Sea otters return with a worrying vengeance in BC

Sea otters return with a worrying vengeance in BC
Sea otters return with a worrying vengeance in BC

From the stern of a skiff speeding away from Vancouver Island, Joe Martin trains a steely gaze on the scattered islets just west of Tofino. With the summer sun due to set in about an hour, he says, nearby sea otters are likely out foraging. A wildlife guide in the area for more than 30 years, he knows where the slippery critters like to cavort, and quickly spots one a couple kilometres south of Vargas Island, bobbing in choppy waters, and blending with the mess of kelp sweeping the surface.

Wary of the intrusion, the otter keeps a safe distance of about 30 m, giving the skiff double and triple takes before disappearing into the deep. It’s not long, however, before several more otters surface and surround the vessel. Some pop from the water like prairie dogs, inspecting the boat from a few different angles. Others are less guarded, and treat their guests to a water-borne wrestling show instead.

With adorable faces and a penchant for lounging face-up on the water—sometimes with a pup or a buffet of shellfish on their bellies—the furry marine mammals look the picture of easy living. The past decade has seen their numbers soar along the B.C. coastline, in a back-from-the-brink recovery some hail as a conservation success story, but others—especially West Coast First Nations—believe is already upsetting the balance of local ecosystems. The comeback took 50 years, and no small amount of human intervention.

Before that, to put it mildly, the actions of humans had not been kind to these creatures. Prior to the Maritime fur trade of the 18th and 19th centuries, an estimated 150,000 to 300,000 sea otters lived along the Pacific Rim, ranging from northern Japan to the Baja peninsula. Sought out for their soft, rich pelts that can carry up to one million hairs per square inch, they were hunted to the edge of extinction by 1911, when their worldwide numbers fell to fewer than 2,000. The last otters seen in B.C. for decades were reportedly shot off the west coast of Vancouver Island between 1929 and 1930.

The reintroduction to B.C. took place between 1969 and 1972, when the Canadian and U.S. governments moved 89 otters from Alaska to Checleset Bay, on the island’s northwest coast. It was near there, in the early ’80s, that Martin first laid eyes on one. “And then,” he says, “they just multiplied like crazy.”

Designated an endangered species in Canada in 1978, and later downgraded to a species of special concern in 2007, sea otters have since thrived thanks to protection efforts and an ecological shift that’s converted their romping grounds into a highly hospitable habitat. As of 2017, Fisheries and Oceans Canada estimated B.C.’s otter population at more than 8,000, reoccupying somewhere between a quarter to a third of their historic range in the province.

Many ecologists are quick to praise the so-called “rewilding” effort, as the otters have begun altering their ecosystem closer to an unexploited state. But life on the coast has also changed since the otters’ absence, and not all residents view their comeback in a favourable light.

Edward Gregr, a marine biologist with the University of British Columbia, recently studied some of the costs and benefits connected to the recovery. On one hand, he says, the animals come with considerable economic advantages: the predicted boost in eco-tourism alone is pegged at $42 million per year.

But sea otters are more than just cuddly-looking critters. They’re also voracious predators and, more specifically, what ecologists call a “keystone species.” Like the central stone that locks an arch, they play a pivotal role in their environment—so pivotal that their absence or presence can trigger dramatic changes.

In the years before the reintroduction, Gregr explains, sea urchins, clams, crab and abalone—the marine mammal’s preferred prey—prospered, supporting shellfish fisheries and coastal communities that found opportunity in more abundant and accessible catches. Without otters to keep them in check, sea urchins in particular, with a healthy appetite for flora, were free to mow down large swaths of kelp forests that once flourished. “We ended up with what we call urchin barrens,” Gregr says, “places that are basically devoid of plant life and are covered in urchins because they eat any kelps that happen to grow up.”

While ideal for fisheries, the urchin gluts also offered a boon to the recovering, and ravenous, otters. Carrying little fat beneath those dense, fur coats, the animals need to consume more than 20 per cent of their body weight each day to stay warm in the water, which makes them a competitive threat to commercial fisheries harvesting urchin or other shellfish. According to the study, recovering otters, and their appetites, could cost these fisheries more than $7 million per year.

“These commercial fisheries may not be possible, or they may have to change in the presence of sea otters,” says Gregr. “Urchins aren’t gone from the system, but they’ve gone back to hiding in crevices, which makes them smaller and harder to access.”

Recovering kelp forests, on the other hand, are projected to offset the loss with benefits such as carbon sequestration, estimated at $2.2 million annually. The seaweeds also invite more diverse marine life, including commercial fin fish, worth nearly $10 billion per year. These include everything from lingcod and rockfish to kelp crabs and smaller invertebrates that feed other parts of the ecosystem.

Based on these variables, the study concludes that the transformations triggered by otter recovery offer a net benefit. Trouble is, these benefits are likely distributed inequitably, and communities that lack the resources to adapt may feel the losses more acutely. Where larger, commercial fisheries might shift to deeper waters, fishers that keep closer to shore, including those in some Indigenous communities, may be restricted.

Martin, who’s also a councillor with the Tla-o-qui-aht First Nation, says he’s met with several members of nearby Indigenous communities who see the otters as a threat to their food security. Not long after the animals were reintroduced, he recalls, he began hearing complaints from residents of Kyuquot, a First Nation community down the coast from Checleset Bay.

“Those people up there were very upset about having [the otters] around because they’re eating everything up,” he says. “Those kinds of things have certainly affected many of the communities that are very isolated, and that do not have direct access to the Co-op grocery store, if you will.”

These concerns are captured in Coastal Voices, an online library featuring scientists, Indigenous leaders and Elders who discuss the effects of the otters’ return to their territories. Anne Salomon, a marine ecologist at Simon Fraser University who leads the project, points to an underlying theme in the testimonies: when the otters were brought to the island, it was done without the consent of these communities.

“Indigenous people are feeling like they have very little control over a predator that’s directly, and very quickly, reducing the numbers and size of many of the shellfish that are a major source of food,” she says. “If your arms are tied, you would feel that way. If you could do something about it, you might feel differently.”

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