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Trevor Lantz
School of Environmental Studies, University of Victoria, David Turpin Building, Victoria, BC V8W 2Y2, Canada

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Journal article
Published: 01 July 2021 in Sustainability
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Monitoring methods based on Indigenous knowledge have the potential to contribute to our understanding of large watersheds. Research in large, complex, and dynamic ecosystems suggests a participatory approach to monitoring—that builds on the diverse knowledges, practices, and beliefs of local people—can yield more meaningful outcomes than a “one-size-fits-all” approach. Here we share the results of 12 community-based, participatory monitoring projects led by Indigenous governments and organizations in the Mackenzie River Basin (2015–2018). Specifically, we present and compare the indicators and monitoring methods developed by each of these community-based cases to demonstrate the specificity of place, culture, and context. A scalar analysis of these results suggests that the combination of core (common) indicators used across the basin, coupled with others that are meaningful at local level, create a methodological bricolage—a mix of tools, methods, and rules-in-use that are fit together. Our findings, along with those of sister projects in two other major watersheds (Amazon, Mekong), confront assumptions that Indigenous-led community-based monitoring efforts are too local to offer insights about large-scale systems. In summary, a networked approach to community-based monitoring that can simultaneously engage with local- and watershed-level questions of social and ecological change can address gaps in knowledge. Such an approach can create both practices and outcomes that are useful to local peoples as well as to those engaged in basin-wide governance.

ACS Style

Brenda Parlee; Henry Huntington; Fikret Berkes; Trevor Lantz; Leon Andrew; Joseph Tsannie; Cleo Reece; Corinne Porter; Vera Nicholson; Sharon Peter; Deb Simmons; Herman Michell; Melody Lepine; Bruce Maclean; Kevin Ahkimnachie; Lauren King; Art Napoleon; Joella Hogan; Jen Lam; Kristin Hynes; J.D. Storr; Sarah Lord; Mike Low; Jeanette Lockhart; Diane Giroux; Mike Tollis; Lana Lowe; Elaine Maloney; Tracy Howlett. One-Size Does Not Fit All—A Networked Approach to Community-Based Monitoring in Large River Basins. Sustainability 2021, 13, 7400 .

AMA Style

Brenda Parlee, Henry Huntington, Fikret Berkes, Trevor Lantz, Leon Andrew, Joseph Tsannie, Cleo Reece, Corinne Porter, Vera Nicholson, Sharon Peter, Deb Simmons, Herman Michell, Melody Lepine, Bruce Maclean, Kevin Ahkimnachie, Lauren King, Art Napoleon, Joella Hogan, Jen Lam, Kristin Hynes, J.D. Storr, Sarah Lord, Mike Low, Jeanette Lockhart, Diane Giroux, Mike Tollis, Lana Lowe, Elaine Maloney, Tracy Howlett. One-Size Does Not Fit All—A Networked Approach to Community-Based Monitoring in Large River Basins. Sustainability. 2021; 13 (13):7400.

Chicago/Turabian Style

Brenda Parlee; Henry Huntington; Fikret Berkes; Trevor Lantz; Leon Andrew; Joseph Tsannie; Cleo Reece; Corinne Porter; Vera Nicholson; Sharon Peter; Deb Simmons; Herman Michell; Melody Lepine; Bruce Maclean; Kevin Ahkimnachie; Lauren King; Art Napoleon; Joella Hogan; Jen Lam; Kristin Hynes; J.D. Storr; Sarah Lord; Mike Low; Jeanette Lockhart; Diane Giroux; Mike Tollis; Lana Lowe; Elaine Maloney; Tracy Howlett. 2021. "One-Size Does Not Fit All—A Networked Approach to Community-Based Monitoring in Large River Basins." Sustainability 13, no. 13: 7400.

Journal article
Published: 07 March 2021 in Remote Sensing of Environment
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Rapid climate warming has widely been considered as the main driver of recent increases in Arctic tundra productivity. Field observations and remote sensing both show that tundra “greening” has been widespread, but heterogeneity in regional and landscape-scale trends suggest that additional controls are mediating the response of tundra vegetation to warming. In this study, we examined the relationship between changes in vegetation productivity in the western Canadian Arctic and biophysical variables by analyzing trends in the Enhanced Vegetation Index (EVI) obtained from nonparametric regression of annual Landsat surface reflectance composites. We used Random Forests classification and regression tree modelling to predict the trajectory and magnitude of greening from 1984 to 2016 and identify biophysical controls. More than two-thirds of our study area showed statistically significant increases in vegetation productivity, but observed changes were heterogeneous, occurring most rapidly within areas of the Southern Arctic that were: (1) dominated by dwarf and upright shrub cover types, (2) moderately sloping, and (3) located at lower elevation. These findings suggest that the response of tundra vegetation to warming is mediated by regional- and landscape-scale variation in microclimate, topography and soil moisture, and physiological differences among plant functional groups. Our work highlights the potential of the joint analysis of annual remotely sensed vegetation indices and broad-scale biophysical data to understand spatial variation in tundra vegetation change.

ACS Style

Angel Chen; Trevor C. Lantz; Txomin Hermosilla; Michael A. Wulder. Biophysical controls of increased tundra productivity in the western Canadian Arctic. Remote Sensing of Environment 2021, 258, 112358 .

AMA Style

Angel Chen, Trevor C. Lantz, Txomin Hermosilla, Michael A. Wulder. Biophysical controls of increased tundra productivity in the western Canadian Arctic. Remote Sensing of Environment. 2021; 258 ():112358.

Chicago/Turabian Style

Angel Chen; Trevor C. Lantz; Txomin Hermosilla; Michael A. Wulder. 2021. "Biophysical controls of increased tundra productivity in the western Canadian Arctic." Remote Sensing of Environment 258, no. : 112358.

Article
Published: 27 July 2020 in Ecosphere
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The distribution and composition of Arctic vegetation are expected to shift with ongoing climate change. Global models generally predict northward shifts in high‐latitude ecotones, and analysis of remote sensing data shows widespread greening and changes in vegetation structure across the circumpolar Arctic. However, there are still uncertainties related to the timing of these shifts and variation among different plant functional types. In this paper, we investigate disequilibrium dynamics of green alder and white spruce in the Tuktoyaktuk Coastal Plain, NWT. We used high‐resolution air photographs captured in the 1970s and 2000s to quantify changes in the distribution and abundance of alder and spruce near their northern limits. We found increases in alder and spruce stem density over time, but no change in their range limits, indicating that both species are affected by leading‐edge disequilibrium. Low stand density and temperature limitation of reproduction along the northern margin likely contributed to observed disequilibrium in both species. We also observed the greatest change in species occupancy within a burned area, suggesting that the increased frequency of fire will play a significant role in the timing and magnitude of near‐term vegetation change.

ACS Style

Hana Z. Travers‐Smith; Trevor C. Lantz. Leading‐edge disequilibrium in alder and spruce populations across the forest–tundra ecotone. Ecosphere 2020, 11, 1 .

AMA Style

Hana Z. Travers‐Smith, Trevor C. Lantz. Leading‐edge disequilibrium in alder and spruce populations across the forest–tundra ecotone. Ecosphere. 2020; 11 (7):1.

Chicago/Turabian Style

Hana Z. Travers‐Smith; Trevor C. Lantz. 2020. "Leading‐edge disequilibrium in alder and spruce populations across the forest–tundra ecotone." Ecosphere 11, no. 7: 1.

Journal article
Published: 08 June 2020 in Sustainability
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Environmental changes are impacting northern environments and human communities. Cumulative impact assessments are vital to understanding the combined effects of regional industrial developments and natural disturbances that affect humans and ecosystems. A gap in cumulative impacts literature includes methods to evaluate impacts in cultural landscapes. In this study, we utilized spatial overlay analysis to assess cumulative environmental impacts in the cultural landscape of northern Canada’s Gwich’in Settlement Region. In three analyses, we quantified and mapped: (1) Cultural feature density, (2) cumulative environmental disturbance, and (3) potential overlap between disturbances and cultural features. Our first analysis depicts the extent and pattern of cultural relationships with regional landscapes and illustrates the Gwich’in cultural landscape, with widespread harvesting trails, named places, traditional use areas, and archaeological sites found in highest densities near important waterways. Our second analysis suggests that spatial overlay can track multiple disturbances, illustrating diffuse, lower intensity cumulative environmental impacts. The final analysis shows that overlaying disturbance and cultural feature data provides a novel way to investigate cumulative impacts in a cultural landscape, indicating relatively low levels of potential overlap between Gwich’in cultural features and disturbances. These methods provide one way to investigate cumulative impacts, relevant for well- documented cultural landscapes.

ACS Style

Tracey Proverbs; Trevor Lantz; Gwich’in Tribal Council Department of Cultural Heritage. Cumulative Environmental Impacts in the Gwich’in Cultural Landscape. Sustainability 2020, 12, 4667 .

AMA Style

Tracey Proverbs, Trevor Lantz, Gwich’in Tribal Council Department of Cultural Heritage. Cumulative Environmental Impacts in the Gwich’in Cultural Landscape. Sustainability. 2020; 12 (11):4667.

Chicago/Turabian Style

Tracey Proverbs; Trevor Lantz; Gwich’in Tribal Council Department of Cultural Heritage. 2020. "Cumulative Environmental Impacts in the Gwich’in Cultural Landscape." Sustainability 12, no. 11: 4667.

Journal article
Published: 01 June 2020 in Arctic Science
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Climate change is altering Canada’s western Arctic, including hydrology in the heterogeneous environment of the Mackenzie Delta, and these changes are impacting biotic communities. Muskrats are culturally important semi-aquatic rodents whose populations may respond to changing water levels in this region. We investigated the importance of patch configuration and patch composition — two properties affected by climate change — on muskrat presence and distribution in the Mackenzie Delta, using remote sensing and field-based surveys of lakes with and without muskrats. We tested multiple hypotheses about predictors of muskrat and forage biomass presence using a model-selection approach. We found that configuration and patch composition explained muskrat distribution in the Mackenzie Delta, with composition being of greater importance. Muskrats were more likely to occur in lakes with longer perimeters, higher amounts of forage biomass, and sediment characteristics that supported macrophyte growth. The latter two conditions are related to spring flooding regimes, which will likely be altered by climate change. This may result in a decrease in muskrat habitat in the Mackenzie Delta. Our research indicates that both patch composition and configuration are important for understanding species distributions in heterogeneous environments.

ACS Style

Chanda K. Turner; Trevor C. Lantz; Jason T. Fisher. Muskrat distributions in a changing Arctic delta are explained by patch composition and configuration. Arctic Science 2020, 6, 77 -94.

AMA Style

Chanda K. Turner, Trevor C. Lantz, Jason T. Fisher. Muskrat distributions in a changing Arctic delta are explained by patch composition and configuration. Arctic Science. 2020; 6 (2):77-94.

Chicago/Turabian Style

Chanda K. Turner; Trevor C. Lantz; Jason T. Fisher. 2020. "Muskrat distributions in a changing Arctic delta are explained by patch composition and configuration." Arctic Science 6, no. 2: 77-94.

Articles
Published: 03 March 2020 in Coastal Management
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The intensification of coastal storms, combined with declining sea ice cover, sea level rise, and changes to permafrost conditions, will likely increase the incidence and impact of storm surge flooding in Arctic coastal environments. In coastal communities accurate information on the exposure of infrastructure can make an important contribution to adaptation planning. In this study, we use high resolution elevation data from airborne LiDAR to generate storm flooding scenarios for three coastal communities (Utqiaġvik, Wainwright, and Kaktovik) in northern Alaska. To estimate the potential for damage to infrastructure caused by flooding for each community, we generated data on replacement costs and used it to estimate the financial impact of 24 storm flooding scenarios of varying intensities. This analysis shows that all three communities are exposed to storm surges, but highlights the fact that infrastructure in Utqiaġvik (the administrative center of the North Slope Borough) is significantly more exposed than buildings in Wainwright and Kaktovik. Our findings show that flooding scenarios can complement information gained from past events and help to inform local-decision making.

ACS Style

Trevor C. Lantz; Nina D. Moffat; Benjamin Jones; Qi Chen; Craig E. Tweedie. Mapping Exposure to Flooding in Three Coastal Communities on the North Slope of Alaska Using Airborne LiDAR. Coastal Management 2020, 48, 96 -117.

AMA Style

Trevor C. Lantz, Nina D. Moffat, Benjamin Jones, Qi Chen, Craig E. Tweedie. Mapping Exposure to Flooding in Three Coastal Communities on the North Slope of Alaska Using Airborne LiDAR. Coastal Management. 2020; 48 (2):96-117.

Chicago/Turabian Style

Trevor C. Lantz; Nina D. Moffat; Benjamin Jones; Qi Chen; Craig E. Tweedie. 2020. "Mapping Exposure to Flooding in Three Coastal Communities on the North Slope of Alaska Using Airborne LiDAR." Coastal Management 48, no. 2: 96-117.

Review
Published: 01 January 2020 in Ecology and Society
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Thompson, K.-L., T. Lantz, and N. C. Ban. 2020. A review of Indigenous knowledge and participation in environmental monitoring. Ecology and Society 25(2):10. https://doi.org/10.5751/ES-11503-250210

ACS Style

Kim-Ly Thompson; Trevor C. Lantz; Natalie C. Ban. A review of Indigenous knowledge and participation in environmental monitoring. Ecology and Society 2020, 25, 1 .

AMA Style

Kim-Ly Thompson, Trevor C. Lantz, Natalie C. Ban. A review of Indigenous knowledge and participation in environmental monitoring. Ecology and Society. 2020; 25 (2):1.

Chicago/Turabian Style

Kim-Ly Thompson; Trevor C. Lantz; Natalie C. Ban. 2020. "A review of Indigenous knowledge and participation in environmental monitoring." Ecology and Society 25, no. 2: 1.

Journal article
Published: 27 November 2018 in Remote Sensing
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Rapid increases in air temperature in Arctic and subarctic regions are driving significant changes to surface waters. These changes and their impacts are not well understood in sensitive high-Arctic ecosystems. This study explores changes in surface water in the high Arctic pond complexes of western Banks Island, Northwest Territories. Landsat imagery (1985–2015) was used to detect sub-pixel trends in surface water. Comparison of higher resolution aerial photographs (1958) and satellite imagery (2014) quantified changes in the size and distribution of waterbodies. Field sampling investigated factors contributing to the observed changes. The impact of expanding lesser snow goose populations and other biotic or abiotic factors on observed changes in surface water were also investigated using an information theoretic model selection approach. Our analyses show that the pond complexes of western Banks Island lost 7.9% of the surface water that existed in 1985. Drying disproportionately impacted smaller sized waterbodies, indicating that climate is the main driver. Model selection showed that intensive occupation by lesser snow geese was associated with more extensive drying and draining of waterbodies and suggests this intensive habitat use may reduce the resilience of pond complexes to climate warming. Changes in surface water are likely altering permafrost, vegetation, and the utility of these areas for animals and local land-users, and should be investigated further.

ACS Style

T. Kiyo F. Campbell; Trevor C. Lantz; Robert H. Fraser. Impacts of Climate Change and Intensive Lesser Snow Goose (Chen caerulescens caerulescens) Activity on Surface Water in High Arctic Pond Complexes. Remote Sensing 2018, 10, 1892 .

AMA Style

T. Kiyo F. Campbell, Trevor C. Lantz, Robert H. Fraser. Impacts of Climate Change and Intensive Lesser Snow Goose (Chen caerulescens caerulescens) Activity on Surface Water in High Arctic Pond Complexes. Remote Sensing. 2018; 10 (12):1892.

Chicago/Turabian Style

T. Kiyo F. Campbell; Trevor C. Lantz; Robert H. Fraser. 2018. "Impacts of Climate Change and Intensive Lesser Snow Goose (Chen caerulescens caerulescens) Activity on Surface Water in High Arctic Pond Complexes." Remote Sensing 10, no. 12: 1892.

Article
Published: 16 August 2018 in Human Ecology
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Global socioeconomic and ecological changes strongly impact Indigenous communities by affecting food security, physical health, and overall wellbeing. Throughout the 1900s, residents of the Mackenzie Delta in Canada’s western Arctic relied heavily on the muskrat (Ondatra zibethicus) for food, fur, and culture, but recent changes to ecological and economic conditions have altered the nature of this relationship. We investigated the role of muskrats in the cultural traditions and land-based livelihoods of the Gwich’in and Inuvialuit residents of the Mackenzie Delta through interviews and meetings with over 70 community members. Although the role of muskrats has changed over the last 100 years, muskrat harvesting continues to offer Delta residents a meaningful way to remain engaged in, perpetuate, and strengthen their cultural identity and land-based traditions among generations, and ultimately, to foster individual and community wellbeing.

ACS Style

C. K. Turner; Gwich’in Tribal Council Department of Cultural Heritage; T. C. Lantz. Springtime in the Delta: the Socio-Cultural Importance of Muskrats to Gwich’in and Inuvialuit Trappers through Periods of Ecological and Socioeconomic Change. Human Ecology 2018, 46, 601 -611.

AMA Style

C. K. Turner, Gwich’in Tribal Council Department of Cultural Heritage, T. C. Lantz. Springtime in the Delta: the Socio-Cultural Importance of Muskrats to Gwich’in and Inuvialuit Trappers through Periods of Ecological and Socioeconomic Change. Human Ecology. 2018; 46 (4):601-611.

Chicago/Turabian Style

C. K. Turner; Gwich’in Tribal Council Department of Cultural Heritage; T. C. Lantz. 2018. "Springtime in the Delta: the Socio-Cultural Importance of Muskrats to Gwich’in and Inuvialuit Trappers through Periods of Ecological and Socioeconomic Change." Human Ecology 46, no. 4: 601-611.

Journal article
Published: 15 June 2018 in Remote Sensing
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Ice-wedge networks underlie polygonal terrain and comprise the most widespread form of massive ground ice in continuous permafrost. Here, we show that climate-driven thaw of hilltop ice-wedge networks is rapidly transforming uplands across Banks Island in the Canadian Arctic Archipelago. Change detection using high-resolution WorldView images and historical air photos, coupled with 32-year Landsat reflectance trends, indicate broad-scale increases in ponding from ice-wedge thaw on hilltops, which has significantly affected at least 1500 km2 of Banks Island and over 3.5% of the total upland area. Trajectories of change associated with this upland ice-wedge thermokarst include increased micro-relief, development of high-centred polygons, and, in areas of poor drainage, ponding and potential initiation of thaw lakes. Millennia of cooling climate have favoured ice-wedge growth, and an absence of ecosystem disturbance combined with surface denudation by solifluction has produced high Arctic uplands and slopes underlain by ice-wedge networks truncated at the permafrost table. The thin veneer of thermally-conductive mineral soils strongly links Arctic upland active-layer responses to summer warming. For these reasons, widespread and intense ice-wedge thermokarst on Arctic hilltops and slopes contrast more muted responses to warming reported in low and subarctic environments. Increasing field evidence of thermokarst highlights the inherent climate sensitivity of the Arctic permafrost terrain and the need for integrated approaches to monitor change and investigate the cascade of environmental consequences.

ACS Style

Robert H. Fraser; Steven V. Kokelj; Trevor C. Lantz; Morgan McFarlane-Winchester; Ian Olthof; Denis Lacelle. Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island. Remote Sensing 2018, 10, 954 .

AMA Style

Robert H. Fraser, Steven V. Kokelj, Trevor C. Lantz, Morgan McFarlane-Winchester, Ian Olthof, Denis Lacelle. Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island. Remote Sensing. 2018; 10 (6):954.

Chicago/Turabian Style

Robert H. Fraser; Steven V. Kokelj; Trevor C. Lantz; Morgan McFarlane-Winchester; Ian Olthof; Denis Lacelle. 2018. "Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island." Remote Sensing 10, no. 6: 954.

Journal article
Published: 11 January 2018 in Journal of Biogeography
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To quantify changes in vegetation productivity over the past three decades across five barren ground caribou (Rangifer tarandus groenlandicus) herd ranges and assess how these changes are influencing caribou movement rates. Northwest Territories and Nunavut, Canada. As an indicator of vegetation productivity, the enhanced vegetation index (EVI) was calculated on newly developed cloud-free, gap-free, Landsat surface reflectance image composites representing 1984–2012. Changes in EVI were assessed on a pixel basis using Theil-Sen's nonparametric regression and compared across herd ranges and land cover types using generalized least squares regression. Animal movement velocity was calculated from caribou telemetry data and generalized additive mixed models were used to link movement rates with vegetation productivity during the post-calving phase of the year (July and August). Vegetation productivity increased across the five caribou herd ranges examined. The largest productivity increase occurred over the ranges of the most western herds, with the largest observed changes in grassland or shrub habitats. Caribou tended to move more slowly through tundra habitats with elevated levels of productivity to a point, while grasslands movement rates decreased linearly with increasing productivity. Movement velocities peaked at intermediate productivity levels in shrub habitats. Over the three decades of collected data, barren ground caribou habitats have become more productive, which is consistent with other studies that have documented increases in Arctic vegetation productivity. The more western herds, whose ranges are also closest to the Arctic Ocean, experienced the largest increases in productivity. Finally, we demonstrate that barren ground caribou movement patterns will likely change as a result of changing vegetation productivity in complex manners depending on herd, habitat type and the magnitude of change in vegetation productivity.

ACS Style

Gregory J. M. Rickbeil; Txomin Hermosilla; Nicholas C. Coops; Joanne C. White; Michael A. Wulder; Trevor C. Lantz. Changing northern vegetation conditions are influencing barren ground caribou (Rangifer tarandus groenlandicus ) post-calving movement rates. Journal of Biogeography 2018, 45, 702 -712.

AMA Style

Gregory J. M. Rickbeil, Txomin Hermosilla, Nicholas C. Coops, Joanne C. White, Michael A. Wulder, Trevor C. Lantz. Changing northern vegetation conditions are influencing barren ground caribou (Rangifer tarandus groenlandicus ) post-calving movement rates. Journal of Biogeography. 2018; 45 (3):702-712.

Chicago/Turabian Style

Gregory J. M. Rickbeil; Txomin Hermosilla; Nicholas C. Coops; Joanne C. White; Michael A. Wulder; Trevor C. Lantz. 2018. "Changing northern vegetation conditions are influencing barren ground caribou (Rangifer tarandus groenlandicus ) post-calving movement rates." Journal of Biogeography 45, no. 3: 702-712.

Physical geography and environmental sciences
Published: 11 May 2017 in Annals of the American Association of Geographers
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The productivity and phenology of vegetation are spatially and temporally variable ecosystem functions. Monitoring spatial–temporal patterns in these functions can improve our understanding of global change and natural ecosystem variability and inform management actions. Researchers typically focus on temporal changes within or among static regions and omit dynamics of spatial configuration. Our goal was to assess global spatial–temporal variability in productivity and phenology regimes between 2000 and 2012 using a temporally dynamic functional type classification. Fourteen functional types were defined for each year by clustering the annual sum and annual variability (seasonality) of the fraction of photosynthetically active radiation (fPAR)—a biophysical proxy for vegetation greenness or productivity—from the Moderate Resolution Imaging Spectrometer (MODIS). The fourteen functional types ranged from tundra (low cumulative fPAR and highly seasonal) to tropical forests (high cumulative fPAR and low seasonality). Variability in the mean of the fPAR metrics and in two spatial pattern metrics was assessed for each functional type. Many pixels changed from one cluster to another then back again, suggesting considerable short-term variability. Temporal variability in the mean of the fPAR metrics was relatively low, with changes instead primarily manifested in spatial pattern. Spatial pattern was most variable within tundra, grasslands, shrublands, and savannas. A dynamic classification demonstrated the variability in spatial patterns of primary productivity and can be used for future monitoring.

ACS Style

Shanley D. Thompson; Trisalyn A. Nelson; Nicholas C. Coops; Michael A. Wulder; Trevor C. Lantz. Global Spatial–Temporal Variability in Terrestrial Productivity and Phenology Regimes between 2000 and 2012. Annals of the American Association of Geographers 2017, 107, 1519 -1537.

AMA Style

Shanley D. Thompson, Trisalyn A. Nelson, Nicholas C. Coops, Michael A. Wulder, Trevor C. Lantz. Global Spatial–Temporal Variability in Terrestrial Productivity and Phenology Regimes between 2000 and 2012. Annals of the American Association of Geographers. 2017; 107 (6):1519-1537.

Chicago/Turabian Style

Shanley D. Thompson; Trisalyn A. Nelson; Nicholas C. Coops; Michael A. Wulder; Trevor C. Lantz. 2017. "Global Spatial–Temporal Variability in Terrestrial Productivity and Phenology Regimes between 2000 and 2012." Annals of the American Association of Geographers 107, no. 6: 1519-1537.

Journal article
Published: 01 May 2017 in Arctic, Antarctic, and Alpine Research
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ACS Style

Emily A. Cameron; Trevor C. Lantz. Persistent Changes to Ecosystems following Winter Road Construction and Abandonment in an Area of Discontinuous Permafrost, Nahanni National Park Reserve, Northwest Territories, Canada. Arctic, Antarctic, and Alpine Research 2017, 49, 259 -276.

AMA Style

Emily A. Cameron, Trevor C. Lantz. Persistent Changes to Ecosystems following Winter Road Construction and Abandonment in an Area of Discontinuous Permafrost, Nahanni National Park Reserve, Northwest Territories, Canada. Arctic, Antarctic, and Alpine Research. 2017; 49 (2):259-276.

Chicago/Turabian Style

Emily A. Cameron; Trevor C. Lantz. 2017. "Persistent Changes to Ecosystems following Winter Road Construction and Abandonment in an Area of Discontinuous Permafrost, Nahanni National Park Reserve, Northwest Territories, Canada." Arctic, Antarctic, and Alpine Research 49, no. 2: 259-276.

Journal article
Published: 07 February 2017 in Geology
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ACS Style

Steven V. Kokelj; Trevor C. Lantz; Jon Tunnicliffe; Rebecca Segal; Denis Lacelle. Climate-driven thaw of permafrost preserved glacial landscapes, northwestern Canada. Geology 2017, 45, 371 -374.

AMA Style

Steven V. Kokelj, Trevor C. Lantz, Jon Tunnicliffe, Rebecca Segal, Denis Lacelle. Climate-driven thaw of permafrost preserved glacial landscapes, northwestern Canada. Geology. 2017; 45 (4):371-374.

Chicago/Turabian Style

Steven V. Kokelj; Trevor C. Lantz; Jon Tunnicliffe; Rebecca Segal; Denis Lacelle. 2017. "Climate-driven thaw of permafrost preserved glacial landscapes, northwestern Canada." Geology 45, no. 4: 371-374.

Journal article
Published: 01 September 2016 in Arctic Science
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Plot-scale field measurements are necessary to monitor changes to tundra vegetation, which has a small stature and high spatial heterogeneity, while satellite remote sensing can be used to track coarser changes over larger regions. In this study, we explored the potential of unmanned aerial vehicle (UAV) photographic surveys to map low-Arctic vegetation at an intermediate scale. A multicopter was used to capture highly overlapping, subcentimetre photographs over a 2 ha site near Tuktoyaktuk, Northwest Territories. Images were processed into ultradense 3D point clouds and 1 cm resolution orthomosaics and vegetation height models using Structure-from-Motion (SfM) methods. Shrub vegetation heights measured on the ground were accurately represented using SfM point cloud data (r2 = 0.96, SE = 8 cm, n = 31) and a combination of spectral and height predictor variables yielded an 11-class classification with 82% overall accuracy. Differencing repeat UAV surveys before and after manually trimming shrub patches showed that vegetation height decreases in trimmed areas (− 6.5 cm, SD = 21 cm). Based on these findings, we conclude that UAV photogrammetry provides a promising, cost-efficient method for high-resolution mapping and monitoring of tundra vegetation that can be used to bridge the gap between plot and satellite remote sensing measurements.

ACS Style

Robert H. Fraser; Ian Olthof; Trevor C. Lantz; Carla Schmitt. UAV photogrammetry for mapping vegetation in the low-Arctic. Arctic Science 2016, 2, 79 -102.

AMA Style

Robert H. Fraser, Ian Olthof, Trevor C. Lantz, Carla Schmitt. UAV photogrammetry for mapping vegetation in the low-Arctic. Arctic Science. 2016; 2 (3):79-102.

Chicago/Turabian Style

Robert H. Fraser; Ian Olthof; Trevor C. Lantz; Carla Schmitt. 2016. "UAV photogrammetry for mapping vegetation in the low-Arctic." Arctic Science 2, no. 3: 79-102.

Journal article
Published: 01 August 2016 in Arctic, Antarctic, and Alpine Research
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ACS Style

Nina D. Moffat; Trevor C. Lantz; Robert H. Fraser; Ian Olthof. Recent Vegetation Change (1980–2013) in the Tundra Ecosystems of the Tuktoyaktuk Coastlands, NWT, Canada. Arctic, Antarctic, and Alpine Research 2016, 48, 581 -597.

AMA Style

Nina D. Moffat, Trevor C. Lantz, Robert H. Fraser, Ian Olthof. Recent Vegetation Change (1980–2013) in the Tundra Ecosystems of the Tuktoyaktuk Coastlands, NWT, Canada. Arctic, Antarctic, and Alpine Research. 2016; 48 (3):581-597.

Chicago/Turabian Style

Nina D. Moffat; Trevor C. Lantz; Robert H. Fraser; Ian Olthof. 2016. "Recent Vegetation Change (1980–2013) in the Tundra Ecosystems of the Tuktoyaktuk Coastlands, NWT, Canada." Arctic, Antarctic, and Alpine Research 48, no. 3: 581-597.

Letter
Published: 01 April 2016 in Environmental Research Letters
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Arctic ecosystems are undergoing rapid changes as a result of climate warming and more frequent disturbances. Disturbances can have particularly large effects on high-latitude ecosystems when ecosystem structure and function is controlled by strong feedbacks between soil conditions, vegetation, and ground thermal regime. In this study we investigated the impact of road construction and maintenance on vegetation structure and biomass along the Dempster Highway where it crosses the Peel Plateau in the Northwest Territories. To explore drivers of tall shrub proliferation and to quantify shrub proliferation in this region of continuous permafrost, greyscale air photos (1975) and Quickbird satellite imagery (2008) were used to map landcover change within two 0.6 km2 belts next to the road and two 0.6 km2 belts 500 m away from the road. Maps showing areas where: 1) tall shrubs expanded, and 2) dwarf shrub tundra resisted invasion were then used to select field sites where a suite of biophysical variables were measured. Rapid tall shrub proliferation and greater biomass adjacent to the road indicate that disturbance can facilitate vegetation change in tundra environments. Our field data also suggests that increased shrub proliferation adjacent to the road was caused by greater soil moisture. Tall shrub proliferation adjacent to the road occurred at lower elevation sites characterized by wetter soils with thicker organic layers. Areas that resisted tall shrub encroachment were located at higher elevations and had drier soils with thin organic layers. Our observations also support previous work illustrating that tall shrub expansion next to the highway promotes strong positive feedbacks to ongoing shrub growth and proliferation.

ACS Style

Emily A Cameron; Trevor C Lantz. Drivers of tall shrub proliferation adjacent to the Dempster Highway, Northwest Territories, Canada. Environmental Research Letters 2016, 11, 45006 .

AMA Style

Emily A Cameron, Trevor C Lantz. Drivers of tall shrub proliferation adjacent to the Dempster Highway, Northwest Territories, Canada. Environmental Research Letters. 2016; 11 (4):45006.

Chicago/Turabian Style

Emily A Cameron; Trevor C Lantz. 2016. "Drivers of tall shrub proliferation adjacent to the Dempster Highway, Northwest Territories, Canada." Environmental Research Letters 11, no. 4: 45006.

Letter
Published: 01 March 2016 in Environmental Research Letters
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Climate change is increasing the frequency and intensity of thermokarst, but the influences of regional climate and physiography remain poorly understood. Retrogressive thaw slumping is one of the most dynamic forms of thermokarst and affects many areas of glaciated terrain across northwestern Canada. In this study, we used airphotos and satellite imagery to investigate the influence of climate and landscape factors on thaw slump dynamics. We assessed slump size, density, and growth rates in four regions of ice-rich terrain with contrasting climate and physiographic conditions: the Jesse Moraine, the Tuktoyaktuk Coastlands, the Bluenose Moraine, and the Peel Plateau. Observed increases in: (1) the area impacted by slumps (+2 to +407%), (2) average slump sizes (+0.31 to +1.82 ha), and (3) slump growth rates (+169 to +465 m2 yr−1) showed that thermokarst activity is rapidly accelerating in ice-rich morainal landscapes in the western Canadian Arctic, where slumping has become a dominant driver of geomorphic change. Differences in slump characteristics among regions indicate that slump development is strongly influenced by topography, ground ice conditions, and Quaternary history. Observed increases in slump activity occurred in conjunction with increases in air temperature and precipitation, but variation in slump activity among the four regions suggests that increased precipitation has been an important driver of change. Our observation that the most rapid intensification of slump activity occurred in the coldest environment (the Jesse Moraine on Banks Island) indicates that ice-cored landscapes in cold permafrost environments are highly vulnerable to climate change.

ACS Style

Rebecca Segal; Trevor C Lantz; Steven V Kokelj. Acceleration of thaw slump activity in glaciated landscapes of the Western Canadian Arctic. Environmental Research Letters 2016, 11, 034025 .

AMA Style

Rebecca Segal, Trevor C Lantz, Steven V Kokelj. Acceleration of thaw slump activity in glaciated landscapes of the Western Canadian Arctic. Environmental Research Letters. 2016; 11 (3):034025.

Chicago/Turabian Style

Rebecca Segal; Trevor C Lantz; Steven V Kokelj. 2016. "Acceleration of thaw slump activity in glaciated landscapes of the Western Canadian Arctic." Environmental Research Letters 11, no. 3: 034025.

Journal article
Published: 06 January 2016 in Permafrost and Periglacial Processes
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High-centred polygonal terrain is a widespread feature of Arctic landscapes that is sensitive to increasing ground temperatures because of its high ground-ice content. Understanding spatial variation in the distribution and sensitivity of high-centred polygonal terrain is important for predicting landscape change. In the Tuktoyaktuk Coastlands, Northwest Territories, Canada, mean annual ground temperatures in permafrost have increased between 1 and 2°C over the last 40 years and high-centred polygonal terrain comprises about 10 per cent of the terrestrial landscape. To investigate factors affecting the distribution and potential degradation of ice wedges, we mapped high-centred polygonal terrain and ice-wedge melt ponds, and documented ice wedge related thermokarst at anthropogenic disturbances using 2004 aerial photographs. Historical melt pond distribution was assessed using 1972 aerial photographs. The density of polygonal terrain (up to 37%) was significantly higher in the northern than the southern part of the study area, where more abundant lacustrine sediments and lower ground temperatures have favoured ice-wedge development. Larger proportional melt pond area (0.68%), increases in pond area (up to 3.74%) and a higher frequency of major thermokarst activity following anthropogenic surface disturbance (54%) suggest that high-centred polygonal terrain in the northern part of the study area is more susceptible to degradation than in the southern part. Copyright © 2016 John Wiley & Sons, Ltd.

ACS Style

Audrey Elizabeth Steedman; Trevor C. Lantz; Steven V. Kokelj. Spatio-Temporal Variation in High-Centre Polygons and Ice-Wedge Melt Ponds, Tuktoyaktuk Coastlands, Northwest Territories. Permafrost and Periglacial Processes 2016, 28, 66 -78.

AMA Style

Audrey Elizabeth Steedman, Trevor C. Lantz, Steven V. Kokelj. Spatio-Temporal Variation in High-Centre Polygons and Ice-Wedge Melt Ponds, Tuktoyaktuk Coastlands, Northwest Territories. Permafrost and Periglacial Processes. 2016; 28 (1):66-78.

Chicago/Turabian Style

Audrey Elizabeth Steedman; Trevor C. Lantz; Steven V. Kokelj. 2016. "Spatio-Temporal Variation in High-Centre Polygons and Ice-Wedge Melt Ponds, Tuktoyaktuk Coastlands, Northwest Territories." Permafrost and Periglacial Processes 28, no. 1: 66-78.

Journal article
Published: 24 March 2015 in Journal of Geophysical Research: Biogeosciences
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Growing evidence indicates that lake‐dominated ecosystems at high latitudes are undergoing significant hydrological changes. Research examining these changes is complicated because both thermokarst and climatic processes likely influence lake dynamics. To examine the relative impacts of these processes in permafrost landscapes, we investigated the dynamics of lake area and number in Old Crow Flats (OCF), Yukon using historical air photos and satellite imagery. Between 1951 and 2007, OCF experienced a decline of ~6000 ha in total lake area but gained 232 lakes. Close to half (49%) of the difference in lake area was driven by the rapid and persistent drainage of 38 large lakes. These catastrophic drainages were associated with new or enlarged outlet channels, resulted in the formation of numerous residual ponds, and were likely driven by thermokarst processes. Our analysis shows that catastrophic lake drainages have become more than 5 times more frequent in recent decades. These changes are likely related to the impacts of increased temperature and precipitation on thermokarst processes. Fifty‐nine of the 170 intensively studied lakes showed either large bidirectional fluctuations or gradual cumulative declines. These changes affected a much smaller portion of OCF and were likely driven by interactions between increased precipitation and temperature and individual catchment characteristics. To anticipate landscape‐scale changes in these systems, and assess their impact on hydrology, wildlife habitat, and carbon storage, field research is required to better characterize the mechanisms responsible for changes.

ACS Style

T. C. Lantz; K. W. Turner. Changes in lake area in response to thermokarst processes and climate in Old Crow Flats, Yukon. Journal of Geophysical Research: Biogeosciences 2015, 120, 513 -524.

AMA Style

T. C. Lantz, K. W. Turner. Changes in lake area in response to thermokarst processes and climate in Old Crow Flats, Yukon. Journal of Geophysical Research: Biogeosciences. 2015; 120 (3):513-524.

Chicago/Turabian Style

T. C. Lantz; K. W. Turner. 2015. "Changes in lake area in response to thermokarst processes and climate in Old Crow Flats, Yukon." Journal of Geophysical Research: Biogeosciences 120, no. 3: 513-524.