Field Fun Friday

Two Canada lynx kittens from a family of five captured on a remote camera in Kluane, Yukon Territory last summer. When food is abundant, lynx have big families, like this one. When food is not abundant, females have fewer kittens or may forego having kittens altogether. Kittens stay in their mother’s den for several weeks after birth in May. In the peak of the summer, they begin to explore the world outside their den. This camera captured images of the family on one of its first trips out of the den.

Females will soon be establishing new dens and having new litters of kittens in Kluane. Food is abundant for lynx in the study area, and researchers expect big families again this year.

Photo and post by Darcy Doran-Myers.

Owl Calls 101

This is the time of year to get outdoors and listen for owls calling. From mid-March to early May is owl breeding season in northern Alberta, so they’re actively calling to defend their territories. In previous years, I would be out right now doing owl surveys for my PhD research, but this year I’m stuck in my office trying to finish writing my thesis. You may not have seen very many owls, but they are out there, and you’re far more likely to hear them than you are to see them. Owl species have easily recognized calls, and learning them is pretty easy because they are so distinctive. So for all of you that are interested in learning owl calls or heard one recently and want to find out what species it is, here is an easy guide to owl calls! Below are details for species found in northern Alberta with clips from recordings I’ve collected during my PhD research over the past few spring seasons.

For best listening of these clips use headphones and increase the volume if need be, some clips are more faint than others‎.

Great horned owl

You all know this one! This is probably the most typical sounding owl call. It consists of 4-5 hoots in a distinct pattern. Both the female and male will call in duets, and they’re relatively easy to tell apart, the female call is a bit higher in frequency (i.e. pitch) than the male. Great horned owls are very common, so you’ve got a good chance of hearing one. They are Alberta’s official bird, a great choice considering they are found everywhere in Alberta and in almost every kind of habitat. In the first clip you can here a female Great horned owl calling very close, and in the second clip you can hear a male and female duet:

Great horned owl female:

Great horned owl male and female calling in a duet:

Barred owl

Barred owls will also call in duets, though it’s harder to distinguish the male and female calls of this species. Their typical territorial call is the two-phrased hoot, commonly referred to by its mnemonic: “Who cooks for you, who cooks for you all?”

Have a listen to this clip and see if you recognize this call:

Barred owl two-phrased hoot:

Another call that can be often by heard is the ascending hoot, this call has a similar ending as the two-phrased hoot. Here is a clip of what that sounds like:

Barred owl ascending hoot:

 

Great gray owl

This species of owl has the lowest frequency call of all the owls found in northern Alberta. It consists of several low hoots in fairly rapid succession. Take a listen to this clip of a great gray owl male calling:

Great gray owl male calling (with a boreal owl calling in the background):

The female great gray owl will also give a ‘whoop’ call, this isn’t very commonly heard, but it sounds pretty neat. Here’s a clip of the ‘whoop’ call:

Great gray owl female ‘whoop’ call:

 

Boreal owl

This species tends to call quite consistently. They are generally found in coniferous forest and are relatively common in the boreal forest of northern Alberta. Its call sounds like a trill:

Boreal owl call:

 

Northern saw-whet owl

The sound of this species call sounds like the backup beep of a truck reversing:

Northern saw-whet owl call:

 

Northern pygmy owl

This species is more commonly found in the western part of the province in the foothills and mountains, however I have heard them in northeastern Alberta as well. This is Alberta’s smallest owl species. They are active and hunt during the day and can be heard calling during the day as well. This species call is quite similar to the Northern saw-whet owl but with greater spacing between the hoots:

Northern pygmy owl call:

 

Long-eared owl

This species’ call is probably the most boring owl call, but it’s exciting to hear them because they are not too common. It gives a series of simple hoots that are fairly widely spaced out:

Long-eared owl call:

 

Julia Shonfield is a PhD student in Erin Bayne’s lab researching the impacts of industrial disturbance on owl habitat use and distribution in relation to oil and gas infrastructure in northeastern Alberta. For her research she conducts owl acoustic surveys and has focused on three of the species mentioned above: great horned owls, barred owls, and boreal owls.

Field Fun Friday

What do -38°C, a spacesuit and a wooden post have to do with songbird research?
I could only hold the camera for a couple seconds before my fingers froze. My field partner, Logan, and I had just snowmobiled a half an hour from our truck parked on an ice road ~80 km south of the Nunavut border, in the tundra of the NWT. We were not actually wearing spacesuits, but our big onesies, snowmobile helmets and steel-toed winter boots made it look like we were. Our task was to collect acoustic recording units (ARUs) deployed by Environment & Climate Change Canada (ECCC). The ARUs were deployed last year when the ice road was open, but started recording in the spring, after birds had arrived. Winter is the only time this northern boreal/tundra transition area is accessible. 100 ARUs, mounted on trees and wooden posts (when there are no trees), span a 400 km south-north transect along the ice road. After retrieval, recordings will be analyzed to identify bird species. This marks the start of a long-term monitoring project to identify and track the northern limits of songbird ranges, a topic of great importance in the face of a changing climate. Students from Dr. Erin Bayne’s lab collaborate with ECCC on songbird research using ARUs.
Collaborators: Samuel Haché (Environment and Climate Change Canada)
Location: Tibbitt to Contwoyto winter road, Northwest Territories

-Post and Photo by Emily Upham-Mills

Climate Change in Kluane

How Warming Is Profoundly Changing a Great Northern Wilderness

Kluane Lake. Photo: Darcy Doran-Myers

Several of our projects are based in the Kluane Lake region of the southwestern Yukon. Researchers there have recently observed the first case of “river piracy” caused by anthropogenic climate change. The article linked above explores river piracy and other changes in Kluane that may be attributed to climate change. University of Alberta ecologists Stan Boutin and David Hik are featured in the article.

Winter Fieldwork in the Yukon

The winter! the brightness that blinds you,
The white land locked tight as a drum,
The cold fear that follows and finds you,
The silence that bludgeons you dumb.
The snows that are older than history,
The woods where the weird shadows slant;
The stillness, the moonlight, the mystery,
I’ve bade ’em good-by—but I can’t.
– Robert Service, “The Spell of the Yukon”

Field assistant Bailey, Kluane resident Peter Upton, and Bubba the dog snowshoe across the ice on Kluane Lake.

I spent January of this year in the boreal forests of Kluane, Yukon. My goal was to collect pictures, fur samples, and tracks of Canada lynx in order to estimate density of lynx in the Kluane area. My Master’s project compares methods of density estimation to improve lynx research and management. Every few months I head to my field site in Kluane. I have experienced every season of the year in the Yukon, from the midnight sun in summer to the deep dark and cold of winter. No time of the year is quite like January. 

Most of my time in Kluane, regardless of season, is spent hiking. This becomes particularly challenging in winter. This year, temperatures dipped to -35 Celsius and snow was thigh-deep in many places. Bailey (my field assistant/ hiking buddy) and I looked to lynx for advice on how to traverse long distances in deep snow. Lynx have disproportionately large feet, making them look funny in summer but helping them keep up with their prey in winter. Their feet function as snowshoes to distribute their weight and help them float on top of the snow. So, Bailey and I got some snowshoes. Not just any snowshoes; modern, lightweight snowshoes were ineffective in snow that deep. In order to make it to all our remote cameras and fur snag sites, we had to borrow extra-large, old-school snowshoes from a local outdoorsman. After a steep learning curve where we learned to walk without tripping (sometimes), the snowshoes became indispensable to our everyday hikes. 

Bailey and I in our snowshoes, on a long hike through a frozen creek bed. We set out this day to collect lynx fur samples from a snag. (Photo by Lindsay Potts)

Cold temperatures were less easily dealt with. Lynx grow big fur coats every winter, with a beard around their neck for a scarf and thick fur between their toes for boots. All Bailey and I could do was outfit ourselves in the human-made substitutes. No matter how much we layered up, we still lost heat throughout the day and had to manage it as best we could. When temperatures were low, lunch breaks to eat our (frozen) sandwiches were limited at five or ten minutes, or until the cold caught up to us. Taking off our mittens even briefly to check cameras or to make a note was painful. Camera screens wouldn’t work, handheld GPSs would turn off mid-hike, and even pen ink would freeze. The Yukon cold did not make our fieldwork easy.

A Canada lynx notices a remote camera set atop a ridge in Kluane.

Despite the deep snow and the deep cold, Bailey and I headed outside each day to take advantage of every hour of daylight available. A key lesson that I learned this field season is that tough conditions are not as tough when you have a friend by your side to experience it all with you. Long sunrises and sunsets, Northern Lights to light up the night, and expansive white landscapes can help counter the extreme conditions with extreme beauty. And the real reward for the tough times was a lot of data. We collected about 250 pictures of lynx and 100 fur samples for analysis in that month. Every successful camera or fur snag and every lynx track in the snow is another piece of the puzzle to understanding lynx populations and improving our management of an ecologically, economically, and culturally important wildlife species.

The sun rises at 10 AM and lights up the sky above the Alaska Highway.

I will return to Kluane for the last time in June. I look forward to experiencing yet another side of the North. By June, everything will have turned from bright white to bright green. The winter challenges of cold and snow will be exchanged for mosquitoes and mud. Long days will keep me outside for hours on end, and I look forward to returning to camp every day tired and happy. But I will certainly miss the Kluane winter and everything it offers. Again in the words of Robert Service:

There are hardships that nobody reckons;
There are valleys unpeopled and still;
There’s a land – oh it beckons and beckons,
And I want to go back- and I will.
– “The Spell of the Yukon”

Dream team.

Darcy Doran-Myers