urchin (Strongylocentrotus purpuratus), giant kelp (Macrocystis pyrifera)
Main Insights:
- Sea otters are keystone species that regulate purple sea urchin populations and protect kelp forests
- 500,000 to 1 million sea otters were killed during the 18th-19th century fur trade, reducing populations from 300,000 to approximately 2,000 individuals
- Kelp forests provide $500 billion in annual ecosystem services globally
- Kelp can grow 2 feet per day—dozens of times faster than terrestrial plants
- Current sea otter populations have recovered to ~150,000 individuals
- Southern sea otters have only reclaimed 13% of their former range (Oregon to Baja California)
- Oregon currently has no sea otters after over a century of absence
Organizations Mentioned: Elakha Alliance (Oregon sea otter restoration)
Conservation Status: As of 2025, sea otters are listed as Largely Depleted by the IUCN
Related Topics: Trophic cascades, keystone species, marine ecosystem restoration, kelp forest ecology, carbon sequestration, ecosystem services valuation
Geographic Focus: Alaska (Sitka), Oregon coast, California coast, North Pacific Rim
Content Type: Personal narrative, conservation science, systems thinking, wildlife observation
Podcast Episode Referenced: Sea Otters & Kelp Forests: Rewilding Oregon’s Coast with Chanel Hason
