Parks Canada has a legal mandate to maintain or improve the ecological integrity of each national park. For Kluane National Park and Reserve this means ensuring the continuing health of its ecosystems – glaciers, icefields and fresh water, alpine tundra, and forests. Ecological monitoring is tracking changes to ecosystem health over time.
Kluane Monitoring Framework
Park monitoring is not new: staff have counted Dall sheep since 1973, and moose since the 1980s. But in order to capture a fuller picture of ecological health, Kluane’s monitoring framework was created in 2008, following public meetings in Haines Junction and Burwash. It was revised in 2014
Each spring, when the ice melts from ponds in Kluane National Park and Reserve, staff put on their hip waders and head into the field to listen for the chorus of croaking frogs. Parks Canada monitors wood frogs (Tsʼäl in Southern Tutchone language) in Kluane by visiting the same 17 ponds each spring to listen for the mating call of male wood frogs.
Their characteristic croak tells us that frogs are present and to what extent. We also survey their egg masses and keep an eye out for these elusive frogs while at the ponds. If we consistently hear nothing at a pond where we used to hear calls, we know something is different. That’s why we also take water chemistry and environmental measurements to keep track of other potential sources of change.
Long term monitoring
Long-term monitoring of these durable yet sensitive amphibians gives us an indication of the overall health of freshwater ecosystems in Kluane. Since we started monitoring wood frogs in 2009, we’ve seen ponds dry up then come back. We’ve seen frog presence remain stable in some ponds while fluctuating in others. Continuing these surveys will certainly yield interesting observations and valuable information to help manage and protect Kluane’s freshwater ecosystems.
Kokanee salmon are found from California to Alaska. Kluane National Park and Reserve is Canada's only national park with a naturally occurring population of kokanee salmon. Kluane's kokanee complete their entire life cycle in the fresh waters of the Kathleen Lake ecosystem.
The park has been monitoring kokanee salmon as they return to spawn in Sockeye Creek for over forty years. Historically the number of spawners has average 3660 fish but in early 2000s the numbers dropped dramatically. Only 730 were counted in 2002 decreasing to an all-time low of 20 spawners in 2009.
To protect the remaining population, the park closed sport fishing of kokanee salmon in 2004. The area around the spawning grounds is designated a Zone 1, Special Preservation Area.
In 2004 the park began an extensive research and monitoring program to try to determine the cause of the decline. Preliminary work suggests variation in climate plays a large role. As research continues, more pieces of the kokanee salmon puzzle will emerge.
Ongoing monitoring includes:
- Measuring changes in stream flow, temperature and water chemistry in the spawning stream.
- Collecting weather and climate data.
- Measuring the population of kokanee’s predator, lake trout.
- Comparing angler surveys to understand fish harvests.
With the data from the last four years, it is clear that kokanee in the Kathleen system follow a boom and bust population cycle. After over a decade-long severe depression in population numbers, in both 2015 and 2016, we had incredible returns of around 5500 fish. We had been cautiously optimistic about the recovery but the last two years confirm the need for precautionary management. This year we counted only 379 spawners. This is now strong evidence that the population is in a bust-phase of its cycle and at higher risk of local extinction.
The ban on possession of kokanee remains for the recreational fishery and we continue to ask the cooperation of all anglers to not target kokanee. We continue to work on trying to tease out the driver behind the large fluctuations in this population.
Lake trout (Salvelinus namaycush), known as Mbet in Southern Tutchone, are an important link in the aquatic food chain of large lakes in Kluane National Park and Reserve. To monitor the health of lake trout populations and predict the impacts of climatic changes to these populations, Parks Canada conducts netting surveys, angler surveys, fish sample analysis and lake temperature monitoring. Although our monitoring has a long-term focus, we have already observed some interesting findings.
Since 2010, we have conducted netting surveys in 3 lakes (Kathleen, Mush and Bates). The method involves catching fish of different sizes and at different depths to get an index of the population size over time. The lake trout population on Kathleen Lake is currently considered healthy based on the fact that there has been no change in the amount of effort needed to catch fish.
It takes time for lake trout to grow in Kluane’s cold waters. Although age generally increases with length, this is not a hard and fast rule. For example, the oldest lake trout caught was 39 years old but had a fork length of only 396 mm, whereas the longest fish caught had a fork length of 845 mm and was 26 years old.
The most recent angler survey in the park was conducted for Kathleen Lake in 2015. We look at many things when doing these surveys to get a good idea of the impacts of angling on fish populations. One interesting point of note was the lack of concern that anglers had towards invasive aquatic species – 30% of respondents were unconcerned or neutral about the threat of invasive species. This is especially concerning considering 38% of anglers came from outside the Yukon, some as far away as Lake Superior or the southern U.S. We need to raise awareness on invasive aquatic species.
Parks Canada staff have been collecting monthly water samples from the Dezadeash River since 1993. This is part of a long partnership with the Water Quality Monitoring Network of Environment and Climate Change Canada.
Water quality index
Water quality is assessed using the Canadian Council of Ministers of the Environment Water Quality Index for the protection of aquatic life. Water quality for the Dezadeash River has remained in a state of good ecological integrity with a stable trend.
“We are seeing glacier changes that shouldn’t be observable on human timescales.”
Glaciers and large icefields cover almost 80% of Kluane National Park and Reserve. In the last 50 years, the area glaciated has decreased by 20% and over 230 small glaciers have disappeared due to climate change. Understanding the dynamics behind this change and the resulting impacts to the Park is a large challenge. Parks Canada relies on the work of independent researchers to further our understanding.
Since 1981 Parks Canada has monitored two moose populations in the Park with helicopter surveys in November. The moose population in the Auriol ranges in the south portion of the Park is doing well.
In contrast, the moose population in the Duke River watershed is doing poorly. Why? Maybe the moose moved elsewhere? Research was needed. A 2011 survey by Parks Canada, the Yukon Government and the Kluane First Nation confirmed that moose numbers were low both inside and outside the park.
The partners, along with the local communities, are currently discussing strategies for increasing moose in the region. Working together is key to ensuring ecological health.
We can learn a lot about the overall health of Kluane's forests from our songbirds. Parks Canada has been monitoring breeding songbirds on the Auriol Trail since 2009.
Early birds gets the worm!
Each bird survey starts early in the morning, before 4 am, in June and identifies songbirds heard or seen at 12 different locations along the trail. We use special omni-directional microphones as shown in the photo to record birds at each site. That way we can re-listen to bird songs in the office to confirm our identification of species.
Wildfires were a key natural disturbance in the boreal forest in Kluane National Park and Reserve whether ignited by lightning strikes or by First Nations to modify habitat. Mean fire intervals ranged from ~200 years in the south portion of the Park to 400 to 500 years in the north.
Since policies of fire suppression began around 1950, only 380 hectares through 19 small fires have burned in the Park. If wildfires were to burn as they did historically, approximately 107, 275 ha should have burned in the last 160 years. Only about 31,000 ha have actually burned, representing a 72% deficit in the Park overall. Thus, the rating of poor ecological condition due to the lack of recent fires in the Park.
Management actions to date have been at a small scale. This includes Fire Smart programs (fuel reductions) at the Kathleen Lake Campground and around the Dezadeash River Trail.
Forest composition and structure
An outbreak of spruce bark beetle caused unprecedented levels of mortality of white spruce in southwest Yukon and Alaska from 1995 to the mid-2000s. Most of the spruce - dominated forest (82%) in Kluane National Park and Reserve was affected (49,000 ha). Within the attacked forest, on average almost half of the mature spruce trees were killed (44%). In order to understand the resilience of the forest to this novel disturbance, Parks Canada set up 50 permanent sample plots to monitor every 10 years.
Is the forest in Kluane National Park and Reserve becoming more dominated by deciduous trees like trembling aspen in the overstory? What about in the understory?
Since the spruce bark beetle outbreak, the relative dominance of deciduous trees in the overstory has significantly increased in the southern but not the northern area of the Park. There is significantly more willow than tall regenerating spruce which could inhibit tree regeneration in the understory.
As of 2015, the forest remained spruce dominated with a deciduous component within the range of natural variability.
Will the structure of the forests recover to similar conditions prior to the spruce bark beetle outbreak?
Parks Canada is monitoring the number of live spruce trees both mature and regenerating and as well as the volume of downed dead wood. As of 2015, the forest currently does not have not enough live trees in the canopy, nor in tree regeneration in the understory relative to conditions prior to the beetle outbreak. We are paying particular attention to the health of regenerating trees as we found widespread damage by snowshoe hares feeding on spruce seedlings.
Dall’s sheep are found in mountain ranges from northern British Columbia to Alaska. They are an iconic Kluane species and highly valued by Kluane First Nation and Champagne and Aishihik First Nations. Along with mountain goats, they are considered one of the bellweather species of climate change in alpine ecosystems. Across their range, Dall’s sheep have declined by 21% triggering concern that they be indicators of broad-scale change in northern alpine ecosystems.
To determine the health of the population in the Park over time, Parks Canada has conducted helicopter surveys of Dall’s sheep in four different mountain ranges since 1977. Two populations are considered healthy, within historical thresholds. However, the Vulcan subpopulation is consider in fair condition and the Auriol is in poor condition. The overall assessment of Dall’s sheep in the Park as of 2017 is fair and stable. Spring and fall temperatures have been found to influence lamb recruitment.
Parks Canada is working with Yukon Government Highways and Environment Department and Kluane First Nation to reduce collisions between Dall’s sheep and vehicles on the Alaska Highway. Please slow down around Thachäl Dhäl (Sheep Mountain).
Approximately 600 adult mountain goats are found in Kluane National Park and Reserve - almost 40% of the entire population in Yukon. Along with Dall’s sheep, they are considered one of the bellweather species of climate change in alpine ecosystems.
To determine the health of the population over time, Parks Canada has conducted helicopter surveys of mountain goats around Goatherd Mountain since 1977. The number of mountain goats counted is affected by the temperature on the day of the survey. Once temperature is accounted for, there is no significant trend in either adult goats or kid counts. This population is considered healthy as of the last survey in 2018.
To monitor change in alpine vegetation, Parks Canada has established permanent monitoring plots in seven different alpine area.
At each, we are measuring the length of the growing season using dataloggers which record levels of sunlight and temperature on the hour. This will be used to validate satellite derived indices of growing season across the landscape.
We are also measuring plant diversity, the height of shrub cover and permafrost. These plots were first set up in 2011 and the resulting stories of change will take some time to tell.