Tag Archives: wolves

Amusing Monday: Wolves found to catch and eat wild salmon

I’m amused by this looping video, which shows a bear waiting for a fish to appear. In the background, a wolf reaches down nonchalantly, bites into a large salmon and carries it away.

Not long ago, it was widely believed that bears love salmon but that wolves prefer deer, elk, moose and related animals whenever they can find them. Now we know, from careful observations in Alaska, that wolves will go after salmon when they get the opportunity.

Researcher Dave Person of the Alaska Department of Fish and Game says wolves will seek out tidally affected streams where they can find salmon passing through shallow water and trapped in pools.

“They’re not as skillful as bears at fishing,” Person told Riley Woodford, reporting for Alaska Fish and Wildlife News. “Each year, they spend over a month in estuary areas, with the pups. It’s right in middle of pink and chum runs, and we watch them eat salmon all the time. There are lots of places they could go; I think they go there for the fish.”

Based on the video, I would have to say that wolves are pretty good at catching fish upstream as well.

Salmon may have gone unnoticed as a staple in the wolves’ diet, because the entire salmon, bones and all, are digested by wolves, leaving no signs of fish in their scat — unlike the bones and fur discovered after they eat a deer or other mammal.

Another Alaskan biologist, Shelly Szepanski, has been studying the stable isotopes of carbon and nitrogen in wolf bones to see whether the bones are made of elements that come from the land or the sea. She found that salmon appeared to make up as much as 20 percent of the diet of wolves living in coastal areas of Southeast Alaska, compared to 10 percent of those living farther inland.

As I continued to look at the video of the bear and wolf fishing for salmon, I wondered if they ever interacted and how things might turn out in a head-to-head fight. I was able to find a video that demonstrates that a bear might get the best of a wolf in a one-on-one battle, but we can never forget that wolves often travel in packs. If you watch to the end, you will see who takes charge of the meal in question.

For another video showing wolves eating salmon, in which a bear plays a minor role, check out this video posted by Tinekemike.

Speaking of fights, I am still amazed at the video below, which shows a leopard swimming across a stretch of water, grabbing onto a crocodile and dragging it back into the water. I never would have guessed that a croc could be defeated in or around water like that — but it looks like he never saw the cat coming until it was too late.

Snow brings freshness to animals at Woodland Park

Photographers at Woodland Park Zoo caught some great images of animals that don’t seem to mind the snow. The zoo was closed Wednesday and Thursday because of the snow but reopened today.

Rebecca Whitham notes on the zoo’s blog:

“Some animals retreat indoors or look for a warm spot to tuck themselves into to get out of the snow, while others — like our residents of the Northern Trail exhibit — are in their element.”

Beyond the photos on this page, check out Snow Day at the Zoo and Snow Day, Part 2 on the zoo’s website.

Four sister wolves — Doba, Shila, Aponi and Kaya — romp in the snow.
Photo by Ryan Hawk, Woodland Park Zoo
A grizzly bear shakes off snow in the Northern Trail exhibit.
Photo by Kristen Pisto, Woodland Park Zoo
Unlike most penguins, Homboldt penguins enjoy a warmer climate along rocky shores of South America. These guys don’t seem to mind the change, however, and zoo staffers are making sure none of the animals get too cold.
Photo by Ryan Hawk, Woodland Park Zoo

Fishers in the Olympics help us think big

The effort to reintroduce fishers into Olympic National Park continues to be an exciting good-news story, but the implications may be even greater than they seem at first glance.

We must wait to see whether the males and females among the 40 or more fishers will find each other. But biologists say there’s a good chance they will, and researchers may discover some dens with kits either this spring or maybe next year.

I had the privilege of seeing five fishers released yesterday near Staircase Ranger Station in Olympic National Park. These were the first animals to be released on the east side of the mountains. For a description of their rapid escape into the woods, see my story and watch the video in today’s Kitsap Sun.

While on the outing, I talked to Jasmine Minbashian of Conservation Northwest about the potential for unexpected results from this experiment. As an example, she wondered about the potential of a trophic cascade, such as seen in Yellowstone Park after the introduction of wolves. In a chain of events, the wolves have done a great favor for fish in the national park.

Wolves not only eat elk at times, but their presence frightens away these animals that love to eat the shoots of aspen trees. Without the elk browsing continuously, the aspens grow into dense vegetation that can provide shade, cover and insects — all to the benefits of fish and other creatures.

Chris Conway of the New York Times does a nice job explaining this in a brief story from Aug. 5, 2007. For a little longer version, see Science Daily, which points out:

Prior to the re-introduction of wolves, scientists found there were many small sprouting shoots of these important tree species, and numbers of large trees 70 years old or more — but practically nothing in between. High populations of grazing ungulates, primarily elk, had grazed on the small tree shoots at leisure and with little fear of attack.

But the ecological damage, researchers say, went far beyond just trees. The loss of trees and shrubs opened the door to significant stream erosion. Beaver dams declined. Food webs broke down, and the chain of effects rippled through birds, insects, fish and other plant and animal species.

For more information about trophic cascades, go to the Web site of Oregon State University, where this issue is being studied in depth.

As for Olympic National Park, the extermination of wolves on the peninsula may have had a cascading effect on species that depend on cottonwood and bigleaf maples. The Fall 2008 issue of Island Geoscience (PDF 732 kb) tells it this way:

In 1890, members of the Press Expedition found the banks of the upper Quinault River “so dense with underbrush as to be almost impenetrable,” they wrote at the time. Logs jammed the rivers, dense tree canopies shaded and cooled the streams, and trout and salmon thrived, along with hundreds of species of plants and animals.

“Today, you go through the same area and instead of dense vegetation that you have to fight through, it’s a park-like stand of predominantly big trees,” said Bill Ripple, a co-author of the study and forestry professor at Oregon State University. “It’s just a different world.”

“Our study shows that there has been almost no recruitment of new cottonwood and bigleaf maple trees since the wolves disappeared, and also likely impacts on streamside shrubs, which are very important for river stability,” said Robert Beschta, lead author of the study and professor emeritus of forest hydrology at OSU. “Decreases in woody plant communities allow river banks to rapidly erode and river channels to widen.”

Efforts to reintroduce wolves to the Olympic Peninsula are on hold for the time being. But we have a lot to think about. What we can learn from the fisher may be much more than the idea that we should have a few more of the furry animals running around.