Learning from the land (Nunami iliharniq): Reflecting on relational accountability in land-based learning and cross-cultural research in Uqšuqtuuq (Gjoa Haven, Nunavut)

The land is where Inuit knowledge transfer has taken place for generations. Land-based programs for learning and healing have been increasingly initiated across Inuit Nunangat in support of Inuit knowledge transfer that was disrupted by colonial settlement policies and imposed governance systems. We worked with Elders in Uqšuqtuuq (Gjoa Haven, Nunavut) to develop a project to understand the connections between caribou and community well-being. They emphasized that Elder–youth land camps are the most effective means for Elders to share their knowledge, for youth to learn, and for researchers to engage in respectful research. We used the Qaggiq Model for Inuktut knowledge renewal as a guiding framework, and we followed the direction of a land camp planning committee to plan, facilitate, and follow-up on three land camps (2011–2013). The Qaggiq Model also outlines the Qaggiq Dialogue as a way of engaging in relational accountability according to Inuit context and values. In this paper, we reflect on the complexities of upholding relational accountability in cross-cultural research — as part of entering into a Qaggiq Dialogue — with particular emphasis on local leadership, ethics and safety, experiential learning, and continuity. Our intention is to help others evaluate the opportunities and limitations of land camps for their own community context and research questions. Inuit tama’nganituqaq ilihaivalau’mata nunamii’lutik. Ublumiuřuq Inuit nunaa’ni humituinnaq nunami ilihainahualiqpaktut nunamiinirmik, inuuhirmi’nik i&uaqhinahuaq&-utiglu qauřimanirmi’nik tunihinahuaq&utik nutaqqami’nut qablunaaqaliraluaqti’lugu Inuktut ilihattiaruiralua’mata. Qauřihaqtit taapkuat hanaqatiqaq&utik inutuqarnik Uqšuqtuurmiutarnik Nunavummi, nalunaiqhittiarahuaq&utik tuktut inuuhuqattiarutauni-ngi’nik, inutuqallu nunami katiqatigiiquři’lutik i&uarniqšaittuu’mat: inutuqarnut ta’na ilihaqtami’nik ilihaijuma’lutik, inuuhuktullu ilihattiatqiřaujungna’mataguuq, qauřihaqtillu ta’na qauřihattiatqijaujungna’mata atuutiqaqtunik inungnut. Atuqtut malik&utik qařginnguarmik pivaallirutaunahuaqtumik atuqtauvaktumik atu’magit, malik&utiglu katimařiralaat inuit pitquřai’nik, pingahuiqtiq&utik nunami katiqatigiingniqaralua’mata ukiut 2011-mit 2013-mut. Taamnalu qařginnguaq atuqtauvaktuq titiraqtauhimařuq nalunaiqhihima’mat iluani qanuq qapblunaat pittiarahuarniqšaujungnariakšaita qauřihaqti’lugit inuit pitquhiagut i&uatqiřauřumik. Tařvani titiraqtut unipkaaq&utik ilaagut atqunarnia’nik pittiarahuaq&utik ilitquhiqaqatigiinngiti’lugit – inuuqatigiigahuaq&utik qařgiqaqatigiiktutut ukunanik atuutikhaqarahuaq&utik hanařut: taamna qauřiharniq inungnit aulatau’luni, pittiarnirlu qanurinnginnirlu ihumagiřauřut, nunami ilihaq&utik, kajuhiinnarungnaqtumik aturahuaq&utik atuutiqaqtunik inungnut. Qauřihaqtit tařvani unipkaaqtut atuqtami’nik ikajurniqaqu’lugu ahiinut nunami ilihaqtittinahuaqtunut ima’natut hanalutik, atuutiqattiarnia’niglu atqunarnarnia’niglu ilaagut, ahiit na’miniq hanajumagutik nunami’ni qauřihaqrumagutik ima’natut pijungna’mata.

Optical design challenges of subnivean camera trapping under extreme Arctic conditions

Camera trapping is widely used in different ecological studies and is particularly important for remote locations and extreme environments. However, the application of camera traps in Arctic regions remains very limited. One of the challenges is the formation of hoar on the lens of cameras. In this article, we propose a solution to address this problem by changing the camera parameters and its position in order to optimize the camera trap for long-term subnivean deployment in the Canadian Arctic. Preliminary field tests show that this approach allows tracking lemmings in the frozen environment without natural light or external electrical power supply, where the direct observations are impossible for the most part of the year. We obtained the first videos of lemmings under the snow during the Arctic winter. Extending the observational network of the newly designed camera traps will help to better understand lemming population dynamics. The demonstrated approach is also promising for other polar applications.

Comparison of methods for revegetation of vehicle tracks in High Arctic tundra on Svalbard

Natural regeneration after anthropogenic disturbance is slow in the tundra biome, but assisted regeneration can help speed up the process. A tracked off-road vehicle damaged a High Arctic dwarf shrub heath in Svalbard in May 2009, drastically reducing vegetation cover, soil seed bank and incoming seed rain. We assisted regeneration the following year using six different revegetation treatments, and monitored their effects one month-, and one- and eight years after their application. By 2018, all treatments still had a lower vegetation cover and limited species composition than the undamaged reference vegetation. The fertiliser treatment was the most effective in restoring vegetation cover (71 % vegetation cover, of which 62 % were bryophytes and 38 % vascular plant species). Compared to the reference plots (98 % vegetation cover, of which 32 % were bryophytes and 66 % were vascular plant species), the composition of the disturbed vegetation was still far from regenerated to its original state nine years after the tracks were made. The slow regrowth demonstrated in this study underlines the importance of avoiding disturbance of fragile tundra, and of implementing and upholding regulations restricting or banning such disturbance.

Shading decreases and delays NDVI and flowering of prostrate arctic shrubs

Increases in shrub growth and canopy cover are well documented community responses to climate warming in the Arctic. An important consequence of larger deciduous shrubs is shading of prostrate plant species, many of which are important sources of nectar and berries. Here we present the impact of a shading experiment on two prostrate shrubs, Vaccinium vitis-idaea and Arctous alpina, in northern Alaska over two growing seasons. We implemented three levels of shading (no shade, 40% shade, and 80% shade) in dry heath and moist acidic tundra. Plots were monitored for soil moisture content, surface temperature, normalized difference vegetation index (NDVI), and flowering. Shading was shown to, on average, lower surface temperature (0.7 to 5.3 ˚C) and increase soil moisture content (0.5 to 5.6%) in both communities. Both species- and plot-level NDVI values were delayed in timing of peak values (7 to 13 days) and decreased at the highest shading. Flower abundance of both species was lower in shaded plots and peak flowering was delayed (3 to 8 days) compared to controls. Changes in timing may result in phenological mismatches and can impact other trophic levels in the Arctic as both the flowers and resulting berries are important food sources for animals.

Long-term effects of snowmelt timing and climate warming on phenology, growth and reproductive effort of arctic tundra plant species

Arctic regions are particularly affected by rapidly rising temperatures and altered snow regimes. Snowmelt timing depends on spring temperatures and winter snow accumulation. Scenarios for the Arctic include both decreases and increases in snow accumulation. Predictions of future snowmelt timing are thus difficult and experimental evidence for ecological consequences is scarce. In 1995, a long-term factorial experiment was set up in a High Arctic evergreen shrub heath community on Ellesmere Island, Canada. We investigated how snow removal, snow addition and passive warming affected phenology, growth and reproductive effort of the four common tundra plant species <i>Cassiope tetragona</i>, <i>Dryas integrifolia</i>, <i>Luzula arctica</i> and <i>Papaver radicatum</i>. Timing of flowering and seed maturation as well as flower production were more strongly influenced by the combined effects of snowmelt timing and warming in the two shrub species than in the two herbaceous species. Warming effects persisted over the course of the growing season and resulted in increased shrub growth. Moreover, the long-term trend of increasing growth in two species suggests that ambient warming promotes tundra plant growth. Our results confirm the importance of complex interactions between temperature and snowmelt timing in driving species-specific plant responses to climate change in the Arctic.

Polar bear (Ursus maritimus) use of the Cape Bathurst polynya and flaw lead

The Cape Bathurst polynya and flaw lead (CBP) are major, predictable habitat features with ≤15% ice cover in an otherwise ice-covered Beaufort Sea, and thought to provide hunting opportunities for polar bears (Ursus maritimus Phipps, 1774). We assessed 78 adult (female; with and without cubs) and subadult (male and female) polar bears’ use of the CBP from October – June, 2007–2014. The CBP was up to 725 km wide in autumn, ice-covered in winter, and <306 km wide in spring. Seventy-nine percent (n = 62) of the bears used the CBP (≥1 location <2.4 km, or one 4 h step length, from the CBP). Use was higher for solitary adult females and subadult males, which travelled faster with low turning angles along wider sections than females with offspring and subadult females. Bears were closest to the CBP during the spring hyperphagia season. While a wider CBP did not prevent crossing, bears primarily crossed from the coast towards pack ice at locations 53% narrower than areas not crossed. Bears might avoid crossing when it would require a long-distance swim. The CBP affects polar bear ecology by providing hunting habitat and a corridor that could increase prey encounters but may affect movement.

Initialization of Thermal Models in Cold and Warm Permafrost

Equilibrium modelling, also known as spin-up, is a technique for initializing a stable thermal regime in ground temperature models for permafrost regions. The results act as a baseline for subsequent transient analyses of ground temperature response to climate change or infrastructure. In practice, spin-up procedures are often loosely described or neglected, and the criteria by which a stable thermal regime is evaluated are rarely defined or presented explicitly. In this paper, model results show that no single criterion based on thresholds of inter-cycle temperature change can be used to identify a stable thermal regime in all spin-up scenarios. Results from simulations using a wide range of initialization temperatures and conditions show the number of spin-up cycles can range between 10 to 10,000, and a spin-up criterion as fine as 0.00001 ^oC/cycle is required to achieve a stable thermal regime suitable for deeper warm permafrost models. The implications of selected threshold criteria are examined in follow-up transient analyses and show that warm permafrost models can be highly sensitive to initial temperature profiles based on the criterion utilized. The results alert scientists and engineers to the importance of initialization on site-specific and regional permafrost models for transient ground temperature analyses.

Onset of autumn senescence in High Arctic plants shows similar patterns in natural and experimental snow depth gradients

Predicted changes in snow cover and temperature raise uncertainties about how the beginning and the end of the growing season will shift for Arctic plants. Snowmelt timing and temperature are known to affect the timing of bud burst, but their effects on autumn senescence are less clear. To address this, researchers have examined senescence under natural and experimental environmental gradients. However, these approaches address different aspects of plant responses and the extent to which they can be compared is poorly understood. In this study, we show that the effect of snowmelt timing on the timing of autumn senescence in High Arctic plants is the same between a natural and an experimental gradient in three out of four studied species. While the two approaches mostly produce comparable results, they give in combination greater insight into the phenological responses to predicted climate changes. We also showed that a short warming treatment in autumn delayed senescence by 3.5 days in D. octopetala, which is a 10 % extension of the growing season end for this species. Warming treatments have commonly been applied to the whole growing season, but here we show that even isolated autumn warming can be sufficient to affect plant senescence.

Can bryophyte groups increase functional resolution in tundra ecosystems?

The relative contribution of bryophytes to plant diversity, primary productivity, and ecosystem functioning increases towards colder climates. Bryophytes respond to environmental changes at the species level, but because bryophyte species are relatively difficult to identify, they are often lumped into one functional group. Consequently, bryophyte function remains poorly resolved. Here, we explore how higher resolution of bryophyte functional diversity can be encouraged and implemented in tundra ecological studies. We briefly review previous bryophyte functional classifications and the roles of bryophytes in tundra ecosystems and their susceptibility to environmental change. Based on shoot morphology and colony organization, we then propose twelve easily distinguishable bryophyte functional groups. To illustrate how bryophyte functional groups can help elucidate variation in bryophyte effects and responses, we compiled existing data on water holding capacity, a key bryophyte trait. Although plant functional groups, can mask potentially high inter- and intraspecific variability, we found better separation of bryophyte functional group means compared to previous grouping systems regarding water holding capacity. This suggests that our bryophyte functional groups truly represent variation in the functional roles of bryophytes in tundra ecosystems. Lastly, we provide recommendations to improve monitoring of bryophyte community changes in tundra study sites.

Long-term monitoring reveals topographical features and vegetation explain winter habitat use of an arctic rodent

The quality of wintering habitats, such as depth of snow cover, plays a key role in sustaining population dynamics of arctic lemmings. However, few studies so far investigated habitat use during the arctic winter. Here, we used a unique long-term time series to test whether lemmings are associated with topographical and vegetational habitat features for their wintering sites. We examined yearly numbers and distribution of 22,769 winter nests of the collared lemming Dicrostonyx groenlandicus (Traill, 1823) from an ongoing long-term research on Traill Island, Northeast Greenland, collected between 1989 and 2019, and correlated this information with data on dominant vegetation types, elevation and slope. We found that the number of lemming nests was highest in areas with a high proportion of Dryas heath, but was also correlated with other vegetation types, suggestingsome flexibility in resource use of wintering lemmings. Furthermore, lemmings showed a higher use for sloped terrain, probably as it enhances the formation of deep snow drifts which increases the insulative characteristics of the snowpack and protection from predators. With global warming, prime lemming winter habitats may become scarce through alteration of snow physical properties, potentially resulting in negative consequence for the whole community of terrestrial vertebrates.