This entry details a portion of my thesis work at the University of Alaska Fairbanks, and is intended to communicate the findings of that work in a four part series. You are reading part four examining the likelihood of competition between wolves and humans. In order to make the article concise, you may review the general background of this work in part one. I have truncated the background and methods of this work and focused on a portion of the results.
In parts two and three of this series I have been examining where humans in the Yukon Flats, Alaska are traveling to harvest moose and where/how wolves are traveling to harvest moose. A key finding of human access was that humans are mostly operating within 1500 meters of navigable water. During our wolf study I found that travel was based around river corridors. Based on this, I will conclude this series of articles by examining the “Beaver Creek” pack which overlapped strongly with navigable water.
I wanted to begin to understand the likelihood of competition around navigable waters for moose between humans and wolves. Remember, moose exist at extremely low densities and humans and wolves depend on them as a food resource. Therefore, I believe understanding competition is particularly important. To understand the likelihood of competition, I applied my model of human access and overlapped it with wolf locations. I found that 75% of wolf use locations fell within the human access model.
My analysis does not contain temporally overlapping data. Wolf habitat selection may differ in September and October when humans are hunting moose. Wolves could also rely on other prey species other than moose during that period. Also, predation in the Yukon Flats extends beyond wolves. Bears take up to 85% of moose calves each spring. As such, my conclusion is just the beginning research for future biologists in the region. A complete analysis would encompass all predation on moose, be spatially and temporally overlapping, and would evaluate how many moose which are predated could be taken by humans. I hope you have enjoyed this four part series! A full copy of the thesis can be obtained by contacting me. Feel free to do so!
This entry details a portion of my thesis work at the University of Alaska Fairbanks, and is intended to communicate the findings of that work in a four part series. You are reading part two. In order to make the article concise, you may review the general background of this work in part one. I have truncated the background and methods of this work and focused on a portion of the results.
How do you get to a resource? Well, the simple answer is you “access” them. Depending on what you are trying to achieve, access may mean walking through the door of your local grocery store, driving onto a frozen lake and drilling a hole to jig up a fish, or driving a boat up a river to harvest a moose. The last example speaks directly to subsistence use patterns of communities in the Yukon Flats, Alaska. The objective of this part (specifically Chapter 1) of my study was quantify rural hunter access in Alaska.
Let’s take a step backward quickly to look at why access matters. Game levels are traditionally managed to create yield for hunters, but it is critical that game populations be accessible to hunters. In the huge area of Alaska, creating high game densities in a remote region may have minimal benefit to hunters. Outside of Alaska, the effect of access on game populations and hunter success is not well understood, but increased access in Ontario may decrease moose, increased access in Idaho may increase elk mortality, and hunters in Minnesota concentrate their efforts within 0.8 km of roads 98% of the time. These studies suggest that access is important, but within the Arctic access has not been quantified despite being important for hunters, particularly those with a subsistence lifestyle.
It is important that game managers understand how many animals are being harvested to aid in setting regulations. In Alaska, this is accomplished by reporting harvest via a “harvest tag”. However, under-reporting of harvest via the harvest tag system is high in the subsistence communities of the Yukon Flats. This is due to a variety reasons centering around culture practices and feasibility of reporting. Within those communities, moose hunters are allowed one bull moose per season, and hunting most often occurs along rivers in September and October.
To understand where moose hunters are harvesting moose, I used an interview dataset collected in 2005 and 2007 by the Council of Athabascan Tribal Governments. The interviews were in conducted in five subsistence communities including Fort Yukon, Beaver Creek, Circle, Arctic Village, and Birch Creek. In the interview process, interviewees recorded harvest locations of moose on a topographic map. Based on that we determined they utilized rivers, a hunting method that is well documented in other research. However, the data allowed me go beyond just determining river use. I wanted to know : how far were users traveling from their community and from the river to harvest moose?
I designed a method to quantify hunter access. I measured the straight-line distance of the harvest points from their community of origin, and the distance from the rivers. The idea behind this is that the hunter moved up river to a certain point, and then moved away from the river a certain distance. I grouped the resulting distances into five groups, and created a buffer around communities and rivers based on those distances. Within the buffers, I developed an “access index” with the goal of understanding the likelihood that a hunter would utilize an area. The access index was calculated as the number of points that fell inside of a buffer divided by the total number of points up to the edge of that buffer. So, based on that the maximum achievable value was 100% and either existed near community, or near the rivers. In effect, 100% means that 100% of the time, hunters were willing to travel that distance to harvest a moose.
The approach that I took was novel, and yielded some useful results. We found that on average hunters were traveling 0.9 ± 0.6 km from rivers and 47km ± 32km from their communities. Harvest was centered around rivers, and was happening most frequently near rivers. Some useful results!
There are a few ways that this model may be applied. First, I applied a region density of 0.0016 bull moose per square kilometer (remember, there are VERY low moose densities) to estimate the number of legal moose that are available to moose hunters. Based on hunter success of 27 – 46%, I estimated that 98 – 176 moose are harvested by hunters annually. Those numbers fell into the reasonable range of reported harvest in the region. Seeing as that’s the case, this method could help managers understand the amount of moose harvested, instead of relying on the extremely (regionally) variable harvest ticket system. Since this model enables an estimate of the number of animals taken around an access corridor, it could be used in other hunting systems where access is important. For instance in Alaska if a new road was created, how many moose would be harvested based on the new access. In Idaho, how many elk would be preserved if a road is closed?
Overall the results of this study have applicability within my study system, other subsistence systems in Alaska, and more broadly to regions where harvest of game is linked to access. It demonstrates a novel method, and the results that can be gained through an interview process. In the next portion of this series, I will be examining wolf movement in this same area, which yielded some great results.
*The entirety of this work is in review with the Journal of Human Dimensions of Wildlife
This post starts from the first step up the bank of the the Porcupine River to Joe’s cabin. We were relieved to see the flood waters had not topped as far as the cabin, although plenty of water had still gone over bank-full height and flooded the lower terrace of his property. I hauled the gear from the boat as Joe set about opening the cabin.
Since there was no flood damage to be repaired, we started a leisurely existence at the cabin consisting of small projects (what Joe (and ironically my Dad) called “puttering”), eating, sleeping, and reading a book. Between sessions of tackling Alex Haley’s “Roots”, I went for birding walks around the cabin, and ventured into the local slough. As needed, we traveled a few miles upriver to a clear-water stream and filled five gallon pails full of water for filtering.
This peregrine falcon is a yearly nester in the cliff across from Joe’s cabin and through the years, the young chicks have learned to hunt from the treetops around the cabin.
This Chipping sparrow was a new bird for the cabin, and an unusual one for so far north.
The chipping sparrow sang its heart out and chased all other birds away from its perch.
A small pond behind the cabin was home to this green-wing teal
Beautiful and close looks at this green-wing teal were a treat!
American widgeon were very common along the river, their call of ‘”wee wee wee” was often heard just below the bank.
In Fort Yukon I was fortunate to capture this Northern Blue Butterfly perched on a Wild Sweet Pea
This cross fox is an unsual color phase! It’s actually just a red fox, but an incredible treat to see!
A shot of the cross fox checking me out.
White-crowned sparrows were a common bird. Every morning, all day, and all night a particularly vocal one would sing outside of the cabin.
A cliff nesting raven sits over it brood.
Blue bells are a common and beautiful flower in the region. Here they are also pictured with Jacob’s Ladder.
Yellow cedum on top of Wolf Point
One of the greatest lessons I learned on the trip came from Joe when he said “Just because you live in the Bush, doesn’t mean you have to do without”. Certainly over the years, through sweat, countless trips up the river and through the air, he and his wife had transformed the cabin into a home away from home. When living there permanently, the four garden plots just out the door provided fresh vegetables. A solar panel amply charged a battery pack in the cabin allowing for electric lights and a water pump for a shower. In fact, it was possible to take a steaming hot shower each day if one desired! A large kitchen, bedroom, eclectic and huge library, and centralized wood-stove made living there extremely comfortable!
The cabin was crafted by Joe and took four years to build. One year to cut the logs, strip the bark, and let the logs season. Another season to put up the walls and cut the lumber for the roof, and a couple more to finish the cabin entirely. All of the log-milling was completed with a chainsaw. For his first and last cabin, Joe did a perfect job. The cabin is in pristine condition, and I marveled at it a lot!
Aside from birding and reading, I enjoyed the views of the river. Life on the river changed constantly. After the first couple of days the water receded enough that a prominent gravel bar emerged for the first time since the flood. A flock of twelve long-tailed ducks repeatedly flew up river and drifted down. Each cloudless night the moon rose over the far banks, and the low light of a mid-night sun lit up the bluffs across the river in orange and gold. Life was good on the banks of the Porcupine.
I did my best to capture video of life around the cabin. Throughout the days at the cabin I captured some timelapse and clips of wildlife. The music is pretty relaxing – you can check out the video here:
Although not all experiences in the bush need to be plush and care-free like this trip, I certainly have a new viewpoint that such an existence is even possible. Just because you live in the bush doesn’t mean you have to do without!
I was excited to head far into the Alaskan bush by river to help a friend open his cabin for the season. Almost a week of packing led up to the Wednesday we were supposed to leave. However, when the middle day of the week arrived, high water reports from Fort Yukon and the Upper Porcupine River were ominous. Record snowfall in Old Crow, Yukon Territory, had swollen the giant river systems. They were far above travel-able levels, and over-flooded banks were pulling dangerous amounts of debris, ‘drift’, into the river. Our final destination was 220 river miles through the high water and drift of the Yukon and Porcupine Rivers, and the experienced judgement of Joe dictated that we would wait a few days before heading up to his cabin. Four days later the river had dropped to acceptable levels. It was go-time : the river was saying so!
Before I get into some of the stories of the trip. Come along on the trip with me by watching this video:
The notion of taking a boat far into the Alaskan bush is exciting! A long-time resident of the bush, Joe was anxious to open his cabin, and assess his estate because bears, humans, or weather can all impact an unoccupied cabin. The boat-trip up river started in Circle, Alaska on a cloudy day. As we headed downstream in the Yukon River, we quickly entered the Yukon Flats National Wildlife Refuge. This expansive refuge is critical, critical habitat for breeding waterfowl and birds. In fact, the refuge hosts 150 species of breeding birds from 11 countries, 8 Canadian provinces and 43 of the 50 states. That’s remarkable diversity!
The Yukon Flats is aptly named. As we cruised along in the boat, the shores were a steady patchwork of riparian habitat consisting of willows, birch, and spruces. There was no perceptable climb in elevation. The fast, high water of the river kept progress slow, and Captain Joe was constantly vigilant for pieces of drift. Three foot-long sticks and entire trees were coming down the river at the rate of several or more pieces per minute. Hitting a small branch may result in a dented prop, but a large stump could have ended the trip. By the time we reached Curtis Slough to stop for the night, the intense driving had drained Joe (and rightfully so!). Overall we made it about 135 river miles from Circle.
We pulled into a small log cabin along the banks Curtis Slough, hoping to spend the night. The traditional landing was underwater, but I jumped ashore with the bow rope and headed to tie off to a nearby tree. I glanced at the cabin, and immediately saw that the plywood door had been torn in half; peeled back like the lid of a sardine can. “Hey Joe”, I stated, “A bear broke into the cabin, by tearing the door off”. “Ok, does it look fresh?”, he questioned. I assessed the raw wood in the torn door from 25 feet away and responded, “yup, sure does!”. By that time Joe had climbed up with Delta, our dog companion. Delta moved towards the cabin and sniffed the door; her demeanor immediately told us that it was a very fresh break in, and then I heard a can rattle from inside. The bear was still in the cabin! In two flicks of a lamb’s tail we were in the boat and headed across river to camp on a more desirable (bear free) gravel bar. Joe, knowing the owner of the cabin, made a satellite phone call to inform them of the situation. Remarkably, this bear encounter was the only one of the whole trip!
The next morning we continued up the Porcupine River, and moved out of the Yukon Flats and into the Arctic National Wildlife Refuge. The Arctic NWR is the largest piece of land in the refuge system, and home of the Porcupine Caribou Herd. No longer in the flats, we saw a mountain on the horizon! More significantly, that mountain was the beginning of the rocky ramparts which would line the river for the rest of our trip. The tall and colorful ramparts and bluffs of the Porcupine Rive were a welcome contrast to the Yukon Flats! As we moved through the landscape, the smile of enjoyment could not have been erased from my face by the spray of a skunk. The area was absolutely stunning; on a small scale, I was reminded of the Grand Canyon. Red, orange, and black rock walls rose high above the water. The bluffs held countless caves and spires shaped by wind, ice, and snow. The refuge of the high cliffs provided important nesting habitat. As we passed we noticed nests of golden eagles, ravens, and a peregrine falcon protected on all sides by the vertical rock faces.
Two hundred and twenty-two miles upriver we passed the final bluff across from Joe’s cabin. The boat swung around towards the opposite bank and soon I tied it off onshore. Already I felt connected to this beautiful region, and was excited to spend the next five days exploring it. The next chapter of cabin life to come soon!
Oh, and as one last, unrelated note the blog turned two on May 28th. Thank-you ALL for your continuing support. Your feedback, comments, and enjoyment of the material here is much appreciated!
Spring is in the air! In Fairbanks the trees are leafing out and the days are long and warm. Even now there are only several hours each day that are dark. 150 miles north of here, Fort Yukon is just starting to wake up for the season. I got to spend some time up there (it was much different than the last time I was here) and I made it a point find some of the things which represent spring. All around birds, plants, and humans are celebrating the season.
As an avid birder I am interested in the new migrants which arrive in the spring. The Yukon Flats National Wildlife Refuge was set up to harbor waterfowl; they flock there by the 10’s of thousands. The small ponds dotting the landscape are ideal for brooding and raising chicks. My waterfowl list for the trip included a dozen species. Passerines like yellow-rumped warblers and dark-eyed juncos were abundant. These two species (e.g. yellow-rumps and juncos) are some of the first to show up for spring, and are a great indicator the season is here for good!
Waterfowl are pursued by Subsistence Hunters as they migrate north. Each spring it provides a new source of meat (in a region that depends on 85% of its meat from the wild) to replenish stores until the salmon arrive in July. In particular white-fronted geese, canada geese, and snow geese are shot. When I was touring around the village I found a place where the birds were plucked. An unusual (for the region) strong north wind blew the features onto the trees and ground. It looked like a massive and violent pillow fight had been staged there. I got to share in the bounty of goose soup, which was delicious!
The breakup for the Yukon River is a celebrated event by all who live on it and depend on it. River travel is fast, and gives residents access to some resources which have been unavailable since the previous fall. Although the Yukon has been clear for over a week large chunks of ice on the banks demonstrate the power it took to push them there and are a testament to how thick/resilient the ice can be! Over 8 feet of ice in some regions.
The leaves have not appeared on the trees yet, but spring pasque flowers, and willows have started to bloom. The bright yellow stems of the willows caught my eyes and were at stark contrast with the surrounding gray bark of the aspens. Especially eye catching was the contrast of the yellow stems and the blue sky! The base of the willows were dirty and marred where river water had washed over them just a few days earlier.
Spring is certainly in the air in Fort Yukon. Overall, it’s one of the ‘last’ springs to arrive in North America. I leave you with a still, spring sunset in one of the river braids of the Yukon. I hope you are having a great spring!
I have spent my last couple of days in Fort Yukon, Alaska. I was gathering data for my thesis as well as some data to fulfill some granting deliverables. As proof of that I offer you this key piece of evidence:
This was my first time into truly remote Alaska. In fact, Fort Yukon has no roads into it. It is far from the system of pavement which means your options are dogsled, snowmachine or airplane. I chose the latter. An interesting tidbit – villagers do drive cars, and the cars get there by barge when the Yukon is open and flowing. The flight up to Fort Yukon was very special because I got to experience the sunrise coming over the mountains. I attempted to capture the sunrise in my flight to Fort Yukon video. I will just warn you that the technique I used was a bit ‘experimental’. I wanted to shoot the video as a timelapse so I could get the sun rising as well as the plane in flight. That part worked; the sun definitely rises and the plane certainly moves. However, I didn’t account for the jerkiness of the plane when using a timelapse. I’ve done my best to edit to a smoother product, but you’ll still get tossed around a bit! It isn’t for the weak stomach :p. For a ‘smoother’ version of the flight, have a look at the flight from Fort Yukon to Fairbanks at the bottom which I think is a very cool video.
Small Antedote. For those who know my woes with laptops. I got off the plane in Fort Yukon and jumped into a vehicle with a stranger. Her name was Hannah. She thought I was someone else and I thought she was just picking me up for the office. So, off we went, but neither of us knew where we had to go :S . It didn’t take me long to figure out that I should head back to the airport and meet up with my actual pick-up. I had extra incentive though, I had left my laptop ON THE PLANE wedged between the plane and the seat. I talked to the Fort Yukon office and they weren’t able to contact the plane, but did put in a contact to the next village. That was lucky enough. On top of that I was fortunate that my plane was to return in 1.5 hours to pick up some freight before heading back to Fairbanks. When they arrived at 11:25 (and yes, minutes count when you are watching the time so closely) I was OVERJOYED to see the pilot step out of the plane with my laptop. Crisis averted!
THE FLIGHT TO FYU (Smoother flight at bottom 🙂 )
MY GRADUATE WORK
The purpose of this trip was to gather data for my graduate work. I’ll put down my current proposed thesis, so someday I can look back and read this. I’m sure I will have a good laugh. Currently I’m looking at competition between humans and wolves for the common resource of moose, in the Yukon Flats of interior Alaska. In this area moose populations are as low as anywhere in the U.S. or even the world. These low moose densities are unexpected, with exceptional habitat existing throughout the Yukon Flats. Moose in this system are thought to be controlled by wolves, which keep them at densities well below the carrying capacity of the land. This has been dubbed the ‘predator pit’. To get at competition I’m utilizing a collared wolf dataset through collaboration with the Fish and Wildlife Service, as well as Traditional Ecological Knowledge (TEK) from the Council of Athabascan Government. Those data – which comprise the purpose of my trip to Fort Yukon- were collected during interviews in the mid-2000s and serve as a useful tool to understand landscape usage by the villagers. My intent is to understand where they harvest moose. By comparing the two datasets using resource selection functions in GIS I am hoping to gain insights into competition based on how humans and wolves use the landscape when pursuing moose. I can’t thank enough CATG and FWS the opportunity to work with their data.
FORT YUKON AT NIGHT
Fort Yukon is a really cool place. Due to its location (the middle of nowhere) the night-scapes that occur there are second to none (but probably tied with many). I went out into the night and wandered around Fort Yukon passing through snow covered trees and by quiet houses. The full moon lit the landscape up so that in these pictures it appears to be daytime. You certainly could have read a book by it!
Unfortunately I did not get to partake or see much of life at the Fort Yukon. I spent most of my time indoors going through data and maps. However, before leaving I got a small tour of town. Here’s just some of the things to catch my eye.
By the way, I had this pronounced to me many times. If there is someone reading this who could phonically write it out for me that would be a huge help. I’m having a hard time getting it.
THE FLIGHT TO FAI (smoother video! :D)
The flight home was a much different flight. It started out clear, but then below us a cloud bank formed. However, just after we got past the Yukon Flats (as denoted by a rising mountain range) the skies cleared again and created a beautiful juxtaposition of clouds, light, and shade.
On the way home I met a really unique and talented individual. His name is Donovan Felix and he is currently on a mission to revive native tanning practices (brain tanning) in the interior. He was pulling on a chunk of moose hide while the flight was happing to make it supple part of his cargo for the trip was a caribou hide he had just been given. He specializes in caribou, but in recent years has started tanning moose asl well. Donovan is obviously very passionate about what he does and his mission. He was constantly giving me tips on how to tan hides, and what he was doing with the hide. In fact, what he is is doing is so novel that he was covered by www.culturesurval.org . Click the link to read the story. Also, if you are interested in learning about brain tanning UAF holds a workshop! http://www.uaf.edu/iac/traditional-learning/animal-hide-tanning/. This is certainly something that I will be looking out for this spring. I ended up giving Donovan a ride to town after we got off the plane.
The planes that bring people back and forth are not that big. They are carry as much freight and cargo as they do people. At each stop cargo is loaded and unloaded quickly and planes do not stay around long. I must say though their service is excellent and is needed by the villages. During my ride to Fort Yukon I sat next to Dr. Pepper and milk. Here’s a picture of the plane that got me back to Fairbanks.
Here’s the last bit. I’m really happy how this video turned out of the flight to Fairbanks. Have a look and let me know what you think!