Category Archives: Science

The Hooligans of Haines

The Great Hooligan Run

Alaska is known for its runs of salmon, but each year in the spring an equally impressive and ecologically important run of fish ascend the streams of Southeast Alaska and as far north as Norton Sound. The small, silvery fish, provide bountiful food for birds, bears, and people and signify that spring is here. I had the opportunity to observe the abundance of life that greet the Hooligan in the Chilkoot River, just north of Haines, Alaska.

Thousands of gulls, dozens of eagles, and tens of Stellars Sealions gather at the mouth of the Chilkoot River to feed on Hooligan.

The Chilkoot River system where I stood watching schools of Hooligan is surrounded in spectacular scenery. The 70 yard-wide river valley is dotted with large boulders which were deposited there by retreating glaciers.  High mountains that rise along each shore are covered with snow and feed the cold-water system for several months, until mid-summer.  During April and May, its shallow, clear waters, house thousands of shimmering gray shapes. Hooligan (Thaleichthys pacificus, also known as “eulachon” or “candle fish”) return by the hundreds of thousands to deposit their eggs.

The Ecology of Hooligan

Hooligan are anadromous fish, meaning they spend most of their adult life in the ocean, but return to freshwater to breed. The most well-known example of anadromous fish are salmon species, however Hooligan do not necessarily return to the same river like salmon do.  The timing of their spawning run is determined by water temperature and hence shifts later into the year as you move from Southeast Alaska up to the western coast. After breeding, a majority of Hooligan die, but there are some fish that return to the river. Why only some die after spawning is just one of the many things that are not known about this fish. For instance biologists are also unsure what effects the size of the run which has varied highly in recent years. In the Chilkoot River, the run was estimated at 300,000 in 2015 but >1.8 million in 2016. That is quite a difference! After talking to the locals, it sounds like this year’s run in the Chilkoot was strong and echoed the strong run of 2016.

Hooligan Run, Alaska, Haines, Chilkoot
Thousands of Hooligan swim in the shallow waters of the Chilkoot River.

The Effect of Hooligan

You do not really have to see the effect of Hooligan to understand their importance to the ecosystem – closing your eyes and listening will probably tell you the story that needs to be told. Envision the sound of the lapping surf at your feet and the hum of the wind past your ears. Now layer in the raucous sound of thousands of gulls from multiple species raising from the beaches in an excited chorus. Add the grunting, bold, bellow of an adult, bull, sealion. The chir and ki-ki-ki of many bald eagles. The whistle of a goldeneye’s wingbeats. This is the audio picture of the Hooligan run and I was astounded by its magnitude.

Hooligan, Chilkoot, Haines, Alaska
A rainbow high-lights the amazing scenery around Haines. Gulls, Eagles and Stellars Sealions feed on Hooligan at the mouth of the Chilkoot River.

It was obvious from watching the behavior of various animals that they had mastered the art of catching an easy meal and nutritious meal. Hooligan are an important food source because of their high energy value. Dried Hooligan are so oily they were traditionally burned by Tlingits as candles. One of the most impressive behaviors was how Stellar’s Sealions herded the fish against the shore. Working together the sealions breached from the water in a wall to spook the fish upstream. The breaches ocurred in synchronized sequences, with the whole body of the sealion coming out of the waters, followed shortly by another individual. If the maneuver was successful a large school of finned-dinners would be pinned against the shore and a feeding frenzy ensued. Swirling waters and flippers were all that was visible of the fast-moving sealions as they snatched up fish below the water’s surface. The gulls were equally effective at catching Hooligan and dove repeatedly into the water, coming up with a fish frequently. After successful dives, the fish protruded from the gull’s mouth and were consumed on the wing . It’s amazing to think they could swallow them at all! The bodies of the fish were not the only thing being consumed. Countless eggs (they lay up to 30,000 per female!) were strewn across the beach, stranded as the tide went out. I watched a tiny, Least Sandpiper scoop up mouth-fulls of the eggs, providing a high-calorie caviar snack.

Hooligan, Chilkoot River, Haines, Alaska
A Bonaparte’s gull consume a Hooligan on the wing moments after snatching it from the river.

I wish that my time at the Chilkoot River could have been longer. Two evenings observing it just did not seem like enough! What any one-person takes away from an experience can vary vastly. My viewpoint is one a naturalist and scientist looking to sponge knowledge and learn from what I observe. I hope that you, the reader, can see it some day to see what you learn. Alaska is known for its larger-than-life wildlife spectacles, and in my opinion the Hooligan run and the abundance of life it creates is an experience that should be seen, felt, and heard by anyone that appreciates the wild places of earth.

Sources (also used in hyperlinks through the article):

  • http://www.adfg.alaska.gov/index.cfm?adfg=eulachon.main
  • http://traditionalanimalfoods.org/fish/searun-fish/page.aspx?id=6448
  • http://www.subsistence.adfg.state.ak.us/techpap/tp213.pdf
  • https://www.afsc.noaa.gov/Publications/ProcRpt/PR%202006-12.pdf
  • http://www.alaskapublic.org/2016/04/28/hooligan-make-strong-return-to-chilkoot-and-chilkat/

The Pine Marten Transplants of Chichagof Island

When I think of the American Pine Marten (Martes americana), it invokes an image of giant, rotund spruces and hemlocks in an old growth forest. In my mind, the lithe body of a Pine Marten scurries around in the branches perhaps a hundred feet from the forest floor in search of a red squirrel or bird’s nest. A small squeak indicates that the small mustelid has connected with its prey. This vision could be considered “classic” in the fact that martens are strongly associated with mature, old growth forests (Greg 1995). In fact, their dependence on old growth forests is so strong that traditional logging methods have been cited as a driver of large scale declines of marten populations (Davies 1983). In some regions of Southeast Alaska marten are still abundant, and in general the Tongass National Forest offers great habitat for marten. However, they are most often found on the mainland, and I was told by a friend that they were introduced to Chichagof Island by people. That tidbit of information intrigued me, and as I dove into Pine Marten history on Chichagof I was very interested to find out a marten I crossed paths with is a descendant from a small introduction of intentional transplants.

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Transplanting wildlife to new areas in Alaska has been going on since the Russians began to settle  here (Paul 2009). Frequently transplants happened on the Aleutian Islands or the islands of Southeast Alaska and often the incentive revolved around economic opportunity. A well-known example of this is the transplant of Blue Fox to the Aleutians so they could be farmed and harvested for trapping.  The fox were responsible for extirpating several species of birds from the islands.  Over the years many species including Caribou, Sitka Blacktail, Mountain Goats and Elk have been introduced to new areas throughout Alaska. The first martens were introduced to Chichagof Island in 1949 to create a population for trapping (in fact Pine Martens are still Alaska’s largest fur market earning 1-2 million annually (Alaska Department of Fish and Game)). By 1954, 21 marten had been introduced to the Island and despite the low number of starting individuals, their numbers climbed rapidly in their new environment. It is estimated in 2006 over 2,200 marten were trapped on Chichagof Island. It’s a remarkably successful population here!

Blue Fox
It was fascinating to see this account from the early 1900s of Blue Fox farming. At the time it was implemented as a branch of the USDA. You can read the full text at : https://archive.org/details/bluefoxfarmingin1350ashb

Since transplants can have negative effects on resident populations, did the transplant of marten to Chichagof Island impact populations there? Anecdotally I have been told that Dusky Grouse (Dendragapus obscurus) numbers have declined on the island and that Northern Flying Squirrel (Glaucomys sabrinus) are not as abundant as they used to be.  Certainly each of these prey items are consumed by the martens. Buskirk (1983) found birds and squirrels made up a strong majority of the marten’s diet in Southcentral Alaska, but that voles, mice, and shrews were the most important items in the diet.  On Chichagof Island, the diet patterns are the same, although Ben-David et al. (1997) found high variation in the autumn and the presence of salmon and crab.  In the summer a marten’s diet may be made up 80% of birds and squirrels. Marten populations are normally not very large and hence would be unlikely to strongly influence prey, but Chichagof Island holds the highest abundance in the region (Flynn and Ben-David 2004). With these high populations and a diet favoring birds and squirrels, is it is possible that marten populations on Chichagof Island exert a top-down pressure on their prey? I believe based on the effect of being a successful transplant makes it it possible. However, I can find no data on the population trends of Dusky Grouse or Flying Squirrels on Chichagof Island and there are many other factors at play. For instance,  Dusky Grouse may find protection from predators in old growth  and flying squirrels are likely to benefit from old growth structure. Hence, removal of old growth by logging may lead to a reduced population. Rather than conjecture on a speculative answer, I will put it out there that a graduate student and the Alaska Department of Fish and Game could pair up on this venture.

I will leave you with a description of my encounter with an American Pine Marten. On October 16th, Hoonah received measurable snow before Fairbanks, Alaska.  The 14 inches of snow that lay on the ground was the first time Southeast Alaska had beat the Interior to snow in over 70 years. I started up my truck, my wife jumped in, and we headed out the road with the hope of photographing a bear in the snow. The lower elevations were slick and wet. 6 inches of slush lay heavy on the roads, but we made it the 10 miles to the turn towards False Bay. As we slowly climbed the pass the truck seemed to shrink into the ground as the snow levels rose. After only a couple of miles we were plowing snow with the bumper of the truck and it was evident that we would not go much further. The only catch was we could not find a place to turn around. On we drove hoping that our luck held out, when up the road we saw a small figure bound into the ditch. It plowed into a snow drift and then burst back out again. In a flash I was out with my camera clicking away. Pursing my lips I made small rodent sounds which intrigued the inquisitive creature. Turning its head rapidly it dove back into a snow bank and emerged a few feet away. To me it seemed as if the little fellow was simply enjoying the snow rather than doing anything too serious. He wove in and out of cover, posed for me and eventually bounded into the woods in search of greener (or whiter) pastures.

Pine Marten, American Pine Marten, Chichagof Island, Hoonah, Southeast Alaska, Martes americana
American Pine Marten on Chichagof Island near Hoonah, Alaska.

 

Cited:

R. Flynn and M. Ben-David. 2004. Abundance, prey availability and diets of American martens: implications for the design of old growth reserves in Southeast Alaska. U.S. Fish and Wildlife Service Grant final report. Alaska Department of Fish and Game.

Ben-David, M., Flynn R.W., Schell D.M. 1997. Annual and seasonal changes in diets of martens: evidence from stable isotope analysis. Oecologia. 111:280-291.

Buskirk, S.W. 1983. The Ecology of Marten in Southcentral Alaska. Doctoral Disertation. University of Alaska Fairbanks.

http://www.biokids.umich.edu/critters/Dendragapus_obscurus/

Davis, Mark H. “Post-release movements of introduced marten.” The Journal of Wildlife Management (1983): 59-66.

Drew, G. 1995. WINTER HABITAT SELECTION BY AMERICAN MARTEN (Martesamericana) IN NEWFOUNDLAND: WHY OLD GROWTH?. Dissertation.

Paul, T. 2009. Game transplants in Alaska. Technical bulletin #4. 2nd Edition.

Schoen, J., Flynn R., Clark B. American Marten. Southeast Alaska Conservation Assessment. Chapter 6.5

Ashbrook, F.G. Blue Fox Farming in Alaska. Accessed : https://archive.org/details/bluefoxfarmingin1350ashb 10/27/2016

https://www.fws.gov/refuge/Alaska_Maritime/what_we_do/conservation.html

 

Why Do Whales Try To Fly?

Last week I was floating under gray skies and windless conditions on a whale-watching boat outside of Hoonah, Alaska.  We drifted with engines off while Humpback Whales (Megaptera novaeangliae) fed around a rocky reef a hundred yards that was exposed by a shrinking tide. The distinct kee-kee-kee of hundreds of marbled murrelets, (Brachyramphus marmoratus, small pelagic birds) rang out around us and the bellow of sea lions droned from a distance green channel buoy. Towards that buoy an enormous nose broke through the surface and in a fraction of a second a mature Humpback Whale hung in the air with only the tips of its tail in the water. Its re-entry sent water far into the air with a crash. On its second breach I was ready and captured a series of shots as it arched into the water. My heart was racing as I soaked in what had just happened! Ultimately its leap from the water set my mind turning on why a whale would try to fly at all.

Mature Humpback Whales are gigantic creatures weighing between 45-50 tons (NOAA) and reaching up to 45 feet. I think Whitehead (1985) has it right when he states, “A Whale’s leap from the water is almost certainly the most powerful single action performed by any animal.” He found that a 12-m long adult humpback must travel at about 17 knots (3 times their normal cruising speed) to break the surface and expose at least 70% of their body. The energy required to thrust their entire body comes at an expense of energy, and begs to question about what they gain from it.  It is possible whales breach to communicate with others, to act aggressively towards another whale, to show strength, or to “play” (Whitehead 1985).

Humpback Whale Splash
A huge splash results from the breach of a humpback whale.

A lot of research on aerial behavior has tried to associate breaching with group dynamics. These studies have yielded interesting correlations. Whales breach more often in groups (Whitehead 1985). They were more likely to breach within 10km of another whale. Humpback whales surface activity (including multiple behaviors above surface) increases with group size and also occurred more with underwater vocalizations (Silber 1986). There also seems to behaviors which foreshadow breaching. For instance, breaching often comes after a tail lob. A tail lob is another visual and audio spectacle where the whale slaps its tail against the water.  Since breaching occurs more often in groups, these lends to the notion that it is a form of communication.

For some researchers, time spent on water results in findings that have little explanation. For instance, whales may breach more as wind speed rises (Whitehead 1985). Although support for why that would be is nearly impossible to determine, it has been shown that surface slaps can carry for several kilometers and the amount of sound created changes depending on what angle the whale strikes the water (Payne and McVay 1971, Deakos 2002 citing Watkins 1981). The distance that a breach can be heard is unknown, but it certainly surpasses the visual extent lending to the hypothesis that it is a form of communication, however, what message it conveys is unknown.

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By listening to whale vocalizations (for which humbacks are famous) that occur leading up to breaches, researchers found there is a relationship between the amount of vocalizations and breaches. Male to male interaction and above water behavior were often correlated with increased vocalization between males (Silber 1986). It is likely these vocalizations are aggressive and that males are plying for position or to mate with a female. The subsequent breach is probably an “exclamation” (Whitehead 1985) on the underwater vocalization rather than an attempt to harm the other whale during the breach.  Certainly it would demonstrate to a female the prowess and strength of the male (Whitehead 1985).

Insight into breaching behavior may be gained from researching other percussive behaviors. Deakos (2002) found that pectoral slapping varies with age class, sex, and social position. Females were likely to slap pectoral fins on the surface to indicate readiness to mate, while males often did it to compete with other males without full-on combat. Pectoral slapping was shown to be frequent in young whales and is likely an important piece of their development (I was fortunate to see a calf breaching last year).   However, pectoral slapping and frequent breaches from young and feisty individuals taper off as the whales mature and get older (Whitehead 1985). This likely means it not a form of play for older animals. From these findings in pectoral displays we likely assume that a breach from male, female or young calf means separate things.

Humpback Whale Pec Slap
The same humpback whale that breached also showed off pectoral slapping. The behavior went on for 5 or 10 minutes after the breach.
Humpback Whale Pec Slap
The resulting splash of a pec-slap from a humpback whale.

My review of the science and literature surrounding whale behavior is stumped by the same issue that plagues the field : the true question of “why” a whale breaches is illusive because “what” they are trying to convey is likely different for each whale.  Much like the way that we clap our hands different at sporting events, golf tournaments, at a wedding, or after a concert, whales likely use the clap of the water to communicate different feelings.  Answers are relegated to vaguery due to the inherent difficulty of researching an underwater animal. I can only conclude that whales breach to communicate.  It seems most plausible that humpback whales and other species breach to add emphasis to a message or to get a point across.

Cited:

Deakos. (2002). Humpback Whale (Megaptera Novaengliae) Commication : The context and possible functions of pec-slapping behavior on the Hawai’ian wintering grounds. Thesis.

Payne, R. S., & McVay, S. (1971). Songs of humpback whales. Science, 173, 585-597

Silber, G. 1986. “The relationship of social vocalizations to surface behavior and aggression in the Hawaiian humpback whale (Megaptera novaeangliae)”. Canadian Journal of Zoology. 64(10): 2075-2080

Watkins, William A. (1981). “Activities and underwater sounds of fin whales [Balaenoptera physalus].” Scientific Reports of the Whales Research Institute (Japan).

Whitehead, H. 1985. “Why Whales Leap”. Scientific American.

 

 

An Ivory Gull in Duluth, So What?

What does it mean when one of the least researched and understood marine birds in the Arctic turns up in Duluth, Minnesota 1,500 miles outside of its range? Locally, it ensures a birding rush of in-state and out-of-stater birders eager to see the rare bird, but what does it say about the global status of this unique bird? How can we use its presence to  educate ourselves of human impact on the high Arctic? Is the Ivory Gull (Pagophila eburnea) an indicator species of a greater issue in the Arctic? The suspicion that their unprecedented, 80% population decline over the last 20 years may be linked to mercury suggests they are.

Ivory Gull, Duluth
The Ivory Gull at Canal Park in Duluth sits on the piers a few hundred feet from the human observers on shore.

Population Free-fall of the Ivory Gull

Ivory Gulls are colonial birds, meaning that large numbers gather into groups to breed. By monitoring the nesting colonies of colonial birds, population trends may be established by researchers. However, surveys for Ivory Gulls  were only conducted in 1985 (Thomas and MacDonald, 1987) making it impossible to understand population trends. Compounding the lack of population data, Ivory Gulls are considered to be one one of the least understood marine birds. This is partly due to wintering along the ice pack between Greenland and Labrador ensuring they are not a bird which is in-sight of many people. However, indigenous knowledge has suggested declining populations since the 1980s (Mallory et al. 2003). In light of this, researchers  flew surveys of known nesting islands as well as newly found Islands in 2002 and 2003 and found something shocking. The number of nesting Ivory Gulls had declined by 80% since the 1980s (Gilcrest et al. 2005).

Ivory Gull, Identification
The Ivory Gull is a distinct bird with a blue bill, black feet, and stunning black tips on the wings.

Gilcrest et al. (2005) started to hypothesize at alternative reasons for the lack of gulls. They explored the possibility that the Ivory Gulls had simply shifted their nesting locations. However, a significant move is not inline with the known biology of the bird which generally move less than 1-2 kilometers.  Food sources of fish and carcasses have remained relatively stable in their study area giving them little reason to move. They noted that Ivory Gulls were not seen flying along the survey paths. It seems that the Ivory Gull was truly dying off.

Ivory Gull, Duluth, Minnesota
In Duluth, the Ivory Gull was gracious enough to land close to my camera, offering exceptional looks at the details of this beautiful bird.

 

The Driver of Change

Since the startling revelation of population decline, researchers have been trying to understand why Ivory Gulls are disappearing. It is probable that ice-pack changes and altered forage have contributed to the population decline (Gilchrest et al. 2005), but researchers think a stronger factor is in play . In his interview with the BBC World Service (full interview below) Dr. Alex Bond  hypothesizes that mercury is a leading stressor on Ivory Gulls based on findings that levels of mercury have risen 45 -50 times the levels found 130 years ago. There is strong evidence showing mercury levels in the eggs of Ivory Gulls is significantly higher than any other known marine bird. Braun et al. 2006 found that mercury in the eggs of Ivory Gulls were 2.5 times greater than even the next highest species, and were almost 3 times greater the amount which impairs reproductive success. Where is that much mercury coming from? And how exactly might it effect Ivory Gulls?

Ivory Gull, Underwings
The Ivory Gull in Duluth shows off its beautiful, white underwings.

To understand where the mercury is coming from, its important to know the basics of the mercury cycle. Mercury falls into the oceans from atmosphere pollution originating from coal-fired power plants, or is directly input from Alkali metal processing . There are also natural sources of mercury like volcanic eruptions and “volitilization of the ocean” (USGS 2000).  Once deposited in a waterbody, mercury becomes available to marine animals when it is transformed to methylmercury. Once in the that state, it moves up through the food chain into plankton, and then to fish, and finally to top level predators like birds and marine mammals.  Levels of mercury grows in organisms through bioaccumulation and biomagnifcation. To clarify that jargon, bioaccumulation means that the older you are, the more mercury you have since it is difficult to get it out your system once ingested. Biomagnification means that if you feed higher on the food chain you gain mercury more quickly. Marine mammals like seals have very, very high levels of mercury due to the effect of both bioaccumulation and biomagnifacation. With that information in mind it is easier to understand why Ivory Gulls accumulate mercury; they scavenge on carcasses of marine mammals and feed on fish which have high levels of mercury. They also have a high metabolic rate and consume more fish (Braun et al. 2006).

To date, the effect of mercury on Ivory Gulls has not been studied, but we can gather clues from looking at other species.  Common Loons (Gavia immer) also accumulate high levels of mercury due to eating fish (biomagnification) and having long lives (bioaccumulation). Evers et al. 2008 found a 41% decrease in fledged loon young in parents with >3 micrograms of mercury per gram of tissue compared to those with <1 microgram. They predict total reproductive failure of Common Loons if levels exceed 16.5 micrograms. Based on hundreds of hours of observation, they report that loons with elevated levels of mercury are lethargic and spend significantly less time foraging for food and less time taking care of their young. Each lead to fewer chicks growing to adulthood.  It is important to note in their study that mercury levels of a species change throughout their range due to climate, forage, and many other factors. Transferring the lessons of Common loons to Ivory Gulls, variation in  mercury levels changes are observed in Canada as well; in general levels of mercury increase from east to west in Canada. Although the effect of mercury on Ivory Gulls has not been directly studied and may effect gulls differently than loons, a good hypothesis for their decline is poor parenting and lethargy due to extraordinarily high levels of mercury. Only future research will help tease out the true effect of mercury on their decline.

Ivory Gull, Flying, Duluth
The Ivory gull in Duluth takes to the wing showing off its beautiful plumage and black feet.

When an Ivory Gull shows up in Duluth, Minnesota it is a chance to reflect. Reflect on the beauty of an animal. Reflect on the joy of seeing such a rarity. However, do not miss the opportunity to acknowledge that its prescense is out of the norm of the species and that an unseen driver which we do not fully understand is at play. Reflect on the fact that the impact of humans in a nearly un-inhabited region is undeniable. Human consumption of fossil fuels is depositing mercury into the Arctic at rates which may be directly effecting a species. The Ivory Gull is a red flag, an indicator that things are not right in the Arctic and that we should pay heed to what else may be going wrong that we just have not taken the time to study yet.

Sources:

http://www.bbc.com/news/science-environment-31921127

Braune, B. M., Mallory, M. L., & Gilchrist, H. G. (2006). Elevated mercury levels in a declining population of ivory gulls in the Canadian Arctic. Marine Pollution Bulletin, 52(8), 978-982.

Evers, D. C., Savoy, L. J., DeSorbo, C. R., Yates, D. E., Hanson, W., Taylor, K. M., … & Munney, K. (2008). Adverse effects from environmental mercury loads on breeding common loons. Ecotoxicology, 17(2), 69-81.

Gilchrist, H. G., & Mallory, M. L. (2005). Declines in abundance and distribution of the ivory gull (Pagophila eburnea) in Arctic Canada. Biological Conservation, 121(2), 303-309.

Mallory, M. L., Gilchrist, H. G., Fontaine, A. J., & Akearok, J. A. (2003). Local ecological knowledge of ivory gull declines in Arctic Canada. Arctic, 293-298.

Thomas, V.G., MacDonald, S.D., 1987. The breeding distribution and
current population status of the ivory gull in Canada. Arctic 40,
211–218.

USGS. 2000. http://www.usgs.gov/themes/factsheet/146-00/

Humans and Wolves in the Yukon Flats, Alaska

For the last 2.5 years in fulfillment of my Masters in Wildlife Biology at the University of Alaska Fairbanks, I have been researching the biological and human component of two key moose hunters (wolves and humans) within the Yukon Flats. I am happy to say that the full thesis is is completed and that I will be graduating in December! In my eyes, a critical next step is to make the results of this work public. Hence, I will be dedicating four blog entries to the subject. This first installment will introduce  the biology of the region, study area, and my research questions. My next installment will examine access of subsistence hunters to moose within the region. Following that I will look at movement of wolves in the region, and I will conclude by looking at areas were the likelihood of competition between wolves and humans for moose is highest.

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I conducted my research on human hunters and wolves in the Yukon Flats, Alaska. The predator-prey relations in Yukon Flats are unique because wolves and subsistence users pursue low-density moose that are held at a low-density equilibrium from predation. In fact, moose are at some of the lowest densities in the world (<0.20 moose per square kilometer).

Broadly I was interested in:

  1. How do human hunters and wolves utilize their environment when pursuing moose?
  2. How does understanding space use and movement and of humans and wolves pursuing moose help us understand competition for a scarce resource they rely on?

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The Yukon Flats National Wildlife Refuge is located in central Alaska, and extends nearly 220 miles east to west and 120 miles north to south.  It falls directly into a the boreal forest, which means if you walk around that you’ll find birch, black spruce, white spruce, alder and willow. Its namesake is the Yukon River which bisects the Flats, and the huge watershed of the Yukon River is fed by a plethora of rivers. In short, it is a water dominated system.

Yukon Flats
The Yukon Flats National Wildlife Refuge is located north of Fairbanks. It extends nearly 220 miles from east to west and 120 miles north to south.

Yukon Flats

Within the Yukon Flats there are several communities that are defined by their reliance on the land to harvest food, fuel, and fiber. Their subsistence lifestyle provides up to 85% of the resources they use including but not limited to moose, fish, and waterfowl. Since moose are such low densities but are critical for humans and moose,  it is interesting to research how moose are pursued, and where the likelihood of competition between humans and wolves in the highest. Answering any of those questions pertinent for managers.  My thesis integrated spatially explicit (i.e., locations) datasets of moose (Alces alces) hunters and of wolves (Canis lupus) to ultimately evaluate how two predators pursue a common resource, moose.

To this end, Chapter 1 of my thesis will be the second installment on this blog and focus on quantifying rural hunter access in the Yukon Flats, Alaska, through spatially-linked interviews. I chose this research topic because previous studies have only qualitatively surmised use area for subsistence resources by drawing boundaries around use areas. However, a quantitative approach can yield firmer management information. My novel approach provided pertinent insight into resource use for our system and created a method that may be applied to other systems. Using results generated from subsistence hunter interviews, I applied a model of access to moose hunting areas. Harvest reporting is low among the subsistence communities in our study, and from our results we generated an estimate of harvest based on game densities similar to the best data available on reported harvest. As such, my method may provide an alternative to, or supplement, harvest-ticket reporting.

In Chapter 2, I characterized movement paths (i.e., hunt paths) between moose kills by six packs in the Yukon Flats. The results of that work will be the third installment on this blog. The movements of wolves have been studied and documented in many high prey-density systems, but almost no information exists on their movements when prey is just dense (<0.20 /km2) enough for wolves to survive.

Finally, I will tie what I learned about wolf movement and human access to examine where competition between humans is the most likely. At that time, I hope to provide a full copy of the thesis for comprehensive reading of the research. I look forward to sharing this information with you, please feel free to ask questions!

 

 

2016 Alaskan Calendar is Now for Sale!

Hello Everyone,

I am very, very, very  excited to write inform you of the release of my 2016 calendar! The content features some of the best imagery on this website, plus a few things that have never seen the “light of day”. The calendar is entitled “Seasonal Moods of Alaska” with imagery for each month captured in that month. The calendar is 100% designed by me including feature images, transparent images, windows, and text tying the imagery to the season. A huge thanks to my family and fiance for helping to proof the calendar! I believe the final product is a work of art mingled with science.

If you want to see it, clicking on the cover image or link link will bring you to the sales site that I created.  Otherwise, keep reading for some more information 🙂

2016 Seasons and Moods of Alaska Cover

http://ianajohnson.com/customproducts/

The calendar is printed on 9.5×13 paper and spiral bound leaving ample of room to write in your schedule. Of course it has a hole for hanging if that is all you want to do with it! With imagery from throughout Alaska, the calendar is a great memento of your trip to Alaska, for a friend who has been here, or to bring inspiration for your future trip here!

This calendar is being printed by my local shop in Perham, Minnesota. Your consideration and support also helping the local economy in Perham.

2016 Calendar Final 9halfx138
Each month has a premier image. This image from Mendenhall glacier showcases the high resolution imagery within the calendar.
2016 Calendar Final 9halfx1323
Every month has a transparent image behind the grid, and small windows with images from that month. Writing in the lower right panel ties together fuses the imagery and writing together.

The calendar will be available for pre-order through October 15th. At that time I will begin shipping orders. You can help me out a huge amount by spreading the word about this calendar or through a purchase! Thanks you so much in advance for your support in this project!

Watching a Glacier Die

Drop a few ice cubes in your drink before you start reading this, and consider the question : how many licks does it take to get to the center of a Tootsie Pop? Now, while you are thinking about that illusive answer, consider how many days it takes to melt a glacier. Just how fast does it happen? My several trips to Castner Glacier over the last 15 months provide interesting evidence into this impossible to answer question. Let’s take a look!

April 2014

When I first visited Castner Glacier in April 2014 a monstrous, multi-chambered ice cave shook me to my core. The ice cathedral hung over my head an estimated 80 feet above. The walls and ceilings of it were composed of blue, transluscent layers of ice and closer inspection of the walls showed that the clarity of the ice provided a window deep into the glacier of the sediment suspended in it. A chimney was cut into its ceiling allowing light to illuminate the icy floor of the glacier.  It was awe inspiring!

Castner Glacier Face April 2014
This was the glacial face (moraine) as I found it during my April 2014 visit. Clear, blue ice was found in the face, and particularly in the caves.
Castner Ice Cave Cathedral
Once you walked through the ice caves, this cathedral was found on the other side. I guess, based on my height in this picture compared to the ceilings, that the cave was 80 feet tall!
Castner Glacier Chimney
This chimney was found in the ceiling perhaps 20-30 feet above the glacier floor in April 2014. It was very narrow at the top, but the bottom is much wider than this picture would suggest. The icicles at its base suggest that some melting was occurring in it.

This video was taken in April 2014 during a walkthrough of the ice cave and captures the scope of it. Instability of parts of the video was due to the slippery ice floor!

August 2014

The next time I visited the rainiest summer recorded in Fairbanks was coming to a close, and the rain had reshaped the ice in unimaginable ways. Water ran down the glacier in small rivulets and opened the chimney to a yawning mouth. It degraded the ceiling so extremely, that large chunks of the cavern had crashed down. If you stood close to the mouth of the cave many rocks fell dangerously from the ceiling as they melted from their icy tomb of thousands of years. The rapid melt had removed the beautiful transparency from the ice. It was now silty and gray.

Castner Glacier Collapse
When we returned in August 2014 we found the result of the constant rain over the summer. The chimney had melted so rapidly that the roof of the ice cave had collapsed.
Castner Glacier Ice Cave Backside
This image shows the degradation of the chimneys from the top and back of the glacier. Although I didn’t take an April 2014 photo for comparison, this image is especially revealing when compared to June 2015 (upcoming images)
Castner Ice Cave Scale
My parents stand next to the ice cave’s face for perspective. The large blocks that stood in front in April were now gone, and the top of the cave is much, much thinner than just three months earlier. 
Castner Ice Cave Front 2015
This image from the front of the caves shows a large section of ice which caved off the front. The scale and setting of this picture is similar to the April 2014 image of me standing in front of the broad ice cave.

The rapid melting that we witnessed inspired me to create a different type of video for Castner. This video documents the fall (August) stage of plant life around the glacier, and then documents the progression of drops of water from the glacier which eventually build into the silty and fast-flowing Castner Creek.

June 2015

When I visited the Castner Ice Cave in June 2015, it was just a shadow of its former self. Only a small arch of ice remained of the once huge cave. Castner Creek ran through the remnant of the ice cave, where previously it had run to the side. In just fifteen months, unquantifiable amounts of ice from the glacier had transformed into water, carrying with it many tons of silt to the broader river valley that Castner Creek flowed into. The glacier was rapidly changing, dying.

Castner Ice Cave Back June 2015
This image of the Castner Ice Cave was shot in June 2015 from the back. The thin, collapsed chunk of ice in the foreground is all that remains of most of the ceiling of the cave.

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Castner Ice Cave Back Panorama
This image of the back of the Castner Ice Cave can be compared to the images taken in August 2014 and April 2014. The trailing edges of the large ice cathedral that I stood in can be seen in the back right. The arch of the glacier is thin, and a new chimney shows that it continues to degrade.
Castner Glacier Backside Panorama
The trailing edge of the ceiling on the right is all that is left of the ice cathedral from April 2014. Large piles of debris and silt have been deposited, and the floor where the cathedral was is much higher now.

The answer is two hundred fifty-two. At least that is what students at Purdue concluded to the center of a Tootsie Pop. But why does it matter that Alaska’s Castner Glacier and the state’s other glaciers are melting so rapidly? Alaska Dispatch News recently reported on a new study demonstrating that Alaskan Glaciers are losing 75 billion tons (75 gigatons) of ice each year, and that 94% of that loss is occurring on inland glaciers like Castner. This means that Alaskan glaciers will continue to contribute a significant amount to global sea level rise, especially in light of a warming climate. They end the article with a quote by study co-author O’Neel. “This is probably going to be a pretty tough year for a lot of the glaciers”, he stated. It appears he is right, and Castner’s included.