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Showing 1 to 14 of 14 for “"Canadian High Arctic"”.
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Limnological and paleolimnological investigations of environmental change in three distinct ecosystem types, Canadian High Arctic
… biological remains preserved in the sediments of Arctic lakes and ponds in the Canadian High Arctic are important indicators of environmental change, especially as long-term instrumental data are often lacking. Although recent studies have underscored variability amongst these aquatic ecosystems, …
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Population ecology of landlocked Arctic charr, <i>Salvelinus alpinus L</i>., in the Canadian High Arctic
… activities. Four landlocked populations of Arctic charr, <i>Salvelinus alpinus</i> L., were surveyed at 81 oN, close to the northerly extreme of the species range. They were single-species populations consisting of two distinct size modes, "Dwarf" and "Normal" charr, but with major …
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Heterotrophic Microbial Colonization of the Interior of Shocked Rocks from the Haughton Impact Structure, Devon Island, Nunavut, Canadian High Arctic
… inhabiting porous sedimentary rocks in Antarctica. Here we examine a novel environment for endolithic communities: crystalline rocks that have undergone shock metamorphosis as a result of a comet or asteroid impact. Specifically, we present a characterization of the heterotrophic endolithic …
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Studies of Atmospheric Ozone and Related Constituents in the Arctic and at Mid-latitudes
… Atmospheric Research Laboratory (PEARL) in the Canadian High Arctic (80.1o N, 86.4o W). These two instruments have been used to measure stratospheric trace gases since 1999 and 2006 respectively. In 2010 and 2014, two solar-tracking systems were integrated with the GBSs to make tropospheric …
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Spatio-Temporal Variation in Ringed Seal (Pusa Hispida) Density and Habitat Use in the Last Ice Area
The Arctic is experiencing warming at a rate approximately four times faster than the global average, contributing to precipitous declines in the extent, thickness, age, and seasonal duration of sea ice. The full effects of these rapid changes in sea ice habitat on the Arctic marine ecosystem …
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The resilience of Polar Collembola to climate change
… genetic diversity of Collembola from the central Canadian High Arctic location of Cambridge Bay (Ikaluktuktiak) was undertaken to refine species identifications, examine levels of population diversity, and explore the role of geological processes and glacial dynamics in shaping the current Arctic …
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Multifrequency Scintillation in the Polar Caps
… Electromagnetic Radio Tomography (CERTO) and the Canadian High Arctic Ionospheric Network (CHAIN) are two different networks of scintillation receivers, each with a station in Resolute Bay, Canada. CERTO measures amplitude and phase signals in VHF and UHF while CHAIN measures amplitude and phase …
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Characterization of Impact Melt Rocks and Hydrothermal Mineralization at the Haughton Impact Structure, Devon Island, Canada: An Investigation of Impacts into Carbonate Targets
… produced. The Haughton impact structure in the Canadian High Arctic was formed in the Paleozoic Arctic Platform which overlies Precambrian metamorphic rocks. In order to better understand impactite formation and hydrothermal mineralization in impacts into calcareous targets, this study conducts …
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Paleoenvironment reconstruction in extreme climates using organic geochemical investigations
… was much warmer than today. In addition to this higher background temperature a series of rapid warming events occurred termed hyperthermals. The largest of these, the Paleocene-Eocene Thermal Maximum is perhaps the best analog to modern day anthropogenic climate change. It is paramount to …
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Microbiology of the sulfur-dominated glacial ecosystem at Borup Fiord Pass, and high Arctic low-temperature spring associated microbial mats, The
… Pass (BFP) located on Ellesmere Island in the Canadian High Arctic is a unique low-temperature environment. BFP is a sulfur-dominated ecosystem that occurs within the Krieger mountains. Here, a subglacial spring emergences from the toe of a coalescence glacier. The presence of high …
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Microbiology of the sulfur-dominated glacial ecosystem at Borup Fiord Pass, and high Arctic low-temperature spring associated microbial mats, The
… Pass (BFP) located on Ellesmere Island in the Canadian High Arctic is a unique low-temperature environment. BFP is a sulfur-dominated ecosystem that occurs within the Krieger mountains. Here, a subglacial spring emergences from the toe of a coalescence glacier. The presence of high …
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Investigating dissolved organic matter cycling in High Arctic ponds and soils
… lability has been investigated extensively in Arctic lake and large river systems, however relatively little research has investigated the lability of DOM in systems with more fine scale spatial heterogeneity in environmental conditions, such as ponds and soils. Chapter 2 presents a study of …